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对具有强基面织构的轧制态AZ31镁合金实心圆棒进行了扭转及后续573 K保温1 h退火。使用电子背散射衍射技术(EBSD)探索了不同扭转角对组织及力学性能的影响。结果表明,扭转后试样扭转轴中心的组织(心部)孪晶体积分数要小于边部组织;扭转角度越大,试样中的孪晶体积分数越大。退火后,除了最小应变量的心部组织中残留有部分孪晶外,其余样品都发生了完全静态再结晶。应变量越大,退火后的平均晶粒尺寸越小,样品的塑性越好。与初始样品相比,在保持强度基本不变的情况下对于最大变形量退火的样品其塑性从13.8%提升到了25.9%。晶粒细化和织构弱化是使镁合金力学性能得到提升的主要原因。
The solid AZ31 magnesium alloy round rods with strong basal texture were twisted and annealed at 573 K for 1 h. The effects of different torsion angles on the microstructure and mechanical properties were explored using electron backscatter diffraction (EBSD). The results show that the twins volume fraction in the center of torsional axis is smaller than that in the edge part. The larger the twist angle is, the larger the twins’ volume fraction in the sample is. After annealing, except for the part of twins in the heart tissue with the minimum strain, the rest of the samples were completely static recrystallized. The larger the strain, the smaller the average grain size after annealing, the better the plasticity of the sample. The plasticity of the samples annealed to the maximum deformation was increased from 13.8% to 25.9% compared to the initial samples with the retention strength being essentially unchanged. Grain refinement and weakened texture is the main reason for improving the mechanical properties of magnesium alloys.