Abstracts The microstructure and corrosion resistance properties of as-cast and homogenized AlFeNiCuCr high entropy alloy prepared via magnetic suspension melting were investigated by XRD, DSC, SEM, EDS and electrochemical impedance spectroscopy test. The as-cast AlFeNiCuCr HEA was composed of grey white matrix, petal-shaped structure and Cu enrichment phase. This three different phases were identified as the ordered B2, disordered BCC and FCC phase, respectively. For the homogenized alloy, the diffraction peaks of Al0.4Fe0.6 was detected, indicating that new phases have been precipitated from the BCC matrix. In comparison to the as-cast alloy, the atomic percentage of Cu content increases from 50.69 to 57.17 at. % at grain boundaries illustrate that homogenization treatment intensifies the element segregation in the copper segregation area. The as-cast alloy exhibits super Vickers hardness of 762 HV which is higher than that reported by others. Following homogenization, the fracture strength increases from 1643 to 1799 MPa. The electrochemical parameters of AlFeNiCuCr system in 3.5 wt% NaCl solution at room temperature demonstrate that the as-cast alloy possesses the best corrosion resistance.

中文翻译：

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铸态均质AlFeNiCuCr高熵合金的显微组织和耐蚀性能

摘要 采用XRD、DSC、SEM、EDS和电化学阻抗谱测试方法研究了磁悬浮熔炼制备的铸态和均质AlFeNiCuCr高熵合金的显微组织和耐腐蚀性能。铸态AlFeNiCuCr HEA由灰白色基体、花瓣状结构和Cu富集相组成。这三个不同的相分别被确定为有序 B2、无序 BCC 和 FCC 相。对于均质合金，检测到 Al0.4Fe0.6 的衍射峰，表明新的相已经从 BCC 基体中析出。与铸态合金相比，Cu 含量的原子百分比从 50.69 at 增加到 57.17 at。晶界处的 % 说明均质化处理加剧了铜偏析区的元素偏析。铸态合金表现出 762 HV 的超维氏硬度，高于其他人报告的硬度。均质化后，断裂强度从 1643 MPa 增加到 1799 MPa。室温下 AlFeNiCuCr 体系在 3.5 wt% NaCl 溶液中的电化学参数表明，铸态合金具有最好的耐腐蚀性。