冷轧退火对FeMnCoCrAl高熵合金组织和力学性能的影响

Effect of cold rolling and annealing on microstructure and mechanical properties of FeMnCoCrAl high entropy alloy

使用真空电弧炉熔炼出(Fe50Mn30Co10Cr10)94Al6合金,利用冷轧及在不同温度对合金进行退火,以期望得到由多尺度再结晶晶粒构成的层状结构;并对不同退火温度的样品进行拉伸性能测试。利用扫描电镜和EBSD对合金组织形貌进行表征,采用X射线衍射方法研究其相组成。结果表明:合金在铸态和冷轧后相组成未发生变化,700℃退火得到较好的多尺度再结晶晶粒的层状结构,其屈服强度为487 MPa,抗拉强度为708 MPa,断后伸长率为39%,表现出良好的综合力学性能。

(Fe50Mn30Co10Cr10)94 Al6 high entropy alloy was prepared in vacuum electric arc melting,and cold rolled then annealed at different temperatures to obtain layered structure composed of multi-size recrystallized grains,then the tensile properties of the annealed specimens were tested.The microstructure of the specimens was characterized by means of SEM and EBSD,and the phase composition was studied by using X-ray diffraction.The results show that the phase composition of the alloy at as-cast and cold rolled states does not change,and preferable layered microstructure composed of different size grains is obtained by annealing at 700℃,with the yield strength of 487 MPa,the tensile strength of 708 MPa,and the elongation after fracture of 39%,showing favorable comprehensive mechanical properties.