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通过Deform-3D有限元数值模拟分析,研究了在热挤压变形时不同挤压比对镁合金棒材成形的影响,分别对AZ31镁合金棒材在10、30和50 3种不同挤压比进行了应力、应变及流速分别模拟分析。研究表明,随着挤压比增大,挤压过程有效应变增大,流变应力也增大。这主要是因为与镁合金在挤压变形过程中的非基面滑移开动和动态再结晶的开动有关。镁合金棒材的挤压比不断增大,棒材挤压变形产生的变形能量则可以通过自身适当的转动,并随之相应的调整镁合金在热变形时滑移方向,使棒材沿着挤压(ED)方向产生挤压塑性变形流变。
The effect of different extrusion ratio on the forming of magnesium alloy bar was studied by Deform-3D finite element numerical simulation. The effects of different extrusion ratio on AZ31 magnesium alloy bar at 10, 30 and 50 Stress, strain and flow rate were simulated respectively. Research shows that as the extrusion ratio increases, the effective strain increases and the flow stress increases. This is mainly due to the non-basal slip and dynamic recrystallization of magnesium alloy during the extrusion deformation. Magnesium alloy bar extrusion ratio increases, the bar deformation deformation deformation energy generated by its own appropriate rotation, and the corresponding adjustment of the magnesium alloy in the thermal deformation of the slip direction, so that the bar along Squeeze (ED) the direction of extrusion plastic deformation flow.