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对AZ31镁合金板进行了5%、10%、15%压下量的异步冷轧,通过金相分析研究了不同的冷轧压下量对AZ31镁合金板材截面显微组织分布的影响。结果表明:随着压下量的增加,板材组织中孪晶和形变带增加。5%和10%压下量时,AZ31镁合金冷轧板的变形主要为孪生;压下量为15%时,变形主要为孪晶和形变带。当压下量较小时,孪晶在板材厚度方向的分布存在明显的不均匀,轧面附近的孪晶比板材心部多。随着变形逐渐深入到板材内部,剪切应变在板材厚度方向上各层的分布也逐渐趋于均匀。由于是异步轧制,板材上下轧面附近剪切应变分布不同,对应显微组织中的孪晶和形变带存在差异。
The asynchronously cold rolled AZ31 magnesium alloy plates were reduced by 5%, 10% and 15% respectively. The influence of different cold rolling reduction on the microstructure distribution of AZ31 magnesium alloy plates was studied by metallographic analysis. The results show that the twins and deformation bands increase with the increase of the reduction. At 5% and 10% reduction, the deformation of AZ31 magnesium alloy cold rolled plate is mainly twins; the deformation is mainly twins and deformation zone when the reduction is 15%. When the reduction is small, the distribution of twins in the direction of plate thickness is obviously uneven, and the twins near the rolling surface are more than the heart of the plate. As the deformation gradually penetrates into the interior of the sheet, the distribution of shear strain in the thickness direction of the sheet gradually becomes uniform. Due to the asynchronous rolling, the distribution of shear strain near the upper and lower rolling surfaces is different, and the corresponding twins and deformation zones in the microstructure are different.