Dynamic microstructural changes in Mg–9Al–1Zn alloy during hot compression

Twin dynamic recrystallization (DRX) occurs during the hot compression of AZ91 alloy with precipitation of Mg 17Al 12 phase at the newly formed DRXed grain boundaries. The pinning effect of the Mg 17Al 12 precipitates is greatly influenced by compression temperature, resulting in compression tempera...

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Bibliographic Details
Published in:Scripta materialia 2009-08, Vol.61 (3), p.249-252
Main Authors: Xu, S.W., Matsumoto, N., Kamado, S., Honma, T., Kojima, Y.
Format: Article
Language:English
Subjects:
AZ91 alloy
Dynamic recrystallization
Mg 17Al 12 precipitate
Pinning effect
Zener–Holloman parameter
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Summary:Twin dynamic recrystallization (DRX) occurs during the hot compression of AZ91 alloy with precipitation of Mg 17Al 12 phase at the newly formed DRXed grain boundaries. The pinning effect of the Mg 17Al 12 precipitates is greatly influenced by compression temperature, resulting in compression temperature having a stronger influence than strain rate on DRXed grain size. The conventional relationship between DRXed grain size and the Zener–Hollomon parameter breaks down as the pinning effect of the precipitates is not taken fully into consideration.
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2009.03.051