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An alternative DFT-based model for calculating structural and elastic properties of random binary HCP, FCC and BCC alloys: Mg-Li system as test case

机译:用于计算随机二元HCP,FCC和BCC合金的结构和弹性特性的基于DFT的替代模型:Mg-Li系统作为测试案例

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摘要

Density functional theory based ab-initio total energy calculations are used to determine the concentration dependences of equilibrium lattice parameters, densities, mixing energies (phase stability) and elastic constants of binary random Mg_(1-x)Li_x alloys spanning the entire concentration range, in the HCP, FCC and BCC structures. A model for predicting phase stability and elastic properties of random alloys is proposed. The current model is applied to binary Mg-Li system as a test study. The predicted phase stability trends at 0 K resemble those observed experimentally in Mg—Li phase diagram, more especially at lower temperatures. The proposed model for random alloys is not only accurate but also less computationally expensive compared to traditional supercell approach.
机译:基于密度泛函理论的从头算总能量计算来确定在整个浓度范围内的二元无规Mg_(1-x)Li_x合金的平衡晶格参数,密度,混合能(相稳定性)和弹性常数的浓度依赖性,在HCP,FCC和BCC结构中。提出了一种预测无规合金相稳定性和弹性性能的模型。目前的模型已应用于二元Mg-Li系统作为测试研究。在0 K时预测的相稳定性趋势类似于在Mg-Li相图中实验观察到的趋势,尤其是在较低温度下。与传统的超级电池方法相比,所提出的无规合金模型不仅准确,而且计算成本更低。

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