Ti对AlCoCrFeNiTi_x高熵合金微观组织和摩擦性能的影响

为揭示Ti对高熵合金微观组织演变和磨损性能的影响机理,采用非自耗真空电弧熔炼炉制备了AlCoCrFeNiTix系高熵合金,探究其微观组织和摩擦性能。结果发现,随Ti含量增加,AlCoCrFeNiTix系高熵合金由单一的体心立方结构(BCC)转变为两种BCC结构,合金组织形貌由树枝晶转变为花瓣状等轴晶,Al、Ni、Ti主要分布于枝晶内,而Fe、Cr主要富集于枝晶间。AlCoCrFeNiTi0.8合金硬度(HV)为525.2,体积磨损量为6×10^-4 mm^3,具有最佳的耐磨性能。

Microstructure Evolution and Wear Resistance of AlCoCrFeNiTi_x High Entropy Alloys

AlCoCrFeNiTix(x=0, 0.4, 0.8, 1.0) high entropy alloys(HEAs) were prepared by non-consumable vacuum arc melting furnace. The microstructure and wear resistance of the AlCoCrFeNiTix were investigated. The experimental results reveal that high entropy alloys AlCoCrFeNiTix are transformed from a single body-centered cubic structure(BCC) into two kinds of body-centered cubic structures with the increase of Ti content, and the morphology of alloy is transformed from dendrites into the petal-like equiaxed crystals. Meanwhile, there exists the enrichment of alloying element that Al-Ni-Ti elements are mainly distributed in dendrites, while Fe-Cr elements are mainly concentrated between dendrites. In addition, the hardness and the volume of wear resistance of the AlCoCrFeNiTi0.8 HEAs reach 525.2 HV and 6×10^-4 mm^3, indicating that AlCoCrFeNiTi0.8 HEAs have the desirable wear resistance.