AlFeCrCoNi高熵合金的机械合金化法制备及退火行为研究

AlFeCrCoNi High Entropy Alloy Prepared by Ball Milling and Its Annealing Behavior Research

为了研究AlFeCrCoNi高熵合金的热处理工艺,文中采用机械合金化法制备了AlFeCrCoNi高熵合金,研究了球磨时间对Al、Fe、Cr、Co、Ni合金相变、晶粒尺寸、颗粒尺寸和球磨粉体形貌的影响,分析了球磨法制备的AlFeCrCoNi高熵合金的退火行为.研究结果表明:随着球磨时间的延长,晶粒尺寸逐渐减小,趋于稳定时其晶粒尺寸为34.球磨60h时,粉体颗粒形貌为球状,颗粒尺寸约为20μm.AlFeCrCoNi高熵合金在加热过程中分别在615.7℃、971.5℃和1 384.3℃出现三个吸热峰,前两个峰表明发生固态相变,1 384.3℃为高熵合金的熔点.

In order to study on the heat treatment process of AlFeCrCoNi high entropy alloys,an equiatomic AlFeCrCoNi high-entropy alloy was synthesized by mechanical alloying,and the effect of milling time on alloy phase evolutions,grain size,particle size and milled powder morphology was investigated.The annealing behavior of the AlFeCrCoNi high-entropy alloy by ball milled was also investigated.It was found that with the increase of ball milling time,the grain size gradually decreases,and finally the grain size was 34.Meanwhile,due to the effect of cold welding-broken of the power again and again,power particle is spherical and power size is about 20μm after 60 hmilling time.There are three endothermic peaks in 615.7 ℃,971.5 ℃and 1 384.3 ℃in the process of heating AlFeCrCoNi high-entropy alloy by ball milled.Two peaks 615.7 ℃ and 971.5 ℃correspond to solid state phase transition points.The melting point of AlFeCrCoNi high-entropy alloy is 1 384.3 ℃.