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Interfacial microstructure and mechanical properties of diffusion-bonded Mg-4Y-3RE magnesium alloy 认领 引用
1
作者 Dexi Xu Huiping Wu +3 位作者 Dayong An Qi Hu Xifeng Li Jun Chen 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2026年第5期312-326,共15页
The Mg-4Y-3RE(WE43)magnesium alloy possesses high specific strength,excellent shock absorption,strong electromagnetic shielding,and recyclability.However,the oxidation and defects often happen during conventional weld... The Mg-4Y-3RE(WE43)magnesium alloy possesses high specific strength,excellent shock absorption,strong electromagnetic shielding,and recyclability.However,the oxidation and defects often happen during conventional welding.Solid-state diffusion bonding in a nearvacuum environment enables high-reliability joints by minimizing these issues.It is difficult to obtain high bonding joint strength due to the limitation of various factors.This work systematically investigates the effects of temperature,time,pressure,and surface roughness on the diffusion-bonded joint quality of WE43 magnesium alloy through a phased optimization strategy.The optimal parameter combination is optimized.The results demonstrate that the joint interface achieves a shear strength of 179.9±3.9 MPa and a bonding ratio of 94.14%when the minimal plastic deformation is ensured.Microstructural characterization reveals that recrystallization,precipitates evolution and elemental diffusion effects collectively promote metallurgical bonding at the interface.Subsequent solution treatment at 525℃ for 8 h and aging at 250℃ for 16 h,the shear strength significantly increases to 229.5±5.2 MPa,which represents the highest value in comparable reported studies.This research provides theoretical foundations and technical references for solid-state bonding processes of high-strength magnesium alloys. 展开更多
关键词 WE43 magnesium alloy Diffusion bonding Precipitates evolution Elemental diffusion T6 treatment
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Studies on diffusion and profiles of elements in deep-sea manganese nodules 认领 引用 被引量：2
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作者 Luo Shangde , Wang Lei and Huang Yipu Department of Oceanography, Xiamen University, Xiamen, China 《Acta Oceanologica Sinica》 SCIE CAS 1989年第3期391-400,共10页
Elemental compositions are measured in manganese nodules collected from the Northern Mid-Pacific floor by inductively-coupled plasma atomic emission spectrometry (1CP-AES) and their growth rates are determined by radi... Elemental compositions are measured in manganese nodules collected from the Northern Mid-Pacific floor by inductively-coupled plasma atomic emission spectrometry (1CP-AES) and their growth rates are determined by radiometric methods. The result shows that depth distributions of elements in nodules vary with depth as follows; (i) increase, (ii) decrease and (iii) fluctuation. These internodule variations in elemental compositions are considered to be caused by diffusion and migration of elements in nodules and heterogeneities in textures of nodules. In the present paper, a diffusive model is used to elucidate the inward-increase profile of some elements in nodules. The effective diffusive coefficients are estimated to be of the order of 10-9 cm2/a for Ni, V and Zn in the nodules, which is less than the value reported for radionuclides. 展开更多
关键词 Studies on diffusion and profiles of elements in deep-sea manganese nodules deep
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Analysis of Linear Triangular Elements for Convection-diffusion Problems by Streamline Diffusion Finite Element Methods 认领 引用
3
作者 ZHOU Jun-ming JIN Da-yong ZHANG Shu-hua 《Chinese Quarterly Journal of Mathematics》 北大核心 2007年第1期43-51,共9页
This paper is devoted to studying the superconvergence of streamline diffusion finite element methods for convection-diffusion problems. In [8], under the condition that ε ≤ h^2 the optimal finite element error esti... This paper is devoted to studying the superconvergence of streamline diffusion finite element methods for convection-diffusion problems. In [8], under the condition that ε ≤ h^2 the optimal finite element error estimate was obtained in L^2-norm. In the present paper, however, the same error estimate result is gained under the weaker condition that ε≤h. 展开更多
关键词 convection-diffusion streamline diffusion finite element methods linear triangular elements superconvergence
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Coalescence-Ripening Mechanism of γ′-Ni3(Al,Ti)During Long-Term/High-Temperature Operation of Ni-Based Superalloy Discs 认领 引用
4
作者 Zhaotian Wang Yongquan Ning +3 位作者 Bingchao Xie Xiaoguang Fan Mei Zhan Mingwang Fu 《Rare Metals》 SCIE EI CAS CSCD 2026年第3期329-343,共15页
The evolution of the γ'-Ni3(Al,Ti)phase in superalloys is governed by a coupled coalescence-ripening mechanism driven by elemental diffusion.In this study,thermal exposure experiments were performed at 750℃an... The evolution of the γ'-Ni3(Al,Ti)phase in superalloys is governed by a coupled coalescence-ripening mechanism driven by elemental diffusion.In this study,thermal exposure experiments were performed at 750℃and 800℃for durations ranging from 100 to 20,000 h.The γ'phase underwent coalescence-ripening,with its morphology evolving from small spherical particles to elliptical and finally to large spherical particles.During this process,high chemical potential gradients were observed around small-diameter γ'phases and at the long-axis ends of elliptical γ'phases.These gradients drove the dissolution of smaller γ'phases by larger ones and the evolution of elliptical γ'into spherical ones.Concurrently,the Ni/(Al+Ti)ratio in the γ'phase decreased from 3.26 to 3.02 during exposure at 800℃.High-resolution scanning transmission electron microscopy(HR-STEM)analysis revealed complex atomic arrangements at the γ/γ'interface and the dislocation,featuring variations in interplanar distance and abundant edge dislocations,which serve as efficient pathways for atomic diffusion.Moreover,as the γ'phase coarsened,the γ/γ'interfaces remained coherent,with the lattice mismatch gradually approaching zero.Geometric phase analysis(GPA)indicated a significant relaxation of elastic strain at these interfaces.Based on the change in Al concentration at the γ/γ'interfaces,the interfacial energy decreased by approximately 3 times between 100 and 20,000 h of exposure at 800℃.This study provides foundational insights for a deeper understanding of elemental diffusion mechanisms in superalloys. 展开更多
关键词 γ'phase coalescence-ripening elemental diffusion energy nickel-based superalloy
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Influence of Al foil interlayer on performance of vacuum diffusion bonding joint of 6061 aluminium alloy 认领 引用 被引量：5
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作者 Da-shuang Liu Jian-hua Xu +9 位作者 Xiong-hui Li Ping Wei Yun Liang Jian Qin Hua-wei Sun Tian-ran Ding Zong-ye Ding Su-juan Zhong Lei Zhang Wei-min Long 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2024年第10期2404-2412,共9页
The vacuum diffusion bonding method was used to introduce Al foil as the middle layer,and 6061 aluminium alloy was vacuum diffusion bonding together.The typical microstructure characteristics and mechanical properties... The vacuum diffusion bonding method was used to introduce Al foil as the middle layer,and 6061 aluminium alloy was vacuum diffusion bonding together.The typical microstructure characteristics and mechanical properties of 6061/Al/6061 welded joints were studied in detail,the effects of process parameters and Al intermediate layer on the microstructure and mechanical properties were revealed,and the diffusion bonding mechanism of 6061/Al/6061 welded joints was described.Al foil middle layer welded joint had the best performance at the temperature of 540℃,the holding time of 120 min,and the welding pressure of 4 MPa.The bonding ratio is 95.91%,the shear strength is 79 MPa,and the deformation rate is 8.05%,and the introduction of Al intermediate layer improves the element distribution and microstructure,so that the bonding ratio of the welded joint is increased by 10.86%,the shear strength is increased by 5.55 MPa,and the deformation rate is reduced by 1.58%.The fracture morphology has typical ductile fracture characteristics. 展开更多
关键词 6061 aluminium alloy Diffusion bonding Interlayer Joint performance Elemental diffusion
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Oxidation Performance and Interdiffusion Behaviour of two MCrAlY Coatings on a Fourth-Generation Single-Crystal Superalloy 认领 引用 被引量：5
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作者 K.J.Tan J.J.Liang +5 位作者 X.G.Wang X.P.Tao J.Gong C.Sun Y.Z.Zhou X.F.Sun 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2022年第4期679-692,共14页
The oxidation behaviour of a fourth-generation single-crystal superalloy without coating and with two types of MCrAlY coatings at 1140℃was studied.The results showed that both coatings greatly improved the oxidation ... The oxidation behaviour of a fourth-generation single-crystal superalloy without coating and with two types of MCrAlY coatings at 1140℃was studied.The results showed that both coatings greatly improved the oxidation resistance of the superalloy,and the addition of Hf further improved the oxidation resistance by pinning the oxide layer into the coating.Before and after oxidation,obvious Cr and Al interdiffusion was detected.Inward Cr diffusion induces the precipitation of a topologically close-packed phase,while the diffusion of Al affects the structure of theγ/γ’phase,the solubility of refractory elements,and the formation of an interdiffusion zone. 展开更多
关键词 Superalloys Metal coatings Oxidation Electron probe microanalyser(EPMA) Element diffusion
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Effect of temperature on interface diffusion in micro solder joint under current stressing 认领 引用 被引量：4
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作者 李雪梅 孙凤莲 +1 位作者 张浩 辛瞳 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第5期1699-1703,共5页
The effects of temperature on Cu pad consumption and intermetallic compound（IMC） growth were investigated under current stressing. The Cu/Sn-3.0Ag-0.5Cu（SAC305）/Cu solder joints were used, with a certain current d... The effects of temperature on Cu pad consumption and intermetallic compound（IMC） growth were investigated under current stressing. The Cu/Sn-3.0Ag-0.5Cu（SAC305）/Cu solder joints were used, with a certain current density of 0.76×104A/cm^2 at 100, 140, 160 and 180 °C. The constitutive equations of cathode Cu pad consumption and anode interface IMC growth are established, respectively, based on the loading time and sample temperature. The cathode Cu pad consumption（δ） increases linearly with the loading time and the consumption rate shows parabolic curve relationships with sample temperature. The anode interface IMC thickness（δ1） increased is linearly with the square root of loading time and the interface IMC growth coefficient shows parabolic curve relationship with sample temperature. The δ and δ1 have different variation laws under current stressing, due to the current facilitating larger amount of IMC formation in the bulk solder. 展开更多
关键词 electromigration element diffusion intermetallic compounds Cu pad consumption
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High-current pulsed electron beam modification on microstructure and performance of Cu/CuW diffusion bonding joints 认领 引用 被引量：1
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作者 Na-Na Tian Cong-Lin Zhang +4 位作者 Peng Lyu Jin-Tong Guan Jie Cai Qing-Feng Guan Shun Guo 《Rare Metals》 SCIE EI CAS CSCD 2024年第6期2819-2831,共13页
This study investigates the influence of high-current pulsed electron beam(HCPEB)modification on the microstructure and shear strength of Cu/CuW joints.Reliable solid-state diffusion bonding of modified-Cu(MCu)and mod... This study investigates the influence of high-current pulsed electron beam(HCPEB)modification on the microstructure and shear strength of Cu/CuW joints.Reliable solid-state diffusion bonding of modified-Cu(MCu)and modified-CuW(M-CuW)was achieved by HCPEB modification pretreatment at a temperature of 800-900℃and a pressure of 5 MPa for 10-50 min.Experiments demonstrate that HCPEB modification facilitates the dissolution of W and Cu,resulting in the formation of a Cu0.4W0.6solid solution and thus enhancing the uniform distribution of microstructures.Additionally,HCPEB-induced defects play a beneficial role in promoting the diffusion process by providing fast diffusion paths for elements.The optimal joints with the maximum shear strength of 213.7 MPa were obtained through bonding M-Cu and M-CuW at 900℃and 5 MPa for 30 min,which attributes to the combined effects of fine-grained strengthening and solid solution strengthening.Overall,the application of HCPEB modification showcases its effectiveness in promoting element diffusion and enhancing the mechanical performance of the joints. 展开更多
关键词 HCPEB Element diffusion Shear strength Crystal defects Surface modification
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A Priori and A Posteriori Error Estimates of Streamline Diffusion Finite Element Method for Optimal Control Problem Governed by Convection Dominated Diffusion Equation 认领 引用 被引量：5
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作者 Ningning Yan Zhaojie Zhou 《Numerical Mathematics(Theory,Methods and Applications)》 SCIE EI 2008年第3期297-320,共24页
In this paper,we investigate a streamline diffusion finite element approxi-mation scheme for the constrained optimal control problem governed by linear con-vection dominated diffusion equations.We prove the existence ... In this paper,we investigate a streamline diffusion finite element approxi-mation scheme for the constrained optimal control problem governed by linear con-vection dominated diffusion equations.We prove the existence and uniqueness of the discretized scheme.Then a priori and a posteriori error estimates are derived for the state,the co-state and the control.Three numerical examples are presented to illustrate our theoretical results. 展开更多
关键词 Constrained optimal control problem convection dominated diffusion equation stream-line diffusion finite element method a priori error estimate a posteriori error estimate.
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Preparation of Wear Resistant Materials by Melting and Diffusion Process 认领 引用 被引量：1
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作者 余世浩 WEI Xueping ZENG Hui 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2012年第6期1072-1076,共5页
A wear-resistant material reinforced with VCp was manufactured by the in-mold melting process, in which the high-vanadium alloy-rods were melted by high temperature liquid steel and elements diffused into the liquid. ... A wear-resistant material reinforced with VCp was manufactured by the in-mold melting process, in which the high-vanadium alloy-rods were melted by high temperature liquid steel and elements diffused into the liquid. Microstructure of the material was examined by OM, SEM, and XRD, and alloy elements in the diffusion layer were studied by EDS, and the hardness of the material was tested by HRS. The experimental results show that the material gradually changes hardness, which is due to the uniformly existents of carbide particles on martensite matrix and the gradient distribution of vanadium and carbide. 展开更多
关键词 in-mold melting elements diffused reinforced with VCp wear resistant
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Diffusion behavior at void tip and its contributions to void shrinkage during solid-state bonding 认领 引用 被引量：6
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作者 C.Zhang M.Q.Li H.Li 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2018年第8期1449-1454,共6页
Solid-state diffusion bonding is an advanced joining technique, which has been widely used to join similar or dissimilar materials. Generally, it is easy to observe the diffusion behavior during dissimilar bonding, bu... Solid-state diffusion bonding is an advanced joining technique, which has been widely used to join similar or dissimilar materials. Generally, it is easy to observe the diffusion behavior during dissimilar bonding, but for similar bonding the diffusion behavior has yet been observed via experiments. In this study, the diffusion behavior at void tip was firstly observed during similar bonding of stainless steel. Scanning electron microscopy with energy dispersive spectroscopy was used to examine the interface charac- teristic and diffusion behavior. The results showed that a diffusion region was discovered at void tip. Element concentrations of diffusion region were more than those of void region, but less than those of bonded region. This behavior indicated that the diffusion was ongoing at void tip, but the perfect bond has yet formed. The diffusion region was attributed to the interface diffusion from adjacent region to void tip due to the stress gradient along bonding interface. The mass accumulation at void tip transformed the sharp void tip into smooth one at the beginning of void shrinkage, and then resulted in shorter voids. 展开更多
关键词 Stainless steel Micro-void morphology Solid-state bonding Void tip Element diffusion
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Microstructure in the Weld Metal of Austenitic-Pearlitic Dissimilar Steels and Diffusion of Element in the Fusion Zone 认领 引用 被引量：6
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作者 Yajiang LI, Zengda ZOU and Bing ZHOU Department of Materials Engineering, Shandong University, Jinan 250061, China E-mail: yajli@jn-public.sd.cninfo.net 《Journal of Materials Science & Technology》 SCIE EI CAS 2001年第3期338-342,共5页
Microstructure and alloy element distribution in the welded joint between austenitic stainless steel (1Cr18Ni9Ti) and pearlitic heat-resistant steel (1Cr5Mo) were researched by means of light microscopy, scanning elec... Microstructure and alloy element distribution in the welded joint between austenitic stainless steel (1Cr18Ni9Ti) and pearlitic heat-resistant steel (1Cr5Mo) were researched by means of light microscopy, scanning electron microscopy (SEM) and electron probe microanalysis (EPMA). Microstructure, divisions of the fusion zone and elemental diffusion distributions in the welded joints were investigated. Furthermore, solidification microstructure and S-ferrite distribution in the weld metal of these steels are also discussed. 展开更多
关键词 Microstructure in the Weld Metal of Austenitic-Pearlitic Dissimilar Steels and Diffusion of Element in the Fusion Zone
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Adaptive Finite Element Method for Steady Convection-Diffusion Equation 认领 引用
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作者 Gelaw Temesgen Mekuria Jakkula Anand Rao 《American Journal of Computational Mathematics》 2016年第3期275-285,共11页
This paper examines the numerical solution of the convection-diffusion equation in 2-D. The solution of this equation possesses singularities in the form of boundary or interior layers due to non-smooth boundary condi... This paper examines the numerical solution of the convection-diffusion equation in 2-D. The solution of this equation possesses singularities in the form of boundary or interior layers due to non-smooth boundary conditions. To overcome such singularities arising from these critical regions, the adaptive finite element method is employed. This scheme is based on the streamline diffusion method combined with Neumann-type posteriori estimator. The effectiveness of this approach is illustrated by different examples with several numerical experiments. 展开更多
关键词 Convection-Diffusion Problem Streamline Diffusion Finite Element Method Boundary and Interior Layers A Posteriori Error Estimators Adaptive Mesh Refinement
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Annealing-induced strengthening in hetero-structured Mg alloy laminates with gradient Al content 认领 引用
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作者 Xiang Chen Yuhao Liu +7 位作者 Qiuyue Shi Junlei Zhang Chao He Qi Zhao Shuo Wang Yifu Shen Shuping Tan Lifei Wang 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2025年第11期5369-5376,共8页
This study developed a five-layer Mg alloy laminate(pure Mg/AZ31/AZ91/AZ31/pure Mg)through an innovative synergistic strategy involving Al-element gradient design,extrusion,and short-term annealing.Microstructural cha... This study developed a five-layer Mg alloy laminate(pure Mg/AZ31/AZ91/AZ31/pure Mg)through an innovative synergistic strategy involving Al-element gradient design,extrusion,and short-term annealing.Microstructural characterization revealed hierarchical heterogeneities in grain size,texture intensity,dislocation density,and precipitated phases,accompanied by the formation of annealing twinning in pure Mg layer—a phenomenon rarely documented in Mg alloys.Mechanical tests demonstrated significant strengthening effects in all annealed samples,particularly in the 300℃/30 min annealed sample,which achieved the optimal comprehensive mechanical properties.The enhanced strength originated from the synergistic interaction among element-diffusion-induced solid solution strengthening,nanoscale β-Mg17Al12 precipitation,and hetero-deformation-induced(HDI)strengthening.This approach breaks the strength-ductility trade-off induced by traditional annealing processes,offering a new paradigm for designing high-performance Mg alloy laminates. 展开更多
关键词 Mg alloy laminates Annealing strengthening Heterostructures Mechanical properties Element diffusion
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Forming characteristics of bi-metallic composite shafts by cross-wedge rolling 认领 引用
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作者 Jun-ling Li Jia-long Lu +4 位作者 Ao Wang Le Zhu Chao-yang Sun Bao-yu Wang Zhi-gang Li 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2025年第9期2820-2833,共14页
To address the increasing demand for corrosion-resistant shaft components,a bi-metallic composite shaft comprising carbon steel,which is known for its high thermal strength,and stainless cladding,which offers excellen... To address the increasing demand for corrosion-resistant shaft components,a bi-metallic composite shaft comprising carbon steel,which is known for its high thermal strength,and stainless cladding,which offers excellent corrosion resistance,was introduced.A novel method for manufacturing these composite shaft parts using cross-wedge rolling(CWR)was proposed and explored.Thermal simulation experiments,CWR forming trials and finite element analysis were conducted to examine the coordinated deformation during the CWR process.The results revealed a downhill diffusion pattern of elements from higher to lower-concentration areas,forming a smooth and uniform concentration gradient.When the cladding thickness(CT)ranged from 3 to 4 mm,the trajectories of the points on both the cladding material and the substrate coincided,indicating strong bonding at the transitional interface of the composite shaft.Conversely,with a CT of 5 mm,coordinated deformation between the substrate and cladding material was not achieved.Shear strength tests demonstrated a gradual decrease in strength with increasing CT.The microscopic morphology of the interface showed that the metal grains near both sides of the interface were refined,and the binding interface displayed a slightly curved shape.A viable method was provided for producing high-performance corrosion-resistant composite shaft components using CWR technology. 展开更多
关键词 Cross-wedge rolling Bi-metallic shaft Elemental diffusion Shear strength
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Heterogeneous Interface Microstructure and Thermoelectromagnetic Conversion Performance of BiSbTe/MnCoGe Multifunctional Materials 认领 引用
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作者 Longli Wang Rongcheng Li +3 位作者 Peilin Miao Jiushun Zhu Gangjian Tan Xinfeng Tang 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2025年第5期839-848,共10页
The synergistic cooling of thermoelectromagnetic materials promises a breakthrough in the efficiency of single refrigeration and has attracted extensive research.The study of heterogeneous interface is crucial for ach... The synergistic cooling of thermoelectromagnetic materials promises a breakthrough in the efficiency of single refrigeration and has attracted extensive research.The study of heterogeneous interface is crucial for achieving the synergistic performance of both materials.In this work,a composite material comprising Bi2Te3-based thermoelectric material and MnCoGe-based magnetocaloric material is synthesized,which is a material exhibiting both thermoelectric and magnetocaloric properties.During the plasma-activated sintering process of the composite material,elemental interdiffusion of Mn,Co,Sb,and Te occurs,forming a diffusion layer of MnTe and CoSbTe.Reaction of heterogeneous interface leads to point defects within the material,significantly increasing the carrier concentration.Optimization of the sintering temperature results in a thermoelectric figure of merit(ZT)of 0.69 at 300 K and−ΔSmax of 0.97 J kg−1 K−1 at room temperature under a 5 T magnetic field for the Bi0.5Sb1.5Te3/10 wt%Mn0.9Cu0.1CoGe composite sintered at 623 K and under 50 MPa.This study demonstrates that Bi0.5Sb1.5Te3/Mn0.9Cu0.1CoGe is a potential candidate for efficient thermoelectromagnetic cooling applications. 展开更多
关键词 Thermoelectromagnetic cooling Elemental diffusion Thermoelectric Magnetocaloric Composite
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Abnormal interfacial bonding mechanisms of multi-material additive-manufactured tungsten-stainless steel sandwich structure 认领 引用 被引量：14
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作者 Chao Wei Heng Gu +5 位作者 Yuchen Gu Luchao Liu Yihe Huang Dongxu Cheng Zhaoqing Li Lin Li 《International Journal of Extreme Manufacturing》 SCIE EI CAS CSCD 2022年第2期113-128,共16页
Tungsten(W)and stainless steel(SS)are well known for the high melting point and good corrosion resistance respectively.Bimetallic W-SS structures would offer potential applications in extreme environments.In this stud... Tungsten(W)and stainless steel(SS)are well known for the high melting point and good corrosion resistance respectively.Bimetallic W-SS structures would offer potential applications in extreme environments.In this study,a SS→W→SS sandwich structure is fabricated via a special laser powder bed fusion(LPBF)method based on an ultrasonic-assisted powder deposition mechanism.Material characterization of the SS→W interface and W→SS interface was conducted,including microstructure,element distribution,phase distribution,and nano-hardness.A coupled modelling method,combining computational fluid dynamics modelling with discrete element method,simulated the melt pool dynamics and solidification at the material interfaces.The study shows that the interface bonding of SS→W(SS printed on W)is the combined effect of solid-state diffusion with different elemental diffusion rates and grain boundary diffusion.The keyhole mode of the melt pool at the W→SS(W printed on SS)interface makes the pre-printed SS layers repeatedly remelted,causing the liquid W to flow into the sub-surface of the pre-printed SS through the keyhole cavities realizing the bonding of the W→SS interface.The above interfacial bonding behaviours are significantly different from the previously reported bonding mechanism based on the melt pool convection during multiple material LPBF.The abnormal material interfacial bonding behaviours are reported for the first time. 展开更多
关键词 multi-material additive manufacturing laser powder bed fusion interfacial bonding element diffusion keyhole mode
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Evolution of secondary phases and properties of 7B04 aluminum alloy during DC homogenization 认领 引用 被引量：8
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作者 何立子 贾品峰 +1 位作者 张林 崔建忠 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第2期319-327,共9页
The effects of the direct current （DC） on the evolutions of hardness and morphology of the secondary phases in 7B04 aluminum alloy homogenized at 380？465 ℃ for 2 h were investigated in detail by electric conductiv... The effects of the direct current （DC） on the evolutions of hardness and morphology of the secondary phases in 7B04 aluminum alloy homogenized at 380？465 ℃ for 2 h were investigated in detail by electric conductivity measurement, hardness test, X-ray diffraction analysis, field emission scanning electron microscopy and energy dispersive spectrometry. The results show that with increasing temperature from 380 to 465 ℃, the electric conductivity of normal homogenized sample decreases from 34.9%IACS to 28.7%IACS, the hardness increases from HV 96 to HV 146, and the area fraction of secondary phase reduces from 4.5% to 1.89%. While, DC homogenized sample has a higher hardness, a lower electric conductivity and a smaller area fraction of secondary phases at the same temperature. The DC enhances the homogenization process by promoting the diffusibility of the solute atoms and the mobility of vacancy. 展开更多
关键词 7B04 aluminum alloy direct current homogenization hardness secondary phase elemental diffusion
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Effects of Ta content on microstructure and oxidation behavior of AlCoCrFeNiYTaxhigh entropy alloy 认领 引用 被引量：7
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作者 Cang Gu Jun-Hao Hu +6 位作者 Jian-Bo Song Cheng Xu Ming-Yu Hu Yu-Xuan Zhang Jiang Tian Chao Li Jing Feng 《Rare Metals》 SCIE EI CAS CSCD 2024年第9期4462-4475,共14页
The oxidation behavior of the Al CoCrFeNiYTaxhigh entropy alloy(HEA)doped with different Ta contents at 1100℃is investigated.In this study,different reasons for the spallation of the oxide scales of HEAs without/w... The oxidation behavior of the Al CoCrFeNiYTaxhigh entropy alloy(HEA)doped with different Ta contents at 1100℃is investigated.In this study,different reasons for the spallation of the oxide scales of HEAs without/with excessive Ta addition after 1000 h of oxidation are discussed,and the most suitable Ta doping content for this HEA is explored,in which the HEA exhibits both an exceptionally low oxidation rate,and the formation of oxide scales composed of intact a-Al2O3.Meanwhile,it is found that the addition of Ta can effectively inhibit the phase transition of β phase,which makes the surface of the oxide scale smoother.By combining our experimental results with Wagner–Hauffe theory,the influence of Ta drag effect on oxide scale growth is explained,which provides some theoretical guidance for the subsequent design of AlCoCrFeNi HEAs,and can lead to the development of thermal barrier coatings at higher service temperature. 展开更多
关键词 High-entropy alloy Al2O3scales Oxidation Elements diffusion
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Ultra-fast amorphization of crystalline alloys by ultrasonic vibrations 认领 引用 被引量：4
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作者 Luyao Li Guo-Jian Lyu +10 位作者 Hongzhen Li Caitao Fan Wenxin Wen Hongji Lin Bo Huang Sajad Sohrabi Shuai Ren Xiong Liang Yun-Jiang Wang Jiang Ma Weihua Wang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2023年第11期76-88,共13页
The amorphization of alloys is of both broad scientific interests and engineering significance.Despite considered as an efficient strategy to regulate and even achieve record-breaking properties of metallic materials,... The amorphization of alloys is of both broad scientific interests and engineering significance.Despite considered as an efficient strategy to regulate and even achieve record-breaking properties of metallic materials,a facile and rapid method to trigger solid-state amorphization is still being pursued.Here we report such a method to utilize ultrasonic vibration to trigger amorphization of intermetallic compound.The ultrasonic vibrations can cause tunable amorphization at room temperature and low stress(2 MPa)conveniently.Remarkably,the ultrasonic-induced amorphization could be achieved in 60 s,which is 360 times faster than the ball milling(2.16×104 s)with the similar proportion of amorphization.The elements redistribute uniformly and rapidly via the activated short-circuit diffusion.Both experimental evidences and simulations show that the amorphous phase initiates and expands at nanograin boundaries,owing to the induction of lattice instability.This work provides a groundbreaking strategy for developing novel materials with tunable structures and properties. 展开更多
关键词 Amorphization Ultrasonic vibration Lattice instability Elemental diffusion
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