建立了一类镁合金双道次热变形过程的二维元胞自动机模型.考虑到镁合金具有六重对称的密排六方晶体结构,模型采用了六边形元胞网格.另外,通过计算位错密度演变和设定晶粒形核长大规则,模型将热变形过程中动态再结晶、静态回复、静态再结晶、亚动态再结晶和晶粒长大等单个物理过程耦合到一起.为了验证模型,将其应用到AZ31B镁合金单道次和双道次热压缩过程.探讨了不同变形温度、应变速率、道次间隔和预应变对应力-应变曲线的影响.将计算结果和实验结果进行了对比,吻合较好.
A 2-D CA model has been developed to simulate two-stage hot deformation processing of magnesium (Mg) alloy.Based on the fact that Mg has an HCP crystal structure with six-fold symmetry,the model employs hexagonal CA lattice.The physically-based model has integrated the effects of individual metallurgical phenomena related with the hot deformation,including dynamic recrystallization (DRX),static recovery,static recrystallization (SRX),meta-dynamic recrystallization (MDRX) and grain growth,etc.The model is validated by simulating single-stage and two-stage hot compression tests of AZ31B.The effects of temperature,strain rate,the interval and pre-strain on stress-strain curves are investigated.The calculated results are compared with the available experimental findings in AZ31B Mg alloy,and the simulated results agree well with the experimental results and theoretical models.
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