(1. 中国矿业大学材料与物理学院，徐州 221116；
2. 浙江易锻精密机械有限公司，宁波 315702；
3. 北京卫星制造厂有限公司，北京 100094；
4. 江苏大学材料科学与工程学院，镇江 212013；
5. 中国矿业大学化工学院，徐州 221116)
摘 要: 本文利用原位同步辐射X射线衍射(SXRD)技术研究了一种亚稳β型Ti-39Nb合金的非线弹性变形行为。结果表明：当外加应力超过60 MPa时，合金开始出现非线弹性变形，此时合金发生应力诱发马氏体相变(SIMT)。因此，Ti-39Nb合金的非线弹性变形机制为SIMT。此外，加载过程中产生的马氏体衍射峰只出现在同步辐射衍射环的特定角度，即与加载方向成26.5°。这是因为
关键字: 钛合金；应力诱发马氏体相变；同步辐射X射线衍射；非线弹性
（1. School of Materials Science and Physics, China University of
Mining and Technology, Xuzhou 221116, China;
2. Zhejiang Yiduan Precision Machinery Co., Ltd.,
Ningbo 315702, China;
3. Beijing Spacecraft Manufacturing Factory Co.,
Ltd., Beijing 100094, China;
4. School of Materials Science and Engineering,
Jiangsu University, Zhenjiang 212013, China;
5. School of Chemical Engineering and Technology,
China University of Mining and Technology,Xuzhou 221116, China）
Abstract:In this paper, the nonlinear elastic deformation behavior of a metastable β-type Ti-39Nb alloy was studied by in situ synchrotron X-ray diffraction (SXRD) technique. The results indicate that the onset of the nonlinear elastic deformation appears at an applied stress higher than 60 MPa, and stress-induced martensitic transformation (SIMT) occurs simultaneously. As a result, the nonlinear elastic deformation behavior of the Ti-39Nb alloy could be attributed to the SIMT mechanism. Besides, the diffraction peaks of martensite appeared at specific azimuth angles of the SXRD rings initially, i.e., 26.5° from the loading direction. This is because that SIMT will firstly occur in the β grains with
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