Residual strain orientation in rolled titanium determined with synchrotron X-ray Laue microdiffraction
Residual strain orientation in rolled titanium determined with synchrotron X-ray Laue microdiffraction
复制标题
用同步加速器 X 射线劳厄微衍射测定轧制钛的残余应变方向
DOI：
10.1107/s1600576722011311
复制
发表时间：
2023
影响因子：
6.1
通讯作者：
Wenk, Hans-Rudolf
中科院分区：
文献类型：
--
作者：
Devoe, Michelle;Tamura, Nobumichi;Wenk, Hans-Rudolf
在此之前，同步加速器x射线劳厄微衍射已被用于测量材料中残余应变的大小。近年来提出了确定应变椭球方向的方法，并应用于自然变形石英岩；然而，由于这些石英岩的自然成因，其变形历史是模糊的。在这项研究中，首次使用同步加速器x射线劳厄微衍射（µXRD）来测量具有已知应力历史的轧制钛样品的残余应变。从轧制钛板在不同样品方向上的两次微XRD扫描收集的每个劳厄衍射图像中计算出偏差应变张量。主应变轴是用偏应变张量的本征分解来计算的。结果表明：压缩主轴与钛板法向一致，拉伸主轴与轧制方向一致；极点图用于表示残余应变轴的三维分布。
Previously, synchrotron X-ray Laue microdiffraction has been used to measure the magnitudes of residual strain in materials. Recently the method was advanced to determine the orientation of the strain ellipsoid and applied to naturally deformed quartzites; however, the deformation history of these quartzites is ambiguous due to their natural origin. In this study, synchrotron X-ray Laue microdiffraction (µXRD) is used to measure the residual strain for the first time in a sample with known stress history, rolled titanium. A deviatoric strain tensor is calculated from each Laue diffraction image collected with two µXRD scans of a rolled titanium sheet in different sample orientations. The principal strain axes are calculated using an eigen decomposition of the deviatoric strain tensors. The results show that the principal axis of compression is aligned with the normal direction of the titanium sheet, and the principal axis of extension is aligned with the rolling direction. Pole figures are used to represent the 3D distribution of residual strain axes.