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 no. 6; pp. 411 - 416
Main Author 吴小志 刘利利 王锐 刘庆
Format Journal Article
LanguageEnglish
Published 2014
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.
Bibliography:Wu Xiao-Zhi, Liu Li-Li, Wang Rui, Liu Qing （ a） College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China b）National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China c） College of Physics and Institute for Structure and Function, Chongqing University, Chongqing 401331, China
11-5639/O4
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.
twinnability, temperature, generalized planar fault energy
ISSN:1674-1056
2058-3834