中文摘要：

采用Gleeble-3500热模拟试验机对一种新型的耐热高强度铝合金211Z.X进行等温压缩试验,研究其热变形行为,试验条件为温度350500℃、应变速率0.0110.00 s-1。试验得出了该合金在热加工状态下的应力应变曲线,通过分析应变对材料常数的影响,获得了相应的变化规律,得到应变与材料常数之间的6次多项式的拟合关系,根据Arrhenius模型建立了应变补偿本构关系模型,并对该模型进行了验证。研究结果表明：变形温度和应变速率对合金的流变应力有显著的影响,在实验温度相同的条件下,流变应力随应变速率的增大而升高,应变速率相同时,随温度的增加而降低,说明合金具有正的应变速率敏感性;应变对材料常数具有很大的影响,变形激活能Q随应变的增加逐渐降低,合金的可加工性逐渐改善;通过计算得到的流变应力与试验值具有较高的吻合度,相关性R为0.9801,平均相对误差为6.132%。

英文摘要：

High temperature deformation behavior of a new type of 211 Z. X heat-resisting high strength and toughness aluminum alloy was investigated by Gleeble-3500 thermal simulation testing machine in the temperature range of 350 ~ 500 ℃ and strain rates range of0. 01 ~ 10. 00 s-1. The curves of flow stress of 211 Z. X aluminum alloy were obtained. And the discipline of material constants with the variation of true strain and the 6 times polynomial equation under different true strain were obtained by studying the influence of flow stress on the constants. The constitutive equation with the strain compensation was established based on the Arrhenius relation model,and the accuracy of the proposed constitutive equation was verified. The results showed that the flow stress was significantly influenced by both temperature and strain rate. The flow stress decreased with the increase of temperature under the same deformation rate and increased with the increase of strain rate under the same temperature. The material constants were significantly affected by the true strain,the deformation activation energy decreased with the increase of true strain and the deformability was improved. The flow stress values calculated by the proposed model had a good agreement with experimented flow stress. The high value of correlation coefficient was 0. 9801 and low value of average relative error was 6. 132%.