Abstract In this work, the evolution of microstructure and fundamental mechanical properties with Mo concentration in the arc-melted (TiZrNbTa)100-xMox (0 ≤ x ≤ 20) high-entropy alloys (HEAs) are investigated. The arc-melted (TiZrNbTa)100-xMox alloys structurally consist of two bcc phases. The change in volume fractions of two phases in the microstructure is insignificant with Mo concentration, at levels of ∼75% for bcc1 and ∼25% for bcc2. The increases in microhardness and Young's modulus of the alloys linearly scale with Mo concentration. To compromise the strength and ductility, the (TiZrNbTa)90Mo10 exhibits an optimal combination of stiffness (E = 137 GPa), compressive yield strength (σy = 1370 MPa) and deformability (ep ≈ 25%). In addition, it is indicated that dislocation widths in bcc lattice of refractory HEAs are insensitive to the alloying complexity, reflecting that the Peierls barrier is excluded as a predominant factor of strengthening. Furthermore, a simple model is proposed to reveal the solid solution hardening (SSH) in bcc refractory HEAs, in which the solid solutions are treated as an imposition of distortion-free and distorted lattices. By applying this model to archived refractory HEAs, the predicted yield strength agrees well with experimentally measured values. It provides a simple empirical tool used for predicting the strength of bcc refractory HEAs and to assist new alloy design.

中文翻译：

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(TiZrNbTa)-Mo 高熵合金：微观结构和机械性能对 Mo 浓度和固溶强化建模的依赖性

摘要 在这项工作中，研究了电弧熔炼 (TiZrNbTa)100-xMox (0 ≤ x ≤ 20) 高熵合金 (HEAs) 中的组织和基本机械性能随 Mo 浓度的演变。电弧熔化的 (TiZrNbTa)100-xMox 合金在结构上由两个 bcc 相组成。微观结构中两相体积分数的变化随 Mo 浓度变化不显着，bcc1 的水平约为 75%，bcc2 的水平约为 25%。合金显微硬度和杨氏模量的增加与 Mo 浓度呈线性关系。为了兼顾强度和延展性，(TiZrNbTa)90Mo10 表现出刚度 (E = 137 GPa)、压缩屈服强度 (σy = 1370 MPa) 和变形性 (ep ≈ 25%) 的最佳组合。此外，表明难熔 HEA 的 bcc 晶格中的位错宽度对合金化复杂性不敏感，这反映了 Peierls 势垒被排除在外作为强化的主要因素。此外，提出了一个简单的模型来揭示 bcc 耐火 HEAs 中的固溶硬化 (SSH)，其中固溶体被视为无畸变和畸变晶格的强加。通过将此模型应用于存档的耐火 HEAs，预测的屈服强度与实验测量值非常吻合。它提供了一个简单的经验工具，用于预测体心立方耐火 HEAs 的强度并协助新合金设计。提出了一个简单的模型来揭示 bcc 耐火 HEAs 中的固溶硬化 (SSH)，其中固溶体被视为无畸变和畸变晶格的强加。通过将此模型应用于存档的耐火 HEAs，预测的屈服强度与实验测量值非常吻合。它提供了一个简单的经验工具，用于预测体心立方耐火 HEAs 的强度并协助新合金设计。提出了一个简单的模型来揭示 bcc 耐火 HEAs 中的固溶硬化 (SSH)，其中固溶体被视为无畸变和畸变晶格的强加。通过将此模型应用于存档的耐火 HEAs，预测的屈服强度与实验测量值非常吻合。它提供了一个简单的经验工具，用于预测体心立方耐火 HEAs 的强度并协助新合金设计。