晶界对γ-TiAl多晶体压缩性能影响的晶体塑性有限元模拟  

Crystal plastic finite element simulation of effects of grain boundary on compression property ofγ-TiAl polycrystal

作　　者：张娜 张平则[1,2] 魏东博 殷姿[1] 汪诗园 丁丰 ZHANG Na;ZHANG Ping-ze;WEI Dong-bo;YIN Zi;WANG Shi-yuan;DING Feng(College of Materials Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China;Key Laloratory of Materials Preparation and Protection for Harsh Environment,Ministry of lndustry and Information Technology,Nanjing 211106,China;Key Laboratory of Aero Engine Thermal Environment and Thermal Structure,Ministry of Industry and Information Technology,Nanjing 210016,China)

机构地区：[1]南京航空航天大学材料科学与技术学院,江苏南京211106 [2]面向苛刻环境的材料制备与防护技术工业和信息化部重点实验室,江苏南京211106 [3]航空发动机热环境与热结构工业和信息化部重点实验室,江苏南京210016

出　　处：《塑性工程学报》2020年第10期100-110,共11页Journal of Plasticity Engineering

基　　金：江苏省自然科学基金-优秀青年基金资助项目(BK20180068);中国博士后科学基金资助项目(2018M630555)。

摘　　要：采用三维Voronoi方法建立了γ-Ti Al多晶体模型,利用晶体塑性有限元模拟研究了含5种相对取向晶界:Σ3(111)60°、Σ5(210)36.9°、Σ9(221)90°、Σ11(311)50.5°和Σ13a(320)22.6°的γ-Ti Al多晶体压缩变形行为。模拟结果表明,晶界影响多晶体压缩时的应力分布情况和滑移系启动情况。Σ3(111)60°和Σ11(311)50.5°晶界处出现较明显的应力集中现象,晶界处启动的滑移系数量较少,且均为超滑移系。Σ5(210)36.9°、Σ9(221)90°和Σ13a(320)22.6°晶界处没有明显的晶界集中,Σ5(210)36.9°和Σ13a(320)22.6°晶界处有普通滑移系启动,Σ9(221)90°晶界处启动的滑移系数量最多。研究表明,Σ3(111)60°和Σ11(311)50.5°晶界不利于γ-Ti Al多晶体的塑性变形,Σ5(210)36.9°、Σ9(221)90°和Σ13a(320)22.6°晶界对于γ-Ti Al多晶体的塑性变形更为有利。Theγ-Ti Al polycrystal model was established by three-dimensional Voronoi method,and the compression deformation behaviour ofγ-Ti Al polycrystal with grain boundaries with five kinds of relative orientations,namelyΣ3(111)60°,Σ5(210)36.9°,Σ9(221)90°,Σ11(311)50.5°andΣ13 a(320)22.6°,was studied by crystal plastic finite element simulation.The simulation results show that the grain boundary affects the stress distribution and the slip system startup during the compression of polycrystal.There is obvious stress concentration phenomena at the grain boundaries ofΣ3(111)60°andΣ11(311)50.5°.The amount of slip system initiated at the two grain boundaries is small and all are super-slip systems.There are no obvious grain boundary concentrations at the grain boundaries ofΣ5(210)36.9°,Σ9(221)90°andΣ13 a(320)22.6°,atΣ5(210)36.9°andΣ13 a(320)22.6°grain boundary,the common slip systems are initiated,and the amount of slip system initiated atΣ9(221)90°grain boundary is the highest.The analysis shows that theΣ3(111)60°andΣ11(311)50.5°grain boundaries are not conducive to the plastic deformation ofγ-Ti Al polycrystals,Σ5(210)36.9°,Σ9(221)90°andΣ13 a(320)22.6°grain boundaries are more advantageous for the plastic deformation ofγ-Ti Al polycrystals.

关 键 词：晶体塑性有限元 γ-TiAl多晶体 压缩性能 滑移系 晶界 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]