【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Al0.5FeCoCrNiSi0.2合金的氧化增重曲线相似,Al0.5FeCoCrNiTi0.5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AlN颗粒;Al0.5-FeCoCrNiTi0.5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。更多还原

【Abstract】 High-entropy alloys Al0.5FeCoCrNi,Al0.5CoCrFeNiSi0.2 and Al0.5FeCoCrNiTi0.5 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 Al0.5FeCoCrNi and Al0.5FeCoCrNiSi0.2 are similar,the velocity of the oxidation mass gains of Al0.5FeCoCrNiTi0.5 is faster.The oxides of Al0.5FeCoCrNi and Al0.5FeCoCrNiSi0.2 Cr2O3 with a small amount of AlN particles inside;the oxides of high-entropy alloy Al0.5FeCoCrNiTi0.5 are complex,there covered CoFe2O4 spinel and mixed oxides with a small amount of nitrideinside.更多还原