Static coarsening behavior of equiaxed α phase in Ti-8Al-1Mo-1V alloy  

Ti−8Al−1Mo−1V合金等轴α相的静态粗化行为

作　　者：Xiao-hui SHI Zu-han CAO Zhi-yuan FAN Jürgen ECKERT Jun-wei QIAO 石晓辉;曹祖涵;范智渊;Jürgen ECKERT;乔珺威(太原理工大学材料科学与工程学院,太原030024;Erich Schmid Institute of Materials Science,Austrian Academy of Sciences,LeobenA-8700,Austria;Department of Materials Science,Chair of Materials Physics,Montanuniversität Leoben,LeobenA-8700,Austria)

机构地区：[1]College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China [2]Erich Schmid Institute of Materials Science,Austrian Academy of Sciences,LeobenA-8700,Austria [3]Department of Materials Science,Chair of Materials Physics,Montanuniversität Leoben,LeobenA-8700,Austria

出　　处：《Transactions of Nonferrous Metals Society of China》2021年第6期1628-1640,共13页中国有色金属学报（英文版）

基　　金：financial supports from the China Scholarship Council(No.201906935013);the National Natural Science Foundation of China(No.51801132).

摘　　要：To get a deep understanding of the evolution behavior of equiaxedαphase in Ti−8Al−1Mo−1V alloy during annealing,its static coarsening mechanism was studied based on the calculations of coarsening exponent n and the activation energy forαboundary migration.The result of n=6 indicates a special coarsening mechanism of equiaxedαphase.The activation energy forαboundary migration is calculated to be 138 kJ/mol,which is close to the activation energy for grain growth of pureα-Ti.It is revealed that the coarsening of equiaxedαcan be mainly attributed to the self-diffusion of Ti atoms across theα/αboundaries.Based on the experimental findings,a static coarsening kinetics model of equiaxedαgrains in theα+βfield is established.At last,the effects of the coarsening behavior of equiaxedαon tensile properties were studied.为深入了解Ti−8Al−1Mo−1V钛合金等轴α相在退火过程中的演变行为,基于粗化指数n及α界面迁移激活能的计算对其静态粗化机制进行研究。n=6的结果表明,等轴α相具有特殊的粗化机制。计算得到的α界面迁移激活能为138 kJ/mol,接近纯钛的晶粒长大激活能。这表明等轴α的粗化主要是由钛原子穿越α/α界面的自扩散导致。基于研究结果,建立等轴α相在α+β相区的静态粗化动力学模型。最后,分析等轴α相粗化行为对拉伸性能的影响。

关 键 词：static coarsening KINETICS MODEL tensile properties Ti−8Al−1Mo−1V 

分 类 号：TG146.23[一般工业技术—材料科学与工程]