摘要
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。
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.
作者
石晓辉
曹祖涵
范智渊
Jürgen ECKERT
乔珺威
Xiao-hui SHI;Zu-han CAO;Zhi-yuan FAN;Jürgen ECKERT;Jun-wei QIAO(College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China;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)
基金
financial supports from the China Scholarship Council(No.201906935013)
the National Natural Science Foundation of China(No.51801132).
