AlxFeNiSiTi高熵合金的显微组织与力学性能研究

Study on Microstructure and Mechanical Properties of AlxFeNiSiTi High-entropy Alloy

通过机械合金化结合冷等静压、真空烧结工艺制备了AlxFeNiSiTi(x=0.2,0.4,0.7,1.0)系高熵合金,研究Al含量变化对高熵合金显微组织和力学性能的影响。结果表明,随着Al含量的增加,合金相成分明显变化,类Ni的FCC相逐渐向富Al的BCC2相转变,而合金硬度先减小后增大,当Al含量为1.0时达到1015 HV。合金的纳米压痕硬度随着富FeSiTi的BCC1相体积分数增加而增大。

AlxFeNiSiTi(x=0.2,0.4,0.7,1.0)high-entropy alloy was prepared by mechanical alloying combined with cold isostatic pressing and vacuum sintering.The effect of Al content change on the microstructure and mechanical properties of the high-entropy alloy was studied.The results show that with the increase of Al content,phase composition of the alloy significantly changes:Ni-like FCC phase gradually transforms into Al-rich BCC2 phase.The hardness of the alloy decreases at first and then increases with Al content increasing,reaching 1015 HV when the Al content is 1.0.The nano-indentation hardness of the alloy increases with the increase of the volume fraction of FeSiTi-rich BCC1 phase.