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 ℃.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
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)
关键词
高熵合金
粉末冶金工艺
固溶体
微观组织
时效硬化
high entropy alloy
powder metallurgy process
solid solution
microstructure
age hardening
