多向锻造对AZ40镁合金组织和力学性能的影响

Effect of multidirectional forging on microstructure and properties of AZ40 magnesium alloy

采用多向锻造(MDF)对Mg-4Al-1Zn-0.5Mn合金进行塑性变形,利用光学显微镜和电子背散射衍射(EBSD)等分析了合金的组织与织构。结果表明:随着锻造道次的增加,合金中的小角度晶界比例减少,大角度晶界有所增加,晶粒细化,织构有所改变,织构强度降低,各向异性减弱,径向力学性能提高。经过6道次锻造后合金的径向晶粒最细,径向塑性最高。

The plastic deformation of Mg-4 Al-1 Zn-0.5 Mn alloy was carried out by multidirectional forging(MDF),and microstructure and texture of the alloy after MDF for different passes were analyzed by means of optical microscope and electron backscattered diffraction(EBSD)technique.The results show that with the increase of forging pass,the proportion of small angle grain boundary of the alloy decreases,the large angle grain boundary increases,the grain is refined,the texture changes,the texture strength decreases,the anisotropy decreases,and the radial mechanical properties increase.After multidirectional forging for 6 passes,the radial grain size of the alloy is the smallest and the radial plasticity is the highest.