Measurement of the pattern shifts for HR-EBSD with larger lattice rotations

Wei Li; Yongzhe Wang; Xingui Zhou; Jingchao Xu; Ruyue Zhang; Yi Zeng; Hong Miao

doi:10.1016/j.ultramic.2023.113697

Measurement of the pattern shifts for HR-EBSD with larger lattice rotations

Ultramicroscopy. 2023 May:247:113697. doi: 10.1016/j.ultramic.2023.113697. Epub 2023 Feb 6.

Authors

Wei Li¹, Yongzhe Wang², Xingui Zhou³, Jingchao Xu¹, Ruyue Zhang¹, Yi Zeng², Hong Miao⁴

Affiliations

¹ CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China, Hefei 230027, China.
² The State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Science, Shanghai 200050, China; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China.
³ CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China, Hefei 230027, China; Anhui Province Key Laboratory of Building Structure and Undergound Engineering, Anhui Jianzhu University, Hefei 230601, China.
⁴ CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China, Hefei 230027, China. Electronic address: miaohong@ustc.edu.cn.

PMID: 36804629
DOI: 10.1016/j.ultramic.2023.113697

Abstract

High-resolution electron backscattering diffraction (HR-EBSD) was used to measure rotations and elastic strains by matching diffraction patterns based on cross-correlation. However, the subset-based phase correlation algorithm was unable to determine pattern shifts accurately when large rotations occurred. In this paper, a new matching algorithm was proposed to measure pattern shifts and recover the elastic strain and lattice rotation with finite deformation theory. The algorithm was implemented in two steps: (a) Integral pixel matching: The pixel-related information of the Kikuchi patterns was mapped to the original three-dimensional sphere to obtain the image projected in parallel by using the feature points as the pattern center through the transformation of its spatial coordinates. The correlation between the images projected in parallel before and after deformation was then obtained. The locations of the integral pixels were determined by the peaks of the surface of correlation obtained by traversing all pixels in the search area. (b) subpixel refinement: the locations of subpixels were obtained by FAGN with an appropriate shape function involving rotation and translation. The algorithm was applied to dynamic simulated test sets, and its results were compared with those of the first-pass cross-correlation and the second-pass cross-correlation method with remapping. The proposed method was more robust in the case of rotation and solved the problem that displacement vectors could not be accurately measured when a larger lattice rotation occurred. The mean errors of the measured displacement, rotation, and strain components were 0.02 pixel, 0.5×10^-4rad, and 1×10^-4, respectively. Compared with the second-pass cross-correlation method, the angle of rotation was more precisely extracted.

Keywords: Cross-correlation; Displacement measurement; HR-EBSD; Large rotation; Strain.