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Estimation of Peierls-Nabarro stress of dislocations by the first-principles calculation in Mg alloys and their effects on plasticity 认领 引用
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作者 Mingdi Yu Jingya Wang +7 位作者 Zhigang Ding Bo Hu Hongwei Xiong Sheng Zhang Zhenfei Jiang Zhihua Dong Tao Ying Xiaoqin Zeng 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2026年第4期143-159,共17页
Poor plasticity is an intrinsic disadvantage of magnesium(Mg)alloys,which limits their wide application at room temperature.Alloying is an accepted method to tune the plastic deformation mode and improve plasticity.Ho... Poor plasticity is an intrinsic disadvantage of magnesium(Mg)alloys,which limits their wide application at room temperature.Alloying is an accepted method to tune the plastic deformation mode and improve plasticity.However,the effect of solute atoms on the activation of different dislocations is still unclear and has rarely been systematically investigated in Mg alloys.In this work,the formulations of Peierls-Nabarro stresses(σp)for edge and screw dislocations along various slip planes in Mg-X(X=Y,Ca,Nd,Zn,Al and Sn)alloys are firstly derivate,as well as the calculation of the parameter K(energy factor)based on the first-principles calculation.The effects of solute atoms on the σp of various types of dislocations are systematically studied.The difference of the σp between the Mg-X alloy and pure Mg,i.e.,△σp,is determined,which is strongly influenced by the solute atoms.The negative △σp reflects the promotion of dislocation activation.The relationship between the △σp of different non-basal dislocations and elongation in eight Mg-X alloys is explored.The simultaneous improvement of the activation of the prismaticand the pyramidaldislocations is discovered,which can be achieved by specific alloying elements.Cooperative activation of the prismaticand the pyramidaldislocations owing to the reduced △σp is shown to closely correlate with the significant increased plasticity of the Mg alloys.These findings advance a novel perspective on alloy design strategies for Mg alloys with improved plasticity. 展开更多
关键词 Mg alloys Peierls-Nabarro stress First-principles calculation Non-basal slip activity Generalized stacking fault energy
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Effect of rotary swaging on the microstructure and mechanical properties of Mg-Zn-Ca/SiCp composites 认领 引用
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作者 Hongwei Xiong Lidong Gu +6 位作者 Mingdi Yu Wenfei Luo Jingya Wang Chenyang Jiang Liping Zhou Tao Ying Xiaoqin Zeng 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2026年第2期202-217,共16页
Due to the poor plasticity and deformability,magnesium matrix composites are difficult to strengthen using traditional severe plastic deformation(SPD)processes.In this study,we applied a large deformation of 0.36 to S... Due to the poor plasticity and deformability,magnesium matrix composites are difficult to strengthen using traditional severe plastic deformation(SPD)processes.In this study,we applied a large deformation of 0.36 to SiC particles reinforced Mg-Zn-Ca(ZX50/SiCp)composites at room temperature via rotary swaging(RS).The RS process significantly increased the yield strength of the composite from 174.1 MPa after extrusion to 346.5 MPa after RS with ten passes,representing a 98%enhancement.The remarkable strengthening effect was primarily attributed to grain boundaries strengthening,dislocation strengthening and precipitation strengthening effects.The results indicated that the average grain size of the composite refined to 16μm after ten passes,and a substantial number of deformation twins were developed in the host grains.The interactions between twin boundaries and precipitates as well as reinforcement particles blocked the twin growth,resulting in dense twin networks.With increasing strain,multiple twins developed to further refine the twin lamella.Furthermore,the activation of numerous dislocations developed dislocation arrays and the geometrically necessary dislocations(GNDs)density increased from 2.8×1014 to 7.2×1014 m-2.In addition,dynamic precipitation occurred during the RS process,resulting in the formation of substantial nano-scale Mg-Zn second phases(average diameter∼70 nm).The severe shear strain during the RS process promoted the uniformly dispersion of reinforcement particles.These findings provide valuable insights into the fabrication and strengthening of magnesium matrix composites through the proposed RS process. 展开更多
关键词 Magnesium matrix composite Rotary swaging Deformation twin Dislocation Strengthening mechanism
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Flame ignition mechanism of magnesium alloys controlled by oxide films based on the oxidation behaviors of Al,Nd and Y 认领 引用
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作者 Bo Hu Jiaxuan Han +7 位作者 Zhenfei Jiang Fanjin Yao Mingdi Yu Yahuan Zhao Zixin Li Dejiang Li Xiaoqin Zeng Wenjiang Ding 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第9期123-138,共16页
Oxide films hinder diffusion and resist external forces,which determines the flame ignition mechanism of magnesium alloys.The effects of the continuity,compactness and mechanical properties of oxide films on the ignit... Oxide films hinder diffusion and resist external forces,which determines the flame ignition mechanism of magnesium alloys.The effects of the continuity,compactness and mechanical properties of oxide films on the ignition mechanism were analyzed,by investigating the flame ignition behaviors of AZ80(ZM5),EZ30K(ZM6)and WE43 Mg alloys.The results show that the rupture of the oxide films caused by liquid gravity was the key to causing ignition.According to thermodynamic calculations,compared with Mg,Al cannot be preferentially oxidized;while Nd can be preferentially oxidized through significant enrichment,resulting in a discontinuous Nd2O3inner layer in the ZM6 alloy;in contrast,Y has a strong preferential oxidation ability,which gives the WE43 alloy a continuous Y2O3inner layer and self-healing ability.In addition,the oxide film of the ZM5 alloy is loose and has poor mechanical properties,so it cannot effec-tively hinder diffusion and resist liquid gravity.Differently,the oxide films of the ZM6 and WE43 alloys are dense and have better mechanical properties,leading to higher ignition temperatures and longer igni-tion times.In addition,a criterion was proposed to predict the ignition time based on the law of energy conservation,and it was simplified to predict the ignition temperature.The errors between the predicted and measured values are within 11%. 展开更多
关键词 Mg alloys Flame ignition mechanism Oxide film Ignition criterion
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Post-fire residual service performance of magnesium alloys reinforced by rare earths 认领 引用 被引量：4
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作者 Jiaxuan Han Bo Hu +8 位作者 Zhenfei Jiang Mingdi Yu Fanjin Yao Zixin Li Bensong Chen Wanzhang Yang Dejiang Li Xiaoqin Zeng Wenjiang Ding 《Journal of Rare Earths》 SCIE EI CAS CSCD 2024年第12期2374-2384,I0007,共11页
The flammability of magnesium alloys continues to be a significant barrier to their extensive application,and alloying with rare earth elements(REs)is an effective way to enhance the ignition and fire resistance of Mg... The flammability of magnesium alloys continues to be a significant barrier to their extensive application,and alloying with rare earth elements(REs)is an effective way to enhance the ignition and fire resistance of Mg alloys.Three commercial as-extruded Mg alloys(AZ80 and two Mg-RE alloys:EZ30K and WE43)were directly exposed to flame heating for revealing the evolutions of microstructure and mechanical properties,which is valuable in assessing the post-fire residual service performance of Mg alloy components.Results show that secondary phase dissolution,grain growth,grain boundary melting,alloy melting,and defects generation successively occur during the heating process.After short-term heating for 30 s,the elongation of AZ80 alloy increases significantly by 214%,from 3.82%to 12.01%,with minimal change in strength compared to the initial unheated state.This transformation is attributed to the recovery,grain growth,Mg17Al12 dissolution and dislocation density reduction.Conversely,EZ30K and WE43 alloys exhibit minimal changes in mechanical properties after short-term heating for 60 s,attributed to the pinning effect of REs.However,in subsequent heating states,resolidified microstructure and the presence of defects lead to a noteworthy decrease in both strength and elongation.Among these three alloys,the fire resistance follows this ranking:EZ30K>WE43>AZ80,primarily due to the high thermal conductivity of EZ30K alloy and the thermal stability improved by the addition of REs. 展开更多
关键词 Magnesium alloys Rare earths Fire Residual service performance Microstructure Mechanical properties
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Dominant Deformation Mechanisms in Mg–Zn–Ca Alloy 认领 引用
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作者 Tao Ying Mingdi Yu +3 位作者 Yiwen Chen Huan Zhang Jingya Wang Xiaoqin Zeng 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2022年第12期1973-1982,共10页
The coaddition of Zn and Ca has great potential to improve the ductility of Mg alloys.Herein,the mechanical properties of an extruded Mg-Zn-Ca solid-solution alloy were studied by quasi-in situ electron backscatter di... The coaddition of Zn and Ca has great potential to improve the ductility of Mg alloys.Herein,the mechanical properties of an extruded Mg-Zn-Ca solid-solution alloy were studied by quasi-in situ electron backscatter diffraction(EBSD)-assisted slip trace analysis.The dominant deformation mechanisms of the Mg-Zn-Ca alloy were studied,and the origins of enhanced ductility were systematically revealed.The results indicate that most grains deformed by basal slip.In addition,multiple non-bas al slip traces were detected(particularly prismatic,pyramidal I,and pyramidal Islip traces),and their activation frequency was promoted with increasing tensile strain.The enhanced participation of non-basal slip systems is believed to play a critical role in achieving homogeneous plastic deformation,thus effectively promoting the ductility of the Mg-Zn-Ca alloy.Furthermore,first-principle calculations revealed that the coaddition of Zn and Ca significantly reduces the unstable stacking fault energy for non-basal slip,which contributes to the activation of non-basal slip systems during plastic deformation. 展开更多
关键词 Mg-Zn-Ca alloy Non-basal slip activities First-principle calculations Generalized stacking fault energy Deformation mechanisms
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Elucidation of microscopic mechanisms of tweens on whipping capabilities of aerated emulsions:Fat crystal-membrane interaction perspective 认领 引用
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作者 Pengkai Xie Limin Cui +5 位作者 Mingdi Yu Yulong Shao Abdelaziz Elbarbary Qingzhe Jin Xingguo Wang Jun Jin 《Food Bioscience》 SCIE 2024年第6期4515-4525,共11页
Aerated emulsions find wide applications in the food industry,with partial coalescence playing a crucial role as the core of such products in whipping capabilities.Although tweens are the most traditional emulsifiers ... Aerated emulsions find wide applications in the food industry,with partial coalescence playing a crucial role as the core of such products in whipping capabilities.Although tweens are the most traditional emulsifiers used in aerated emulsions,the microscopic mechanisms of how they work are still not fully understood.This study focused on elucidating the mechanisms of Tweens in fat crystallization,oil-water interface rheology,and fat globule interface membrane properties,clarifying their roles in partial coalescence and whipping capabilities.The fat crystals induced by Tween 20(T20)faced difficulty in puncturing the interface membrane with a high elastic modulus(5.58 mN/m),which may constrain occurrence and progression of partial coalescence.Tween 60(T60)and Tween 40(T40)exhibited strong interactions with proteins,with the interface film formed by T60 having a high elasticity of up to 7.79 mN/m.However,the highest elasticity interface film formed by orogenic behavior from T60 was not conducive to the interaction between fat crystals and the interfacial proteins during the whipping process.T40 not only helps to stimulate fat crystallization and create interface films with appropriate elastic strength but also plays a role in enhancing foam quality as its concentration rises.This is supported by its rheological properties and microscopic structures.The interface membrane formed by Tween 80(T80)was viscous,leading to a significant partial coalescence but poor foam quality.This study reveals the interaction mechanisms between fat crystallization,interface membrane,partial coalescence,and the structure of aerated emulsions regulated by Tweens. 展开更多
关键词 Interfacial interaction Adsorption property Partial coalescence
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