ABSTRACT The AlCrCuFeZn multi-component high entropy alloy was synthesised by mechanical alloying and spark plasma sintering (SPS). Alloying behaviour, microstructure and phase stability were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and differential scanning calorimetry (DSC). In the metastable as-milled condition, two disordered body centred cubic (BCC) phases were observed with crystallite size less than 40 nm. SPS was efficient in obtaining high densification, 91%, in the sintered condition. The structural evolution during the sintering occurred by the formation of two stable phases, one enriched in CuZn with Cu5Zn8-type structure, and another enriched in FeAlCr with a BCC structure. High hardness of 661 and 627 HV was obtained in the as-milled powder and SPS sintered sample, respectively.

中文翻译：

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AlCrCuFeZn高熵合金的机械合金化和放电等离子烧结

摘要 采用机械合金化和放电等离子烧结 (SPS) 合成了 AlCrCuFeZn 多组分高熵合金。通过 X 射线衍射 (XRD)、扫描电子显微镜 (SEM) 和差示扫描量热法 (DSC) 研究合金行为、微观结构和相稳定性。在亚稳态研磨条件下，观察到两个无序的体心立方 (BCC) 相，晶粒尺寸小于 40 nm。SPS 在烧结条件下可有效获得 91% 的高致密化。烧结过程中的结构演变通过形成两个稳定相而发生，一个富含 CuZn 具有 Cu5Zn8 型结构，另一个富含 FeAlCr 并具有 BCC 结构。在研磨后的粉末和 SPS 烧结样品中分别获得了 661 和 627 HV 的高硬度。