退火温度对铝热法制备的TiCrFeMnNi高熵合金组织与硬度的影响  

Effect of annealing temperature on microstructure and hardness of high-entropy alloy TiCrFeMnNi prepared with aluminothermic method

作　　者：喇培清[1] 杨理洁 肖海波 盛捷[1] 李正宁[1] 石玉 LA Pei-qing;YANG Li-jie;XIAO Hai-bo;SHENG Jie;LI Zheng-ning;SHI Yu(State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou Univ.of Tech.,Lanzhou 730050,China)

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室

出　　处：《兰州理工大学学报》2019年第4期1-5,共5页Journal of Lanzhou University of Technology

摘　　要：采用铝热法制备TiCrFeMnNi高熵合金,通过XRD、SEM、EPMA和硬度测试研究了铸态以及700、800、1000℃退火后其组织和性能的变化.结果表明:铝热法制得的TiCrFeMnNi高熵合金为树枝晶结构,相组成包括体心立方相,面心立方相和σ相.铸态TiCrFeMnNi高熵合金的硬度可达615HV.与铸态相比,随着退火温度的升高,σ析出相不断溶解,1000℃退火后几乎完全溶解,硬度先明显上升后略有下降,分别为810、767、778HV.Aluminothermic method was used to prepare high-entropy alloy TiCrFeMnNi and the change of its microstructure and properties under condition of as-cast and 700 ℃,800 ℃ and 1 000 ℃ annealing were studied by means of XRD,SEM,EPMA and hardness test.The result indicated that high-entropy alloy TiCrFeMnNi prepared with aluminothermic method would be of dentrite structure and its phase composition would include body-centered cubic phase,face-centered cubic phase and σ phase.The as-cast high-entropy alloy TiCrFeMnNi would have a hardness of 615 HV.As the annealing temperature increased,the σ precipitate phase dissolve continuously. Compared with the as-cast condition,the σ precipitation phase dissolves continuously as the annealing temperature increases.After annealing at 1 000 ℃,it almost completely dissolves.The hardness first increases slightly and then decreases slightly.After annealing,it is 810,767,778 HV,respectively.

关 键 词：高熵合金 铝热法 退火温度 组织 硬度 

分 类 号：TG139[一般工业技术—材料科学与工程] TG132[金属学及工艺—合金]