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以变形温度和应变速率为变化参数,研究了轧制Mg-3Al-3Sn镁合金(AT33)在不同变形参数下的组织与性能的变化,通过建立本构方程分析了AT33合金的变形机制。建立了AT33合金高温变形本构方程,并计算出合金的变形激活能为145kJ/mol,应力指数n为6.5,变形机制为晶格扩散控制的位错攀移;动态再结晶在变形温度高于200℃时发生,再结晶晶粒的晶界呈锯齿状,尺寸在2μm以下。
The change of microstructure and properties of rolled Mg-3Al-3Sn magnesium alloy (AT33) under different deformation parameters was studied by taking deformation temperature and strain rate as parameters. The deformation mechanism of AT33 alloy was analyzed by establishing constitutive equation. The deformation constitutive equation of AT33 alloy was established and the deformation activation energy was 145 kJ / mol and the stress index n was 6.5. The deformation mechanism was dislocation climbing controlled by lattice diffusion. When the deformation temperature was higher than 200 ℃ occurs, recrystallized grain boundaries were jagged, the size of 2μm or less.