Incorporating light elements into refractory high-entropy alloys (RHEAs) has been extensively studied to reduce density while maintaining strength. The equiatomic MoV alloy, composed of common RHEA constituents, is promising for forming an isomorphous solid solution and avoiding brittle intermetallic compounds. This study investigates the effects of Al on the equiatomic MoV alloy by fabricating and analyzing MoV, Al₁₅MoV, Al₃₃MoV, and Al₅₀MoV alloys. The crystal structures of MoV, Al₁₅MoV, and Al₃₃MoV were body-centered cubic, while secondary phases were observed in Al₅₀MoV. The Al₁₅MoV and Al₃₃MoV alloys demonstrated higher yield strengths than MoV, despite the addition of soft Al. Notably, the Al₁₅MoV alloy exhibited the best combination of strength and ductility among designed alloys, with a compressive strength of ~1273 MPa and a ductility of ~13%. The primary strengthening mechanism was solid solution strengthening, induced by the significant shear modulus misfit of Al atoms with Mo and V. These novel Al-Mo-V medium-entropy alloys represent a significant advancement in developing lighter RHEAs without compromising mechanical properties, offering a new direction for future RHEA design.

中文翻译：

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AlxMoV 中熵合金的合金设计和微观结构


将轻元素掺入难熔高熵合金 （RHEA） 中已被广泛研究，以降低密度同时保持强度。由常见的 RHEA 成分组成的等原子 MoV 合金有望形成同晶固溶体并避免脆性金属间化合物。本研究通过制备和分析 MoV、Al₁₅MoV、Al₃₃MoV 和 Al₅₀MoV 合金，研究了 Al 对等原子 MoV 合金的影响。MoV、Al₁₅MoV 和 Al₃₃MoV 的晶体结构是体心立方，而在 Al₅₀MoV 中观察到第二相。尽管添加了软铝，但 Al₁₅MoV 和 Al₃₃MoV 合金表现出比 MoV 更高的屈服强度。值得注意的是，Al₁₅MoV 合金在设计合金中表现出强度和延展性的最佳组合，抗压强度为 ~1273MPa，延展性为 ~13%。主要强化机制是固溶体强化，由 Al 原子与 Mo 和 V 的显著剪切模量失配诱导。这些新颖的 Al-Mo-V 中等熵合金代表了在不影响机械性能的情况下开发更轻的 RHEA 的重大进步，为未来的 RHEA 设计提供了新的方向。