The generalized planar fault energy, ductility, and twinnability of AI and AI-RE （RE = Sc, Y, Dy, Tb, Nd） at different temperatures： A first-principles study

The genearlized planar fault energies of Al and Al-RE （RE = Sc, Y, Dy, Tb, Nd） alloys have been investigated using first-principles methods combined with a quasiharmonic approach. The stacking fault energies, unstable stacking fault energies, and unstable twinning energies decrease slightly with inc...

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Bibliographic Details
Published in:中国物理B：英文版 2014 (6), p.411-416
Main Author: 吴小志 刘利利 王锐 刘庆
Format: Article
Language:English
Subjects:
堆垛层错能
平面
延展性
温度
第一原理
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Summary:The genearlized planar fault energies of Al and Al-RE （RE = Sc, Y, Dy, Tb, Nd） alloys have been investigated using first-principles methods combined with a quasiharmonic approach. The stacking fault energies, unstable stacking fault energies, and unstable twinning energies decrease slightly with increasing temperature. The ductility parameter D, the relative barrier difference Sut, and the twinnability τa of Al and Al-RE alloys at different temperatures have been determined. It is found that the ductilities of Al and Al alloys are nearly the same and the ductilities increase slightly with increasing temperature. The RE alloying elements make twinning more likely and the twinnabilities of Al and Al alloys decrease with increasing temperature.
ISSN:1674-1056
2058-3834