Precipitates evolution in the heat affected zone of Mg-Gd-Y-Zr alloy in T6 condition during laser welding

The precipitates evolution in the heat affected zone of laser-welded Mg-Gd-Y-Zr alloy in T6 condition was investigated based on the TEM observation. Some oval and long-rod shape precipitates along [21¯1¯0]α were observed, which were not involved in precipitation sequence. Compared with isothermal ag...

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Bibliographic Details
Published in:Materials characterization 2019-08, Vol.154, p.386-394
Main Authors: Wang, Lyuyuan, Huang, Jian, Peng, Yong, Wu, Yixiong
Format: Article
Language:English
Subjects:
Heat affected zone
Laser welding
Mg-Gd-Y-Zr alloys
Precipitates evolution
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Summary:The precipitates evolution in the heat affected zone of laser-welded Mg-Gd-Y-Zr alloy in T6 condition was investigated based on the TEM observation. Some oval and long-rod shape precipitates along [21¯1¯0]α were observed, which were not involved in precipitation sequence. Compared with isothermal aged precipitates, the overaged β′ phase presented same morphology and size, while size of needle-shape β became much smaller. The width of complete dissolution zone of the β′ is smaller than that of partial dissolution and transformation zone. •Some oval and long-rod shape precipitates along [21¯1¯0]α were observed in the HAZ.•Some overaged β' phase can be precipitated in the HAZ.•The size of needle-shape β in the HAZ became much smaller, compared with isothermal aged precipitates.
ISSN:1044-5803
1873-4189
DOI:10.1016/j.matchar.2019.06.004