(中南大学 材料科学与工程学院，长沙 410083)
摘 要: 通过在Gleeble−l500热模拟试验机上进行等温热压缩试验，研究2E12铝合金在变形温度为300~500 ℃和应变速率为0.0l ~ l0 s−1条件下的流变应力行为，计算、推导出用包含Arrhenius项的Zener-Hollomon参数描述2E12合金高温压缩流变行为的表达式，并分析形变热、变形温度和应变速率等参数对流变应力的影响规律。结果表明：应变速率和变形温度对2E12合金的流变应力影响显著，流变应力随着温度的升高而降低，随着应变速率的提高而增大；在 ≥1 s−1时，形变热导致流变应力降低，且幅度随着应变速率的增大而增大，随着变形温度的升高而降低。
关键字: 2E12铝合金；热变形；流变应力；本构方程
hot plastic deformation at high temperature
（School of Materials Science and Engineering, Central South University, Changsha 410083, China）
Abstract:The flow stress behavior of a hot compressed 2E12 aluminum alloy was investigated by compression tests performed on Gleeble−1500 tester at strain rates ranging from 0.01 s−1 to 10 s−1 and temperatures ranging from 300 ℃ to 500 ℃. The expression for describing the rheological behavior of 2E12 alloy during hot compression process by Zener-Hollomon parameter including Arrhenius term was deduced. The influence of temperature rise caused by deformation, testing temperature and strain rate on the flow stress was analyzed. The results show that the flow stress of 2E12 alloy is greatly affected by strain rate and temperature. The flow stress of 2E12 alloy decreases with increasing the temperature and rises with increasing the strain rate. At ≥1 s−1, temperature rise caused by deformation results in reduced flow stress. The decrease of flow stress increases with increasing the strain rate and decreases with increasing the deformation temperature.
Key words: 2E12 aluminum alloy; hot deformation; flow stress; constitutive equation
