基于层错能理论的室温高塑性镁合金设计  

Room Temperature High-Plasticity Magnesium Alloy Design Based on Stacking Fault Energy Theory

作　　者：冯中学[1] 赵珊 史庆南[1] 易健宏[1] 谭军 Feng Zhongxue;Zhao Shan;Shi Qingnan;Yi Jianhong;Tan Jun(School of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China;School of Materials Science and Engineering,Chongqing University,Chongqing 402560,China)

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093 [2]重庆大学材料科学与工程学院,重庆402560

出　　处：《稀有金属材料与工程》2022年第1期134-142,共9页Rare Metal Materials and Engineering

基　　金：云南省科技厅面上项目(202001AT070041);国家自然科学基金地区科学基金(51861016)。

摘　　要：针对大多数镁合金室温塑性差的关键共性问题,本研究通过镁合金位错特性、层错能对变形机制的影响以及层错能与滑移系临界剪切应力之间的关系等3个方面综述了利用层错能改善镁合金室温塑性的理论与实验依据,在此基础上构建了“层错能-镁合金滑移系临界剪切应力”计算模型,并利用此模型计算了纯镁、Mg-Al、Mg-Zn、Mg-Y合金基面、柱面、锥面位错启动所需临界剪切应力。通过比较Mg合金、纯镁的非基面与基面滑移的临界分切应力差值,分析了Al、Zn、Y 3种固溶元素对镁合金塑性的影响,验证了模型的可靠性。最终确定以降低非基面位错(主要是<c+a>位错)滑移分切应力为导向,选择出合适的合金元素,指导室温高塑性镁合金的成分设计。To overcome the key scientific issues of poor plasticity of most magnesium alloys at room temperature,this study reviewed the theoretical and experimental basis of using stacking fault energy to improve their room temperature plasticity from three aspects:the dislocation characteristics of magnesium alloy,the influence of stacking fault energy on the deformation mechanism,and the relationship between stacking fault energy and critical shear stress of slip system.On this basis,the calculation model of“stacking fault energy-critical shear stress of magnesium alloy slip system”was established.And the critical shear stresses of pure Mg,Mg-Al,Mg-Zn and Mg-Y alloys at base plane,prismatic plane and pyramidal plane were calculated using this model.The influences of Al,Zn and Y on the plasticity of Mg alloys were analyzed by comparing the critical shear stress difference between the slip system of non-base plane and base plane of Mg alloy and pure Mg,so as to verify the reliability of the model.Finally,we proposed to reduce the slip shear stress of non-base plane dislocations(especially the<c+a>dislocations)as a guideline to select appropriate alloy elements for the design of high plasticity magnesium alloys at room temperature.

关 键 词：镁合金 层错能 滑移系临界分切应力 位错 力学性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程]