Cr含量对CrMnFeNi系高熵合金腐蚀行为的影响EI北大核心CSCD

利用XRD,SEM/EDS,EBSD,电化学测试等表征手段研究Cr含量对Cr_(x)MnFeNi(x=0.8,1.0,1.2,1.5)高熵合金微观组织与耐蚀性能的影响。结果表明:Cr_(0.8)MnFeNi高熵合金为单相FCC结构,Cr_(x)MnFeNi(x=1.0,1.2,1.5)高熵合金为FCC+BCC双相结构,且BCC相比例随着Cr含量升高而增加。在0.5 mol/L H_(2)SO_(4)溶液中,高熵合金的耐蚀性能随着Cr含量降低而增强,其中,Cr_(0.8)MnFeNi单相高熵合金的耐蚀性能最好,这是因为Cr_(0.8)MnFeNi高熵合金的成分更为均匀。此外,Cr_(x)MnFeNi高熵合金在0.5 mol/L H_(2)SO_(4)溶液中均具有宽泛的钝化区域以及明显的伪钝化区域,表明合金在耐蚀性能上具有较大的研究价值和开发潜力。

Effect of Cr content on corrosion behavior of CrMnFeNi high entropy alloys

The effect of Cr content on the microstructure and corrosion resistance of Cr_xMnFeNi(x=0.8, 1.0, 1.2, 1.5) high entropy alloys was studied by using XRD, SEM/EDS, EBSD and electrochemical testing. The results show that Cr_0.8 MnFeNi high entropy alloy exhibits single FCC phase structure, while Cr_xMnFeNi(x=1.0, 1.2, 1.5) high entropy alloys show FCC+BCC dual phase structure, and the BCC phase ratio of dual phase alloys increases with the increase of Cr content.The corrosion resistance of high entropy alloys gradually increases with the decrease of Cr content.Among them, Cr_0.8MnFeNi high entropy alloy has the best corrosion resistance, because the composition of the alloy is more uniform.In addition, Cr_xMnFeNi high entropy alloys have extensive passive region and obvious pseudo passive region in 0.5 mol/L H₂SO₄ solution, which indicates the alloys have greater research value and development potential in corrosion resistance.