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采用非自耗真空电弧熔炼炉制备了Al_(0.3)CrFe_(1.5)MnNi_(0.5)(A_0)、Al_(0.3)CrFe_(1.5)MnNi_(0.5)Ti_(0.2)(A1)和Al_(0.3)CrFe_(1.5)MnNi_(0.5)Si_(0.2)(A_2)等3种高熵合金,然后在700~1 000℃时效处理12h后进行了物相分析、微观组织表征和硬度测试。结果表明,3种合金的铸态组织主要由BCC相组成,时效组织主要由富Cr、Mn、Fe的BCC相、Cr_5Fe_6Mn_8(ρ相)析出相和球形Ni-Al析出相组成。由于Ni-Al相和ρ相析出,使得A_0、A_1和A_2合金的时效硬度(HV)分别达到899、943和955,与A_0合金铸态时硬度相比分别提高了142%、154%和157%。1 000℃时效处理后,A_1和A_2合金的硬度(HV)仍高达800以上,表现出良好的时效硬化特性。
The Al_ (0.3) CrFe_ (1.5) MnNi_ (0.5) (A_0), Al_ (0.3) CrFe_ (1.5) MnNi_ (0.5) Ti_ (0.2) (Al) and Al_ (0.3) were prepared by non-consumable vacuum arc melting furnace. CrFe_ (1.5) MnNi_ (0.5) Si_ (0.2) (A_2) and other high entropy alloys were prepared and then the phase analysis, microstructure characterization and hardness testing were carried out after aged at 700-1000 ℃ for 12h. The results show that the as-cast microstructures of the three alloys are mainly composed of BCC phases, and the aged microstructures consist of BCC phase rich in Cr, Mn and Fe, precipitates of Cr 5 Fe 6 Mn 8 (p phase) and spherical Ni-Al precipitates. As the precipitation of Ni-Al phase and ρ phase, the aging hardness (HV) of A_0, A_1 and A_2 alloys reached 899, 943 and 955, respectively, which increased by 142%, 154% and 157% %. After aging at 1000 ℃, the hardness (HV) of A_1 and A_2 alloys is still above 800, showing good age hardening properties.