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Interface nanocrystalline reinforcement mechanism of particle interlayer in pulsed current assisted rolling Mg/Al laminate 认领 引用 被引量：1
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作者 Peng Li Xiaobao Ma +3 位作者 Yongheng Peng Zhongkai Ren Peng Chen Tao Wang 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2026年第3期464-482,共19页
Interface transition zone and the interface influence zone are critical factors in determining the interfacial bonding strength and ductility of heterogeneous metallic laminates.In this study,an innovative process—“... Interface transition zone and the interface influence zone are critical factors in determining the interfacial bonding strength and ductility of heterogeneous metallic laminates.In this study,an innovative process—“cold spraying+pulsed current rolling”—is proposed for fabricating Mg/Al laminates,significantly enhancing both interface strength and ductility.Notably,the average interface shear strength achieved is three times that of conventional hot rolling,reaching 70.7 MPa,while the interface shear strain increases from 3.4%to 28%.The high-velocity impact of cold-sprayed aluminum particles on Mg and Al substrates forms a three-dimensional interface,effectively expanding the interfacial bonding area and refining the interfacial microstructure.The fine-grained coating structure produced by cold spraying acts as a primer,facilitating the formation of a nanocrystalline interface during pulsed current assisted rolling.The interface comprises an ultrafine nanocrystalline Al coating with grain sizes around 30 nm andβ-phase nanotwins approximately 300 nm in scale,significantly enhancing the interfacial bonding strength.Together with the Mg and Al substrates,the nanocrystalline transition layer forms a layered gradient transitional structure that evolves into a 50-μm-wide interface-affected zone during deformation.This unique feature promotes strain delocalization,effectively mitigates strain concentration at the interface,and improves its fracture toughness.Additionally,the nanocrystalline interface increases the grain boundary area,promoting atomic diffusion and strengthening metallurgical bonding both between the coating and the substrate and within the coating itself.The“cold spraying+pulsed current rolling”process offers a straightforward approach to fabricating laminated nanostructured transition layers,demonstrating great potential in the interfacial design of heterogeneous materials. 展开更多
关键词 Nanocrystalline transition layer Pulsed current assisted rolling Cold spraying Magnesium/aluminium laminates Strain delocalization
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Development of a cost-effective Fe-P-C nanocrystalline alloy with high magnetic induction and ductility via annealing-free melt-spinning 认领 引用
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作者 Jing Ding Cong Liu +5 位作者 Zhao-can Li Wen-chao Liu Xiao-long Wang Ji-li Tian Shu-qiang Lü Sheng-li Zhu 《China Foundry》 SCIE EI CAS CSCD 2026年第2期169-178,共10页
A cost-effective Fe-P-C nanocrystalline alloy(Fe85P_9C_6)was developed via melt-spinning by eliminating expensive alloying elements and post-annealing steps.The microstructure consists of an amorphous matrix with u... A cost-effective Fe-P-C nanocrystalline alloy(Fe85P_9C_6)was developed via melt-spinning by eliminating expensive alloying elements and post-annealing steps.The microstructure consists of an amorphous matrix with uniformly dispersed nanocrystalline clusters,featuring an average size of approximately 5 nm.This dual-phase structure remains thermally stable up to 569 K and results in excellent magnetic and mechanical performance,including a high saturation magnetic induction of 1.69 T,Vickers hardness of 621 HV,and outstanding bending ductility.Crystallization proceeds via the transformation of a metastable fcc-(Fe,P,C)phase intoα-Fe,Fe3C,and Fe3P,driven by internal stress arising from atomic size mismatch.Continuous heating and cooling transformation diagrams further reveal that this process can be precisely controlled to optimize phase evolution.The high Fe content and stress-relaxed nanocrystalline clusters contribute to enhanced in-plane magnetic anisotropy and rapid domain response.This simplified,annealing-free approach not only reduces material and processing costs but also provides a viable pathway for scalable fabrication of next-generation soft magnetic alloys with superior performance and manufacturability. 展开更多
关键词 amorphous nanocrystalline saturation magnetic induction ductility
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Multiscale modeling of grain boundary-mediated plastic strain recovery in nanocrystalline metals 认领 引用
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作者 Ben Fang Tao Fang +4 位作者 Xiaoqiang Wang Zhongliang Yu Wenqing Zhu Chaonan Cong Xiaoding Wei 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第4期639-648,共10页
We propose a new mechanistic framework to unveil the fundamental mechanisms governing multi-cycle plastic strain recovery in nanocrystalline metals.The model uniquely integrates crystal plasticity in nanograins with g... We propose a new mechanistic framework to unveil the fundamental mechanisms governing multi-cycle plastic strain recovery in nanocrystalline metals.The model uniquely integrates crystal plasticity in nanograins with grain boundary(GB)chemo-mechanics,explicitly resolving atomic flux driven by chemical potential gradients under evolving stress and free volume distributions.Applied to nanocrystalline copper films,our simulations capture transient(10-7 s-1)and steady-state(10-8 s-1)strain recovery rates spanning hours to days,achieving quantitative agreement with experimental kinetics across six orders of time scale.Three key advances emerge:(1)GB-mediated atomic diffusion dominates recovery(contributing>75%of total strain reversal),while dislocation back-stress in nanograins plays a secondary role;(2)recovery cycles induce microstructural evolution through stress-driven free volume redistribution,generating chaotic GB stress states and localized plasticity accumulation at triple junctions;(3)macroscopic strain recovery masks progressive microplasticity in GB networks,revealing a fatigue precursor mechanism inaccessible to conventional models.This work establishes the first predictive link between atomic-scale GB dynamics and macroscopic time-dependent recovery,providing a transformative tool for designing fatigue-resistant nanocrystalline alloys through GB engineering. 展开更多
关键词 Nanocrystalline metals Plastic strain recovery Grain boundary mechanisms Crystal plasticity Chemical potential gradient
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Effect of Heterogenous Gradient Structure Induced by High Cu Content on Nanocrystallization Process and Magnetic Properties of Fe-Based Nanocrystalline Alloys 认领 引用
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作者 Lei Xie Qiang Li +4 位作者 Jing Zhou Yaqiang Dong Aina He Chuntao Chang Baoan Sun 《Rare Metals》 SCIE EI CAS CSCD 2026年第4期744-755,共12页
The pre-existingα-Fe crystals have important effects on the precipitation and growth of nanocrystals and finally determine the comprehensive soft magnetic properties(SMPs)of the nanocrystalline alloys(NAs).In this wo... The pre-existingα-Fe crystals have important effects on the precipitation and growth of nanocrystals and finally determine the comprehensive soft magnetic properties(SMPs)of the nanocrystalline alloys(NAs).In this work,a high content of Cu elements has been added to Nanomet-type alloys to enhance the gradient heterogeneity in order to well control the nanocrystalline process of amorphous alloys.Crystallization kinetics reveal that α-Fe crystals in the free-side layer exhibit higher nucleation and growth activation energies,leading to a slower crystallization rate than in the wheel-side layer.This inhomogeneous crystallization behavior reduces the uneven distribution of α-Fe crystals in the as-spun high Cu content ribbons.Consequently,the Fe82.5Si3.5B9P2C1Cu1.7 alloy achieves superior SMPs through nanocrystallization,including high Bs(~1.82 T),low Hc(10,000@1 kHz)across wide TA and tA ranges.Compared to low-temperature long-time and lowtemperature short-time heat treatments,high-temperature short-time heat treatment results in better SMPs.This is because it intensifies the competition between the fast nucleation/growth of newα-Fe crystals and the slower growth of pre-existing crystals.These findings deepen the understanding of crystallization processes in gradient inhomogeneous materials and guide the optimization of annealing processes for improved performance in Fe-based NAs. 展开更多
关键词 gradient microstructure magnetic property nanocrystalline alloy non‑uniform crystallization mechanism
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Manufacturing novel Fe-based nanocrystalline powders with high saturation magnetization and low core loss by gas atomization 认领 引用
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作者 Yanqiu Li Ling Zhang +4 位作者 Xingjie Jia Yaqiang Dong Aina He Jiawei Li Baogen Shen 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2026年第1期182-189,共8页
Fe-based nanocrystalline powders are ideal soft magnetic materials for matching the wide bandgap semiconductors.Previously developed Fe-based nanocrystalline alloys are difficult to produce high-quality precursor powd... Fe-based nanocrystalline powders are ideal soft magnetic materials for matching the wide bandgap semiconductors.Previously developed Fe-based nanocrystalline alloys are difficult to produce high-quality precursor powder by gas atomization due to their poor amorphous forming ability,and their following nanocrystallizations also require high temperatures or heating rates.In present work,we invented novel high-performance Fe-based nanocrystalline powders that can be directly manufactured by gas atomization without annealing.The as-atomized Fe73.3Si12B13Cu1.7nanocrystalline powders exhibit fine α-Fe(Si)crystals with an average size of 15.1 nm and high saturation magnetization(Ms)of 156.2 emu/g.The Fe73.3Si12B13Cu1.7soft magnetic powder cores annealed at 480℃for 60 min process high effective permeability of 35.9 and low core losses(50 mT/100 kHz)of 310.1 mW/cm3.These outstanding magnetic properties and good processability make the developed Fe73.3Si12B13Cu1.7nanocrystalline powders highly promising for high-performance inductors and transformers. 展开更多
关键词 Fe-based nanocrystalline alloys High Cu content Gas atomization Saturation magnetization Core loss
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High-Coercivity Nd2Fe14B/α-Fe Nanocomposites With Ultrafine Nanocrystalline Structure via Zr-Induced Synchronous Precipitation 认领 引用
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作者 Xiaowei Zhang Jun Li +4 位作者 Chang Liu Renquan Wang Hongfu Liu Xiaotao Bao Ying Liu 《Rare Metals》 SCIE EI CAS CSCD 2026年第2期446-458,共13页
Nanocomposite permanent magnets with reduced rare-earth content represent a promising class of materials for next-generation high-performance applications.However,asynchronous precipitation of soft and hard magnetic p... Nanocomposite permanent magnets with reduced rare-earth content represent a promising class of materials for next-generation high-performance applications.However,asynchronous precipitation of soft and hard magnetic phases often results in grain size mismatch and limited coercivity.In this study,zirconium is utilized to modulate the eutectic reaction temperature among the soft magnetic,hard magnetic,and boron-rich phases,aligning it with the solidification point of the hard phase.This thermal alignment enables synchronous precipitation,leading to the formation of ultrafine dual-phase nanocomposites with an average grain size of approximately 20 nm and a 75.8% improvement in coercivity.Furthermore,zirconium addition induces the formation of a ferromagnetic ZrFe2 three-dimensional network that encapsulates both soft and hard magnetic grains,significantly enhancing intergranular exchange coupling and magnetization uniformity.The synergistic effects of grain refinement and phase compatibility result in the concurrent enhancement of coercivity and energy product,while substantially lowering rare-earth consumption.These findings offer a practical strategy for grain size synchronization and phase integration in multiphase nanocomposites. 展开更多
关键词 coercivity Nd2Fe14B/α-Fe nanocomposite synchronous nucleation ultrafine nanocrystalline ZrFe2phase
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Oxidation behavior of nanocrystalline Pt-γ′coating with embedded Al2O3 nanoparticles at 1050℃ 认领 引用
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作者 Yuzhuo Li Peng Zhang +4 位作者 Yingfei Yang Shengfeng Zhou Pan Ren Qiwei Wang Wei Li 《Corrosion Communications》 EI CSCD 2026年第2期101-111,共11页
Nanocrystalline Pt-γ′coatings(NC Pt-γ′)with embedded Al2O3 nanoparticles were fabricated on single-crystal superalloy through reactive magnetron sputtering to explore oxidation behavior of NC Pt-γ′at 1050... Nanocrystalline Pt-γ′coatings(NC Pt-γ′)with embedded Al2O3 nanoparticles were fabricated on single-crystal superalloy through reactive magnetron sputtering to explore oxidation behavior of NC Pt-γ′at 1050℃.Results indicate that Al2O3 scale was formed on surface of the coarse-grain structured Pt-γ′coating.However,as oxidation time is prolonged,Al content in the coating decreases,and a multi-layered oxide scale is formed on the surface.In contrast,NC Pt-γ′coating exhibits high oxidation resistance due to a large number of boundaries provided by nanocrystalline structure,which facilitates rapid diffusion of Al.In addition,nano Al2O3 particles were precipitated in the coating due to mild addition of O into the coating.The nanoparticles distributed at grain boundaries of the coating can inhibit the growth of grains at high temperature. 展开更多
关键词 Oxidation Pt modification Nanocrystalline coating High temperature
Mechanisms of grain refinement and improved kinetic property of nanocrystalline Mg-Ni-La hydrogen storage alloys prepared by nanocrystallization of amorphous 认领 引用 被引量：6
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作者 Y.M.Li Z.C.Liu +6 位作者 X.Dong Y.P.Ji C.J.Shi G.F.Zhang Y.Z.Li J.Kennedy F.Yang 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2025年第3期1364-1381,共18页
Mgx(Ni0.8La0.2)100-x,where x=60,70,80,exhibiting a nanocrystalline microstructure,were prepared through the crystallization of amorphous alloys.The investigation encompassed the phase constitution,grain si... Mgx(Ni0.8La0.2)100-x,where x=60,70,80,exhibiting a nanocrystalline microstructure,were prepared through the crystallization of amorphous alloys.The investigation encompassed the phase constitution,grain size,microstructural stability,and hydrogen storage properties.Crystallization kinetics,along with in-situ high-energy XRD characterization,revealed a concentrated and synchronous crystallization of Mg2Ni and RE-Mg-Ni ternary phases with the increase in La and Ni content.The attributed synchronous crystallization process was found to be a result of the close local affinity of Mg2Ni and RE-Mg-Ni ternary phases,as assessed by the thermodynamic Miedema model.Significant secondary phase pinning effect,arising from the high likelihood of well-matching phase structures between Mg2Ni,LaMg2Ni,and LaMgNi4,was validated through both the edge-to-edge matching model prediction and experimental observation.Thefine and homogeneous microstructure was shown to be a consequence of fast crystallization kinetics and the secondary phase pinning effect.Improved activation performance and cycling stability were observed,stemming from grain refinement and excellent microstructural stability.Our study provides insights into mechanism of grain refinement of nanocrystalline microstructure tailored by phase constitution and crystallization kinetics in the amorphous-crystallization route.We also demonstrate the potential of material design guided by phase equilibria and crystallographic predictions to improve nanocrystalline with excellent microstructural stability. 展开更多
关键词 Hydrogen storage Mg based alloys Crystallization Nanocrystalline Amorphous alloy
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Obtaining extremely low coercivity of high Bs FeCoBSiCPCu nanocrystalline alloys through modulation of magnetic anisotropy 认领 引用 被引量：7
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作者 Mingjuan Cai Zhijun Guo +5 位作者 Lei Li Xingyu Zheng Xiaoxuan Yang Qianqian Liu Gaopeng Zou Baolong Shen 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第4期105-112,共8页
Longitudinal magnetic field annealing is utilized for modifying the magnetic anisotropy and enhancing the magnetic softness of Fe75Co8(B10Si3C3P1)1-x/17Cux(x=0.5,0.75,1,1.25)nanocrystalline all... Longitudinal magnetic field annealing is utilized for modifying the magnetic anisotropy and enhancing the magnetic softness of Fe75Co8(B10Si3C3P1)1-x/17Cux(x=0.5,0.75,1,1.25)nanocrystalline alloys.All of the magnetic field-annealed nanocrystalline alloys with Cu content more than 0.5 at.%exhibit significantly improved soft-magnetic properties,including high saturation magnetic flux density up to 1.87 T,effective permeability of 13,000-16,000 under the condition of 1 A/m and 1 kHz,coercivity as low as 1.6 A/m,and core loss of 0.11-0.45 W/kg under the condition of 1.0 T and 50 Hz.The application of a magnetic field promotes the nucleation and inhibits the growth of grains,leading to an increase in the number density of nanocrystals and the crystalline volume fraction,and a reduction in the grain size.The magnetic field annealing reduces the effective magneto-crystalline anisotropy energy to 2-4 J/m3,and induces longitudinal magnetic anisotropy with anisotropy energy density of 400-900 J/m3which shows dependence on the crystalline volume fraction.The field-induced magnetic anisotropy dominates over the random local magnetic anisotropies,and results in the formation of regular magnetic domains aligned longitudinally,pinning-free domain wall displacement,and thus enhanced soft-magnetic properties. 展开更多
关键词 Nanocrystalline alloy Magnetic anisotropy Magnetic field annealing Soft-magnetic property Microstructure
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Microalloying and pre-annealing co-modulation of the nanocrystalline structure and soft magnetic properties of Fe(Co)SiBPCu alloys 认领 引用 被引量：2
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作者 Shu-Jie Kang Zhe Chen +3 位作者 Qian-Ke Zhu Ke-Wei Zhang Zhan-Hu Guo Zhi-Jie Yan 《Rare Metals》 SCIE EI CAS CSCD 2025年第9期6547-6561,共15页
Elemental modulation and heat treatment optimization have emerged as pivotal strategies for enhancing the soft magnetic properties of alloys.We thoroughly examine the impact of microalloyed Co on the amorphous formati... Elemental modulation and heat treatment optimization have emerged as pivotal strategies for enhancing the soft magnetic properties of alloys.We thoroughly examine the impact of microalloyed Co on the amorphous formation ability,thermal stability,and soft magnetic properties of Fe80CoxSi7-xB8P4Cu1(x=0,0.5,1,1.5,2)alloys.The influence of different annealing processes on these properties is analyzed through detailed insights into the evolution of nanocrystalline microstructure and magnetic domain behavior.Our findings indicate that Co addition facilitates the nucleation and growth of the a-Fe(Si,Co)phase while broadening the thermal processing window,thereby significantly improving the alloy’s soft magnetic properties.Notably,the alloy with x=1 undergoes a pre-annealing and reheating process to yield a finer,denser,and more uniform nanocrystalline structure(average grain size D=20.29 nm,grain density Nd=1.5×1023m-3).This refinement enables the formation of broad magnetic domains characterized by 180°domain walls,culminating in exceptional soft magnetic properties,including a high magnetic flux density(Bs=1.81 T),high effective permeability(μe=18,014),and low coercivity(Hc=5.57 A m-1).Further,the pinning fields(Hp)for the x=1 alloy are notably low,ranging from15 to 20 A m-1,while the maximum effective permeability reaches 69,300.These exceptional properties are directly linked to the alloy’s minimized total free energy(E)and its highly homogeneous microstructure,which collectively suppress magnetic pinning effects.Such characteristics position the x=1 alloy as an exceptional candidate for high-sensitivity applications,particularly in sensor device systems functioning under mild magnetic fields and necessitating swift reaction. 展开更多
关键词 Fe-based amorphousanocrystalline Soft magnetic properties Magnetic domain Nanocrystalline microstructure Pre-annealing
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A controllable one-step millisecond synthesis of nanocrystalline mesoporous MgO with template-free by gliding arc plasma for efficient photocatalytic degradation of organic compounds 认领 引用 被引量：1
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作者 Siyuan Zhang Xiaosong Li +5 位作者 Kexin Li Liang Ma Hainig Liu Shengting Li Mingzhe Dong Xiushen Ye 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第27期195-204,共10页
1.Introduction Magnesium oxide(MgO)has attracted considerable attention in recent years due to its economic viability,excellent biocompatibil-ity,chemical stability,and non-toxic,odorless nature[1,2].These inherent pr... 1.Introduction Magnesium oxide(MgO)has attracted considerable attention in recent years due to its economic viability,excellent biocompatibil-ity,chemical stability,and non-toxic,odorless nature[1,2].These inherent properties position it as a promising candidate for various applications. 展开更多
关键词 nanocrystalline magnesium oxide photocatalytic degradation gliding arc plasma organic compounds mesoporous template free magnesium oxide mgo
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Effect of impact velocity on spall behaviors of nanocrystalline iron:Molecular dynamics study 认领 引用
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作者 Li-Qiong Chen Kui Zhao +3 位作者 Kai Zhang Ze-Zhi Wen Hou-Jin Mei Zhen-Bao Xiong 《Chinese Physics B》 SCIE EI CAS CSCD 2025年第9期374-384,共11页
This study investigates the effect of shock velocity(up)on damage evolution mechanisms in nanocrystalline iron via molecular dynamics simulations.As upincreases,shock wave propagation accelerates,and stress dist... This study investigates the effect of shock velocity(up)on damage evolution mechanisms in nanocrystalline iron via molecular dynamics simulations.As upincreases,shock wave propagation accelerates,and stress distribution transitions from grain boundary concentration to homogeneity.This causes a transition in fracture mode from cleavage to ductile behavior.When upexceeds 1.5 km·s-1,micro-spallation emerges as the dominant failure mode.During micro-spallation,localized melting within the material impedes the propagation of the shock wave.As upincreases,the growth rate of the void volume fraction initially rises but then decreases.Higher upleads to earlier void nucleation.At lower up,the cavitation of the model is mainly characterized by the growth and penetration of a few voids.With increasing up,the number of voids grows,and their interactions expand the delamination damage region.The spall strength demonstrates stage-specific dependence on up.In the classical spallation stage(C_Ⅰ),temperature softening reduces spall strength.In the plastic strengthening regime(C_Ⅱ),strain hardening enhances spall strength.In the micro-spallation stage(M_Ⅲ),further increases in upcause melting during tensile and compressive phases,reducing spall strength.Finally,in the compressionmelting regime(M_Ⅳ),local temperatures exceed the melting point,diminishing plastic damage and accelerating spall strength reduction.This study provides new insights into the dynamic response of nanocrystalline iron. 展开更多
关键词 nanocrystalline iron shock response fragmentation spallation molecular dynamics
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Soft magnetism enhancement and eddy current suppression in bioinspired Iron-based nanocrystalline soft magnetic composites with nacre-like structure 认领 引用
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作者 Wangchang Li Wenbo Xiang +8 位作者 Yue Kang Ting Zou Xiao Han Yao Ying Jing Yu Jingwu Zheng Liang Qiao Juan Li Shenglei Che 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第3期202-210,共9页
Bioinspired nacre-like structured high-density soft magnetic composites(SMCs)have been successfully constructed using flaky-Fe73.8Si13.5B8.7Cu1Nb3 powders in the supercooled liquid region(SCLR).These de... Bioinspired nacre-like structured high-density soft magnetic composites(SMCs)have been successfully constructed using flaky-Fe73.8Si13.5B8.7Cu1Nb3 powders in the supercooled liquid region(SCLR).These densely arranged particles with a consistent planar orientation significantly enhance the soft magnetic properties of SMCs,including high permeability and low magnetic losses.The internal structures of the composites and microstructure evolution of the flaky nanocrystalline particles during the hot-pressing process have been thoroughly studied.Moreover,systematic investigations into the effects of coatings and particle sizes on the maximum permeability and magnetic losses of the composites are conducted.The SMC prepared using the coated particles with a size of 0-100μm exhibits a high maximum perme-ability of 2170(at 1000 Hz)and low magnetic loss of 41.61 W kg-1(at 1000 Hz and 1.0 T).The losses and permeability analysis reveal that the superior performance of these soft magnetic materials is attributed to their laminated structure,insulation coating,and the reduced planar demagnetizing factor.Compared to the traditional silicon steel,this novel SMCs exhibits high magnetic permeability and reduced magnetic losses at frequencies above 1000 Hz,which possess immense application potential within high-frequency electric machines. 展开更多
关键词 Nacre-like structure Nanocrystalline soft magnetic composite High permeability Low magnetic loss
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Size-dependent uniform deformation transitions enabling hardness and toughness enhancement of nanocrystalline Cr2AlC MAX phase 认领 引用 被引量：1
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作者 Shenghao Zhou Jianghuai Yuan +5 位作者 Haichen Wu Kaihang Wang Guanshui Ma Lei Zhang Zhenyu Wang Aiying Wang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第29期170-180,共11页
Ternary layered MAX phase materials have excellent corrosion and oxidation resistance.However,their applications are limited by low hardness yet poor crack resistance,due to weak M–A metallic bonding and poor crack r... Ternary layered MAX phase materials have excellent corrosion and oxidation resistance.However,their applications are limited by low hardness yet poor crack resistance,due to weak M–A metallic bonding and poor crack resistance stemming from their extremely high plastic anisotropy with ultrahigh c/a ratio(>4).In this work,we demonstrate significant improvements in both hardness and crack resistance when the grain size of MAX phases is reduced to nanoscale.Nanocrystalline Cr2AlC MAX coatings with grain size ranging from 0 to 100 nm were successfully fabricated using a controllable PVD-based twostep bottom-up strategy.Remarkable improvements are achieved in both hardness and toughness,with hardness(15.5 GPa)ecord-high strength(8.53 GPa)and toughness/plasticity peaking at a grain size of 15.8 nm near the critical value.Such unusual hardening-toughening effect at nanoscale stems from homogeneous deformation mode transitions with synchronous Hall–Petch hardening.Transmission electron microscopic observations proved that both pyramidal and prismatic slip,which are unlikely to operate at microcrystalline regime at room temperature,are completely active at nanocrystalline regime,unlocking the key c-axial plasticity.As grain size further decreases approaching the critical value,a dynamic grain refinement-induced secondary sub-shear banding mechanism is triggered,which further extends the homogeneous deformation stage.These findings provide a simple route to fabricate advanced MAX phase corrosion-protection coatings with superior mechanical properties for extreme condition applications. 展开更多
关键词 Nanocrystalline Cr2AlC MAX phase Hall-Petch relationship Hardness Toughness Deformation mechanisms
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Loading path and strain rate effects on the deformation behavior of[0001]textured nanocrystalline magnesium:An atomic-scale investigation 认领 引用
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作者 Hui Zhao Xuejian Yang +3 位作者 Yan Peng Lu Wu Yu Wu Baodong Shi 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2025年第2期839-857,共19页
Molecular dynamics(MD)simulation is employed to investigate the deformation behavior under various loading paths and strain rates of nanocrystalline magnesium(NC Mg)with[0001]texture.Atomic-scale structural evolution ... Molecular dynamics(MD)simulation is employed to investigate the deformation behavior under various loading paths and strain rates of nanocrystalline magnesium(NC Mg)with[0001]texture.Atomic-scale structural evolution of NC Mg was performed under uniaxial and biaxial loadings.In tension process,compression twins and basal slip dominate,while the compression process is dominated by tension twins.The activation mechanism of twinning is highly sensitive to the loading path and grain orientation.Meanwhile,the effect of strain rate on the structural evolution of NC Mg was investigated.It is found that the effect of strain rate on the plastic deformation of NC Mg is reflected through the plasticity delays and the way to release the stress.As the strain rate decreases,the plastic deformation mechanism gradually changes from intragranular to grain boundary.Some significant potential deformation mechanisms in the loading process were studied.It is observed that{1121}twins nucleated inside the grains,and the thickening process is completed by basal〈a〉slip of the twin boundary.The strain compatibility between twins is automatically optimized with loading.Moreover,the detwinning mechanism caused by the interaction between twins and basal stacking faults is clarified. 展开更多
关键词 texture Magnesium Nanocrystalline Molecular dynamics Microstructure evolution
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Dynamic mechanical response and deformation-induced co-axial nanocrystalline grains facilitating crack formation in magnesium-yttrium alloy 认领 引用
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作者 Shuang Yang Fei Liu +4 位作者 Fei Chen Yuan-Biao Tan Hao Fu Si-Yuan Wei Song Xiang 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2025年第1期429-441,共13页
The dynamic mechanical response and deformation mechanism of magnesium-yttrium alloy at high strain rate were investigated using split-Hopkinson pressure bar(SHPB)impact,and the microstructure evolution and crack form... The dynamic mechanical response and deformation mechanism of magnesium-yttrium alloy at high strain rate were investigated using split-Hopkinson pressure bar(SHPB)impact,and the microstructure evolution and crack formation mechanism were revealed.The yield strength and work hardening rate increase significantly with increasing impact strain rate.Deformation twinning and non-basal dislocation slip are the primary deformation mechanisms during testing.Contrary to crack initiation mechanism facilitated by adiabatic shear bands,we find that high-density co-axial nanocrystalline grains form near cracks,which leads to local softening and promotes crack initiation and rapid propagation.Most grains have similarorientations,with unique misorientation of 24°,32°,62°,78°and 90°between adjacent grains,suggesting that these grains are primarily formed by interface transformation,which exhibits distinct differences from recrystallized grains.Our results shed light upon the dynamic mechanical response and crack formation mechanism in magnesium alloys under impact deformation. 展开更多
关键词 Magnesium-yttrium alloy SHPB impact Crack initiation Co-axial nanocrystalline grains Interface transformation
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Tuned bi-anisotropy of Y2Co14B nanocrystalline magnetic alloys toward high-frequency applications 认领 引用
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作者 Ling-Feng Wang Ke-Bing Wang +3 位作者 Qi-Ming Chen Chen Wu Xin-Hua Wang Mi Yan 《Rare Metals》 SCIE EI CAS CSCD 2025年第2期1243-1255,共13页
The prevalence of wide-bandgap semiconductors urges the development of advanced soft magnetic materials for high-frequency applications.While soft magnetic alloys are limited by resonances at elevated frequencies,the ... The prevalence of wide-bandgap semiconductors urges the development of advanced soft magnetic materials for high-frequency applications.While soft magnetic alloys are limited by resonances at elevated frequencies,the incorporation of planar anisotropy serves as an effective strategy to overcome this dilemma and extend their potential for high-frequency applications.Herein,nanocrystalline Y2Co14B alloys have been designed with tuned magnetocrystalline and shape bi-anisotropy via melt spinning and magnetic field-assisted annealing.With the application of zero,transverse,rotational and longitudinal magnetic fields(denoted as ZFA,TFA,RFA and LFA),the effects of field direction and annealing time on microstructural and performance evolution have been investigated.Compared with ZFA,magnetic field-assisted annealing not only promotes the growth of nanograins but also alters the coincidence degree between intrinsic easy-plane(IEP)and artificial easy-plane(AEP)structures.While the random distribution of IEP structure is achieved for the RFA due to the formation of non-orientated nanograins,directional magnetic field-assisted annealing contributes to preferentially orientated(006)nanograins,especially for the LFA,resulting in optimal coincidence between the magnetocrystalline anisotropy and shape anisotropy.Such enhancement facilitates the transformation of magnetic domain structures into in-plane configurations with strip-like features.Consequently,a large ratio between the out-of-plane and in-plane anisotropy(Hout/Hin)and improved softness of the alloy can be achieved,providing valuable references for future fabrication of rare-earth(R)transition-metal(T)alloys with superior easy-plane characteristics. 展开更多
关键词 Rare-earth transition-metal alloys Nanocrystalline structure Magnetic field-assist annealing Magnetocrystalline anisotropy Shape anisotropy Soft magnetic properties
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Effect of pulse current and its application direction on the size effect of nanocrystalline nickel foil 认领 引用
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作者 WANG Yi-yan LI Chao +2 位作者 CHEN Zi-shuai DU Jin-yang LI Feng 《Journal of Central South University》 SCIE EI CAS CSCD 2025年第7期2416-2431,共16页
In order to gain a deeper understanding of the effect of pulsed current on the mechanical properties and size effect of nanocrystalline Ni foils,nanocrystalline Ni foils with different grain thickness-to-grain size ra... In order to gain a deeper understanding of the effect of pulsed current on the mechanical properties and size effect of nanocrystalline Ni foils,nanocrystalline Ni foils with different grain thickness-to-grain size ratios(λ)were prepared using pulsed electrodeposition in this paper and unidirectional tensile experiments were carried out at room temperature with different currents and their applied directions.The experimental results show that the nanocrystalline Ni foil produces an obvious electroplasticity effect after applying the current field,and when 300<λ<1100,the current weakens the size effect of nanocrystalline Ni foils to a certain extent,and the angle between the current direction and the deformation direction also affects the mechanical response of nanocrystalline Ni foils,and when the angle between the current direction and the deformation direction is 0°,electroplasticity effect is the best,and the current has the most significant effect of abating the size effect of the material.The mechanism of unidirectional tensile deformation of nanocrystalline Ni foils under the effect of pulsed current was analyzed using TEM and TKD.It was found that the applied pulse current increased the activity of the nanocrystalline boundaries,promoted the movement of dislocations,and reduced the tendency of dislocation entanglement.The higher the peak current density and the smaller the angle between the direction of the current and the direction of deformation,the smaller the grain boundary orientation difference,the more dispersed the grain orientation,and the lower the density of geometrically necessary dislocations(GND)in the deformed nanocrystalline foil,the more significant the effect on material plasticity improvement. 展开更多
关键词 nanocrystalline Ni foil size effect electroplasticity effect current direction
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Enhancement of bending toughness for Fe-based amorphous nanocrystalline alloy with deep cryogenic-cycling treatment 认领 引用
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作者 Yi-ran Zhang Dong Yang +5 位作者 Qing-chun Xiang Hong-yu Liu Jing Pang Ying-lei Ren Xiao-yu Li Ke-qiang Qiu 《China Foundry》 SCIE EI CAS CSCD 2025年第1期99-107,共9页
The effects of deep cryogenic-cycling treatment(DCT)on the mechanical properties,soft magnetic properties,and atomic scale structure of the Fe73.5Si13.5B9Nb3Cu1amorphous nanocrystalline alloy were inves... The effects of deep cryogenic-cycling treatment(DCT)on the mechanical properties,soft magnetic properties,and atomic scale structure of the Fe73.5Si13.5B9Nb3Cu1amorphous nanocrystalline alloy were investigated.The DCT samples were obtained by subjecting the as-annealed samples to a thermal cycling process between the temperature of the supercooled liquid zone and the temperature of liquid nitrogen.Through flat plate bending testing,hardness measurements,and nanoindentation experiment,it is found that the bending toughness of the DCT samples is improved and the soft magnetic properties are also slightly enhanced.These are attributed to the rejuvenation behavior of the DCT samples,which demonstrate a higher enthalpy of relaxation.Therefore,DCT is an effective method to enhance the bending toughness of Fe-based amorphous nanocrystalline alloys without degrading the soft magnetic properties. 展开更多
关键词 deep cryogenic-cycling treatment Fe-based amorphous nanocrystalline alloy bending toughness rejuvenation
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Strong and thermally stable nanocrystalline Cu–Al alloy via Al segregation 认领 引用
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作者 Kaixuan Zhou Luling Wang +6 位作者 Yonghao Zhao Shenbao Jin Qingzhong Mao Shaojia Shi Longlong Ma Ruisheng Zhang Jizi Liu 《International Journal of Extreme Manufacturing》 SCIE EI CAS CSCD 2025年第2期641-659,共19页
Nanocrystalline(NC)metals and alloys are prone to mechanical and thermal instability under force and thermal fields due to their high Gibbs free energy,which limits their industrial applications.In this work,by employ... Nanocrystalline(NC)metals and alloys are prone to mechanical and thermal instability under force and thermal fields due to their high Gibbs free energy,which limits their industrial applications.In this work,by employing rotary swaging(RS),bulk NC Cu–15 at.%Al alloys with both high strength and high thermal stability were prepared.Quasi-static tensile test results show that the yield strength is 1016 MPa.Moreover,the grain growth temperature was retarded up to 0.4 Tm,higher than the literature values.Microstructural characterizations revealed that after RS deformation,coarse-grained Cu–Al was refined into fibrous NC grains with a diameter of 45 nm and a length of 190 nm,and the contents of high-angle grain boundaries(GBs),low-angle GBs,and twin boundaries are 17%,45%,and 38%,respectively.Moreover,there is a significant multiscale chemical fluctuation within the grains,at the GBs,and between the grains through extreme defect accumulation.The atomistic simulation suggests that the segregation behavior of Al solute is essentially driven by the atomic size and local stress state.Besides,Al segregation greatly reduces the grain boundary energy,which further improves the thermal stability of the material.The main strengthening mechanism is Hall–Petch strengthening and the strengthening brought by the chemical fluctuations.Our work provides ideas for designing strong and thermally stable bulk NC alloys. 展开更多
关键词 nanocrystalline Cu–Al alloy rotary swaging strength and thermal stability chemical fluctuations
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