一种新型Al-Cu-Li系合金的热压缩流变应力

Flow stress of a new type Al-Cu-Li system alloy during hot compression deformation

  • 摘要: 采用Gleeble-1500热模拟机高温等温压缩试验,研究了一种新型Al-Cu-Li系合金在应变速率为0.01~10s-1、变形温度为3130~500℃条件下的流变应力特征,结果表明:流变应力随变形温度的升高而降低,随变形速率的提高而增大;采用Z参数的双曲正弦函数描述该合金高温变形的峰值流变应力,获得了峰值流变应力解析式,其热变形激活能为239.02kJ·mol-1.

     

    Abstract: The flow stress behavior of a new type Al-Cu-Li system alloy during hot compression deformation was studied in the strain rate range from 0.01 to 10 s-1 and the temperature range from 300 to 500℃ by isothermal compression test on a Gleeble 1500 thermal-mechanical simulator. The results show that the flow stress of this new type Al-Cu-Li system alloy decreases with the increase of deformation temperature and increases with the increase of strain rate. The peak flow stress during high temperature deformation can be represented by Z parameter in a hyperbolic sine function. The analytical expression of peak flow stress was fitted with the hot deformation activation energy of 239.02 kJ·mol-1.

     

/

返回文章
返回