AlCrCuFeNb_(x)NiTi高熵合金的摩擦磨损及高温氧化性能  

Friction and wear and high temperature oxidation properties of AlCrCuFeNb_(x)NiTi high entropy alloys

作　　者：徐思民 阴艳丽[2] 邝海[3] 何文[1] 赵海博 XU Si-min;YIN Yan-li;KUANG Hai;HE Wen;ZHAO Hai-bo(School of Materials Science and Engineering,Nanchang Hangkong University,Nanchang 330063,China;School of Information and Artificial Intelligence,Nanchang Institute of Technology,Nanchang 330108,China;Key Laboratory for Optoelectronics and Communication of Jiangxi Province,Jiangxi Science Technology Normal University,Nanchang 330038,China)

机构地区：[1]南昌航空大学材料科学与工程学院,江西南昌330063 [2]南昌工学院信息与人工智能学院,江西南昌330108 [3]江西科技师范大学江西省光电子与通信重点实验室,江西南昌330038

出　　处：《材料热处理学报》2024年第7期106-116,共11页Transactions of Materials and Heat Treatment

基　　金：江西省自然科学基金面上项目(20202BAB204013);南昌航空大学研究生创新专项资金项目(YC2022-001)。

摘　　要：采用真空电弧熔炼方法制备了AlCrCuFeNb_(x)NiTi高熵合金,并研究了铸态合金的组织、摩擦磨损性能和高温氧化性能。结果表明:Nb元素的添加促进了Laves相的形成,使AlCrCuFeNiTi合金的相结构由L2_(1)相、BCC相和FCC相转变为AlCrCuFeNb_(0.5)NiTi合金的L2_(1)相、Laves相和FCC相。Nb元素的添加会降低AlCrCuFeNiTi合金的耐磨性能,磨损速率从AlCrCuFeNiTi合金的1.572×10^(-5) mm^(3)/(N·m)提高到AlCrCuFeNb_(0.5)NiTi合金的4.483×10^(-5) mm^(3)/(N·m),合金的室温磨损机制均为粘着磨损。合金的氧化动力学遵循抛物线速率定律,Nb元素对AlCrCuFeNb_(x)NiTi合金高温氧化性能的影响随着温度的改变而改变,800和900℃时能提高其高温氧化性能,但1000℃时Laves相的内氧化现象严重导致其高温氧化性能恶化。AlCrCuFeNb_(x)NiTi high entropy alloys were prepared by vacuum arc melting method,and microstructure,friction and wear properties,and high temperature oxidation properties of the as-cast alloys were investigated.The results show that the addition of Nb element promotes the formation of Laves phase,and the phase structure of the AlCrCuFeNiTi alloy changes from L2_(1)phase,BCC phase and FCC phase to L2_(1)phase,Laves phase and FCC phase of the AlCrCuFeNb_(0.5)NiTi alloy.The addition of Nb element will reduce the wear resistance of the AlCrCuFeNiTi alloy,the wear rate of the alloy increases from 1.572×10^(-5)mm^(3)/(N·m)for the AlCrCuFeNiTi alloy to 4.483×10^(-5)mm^(3)/(N·m)for the AlCrCuFeNb_(0.5)NiTi alloy,and the room temperature wear mechanism of the alloys is both adhesive wear.The oxidation kinetics of the alloys follow the parabolic rate law,and the effect of Nb element on the high-temperature oxidation performance of the AlCrCuFeNb_(x)NiTi alloy changes with the change of temperature.Its high-temperature oxidation performance can be improved at 800 and 900℃,but the severe internal oxidation phenomenon of Laves phase at 1000℃leads to a deterioration of its high-temperature oxidation performance.

关 键 词：AlCrCuFeNiTi高熵合金 Nb元素 显微组织 摩擦磨损 高温氧化 

分 类 号：TG139.8[一般工业技术—材料科学与工程]