退火温度和时间对CoCrFeNiCu高熵合金组织和性能影响

Effect of Annealing Temperature and Time on Microstructure and Properties of CoCrFeNiCu High-Entropy Alloy

采用真空熔炼和铜模吸铸的方法制备CoCrFeNiCu高熵合金,利用光学显微镜(OM)、显微硬度测试仪对合金进行表征,研究不同退火时间、退火温度对合金组织及性能的影响。结果表明,CoCrFeNiCu显微组织为枝晶、枝晶间和α+β共晶结构。随着退火温度的上升,枝晶组织出现先粗化后细化的现象;退火时间的增加会导致α+β相含量减少;CoCrFeNiCu显微硬度与枝晶相的含量相关。

The CoCrFeNiCu high-entropy alloy was prepared by vacuum melting and copper die casting.The alloy was characterized by optical microscope(OM)and microhardness tester.The effect of annealing time and annealing temperature on the microstructure and properties of the alloy were investigated.The results show that the microstructure of CoCrFeNiCu is dendritic,interdendritic and α+β eutectic structure.With the increase of annealing temperature,the dendritic structure appears to be coarsened and refined.The increase of annealing time leads to the decrease of α+β phase content.The microhardness of CoCrFeNiCu is related to the content of dendritic phase.