Instability of the O-phase in Ti-22Al-25Nb alloy during elevated-temperature deformation
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- 作者：Peng Lin ; Zhubin He ; Shijian Yuan ; Jun Shen ; Yongjiang Huang ; Xiaobo Liang
- 关键词：Ti2AlNb ; Microstructural instability ; Coarsening ; Fragmentation ; Spheroidization
- 刊名：Journal of Alloys and Compounds
- 出版年：2013
- 出版时间：25 November, 2013
- 年：2013
- 卷：578
- 期：Complete
- 页码：96-102
- 全文大小：2743 K
文摘
The deformation behavior and microstructural evolution of a Ti-22Al-25Nb alloy during tensile deformation at 900 ¡ãC was systematically investigated. The true stress-strain curve exhibited an initial hardening transient, a peak flow stress, and then a flow softening. The alloy exhibited a microstructural instability during the tensile deformation, characterized by coarsening, fragmentation, and spheroidization of the O-phase. This microstructural instability was enhanced by the imposed strain rather than the applied stress. After a strain of ¦Å = 0.56, a refined microstructure with equiaxed or near-equiaxed O-phase grains formed. Based on the results of the microstructural evolution, the origin of the flow softening behavior was suggested.