Abstract The effect of Cr content on the microstructure and mechanical properties of CrxFeNiCu high entropy alloys (HEAs) was firstly studied by first-principles calculations. The calculated results show that the hardness of the alloys increased with the expense of its plasticity decrease, if the content of Cr in the alloy increased. In order to verify the calculated results, CrxFeNiCu (x = 0.8, 1, 1.5 and 2) high entropy alloys were synthesized by vacuum induction melting in the present study. The results show that as the value of x increased from 0.8 to 2, the crystal structure changed from single phase face centered cubic (FCC) phase to a mixture of FCC and body centered cubic (BCC) phases. For the single phase FCC (x = 0.8) structure, both the tensile strength and hardness values were low, which were 491.6 MPa and 322.2 HV respectively, however, the plasticity was high, reaching 33.2%. With the formation and growth of BCC phase (x = 2) the tensile strength and hardness of the alloy were significantly improved, which were 872.6 MPa and 808 HV, respectively.

中文翻译：

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Cr含量对CrxFeNiCu高熵合金组织和力学性能的影响

摘要 首次通过第一性原理计算研究了Cr含量对CrxFeNiCu高熵合金(HEAs)组织和力学性能的影响。计算结果表明，随着合金中Cr含量的增加，合金的硬度增加，但塑性降低。为了验证计算结果，本研究通过真空感应熔炼合成了 CrxFeNiCu（x = 0.8、1、1.5 和 2）高熵合金。结果表明，随着 x 值从 0.8 增加到 2，晶体结构从单相面心立方 (FCC) 相变为 FCC 和体心立方 (BCC) 相的混合物。对于单相 FCC (x = 0.8) 结构，拉伸强度和硬度值都较低，分别为 491.6 MPa 和 322.2 HV，然而，可塑性很高，达到了 33.2%。随着 BCC 相的形成和生长（x = 2），合金的抗拉强度和硬度显着提高，分别为 872.6 MPa 和 808 HV。