CoCrFeNi高熵合金组织演变规律及再结晶动力学  

Microstructure Evolution and Recrystallization Kinetics of CoCrFeNi High Entropy Alloy

作　　者：毕梦园 谢仁义 张艺凡 衣海龙[1] BI Meng-yuan;XIE Ren-yi;ZHANG Yi-fan;YI Hai-long(State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2021年第7期933-938,共6页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(51674079).

摘　　要：利用Gleeble-1500 D热模拟试验机对添加少量C原子的非等原子比CoCrFeNi高熵合金进行热变形处理.结果表明,当变形温度为1123 K,应变速率为0.1 s-1时,合金的显微组织主要为变形晶粒,随着温度的升高或应变速率的降低,变形晶粒边缘开始出现细小的等轴晶;当变形温度为1223 K时,其组织全部为等轴的再结晶晶粒.当变形温度大于1223 K时,晶粒开始出现明显的长大现象.利用Arrhenius模型及Avrami方程,建立了CoCrFeNi高熵合金的再结晶动力学模型,对应的再结晶激活能为526.078 kJ·mol-1.Using a Gleeble-1500 D thermal simulator,the non-equal molar CoCrFeNi high entropy alloy doped with minor carbon was conducted by hot deformation under different deformation conditions.The results show that when the temperature is 1123 K and strain rate is 0.1 s-1,the microstructure is mainly composed of deformed grains.With the increase of temperature or decrease of strain rate,fine grains start to appear at the deformed grains edge.When the temperature increases to 1223 K,all microstructure is transformed to equiaxed recrystallization grains.When the temperature is higher than 1223 K,the grains become coarse.Arrhenius model and Avrami equation were used to build the kinetic model of recrystallization,and the activation energy was obtained as 526.078 kJ/mol.

关 键 词：高熵合金 热变形 显微组织 再结晶动力学 激活能 

分 类 号：TG139[一般工业技术—材料科学与工程]