摘要
采用有限元仿真和实验相结合的方法对AZ31镁合金等通道转角挤压过程进行研究,确定了优化后的模具型腔形状和合理的工艺参数,为ECAE研究提供了可靠的理论参考和工艺方案。对挤压试样进行了X射线衍射分析,结果表明,ECAE是一个非均匀的剧烈塑性变形过程,产生剧烈塑性变形的主要形式为位错滑移。随着变形的不断累积,镁合金挤压件中的位错不断增殖,逐渐产生位错线,最终晶界增多,晶粒细化。同时进行了力学测试分析,得到了多道次ECAE试样的力学性能分布规律,结合有限元分析结果,在AZ31镁合金多次ECAE中,选择优化的模具型腔几何形状、合理的工艺参数和挤压线路可以避免挤压试样的变形不均匀性。
Equal channel angular extrusion( ECAE) process of AZ31 magnesium alloy was studied by finite element simulation and experiment. The optimized die cavity geometry and suitable process parameters are determined,which provides reliable theoretical reference and process scheme. X-ray diffraction analysis of the extruded sample was carried out. The results show that ECAE is a non-uniform severe plastic deformation process,and the main form of producing severe plastic deformation is dislocation slip. With the accumulation of deformation,the dislocations in magnesium alloy extrusion parts propagate constantly,and the dislocation line generates gradually. Finally,the grain boundaries increase and grains are refined. At the same time,the mechanical test analysis was carried out,and the mechanical property distribution of multi-pass ECAE sample was obtained. Combined with the results of finite element analysis,in the multipass ECAE process of AZ31 magnesium alloy,the deformation non-uniformity of the extruded samples can be avoided by selecting the optimized die cavity geometry,suitable process parameters and extrusion routes.
作者
徐淑波
刘建营
任国成
景财年
刘鹏
XU Shu-bo;LIU Jian-ying;REN Guo-cheng;JING Cai-nian;LIU Peng(School of Materials Science and Engineering,Shandong Jianzhu University,Jinan 250101,China;National Engineering Research Center of Near-net shape Forming for Metallic Materials,South China University of Technology,Guangzhou 510640,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2021年第6期160-166,共7页
Journal of Plasticity Engineering
基金
国家自然科学基金资助项目(41305124)
山东省重点研发计划项目(2017GGX30128)
2019年山东省新旧动能转换重大课题攻关项目。
关键词
等通道转角挤压
超细晶粒
有限元分析
硬度分析
X射线衍射分析
equal channel angular extrusion
ultra-fine grains
finite element analysis
hardness analysis
X-ray diffraction analysis
