Al-3％ Cu-2％ Li合金的热变形行为

摘要

Isothermal compression tests of Al‐3% Cu‐2% Li alloy were performed on a Gleeble‐1500 system in the temperature range between 350 and 500 ℃ at strain rates between 0 0.01 and 1 s-1 .The flow behavior was de‐scribed by a hyperbolic sine constitutive equation and the microstructures of samples were observed by optical microscopy (OM) .The results showed that peak stress levels decreased at higher deformation temperatures and lower strain rates .The results were represented by the Zener‐Hollomon parameter in an exponential equation with an activation energy for hot deformation of 325 4.8 kJ/mol .%在Gleeble‐1500热模拟仪上进行热压缩实验，研究了变形温度为350～500℃，应变速率为00．01，00．1，01．和1 s－1时Al‐3％ Cu‐2％ Li合金的热变形行为。利用双曲正弦本构关系分析热变形中的流变应力，采用金相分析热变形中合金的显微组织变化。结果表明，该合金流变应力的大小受变形温度、应变速率的强烈影响，它随变形温度升高而降低，随应变速率提高而增大，该合金高温流变应力可采用 Zener‐Hol‐lomon 参数的函数来描述，其热变形激活能为3254．8 kJ／mol。