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采用光学显微镜及电子背散射技术(EBSD)等手段研究扭转及后续退火工艺对热轧板Mg-2Al-1Zn镁合金塑性及拉压不对称性的改善。室温扭转后,样品的屈服强度、抗压强度以及压缩塑性都得到同步提高;随着扭转应变量的增加,样品的压缩塑性提高;并且在退火后,扭转试样的塑性得到大幅度提升,断裂时的最大真应变为0.279,是原始轧制态的2倍。此外,扭转及扭转/退火后的样品拉压不对称性得到明显改善。分析表明,镁合金样品塑性的大幅度提高及拉压不对称性的改善主要是由于在扭转及后续退火过程中生成晶粒得到细化的梯度组织,以及原始强基面板织构的弱化和随机化。
Optical microscopy and electron backscattering (EBSD) were used to study the plasticity and the improvement of asymmetry of tension and compression of hot-rolled Mg-2Al-1Zn magnesium alloy by twisting and subsequent annealing processes. After torsion at room temperature, the yield strength, compressive strength and compressive plasticity of the samples all increased synchronously. With the increase of torsional strain, the compressive plasticity of the samples increased. After annealing, the ductility of the samples was greatly improved. When the maximum true strain of 0.279, is the original state of rolling 2 times. In addition, the torsional and torsional / annealed specimens show a significant improvement in tension and compression asymmetry. The analysis shows that the substantial increase of plasticity and the improvement of tension-compression asymmetry of the magnesium alloy are mainly due to the grain refinement of the graded microstructure during twisting and subsequent annealing, and the weakening of the original strong base plate texture and the randomness The