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为了研究不同温度对镁合金挤压的影响,运用Deform 3D软件分别对AZ31B镁合金棒材在300、350、400、450℃的挤压过程进行了有限元模拟。结果表明,随着温度升高,合金的有效应变增大,流变应力减小。这种现象主要与非基面滑移的开动以及动态再结晶的开动有关,释放了应力集中,软化了材料。由于挤压过程中材料上下流动不一样,造成挤压后棒材弯曲现象。随着温度的升高,弯曲趋势随之增大。
In order to study the effect of different temperature on the extrusion of magnesium alloy, Deform 3D software was used to simulate the extrusion process of AZ31B magnesium alloy bar at 300, 350, 400 and 450 ℃ respectively. The results show that with the increase of temperature, the effective strain of the alloy increases and the flow stress decreases. This phenomenon is mainly related to the non-basal slip and the dynamic recrystallization, which release the stress concentration and soften the material. As the extrusion process is not the same material flow up and down, resulting in bar bending after extrusion phenomenon. As the temperature increases, the bending tendency increases.