弹性各向异性对模型合金析出相演变影响的微观相场研究  

Microscopic Phase-field Study on Influence of Elastic Anisotropy on Evolution of Precipitated Phases in Model Alloys

作　　者：刘振智 赵彦[1] 鲁晓刚[1] 刘闯 许斌[2] 宋丹戎[2] LIU Zhenzhi;ZHAO Yan;LU Xiaogang;LIU Chuang;XU Bin;SONG Danrong(School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China;Nuclear Power Institute of China, Chengdu Sichuan 610014, China)

机构地区：[1]上海大学材料科学与工程学院,上海200444 [2]中国核动力研究设计院,四川成都610014

出　　处：《上海金属》2021年第1期106-112,共7页Shanghai Metals

基　　金：国防科技工业核动力技术创新中心项目(No.HDLCXZX-2019-HD-32-01)。

摘　　要：通过相场法研究了弹性各向异性对模型合金析出相演变的影响,并与试验结果进行了对比。研究表明:当各向异性常数δ>1时,析出相为立方状,相界面平行于立方晶系的<100>方向,在晶格错配引起的弹性力场作用下,析出相发生劈裂,且随着弹性能的增大,劈裂源增多,劈裂相形状复杂;各向异性常数δ<1时,析出相为沿轴心旋转45°的立方状,在较大弹性力场作用下,二次相析出并长大。Effect of elastic anisotropy on the evolution of precipitated phases in the model alloy was studied by a phase-field method and compared with the experimental results.The results showed that when the anisotropic parameterδwas more than 1,the shape of precipitated phases was cubic,and their interface was parallel to the<100>direction of acubic crystal;under the action of the elastic field caused by the lattice mismatch,the precipitated phase split,and with the increase of elastic energy,the number of split sources increased,and shape of the split phase was various.When the anisotropic parameterδwas less than 1,the precipitated phase was cubic and rotated 45°along the axis,and the secondary phase precipitated and coarsened under the action of larger elastic field.

关 键 词：弹性各向异性 相场 劈裂 二次析出 

分 类 号：TG1[金属学及工艺—金属学]