Al-4.5Mg-0.6Mn铝合金高温变形行为研究

Study of High-Temperature Deformation Behavior of Al-4.5Mg-0.6Mn Aluminum Alloy

摘要: 在Gleeble-3800热模拟试验机上对Al-4.5Mg-0.6Mn铝合金进行热压缩实验，研究该合金在变形温度为300℃~500℃、应变速率为0.0l~10 s⁻¹条件下的热变形行为。分析了Al-4.5Mg-0.6Mn铝合金的高温流变行为。结果表明：变形温度和应变速率对Al-4.5Mg-0.6Mn铝合金流变应力影响显著，流变应力随变形温度的升高而降低，随应变速率的增加而增大。建立了Zener-Hollomon参数的本构方程，可对Al-4.5Mg- 0.6Mn铝合金在不同应变速率和变形温度下的峰值流变应力进行预测，发现本构方程预测值与流变应力实测值吻合较好。

Abstract: The flow stress features of Al-4.5Mg-0.6Mn aluminum alloy were studied by the isothermal com-pression of cylindrical specimen in the temperature range of 300˚C - 500˚C and strain rate range of 0.01 - 10 s⁻¹ with Gleeble-3800 simulated machine. The results show that flow stress is apparently influenced by both deformation temperature and strain rate, as the flow stress decreases with the increased temperature, while increases with the raise of strain rate. The constitutive equations were presented by Zener-Hollomon parameter, and using the Zener-Hollomon parameter consti-tutive equation presented, the prediction of the peak flow stress in Al-4.5Mg-0.6Mn aluminum alloy as function of strain rate, temperature and strain shows to be in good agreement with the measured flow stresses.