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中文摘要：
采用真空电弧炉熔炼制备了Al0．5FeCoCrNi，Al0.5FeCoCrNiSi0.2和Al0.5FeCoCrNiTi0.5高熵合金（下标均表示摩尔比）。研究了三种高熵合金在900℃空气中的抗氧化性能，并用带有能谱仪的扫描电镜和X射线衍射仪对不同成分高熵合金氧化层的形貌、成分和结构进行了对比分析。结果表明，三种高熵合金在900℃下均属于抗氧化级。Al0．5FeCoCrNi合金和Al0．5FeCoCrNi0.2合金的氧化增重曲线相似，Al0．5FeCoCrNi0.5高熵合金的氧化增重速率较大。Al0．5FeCoCrNi，Al0.5FeCoCrNiSi0.2高熵合金表面均生成Cr2O3氧化物，内部均生成少量A1N颗粒；Al0．5FeCoCrNiTi0.5高熵合金氧化产物为CoFe2O4尖晶石氧化物及富含钛和铁的复杂氧化物，内部产生少量氮化物颗粒。
英文摘要：
High-entropy alloys Al0. 5 FeCoCrNi, A10. 5 CoCrFeNiSi0. 2 and A10. 5 FeCoCrNiTi0. 5 were prepared by the arc melting and casting method （subscript indicats molar ratio）. The oxidation resistance of the three high-entropy alloys at 900℃ were studied. The morphology composition and structures of the oxide scales on alloys were characterized by scanning electron microscopy （SEM） attached with energy dispersive X-ray spectrometer （EDS） and X-ray diffraction （XRD）. The results show that three kinds of high-entropy alloys all belong to the oxidation resistant grade. The oxidation mass gain curves of A10.5 FeCoCrNi and Al0. 5 FeCoCrNiSi0.2 are similar, the velocity of the oxidation mass gains of Al0. 5 FeCoCrNiTi0.5 is faster. The oxides of Al0. 5 FeCoCrNi and A10. 5 FeCoCrNiSi0. 2 Cr2 O3 with a small amount of A1N particles inside; the oxides of high-entropy alloy Al0. 5 FeCoCrNiTi0.5 are complex, there covered CoFe2O4 spinel and mixed oxides with a small amount of nitrideinside.
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