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高熵合金以其独特的结构和优异的性能备受国内外学者关注与研究。本文采用非自耗电弧熔炼炉熔炼制备了AlxFe Cr Co Cu Ti(x=0,0.5,1.0,1.5,2.0,2.5)6组合金,用X射线衍射(XRD)、扫描电镜(SEM)、能谱分析(EDS)、差示扫描量热法(DSC)和热重分析(TG)等技术探究了不同Al元素对合金组织结构、成相规律、硬度及高温氧化性能的影响。研究发现,6组合金都是典型的树枝晶结构,合金组织成分偏析严重,Cu元素大量聚集在晶间,并且晶间存在着大量的富Al纳米级颗粒。合金具有较强的硬度,其硬度与组织结构密切相关,Al的加入可以提高合金的硬度。TG实验表明,合金具有很强的抗高温氧化能力,加热到800℃以前质量几乎保持不变,Al元素的增加可以有效提高合金的抗高温氧化能力,它们随Al含量的增加而增强。
High entropy alloy has received much attention and research from domestic and foreign scholars for its unique structure and excellent performance. In this paper, six groups of AlxFe Cr Co Cu Ti (x = 0,0.5,1.0,1.5,2.0,2.5) alloys were prepared by non-consumable arc melting furnace and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) (EDS), differential scanning calorimetry (DSC) and thermogravimetric analysis (TG) were used to investigate the effects of different Al elements on the microstructure, phase transition, hardness and high temperature oxidation properties of the alloy. The study found that the six groups of alloys are typical dendritic structure, segregation of the composition of the alloy serious, a large number of Cu elements gathered in the intergranular, and there is a large number of intergranular Al-rich nano-particles. Alloy has a strong hardness, the hardness is closely related to the organizational structure, the addition of Al can improve the hardness of the alloy. TG experiments show that the alloy has a strong resistance to high temperature oxidation, the quality remained almost unchanged before heating to 800 ℃, the increase of Al can effectively improve the high temperature oxidation resistance of the alloy, which increases with the increase of Al content.