【摘要】 利用真空感应熔炼炉制备了不同Al含量的镍基合金,研究了Al含量对镍基合金微观组织和力学性能的影响。结果表明,当Al含量为9.5wt%时,合金铸态组织主要由γ’相和γ相组成;当Al含量超过10.5wt%时,合金中出现β(NiAl)相;当Al含量超过13.5wt%时,合金中出现α(Cr)相;当Al含量达到17.5wt%时,合金中的γ’和γ相消失,主要由β(NiAl)相和α(Cr)相组成。随着Al含量的提高,合金的强度和伸长率呈下降趋势,断裂由穿晶向沿晶转变。更多还原

【Abstract】 Ni-based superalloys with different Al content were prepared and the microstructure and mechanical properties were investigated.The microstructure of the as-cast alloys changes with the adding of aluminum.The primary microstructure is composed of γ and γ’,when Al content is 9.5wt%.And β(NiAl) and α(Cr) phases are observed,when the Al content is higher than 10.5% and 13.5%,respectively.The γ and γ’ phase disappear,when the Al content is 17.5%,then the microstructure is mainly composed of β(NiAl) and α(Cr) phase.The ultimate strength and ductility of the alloys decrease with the addition of aluminum,and the fracture mode changes from intergranular fracture into transgranular fracture.更多还原