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采用一种多晶塑性模型分析Mg-3A1-1Zn合金的室温变形行为。使用铸态和挤压态两种织构类型的AZ31镁合金棒料进行室温单向拉伸和压缩试验,并与提出的模型相结合来揭示该合金的变形机制。结果表明:多晶塑性模型可以成功地模拟镁合金试样拉伸和压缩曲线的差异。挤压态AZ31镁合金拉伸和压缩曲线形状的差异是拉伸孪生和锥面滑移的不同开动行为所致。金相和透射电镜(TEM)观察表明:铸态AZ31镁合金拉伸和压缩初期具有相同的孪生开动分数;随着应变的增加,在铸态压缩试样中发生了锥面滑移,这与模拟结果相吻合。
A polycrystalline plasticity model was used to analyze the room temperature deformation behavior of Mg-3A1-1Zn alloy. Uniaxial tension and compression tests were carried out at room temperature using AZ31 magnesium alloy castings of both as-cast and extruded states and combined with the proposed model to reveal the deformation mechanism of the alloy. The results show that the polycrystalline plasticity model can successfully simulate the difference of tensile and compression curves of magnesium alloy specimens. The difference between the tensile and compressive curve shapes of extruded AZ31 magnesium alloy is due to the different actuation behavior of slippage between the stretched twin and the conical surface. Metallographic and transmission electron microscopy (TEM) observations show that the as-cast twin AZ31 magnesium alloy has the same twin-start fraction in the initial stage of tensile and compressive deformation. As the strain increases, the conical surface Slip, which is consistent with the simulation results.