摘要
较低的室温塑性和变形能力限制了镁合金的工程应用。深入理解其塑性变形机制,并明确合金化、热塑性变形、热处理等手段对于镁合金的增塑作用,是实现镁合金塑性调控的基础。介绍了镁合金的塑性变形机制,并指出镁合金室温塑性差的根本原因在于可启动的位错滑移系数量不满足Von Mises准则。现有的镁合金塑性调控策略大致可以分为内禀塑性以及外禀塑性两类。其中内禀塑性调控策略主要包括降低非基面/基面位错的临界剪切应力比值以及降低合金的层错能、激活非基面滑移系的启动;外禀塑性调控策略包括调控晶粒尺寸、析出相、织构和元素晶界偏聚等,即通过组织特征结构的调控,促进多种位错滑移系的启动。
The low room-temperature plasticity and deformability of magnesium alloys restrict their engineering applica-tions.A deep understanding of their plastic deformation mechanisms,and clarifying the plasticity-enhancing effects of alloying,thermomechanical processing and heat treatment form the foundation for achieving plasticity regulation in magnesium alloys.The plastic deformation mechanisms of magnesium alloys were first introduced,and it is pointed out that the fundamental reason for their poor room-temperature plasticity is the insufficient number of activatable slip systems to meet the Von Mises criterion.Existing plasticity regulation strategies for magnesium alloys can generally be classified into intrinsic plasticity and extrinsic plasticity.Intrinsic plasticity regulation strategies primarily include reducing the critical resolved shear stress ratio between non-basal and basal dislocations and lowering the stacking fault energy to activate non-basal slip systems.Extrinsic plasticity regulation strategies involve controlling grain size,precipitates,texture,and elemental grain boundary segregation,that is promoting the activation of multiple slip systems through the regulation of microstructural features.
作者
郭阳阳
付金龙
范玲玲
刘强
刘溪
李进
GUO Yangyang;FU Jinlong;FAN Lingling;LIU Qiang;LIU Xi;LI Jin(Xi'an Rarealloys Co.,Ltd.,Northwest Institute for Nonferrous Metal Research,Xi'an 710072,China;XI'an Rare Metal Materials Institute Co.,Ltd.,Xi'an 710072,China;School of Mechanical Engineering,Chengdu University,Chengdu 610106,China)
出处
《热加工工艺》
北大核心
2025年第14期197-214,共18页
Hot Working Technology
基金
陕西省自然科学技术研究计划资助项目(2024JC-YBQN-0604)
秦创原引用高层次创新创业人才资助项目(QCYRCXM-2023-020)
四川省科技计划资助项目(2025ZNSFSC1342)
陕西省重点研发计划资助项目(2019GY-159)
陕西省秦创原“科学家+工程师”队伍建设项目(2023KXJ-234)。
关键词
镁合金
塑性
变形机制
位错
孪晶
织构
magnesium alloys
plasticity
deformation mechanisms
dislocation
twinning
texture
