ABSTRACT A study of novel composite-structured CoCrFeNi3Si, CoCrFe2Ni2Si and Co2CrFeNi2Si high-entropy alloys, synthesised by vacuum arc melting, is presented. The designing criteria for the formation of such alloys were based on the enthalpy of mixing and the valence electron concentration. X-ray diffraction analysis revealed that all the alloys were composed of face-centered cubic and intermetallic phases. Scanning electron microscopy, along with elemental analysis, indicated that the face-centered cubic phase mainly contains Co, Cr, Fe and Ni, whereas, the intermetallic compound is Ni-Si rich. All the synthesised high-entropy alloys in the present investigation possess excellent compressive strength along with ductility at room temperature, suggesting significant potential application in the engineering field. Furthermore, enhanced hardness, wear resistance and corrosion resistance were achieved in all the designed high-entropy alloys. The previously given design parameters for the composite-structured high-entropy alloys are in good accord with the current research work.

中文翻译：

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新型复合结构高熵合金的合成与表征

摘要 对真空电弧熔炼合成的新型复合结构 CoCrFeNi3Si、CoCrFe2Ni2Si 和 Co2CrFeNi2Si 高熵合金进行了研究。形成这种合金的设计标准是基于混合焓和价电子浓度。X射线衍射分析表明，所有合金均由面心立方相和金属间相组成。扫描电子显微镜和元素分析表明，面心立方相主要含有 Co、Cr、Fe 和 Ni，而金属间化合物富含 Ni-Si。本研究中所有合成的高熵合金在室温下均具有优异的抗压强度和延展性，表明在工程领域具有重要的潜在应用。此外，提高硬度，所有设计的高熵合金都达到了耐磨性和耐腐蚀性。先前给出的复合结构高熵合金的设计参数与当前的研究工作非常吻合。