粉末冶金法制备AlxCuFeNiCoCr高熵合金及其性能

• 作 者: 江佳阳 杜景红 严继康 张家敏 甘国友
• 机 构: 昆明理工大学材料科学与工程学院,云南昆明650093
• 出 处: 稀有金属材料与工程
• 发表日期: 2022年2期
• 关键词: high-entropy alloys powder metallurgy electrochemistry

采用粉末冶金法制备了AlxCuFeNiCoCr高熵合金.研究了铝含量对合金性能和组织的影响,并讨论了合金制备过程中晶粒性能的变化.结果 表明,在球磨过程中合金晶粒细化,且合金晶粒尺寸随Al含量的增加而增大.在烧结过程中,合金中会产生新的晶粒,并首先吸收一定热量形成含Al的金属间化合物.在1200℃加热2h后,获得具有简单晶体结构的相,证实了高熵合金的形成.根据获得的能谱,合金组成均匀,合金化程度高.然而,随着Al含量的增加,出现了少量具有高Al含量的高对比度区域.合金具有良好的高温抗氧化性能和抗电化学腐蚀性能.随着铝含量的增加,合金的高温抗氧化性能提高.当Al含量为1mol％时,自腐蚀电压为-235 mV.随着Al含量的增加,硬度也增加.结果 表明,当Al含量为1mol％时,合金具有最佳综合性能.“,”AlxCuFeNiCoCr high-entropy alloys were prepared by powder metallurgy method.The effect of Al content on the properties and microstructure of the alloys was studied,and the change in the grain properties during the preparation of the alloys was discussed.The results show that the alloy grains are refined during the milling process,and the grain size of the alloy increases with the increase of Al content.New grains are generated in the alloy during the sintering process,and an intermetallic compound containing Al is initially formed by absorbing a certain amount of heat.A phase with simple crystal structure is obtained after heating at 1200 ℃ for 2 h,which confirms the formation of high-entropy alloy.Based on the obtained energy spectrum,the alloy composition is uniform,and the alloying degree is high.However,with the increase in Al content,a small number of high-contrast areas with high Al content emerge.The alloys exhibit a good high-temperature oxidation resistance and electrochemical corrosion resistance.The oxidation resistance at high temperature increases with the increase of Al content.The self-corrosion voltage is-235 mV when x=l.0.With the increase in Al content,the hardness also increases.The best overall properties of the alloy are achieved when x=1.0.