Journal
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
Volume 60, Issue -, Pages 162-167Publisher
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2020.05.027
Keywords
Mg alloys; Orientation; Nucleation; Quasi-in-situ EBSD; Static recrystallization
Funding
- National Natural Science Foundation of China (NSFC) [51601193]
- State Key Program of National Natural Science of China [51531002]
- National Key Research and Development Program of China [2016YFB0301104]
- National Basic Research Programof China (973 Program) [2013CB632202]
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The study tracked the static recrystallization process of a cold-rolled Mg-Zn-Gd alloy using a quasi-in-situ electron backscatter diffraction method, revealing that the orientation distribution of nuclei is associated with nucleation mechanism. Continuous and discontinuous static recrystallization nuclei have different orientation characteristics.
The static recrystallization process of a cold-rolled Mg-Zn-Gd alloy was tracked by a quasi-in-situ electron backscatter diffraction method to investigate the orientations of nuclei. The results show that orientation distribution of nuclei is associated with nucleation mechanism. The continuous static recrystallization nuclei display similar orientations to the parent grains with TD orientation. Differently, discontinuous static recrystallization nuclei formed within the parent grains (TD-45 degrees orientation) show random orientations and a variety of misorientation angles but preferred axes <<(5)over bar>273> or <<(5)over bar>270>. Interestingly, a special oriented nucleation is found. Discontinuous static recrystallization nuclei originated from boundaries of the parent grain (TD-70 degrees orientation) show concentrated TD orientations in another side due to the preferred misorientation relationship 70 degrees <11<(2)over bar>0> (Sigma 18b). It is speculated that these two special misorientation relationships are related to the dislocation type. (C) 2020 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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