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采用非自耗真空电弧熔炼炉制备了Cr_xCu_1Fe_2Mo_(0.5)Nb_(0.5)Ni_2(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,Cr_xCuFe_2Mo_(0.5)Nb_(0.5)Ni_2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。Cr_xCuFe_2Mo_(0.5)Nb_(0.5)Ni_2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。Cr_xCuFe_2Mo_(0.5)Nb_(0.5)Ni_2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。
High-entropy alloys of Cr_xCu_1Fe_2Mo_ (0.5) Nb_ (0.5) Ni_2 (x = 0,0.5,1.0,2.0, denoted as C1-C4 alloys) were prepared by non-consumable vacuum arc melting furnace and annealed at 700 ℃ and 800 ℃ for 12h Its microstructure and hardness were analyzed. The results show that the alloy Cr_xCuFe_2Mo_ (0.5) Nb_ (0.5) Ni_2 mainly consists of BCC phase, FCC phase and HCP phase in the as-cast state. After annealed at 700 ℃, the alloy phase does not change obviously and shows good thermal stability ; After annealing at 800 ℃, except for the C2 alloy, the FCC phase of the other alloy is transformed into the BCC phase. After annealing at 700 ℃ and 800 ℃, the microstructure of Cr_xCuFe_2Mo_ (0.5) Nb_ (0.5) Ni_2 alloy was interdendritic and interdendritic. The interdendritic region expanded with the increase of Cr content. The hardness of Cr_xCuFe_2Mo_ (0.5) Nb_ (0.5) Ni_2 alloy in as-cast, annealed at 700 ℃ and 800 ℃ both increased with the increase of Cr content, but the increase range was small. After annealing at 800 ℃, the hardness (HV) of C4 alloy increased from 441 to 480, an increase of only 8.8%, showing a relatively weaker age hardening.