3104铝合金热变形的试验研究

Experimental research of 3104 aluminium alloy at elevated temperature

采用G leeb le-3500热模拟实验机,对3104铝合金在变形温度为350℃~500℃、应变速率为0.001 s-1~1s-1、变形程度为50%的条件下进行热压缩试验。结果表明,流变应力随应变的增加而显著增大,到达峰值后逐渐降低并趋于稳定,具有明显的稳态流变特征。变形温度和应变速率对流变应力影响较大,并用包含Arrhen iues项的本构方程描述了3104铝合金的高温变形行为。

Using Gleeble-3500 thermo-mechanical simulator,hot compression test for 3l04 aluminum alloy at deformation temperatures of 300℃～500℃ and strain rates of 0.001s-1～1 s-1were carried out under maximum strain of 50%.The experimental results show that flow stress increases apparently with strain.Above a critical peak value,flow stress decreases gradually to be a steady state.The characteristic with the steady deformation occurs during hot compression of aluminum alloy.The effects of deformation temperature and strain rate on flow stress are dominating.In this paper,a constitutive equation based on Arrheniues item is established to describe the deformation behavior of aluminum alloy at elevated temperature.