Evolution of deformation heterogeneity at multiple length scales in a strongly textured zinc layer on galvanized steel

17th International Conference on Textures of Materials

材料科学;物理学

Ghosh, A.^1,2 ; Gurao, N.P.^2

Department of Materials Science and Engineering, Indian Institute of Technology Kanpur, Kanpur

208 016, India^1

Indian and National Institute of Technology Durgapur, India^2

关键词: Characterization techniques;    Characterization tools;    Deformation heterogeneities;    Different length scale;    Digital image correlations;    Electron back scatter diffraction;    Galvanized steels;    Micro-length scale;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/82/1/012024/pdf
DOI  :  10.1088/1757-899X/82/1/012024

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The evolution of heterogeneity of plastic deformation in a zinc layer has been probed at multiple length scales using a battery of characterization tools like X-ray diffraction, electron back scatter diffraction (EBSD) and digital image correlation. The experimental results indicate that plastic deformation is heterogeneous at different length scales and the value of micro, meso and macro strain by different characterization techniques shows a different value. The value of strain determined at the meso and micro length scale from EBSD and X-ray diffraction was negligible, however, the macro-strain as determined from X-ray peak shift was significant. EBSD results showed evidence of profuse {1012}contraction twinning in the zinc layer with higher intragranular misorientation in the twin compared to the matrix. It is therefore, inferred that the evolution of higher intergranular (between matrix and twin) strain due to prolific contraction twinning contributes to the failure of zinc layer on galvanized steel.