5182铝合金热变形行为研究

采用了MMS-100热力模拟试验机对5182铝合金进行单道次压缩实验，对其热变形行为展开研究，构建了流变应力模型和加工图.结果发现:5182铝合金的流变应力随温度的升高、应变速率的降低而逐渐减小；高温条件会促使动态再结晶的发生，而应变速率的影响可以忽略；合金的真应力-真应变曲线在高应变速率时会出现锯齿状波动；合金在加热温度420~500 ℃、真应变ε= 0.4、应变速率的热变形条件下会有一个高功率耗散因子区域；合金在450 ℃附近存在较大安全加工区域. 

Research on the thermal denaturation of 5182 aluminium alloy

The MMS-100 thermal simulation tester was utilized to perform a single pass compression test on 5182 aluminium alloy, and its thermal denaturation behavior was studied to construct a model of flow stress and the processing map. The results showed that the flow stress of 5182 aluminium alloy gradually decreased with the increase in temperature and the decrease in strain rate. Moreover, high temperature would promote the occurrence of dynamic recrystallization, and the effect of strain rate could be ignored. The true stress-true strain curve of the alloy produced jagged undulations at high strain rates; there would be a high-power dissipation factor area when the true strain ε=0.4 at 420 ℃ to 500 ℃, and the strain rate to 0.1 s-1. In addition, the alloy had a larger safe machining area when the temperature was near 450 ℃.