铸造2023，Vol.72Issue(12)：1577-1584,8.
时效热处理对增材制造FeCoNi中熵合金微观组织与力学性能的影响
Effect of Aging Heat Treatment on Microstructure and Mechanical Properties of FeCoNi Medium Entropy Alloys Fabricated by Additive Manufacturing
摘要
Abstract
A novel high strength FeCoNi medium entropy alloy fabricated by selective laser melting technology(SLM).The effects of aging heat treatment on the microstructure and mechanical properties of FeCoNi alloy were investigated by SEM,TEM,EBSD and XRD.The results showed that the as-deposited sample was a single-phase BCC solid solution with an average grain size of 4.29 μm,microhardness of HV336,ultimate tensile strength of 1 010 MPa and elongation of about 4%.After heat treatment at 470℃,white granular precipitates were produced at grain boundaries and within grains,which was analyzed by TEM as Ni-rich Ni3Fe intermetallic compound.The content of Ni3Fe phase gradually increased with the extension of heat treatment time,and the maximum precipitated phase content was 13%after aging for 4 h.The average microhardness of the alloy increased to HV535,the microhardness increases by 59%compared with the as-deposited alloy,and the tensile strength increased to 1 514 MPa.The low-temperature aging heat treatment at 470℃produced nanoscale Ni3Fe precipitated phases in the alloy structure and refined the grains,and the precipitated phases showed a coherent relationship with the matrix,which significantly improved the alloy strength.关键词
中熵合金/激光选区熔化/析出强化/微观组织/力学性能Key words
medium entropy alloy/selective laser melting/precipitation strengthening/microstructure/mechanical properties分类
矿业与冶金引用本文复制引用
夏忠虎,张友昭,任延杰,李昱彤,李相伟,张书彦..时效热处理对增材制造FeCoNi中熵合金微观组织与力学性能的影响[J].铸造,2023,72(12):1577-1584,8.基金项目
广东省基础与应用基础研究重大项目(2020B0301030001) （2020B0301030001）
广东省引进创新创业团队项目(2016ZT06G025). （2016ZT06G025）
