粉末冶金制备AlCrMoNiTi高熵合金的时效硬化特性（英文）  

Age Hardening of AlCrMoNiTi High Entropy Alloy Prepared by Powder Metallurgy

作　　者：任波[1,2] 马建辉[1] 赵瑞锋[1] 关绍康[2] 张红松[1] 

机构地区：[1]河南工程学院,河南郑州451191 [2]郑州大学,河南郑州450052

出　　处：《稀有金属材料与工程》2014年第6期1286-1290,共5页Rare Metal Materials and Engineering

基　　金：Post-doctoral Scientific Research Foundation of China(2013M541986);Post-doctoral Scientific Research Foundation of Zhengzhou University;Doctoral Scientific Foundation of Henan Institute of Engineering(062101)

摘　　要：采用粉末冶金工艺制备了AlCrMoNiTi高熵合金,并对其铸态和退火态的微观组织和硬度进行了研究。结果表明,铸态合金由富(Cr,Mo)bcc固溶体枝晶相和富(Al,Ni,Ti)fcc固溶体枝晶间相组成。时效合金在900℃高温可获得最高硬度HV约为6150 MPa,在1000℃发生退火软化现象,但是其硬度HV仍保持在5160 MPa的高硬度水平。这表明,AlCrMoNiTi高熵合金具有优异的高温时效硬化特性。该合金在800℃时的时效硬化特性主要归因于细晶强化,在900℃时则归因于第二相(bcc2)的析出硬化。在1000℃时发生退火软化现象,其原因在于第二相的分解和晶粒粗化。The AlCrMoNiTi high entropy alloy was prepared by powder metallurgy process. Its microstructure and hardness of as-cast and annealed state were studied. The results show that the as-cast alloy exhibits a mixture of the dendrite （Cr, Mo）-rich bcc phase and the interdendrite （Al, Ni, Ti）-rich fcc phase. The aged alloy can obtain a peak hardness HV of 6150 MPa at 900℃, and then anneal softening occurs at 1000 ℃, but its hardness HV still maintained at a high level of 5160 MPa. This shows that the AICrMoNiTi alloy exhibits a good high-temperature age hardening performance. Age hardening of the alloy is mainly attributed to the grain refinement strengthening at 800 ℃ and the precipitation hardening of the second phase （bcc2） at 900℃. The disappeared second phase and grain coarsening are the main reasons for the softening anneal at 1000 ℃.

关 键 词：高熵合金 粉末冶金工艺 固溶体 微观组织 时效硬化 

分 类 号：TF125.2[冶金工程—粉末冶金]