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First-principles study of Co_3(Al,W) alloys using special quasi-random structures

机译:使用特殊的准随机结构研究Co_3(Al,W)合金的第一性原理

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摘要

We have developed 32-atom special quasi-random structures (SQSs) to model the substitutionally random pseudo-binary A_3(B_(0.5)C_(0.5)) alloys in Ll_2, D0_(19), and D0_3 crystal structures, respectively. First-principles SQS calculations are performed to examine the phase stability of the recently identified Ll_2-Co_3Al_(0.5)W_(0.5) compound in the Co-Al-W ternary system. By computing total energy as a function of applied strain, the single-crystal elastic constants of Ll_2-Co_3Al_(0.5)W_(0.5) are also predicted and our results show excellent agreement with recent experimental measurements.
机译:我们已经开发了32个原子的特殊准随机结构(SQSs),以分别模拟Ll_2,D0_(19)和D0_3晶体结构中的替代随机伪二进制A_3(B_(0.5)C_(0.5))合金。进行第一性原理SQS计算以检查在Co-Al-W三元体系中最近鉴定的Ll_2-Co_3Al_(0.5)W_(0.5)化合物的相稳定性。通过计算作为施加应变的函数的总能量,还可以预测Ll_2-Co_3Al_(0.5)W_(0.5)的单晶弹性常数,我们的结果与最近的实验测量结果非常吻合。

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