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The role of higher-symmetry phases in anisotropy of theoretical tensile strength of metals and intermetallics

机译:高对称相在金属和金属间化合物理论抗张强度各向异性中的作用

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Fully self-consistent ab initio electronic structure calculation of the theoretical tensile strength of single-crystalline tungsten and NiAl loaded uniaxially along [001] and [111] directions is performed using the full-potential LAPW method. Although tungsten is elastically nearly isotropic (C-44 approximate to C'), theoretical tensile strength exhibits a marked anisotropy. Similarly, in NiAl, the 'hard' orientation [001] differs very significantly from the [111] orientation. This anisotropy is explained in terms of higher-symmetry structures present or absent along the deformation paths. [References: 10]
机译:使用全电势LAPW方法对沿[001]和[111]方向单轴加载的单晶钨和NiAl的理论抗拉强度进行完全自洽的从头算电子结构计算。尽管钨在弹性上几乎各向同性(C-44近似于C'),但理论抗拉强度却表现出明显的各向异性。同样,在NiAl中,“硬”方向[001]与[111]方向非常不同。根据沿变形路径存在或不存在的高对称结构来解释这种各向异性。 [参考:10]

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