ABSTRACT

In the present study, the intelligent addition of Re and Al to TiZrHf equiatomic ternary alloy resulted in a new single-phase Ti₃₀Zr₃₀Hf₃₀Re₅Al₅ HCP high entropy alloy. The XRD analyses show that the TiZrHfRe_x alloys have a single-phase HCP structure until x = 5 at.%. Subsequently, the TiZrHfRe₅ retains its single-phase HCP microstructure with the addition of Al upto 5 at.%, leading to a new quinary TiZrHfRe₅Al₅ HCP HEA. Microstructural investigations using SEM revealed the formation of compositionally homogeneous single-phase HCP solid solution for TiZrHf, TiZrHfRe₅ and TiZrHfRe₅Al₅ alloys. Vicker's microindentation measurements revealed that adding Re, followed by Al, increases the hardness of the TiZrHf ternary alloy from 7.85$\pm$0.37–8.35$\pm$0.42 GPa. In a nutshell, a novel quinary HCP alloy was developed based on transition metals, allowing HCP HEA compositional space to expand beyond rare-earth (RE) based HEAs.

摘要

在本研究中，将 Re 和 Al 智能添加到 TiZrHf 等原子三元合金中，产生了一种新的单相 Ti ₃₀ Zr ₃₀ Hf ₃₀ Re ₅ Al ₅ HCP 高熵合金。XRD 分析表明，TiZrHfRe _x合金具有单相 HCP 结构，直到 x = 5 at.%。随后，TiZrHfRe ₅保留了其单相 HCP 微观结构，并添加了高达 5 at.% 的 Al，从而产生了新的五元 TiZrHfRe ₅ Al ₅ HCP HEA。_{使用 SEM 进行的微观结构研究表明，TiZrHf、TiZrHfRe 5}和 TiZrHfRe形成了成分均匀的单相 HCP 固溶体₅ Al ₅合金。Vicker 的显微压痕测量表明，添加 Re，然后添加 Al，将 TiZrHf 三元合金的硬度从 7.85 提高$\pm$0.37–8.35$\pm$0.42 帕。简而言之，一种基于过渡金属的新型五元 HCP 合金被开发出来，使 HCP HEA 的组成空间扩展到稀土 (RE) 基 HEA 之外。