About this Abstract |
Meeting |
12th International Conference on Magnesium Alloys and their Applications (Mg2021)
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Symposium
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12th International Conference on Magnesium Alloys and their Applications (Mg 2021)
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Presentation Title |
On the Precipitation Evolution in a Mg-0.3Ca-0.6Zn Alloy |
Author(s) |
Zehao Li, Taisuke Sasaki, Du Chen, Kang Wang, Bi-cheng Zhou, Kazuhiro Hono |
On-Site Speaker (Planned) |
Zehao Li |
Abstract Scope |
Age-hardenable Mg-Ca-Zn alloys are promising candidates as heat-treatable wrought alloys because of their excellent room temperature formability and high strength. This work aims at establishing a detailed precipitation sequence in the Mg-0.3Ca-0.6Zn (at.%) alloy by (S)TEM and 3DAP analysis. The monoatomic layer Guinier Preston (G.P.) zone is found to be the main strengthening phase in the peak-aged condition. The G.P. zones are thickened to the tri-atomic layer η'' and η' phases. The η'' and η' basal plates then form in pairs and get clustered upon aging followed by the transformation into η1 and η2 phases. 1000 h aging leads to the precipitation of two equilibrium phases, η, and δ. These observations have established the following precipitation sequence; S.S.S.S → solute clusters → G.P. zones→η''→η'→η1, η2 →η, δ. The structural stability of the G.P. zones and precipitates are verified by DFT calculations. |
Proceedings Inclusion? |
Planned: At-meeting proceedings |