摘要
采用非自耗真空电弧熔炼炉制备了CrxCu1Fe2Mo0.5Nb0.5Ni2（x=0、0.5、1.0、2.0,记为C1-C4合金）高熵合金,在700℃和800℃退火12h后对其微观组织和硬度进行了分析。结果表明,CrxCuFe2Mo0.5Nb0.5Ni2合金在铸态主要由BCC相、FCC相和HCP相组成、经700℃退火处理后,合金物相均未发生明显改变,表现出良好的热稳定性;经800℃退火后,除C2合金外,其余合金的FCC相转变为BCC相。CrxCuFe2Mo0.5Nb0.5Ni2合金经700℃和800℃退火后,其微观组织为枝晶和枝晶间组织,并随Cr含量的增加,枝晶间区域扩大。CrxCuFe2Mo0.5Nb0.5Ni2合金在铸态、700℃和800℃退火态的硬度均随Cr含量的增加而提高,但是增加幅度较小。800℃退火处理后,C4合金的硬度（HV）由441增加至480,增幅仅为8.8%,表现出相对较弱的时效硬化现象。
The CrxCuFe2Mo（0.5）Nb（0.5）Ni2（x=0,0.5,1.0,2.0,named as C1,C2,C3 and C4alloys,respectively）high entropy alloys were prepared with non-vacuum self-consumer arc melting furnace.The microstructure and hardness of the alloys prepared at as-cast,700 ℃ and 800 ℃ annealed treatment for 12 h were characterized.The results show that the as-cast alloys are composed of a mixed structure of BCC,FCC and HCP phases.The change of phase structure is absent after annealed treatment at 700℃,presenting agood thermostability.Except C2 alloy.Phase of the alloys is transferred from FCC phase to BCC phase after 800 ℃ aging treatment.Microstructure of the annealed alloys is composed of dendritic and interdendritic structure,and region of the interdendritic is enlarged gradually after annealed at 700℃ and 800 ℃.The hardness of the as-cast and annealed alloys is increased slightly with the Cr content increase.After 800 ℃annealed treatment,hardness of the C4 alloy is increased from 441 HV to 480 HV,increased by only about 8.8%,presenting a relatively weak phenomenon of age hardening.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2016年第12期1312-1315,共4页
Special Casting & Nonferrous Alloys
基金
中国博士后基金面上项目(2013M541986)
河南工程学院博士基金资助项目(D2013013)
河南省科技攻关计划资助项目(162102210286)
关键词
高熵合金
时效处理
微观组织
硬度
High Entropy Alloy
Aging Treatment
Microstructure
Hardness
