Macro-micro behaviors of Ti-22Al-26Nb alloy during warm tension
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影响因子：6.1
DOI码：10.1016/j.msea.2022.143580
所属单位：Hefei University of Technology
发表刊物：Materials Science and Engineering A
关键字：Macro-micro behaviors Ti–22Al–26Nb alloy Warm tension Fracture mode Deformation coordination mechanisms
摘要：In this paper, the plastic flow rules and fracture evolution mechanisms of the nearly O + B2 Ti–22Al–26Nb alloy during warm tension have been studied within a wide temperature range of 20–800 ◦C. The macro-micro deformation behaviors of the material have been investigated by means of SEM, EBSD and TEM. It is found that the stress-strain curve at 400 ◦C exhibits serrated patterns, indicating the occurrence of dynamic strain aging at mild temperature. The overall yield strength decreases and the uniform elongation increases with the temperature in general. However, an unexpected peak of yield strength and also an unexpected valley of uniform elongation are exhibited at 600 ◦C. Additionally, the uniform elongation shows a positive correlation with strain rate at 600 ◦C. With the comprehensive analyses of fracture surface characteristics, the morphological variation of the constituent phases and the dislocation structure evolution, the causations of the above phenomena are further explained as follows. The B2 phase is mainly responsible for deformation coordination between O laths with the original {110}B2‖(001)O orientation barely changed, and act as a media for propagating localized slip deformation to O grains. The abnormal mechanical responses at 600 ◦C are mainly attributed to the change of fracture mode caused by the precipitation of fine acicular O grains, while the softening mechanism at 800 ◦C is mainly dominated by the dynamic globularization of the O phase.
合写作者：Miao Meng
第一作者：Xiao-li Zhang
论文类型：期刊论文
通讯作者：Si-liang Yan*,Ping Li
论文编号：143580
学科门类：工学
文献类型：J
卷号：850
期号：-
页面范围：1-13
是否译文：否
发表时间：2022-07-01
收录刊物：SCI、EI
发布期刊链接：https://www.sciencedirect.com/science/article/pii/S0921509322009662?via%3Dihub
附件：
Macro-micro behaviors of Ti-22Al-26Nb alloy during warm tension.pdf