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研究了热轧AZ31镁合金板材中低温变形(室温～573K)时孪生所导致的硬化和软化效果,并结合金相显微技术(OM)和透射电子显微技术(TEM)对相关变形机理及孪生类型进行判断。结果发现,有较强基面织构特征的AZ31镁合金板材在室温～573K变形过程中{10ī1}压缩孪晶起主要作用,同时也存在少量的基面滑移。变形温度越高,变形速率越小,孪晶数量也逐渐减少。中低温变形时AZ31镁合金轧制板材中的压缩孪晶和二次孪晶同时起软化作用与硬化作用,但硬化作用大于软化作用。
The hardening and softening effects caused by twinning at low temperature deformation (room temperature ~ 573K) in hot rolled AZ31 magnesium alloy sheets were studied. Correlation deformation mechanism and twinning types were analyzed by metallographic microscopy (OM) and transmission electron microscopy (TEM) Judge. The results show that the compressive twins of {10 ī 1} during the deformation from room temperature to 573 K play an important role in the AZ31 magnesium alloy sheet with strong basal texture, and there is also a small amount of basal slip. The higher the deformation temperature, the smaller the deformation rate and the smaller the number of twins. Compression twins and secondary twins in the AZ31 magnesium alloy rolled plate both soften and harden at mid-low temperature deformation, but the hardening effect is greater than the softening effect.