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Observation of Twin Transmission Process in Mg Alloys by In Situ EBSD
Author(s) -
Guo Changfa,
Xin Renlong,
Wu Guilin,
Liu Feiya,
Hu Guangshan,
Liu Qing
Publication year - 2019
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201801340
Subject(s) - electron backscatter diffraction , materials science , nucleation , crystal twinning , crystallography , deformation bands , shear (geology) , transmission electron microscopy , deformation mechanism , in situ , deformation (meteorology) , metallurgy , diffraction , composite material , microstructure , optics , nanotechnology , thermodynamics , chemistry , physics , organic chemistry
Twin pairs are frequently observed at the common grain boundaries of Mg alloys. The formation of twin pairs is associated with a twin transmission (TT) process. Investigating the TT process is important for understanding the deformation mechanism of Mg alloys. Here, the authors report an in situ electron backscatter diffraction (EBSD) examination on the TT process in AZ31 Mg alloys subjected to tensile deformation. TT process is clearly observed by band contrast images resulting in the formation of twin chains as strain increases. Interestingly, transmitted twins are developed in advance in form of non‐indexing dislocations or twins in neighboring grain. The TT direction is roughly along the shear plane normal or shear direction of the paired twins. In addition, multiple twin variants are activated by TT mechanism and nucleation of new twins at pre‐existing twin boundaries.