摘要
用真空电弧熔炼法制备了AlCuCrFeNi多主元高熵合金。利用X射线衍射仪、扫描电子显微镜、显微硬度仪等研究了AlCuCrFeNi铸态以及采用不同退火工艺后的微观组织和硬度。结果表明:AlCuCrFeNi合金在铸态下是由枝晶内富Cr、Fe元素的BCC固溶相、枝晶间富Al、Ni的B2相以及枝晶间富Cu的FCC固溶相组成,并伴有少量的金属间化合物AlFe0.23Ni0.77,铸造硬度值约为(465±10) HV。随着退火温度升高,Cu元素发生扩散,FCC相变得粗大,合金的硬度值降低到400 HV左右,与铸态硬度相差不大,说明合金具有较高的热稳定性以及较好的高温使用性能。
AlCuCrFeNi high entropy alloy was prepared by vacuum arc melting. The microstructure and hardness of AlCuCrFeNi were studied by means of X-ray diffractometer, scanning electron microscope and microhardness tester. The results show that, the cast AlCuCrFeNi alloy consists of BCC solid solution phase which is rich in Cr, Fe elements in dendrite,Al, Ni rich B2 phase in dendritic phase and FCC solid solution phase in dendrite phase which is rich in Cu and a small amount of intermetallic compound AlFe0.23Ni0.77, the microhardness of the cast alloy is(465 ±10) HV. The diffusion of Cu element occurs with the increase of annealing temperature. The FCC phase becomes coarse and the hardness of the alloy decreases to about 400 HV. There is little difference between the hardness and the as-cast alloy’s hardness. The results show that the alloy has high thermal stability and high temperature performance.
作者
许弘睿
李瑞卿
张立华
XU Hongrui;LI Ruiqing;ZHANG Lihua(School of Mechanical and Eleetrical Engineering, Central South University, Changsha 410083, China;State KeyLaboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China;College ofLight Alloys, Central South University, Changsha 410083, China)
出处
《热加工工艺》
北大核心
2019年第14期116-120,共5页
Hot Working Technology
基金
国家自然科学基金资助项目(51475480
5160496)
关键词
高熵合金
退火工艺
显微组织
硬度
high entropy alloy
annealing process
microstructure
hardness
