标题： 难熔高熵合金的热蠕变行为：原子尺度研究 显示英文标题

标题： Thermal creep behavior of refractory high-entropy alloy: an atomistic study

摘要： 难熔高熵合金（RHEA）是一类在极端环境中有潜在应用的有前途的材料，其中主要的失效模式是热蠕变。 因此，这些合金的设计需要了解其微观结构和局部化学分布如何影响蠕变行为。 在本研究中，我们使用机器学习原子间势进行了高保真原子模拟，以探索MoNbTaW RHEA在广泛应力和温度条件下的蠕变行为。 我们对晶粒尺寸和局部化学有序度（LCO）进行了参数化，以研究这两个重要的设计变量的影响，这些变量可以在合金制造过程中进行控制。 我们的研究结果表明，随着晶粒尺寸增大和LCO水平提高，抗蠕变变形的能力得到增强。 本研究强调了在设计用于极端环境应用的RHEAs时，结合其他微观结构特性来利用LCO的重要性。 显示英文摘要

摘要： Refractory high-entropy alloy (RHEA) is a promising class of materials with potential applications in extreme environments, where the dominant failure mode is thermal creep. The design of these alloys, therefore, requires an understanding of how their microstructure and local chemical distribution affect creep behavior. In this study, we performed high-fidelity atomistic simulations using machine-learning interatomic potentials to explore the creep behavior of MoNbTaW RHEA under a wide range of stress and temperature conditions. We parametrized grain size and local chemical order (LCO) to investigate the effects of these two important design variables, which can be controlled during the alloy fabrication process. Our investigation revealed that resistance to creep deformation is enhanced with larger grain size and higher levels of LCO. This study highlights the importance of utilizing LCO in conjunction with other microstructural properties when designing RHEAs for extreme environment applications.