Ti-39Nb合金变形行为的原位同步辐射X射线衍射研究  

In situ synchrotron X-ray diffraction study of deformation behavior of Ti39Nb alloy

作　　者：孟庆坤[1,2,5] 梅碧舟 张盼 戚继球 隋艳伟[1] 郭顺[4] MENG Qing-kun;MEI Bi-zhou;ZHANG Pan;QI Ji-qiu;SUI Yan-wei;GUO Shun(School of Materials Science and Physics,China University of Mining and Technology,Xuzhou 221116,China;Zhejiang Yiduan Precision Machinery Co.,Ltd.,Ningbo 315702,China;Beijing Spacecraft Manufacturing Factory Co.,Ltd.,Beijing 100094,China;School of Materials Science and Engineering,Jiangsu University,Zhenjiang 212013,China;School of Chemical Engineering and Technology,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[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

出　　处：《中国有色金属学报》2022年第3期845-855,共11页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(51601217,51771082,51971241);中国矿业大学大型仪器设备开放共享基金资助项目(DYGX-2021-023)。

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<110>β晶向平行于加载方向的β相晶粒最先发生SIMT,且产生最大相变应变的马氏体变体优先形成。In this paper,the nonlinear elastic deformation behavior of a metastableβ-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 Ti39Nb 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 theβgrains with<110>βparallel to the loading direction and the variants that give the maximum strain are preferentially formed.

关 键 词：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 

分 类 号：TG146.2[一般工业技术—材料科学与工程]