Growth twinning behavior of cast Mg–Zn–Cu–Zr alloys
2014
Abstract The morphology and orientation of the growth twins formed in the cast Mg–Zn–Cu–Zr alloys aged at 100 °C were characterized using optical microscopy and transmission electron microscopy. It was found that twins were invisible in the as-cast or solutionized Mg–Zn–Cu–Zr alloys while
{ 10 1 ¯ 2 } twins were exclusively formed in the aged condition. The twinning behavior was significantly affected by two factors, namely, the Zn content and the heat treatment process. A possible formation mechanism of such growth twins was discussed using the viewpoint of vacancy.
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