温度和应变速率对7050－H112铝合金流变应力和微观组织行为的影响
Deformation and microstructure behavior of 7050-H112 aluminum alloy at different temperature and strain rates
王梦寒，王文浩，董旭刚，贾耀军
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作者单位：重庆大学材料科学与工程学院
中文关键字：铝合金；热压缩变形；本构方程；动态再结晶；微观组织
英文关键字：aluminum alloy; hot compression deformation; constitutive equation; dynamic recrystallization; microstructure
中文摘要：利用Gleeble-1500热模拟机在变形温度300℃、350℃、 400℃、 450℃，应变速率0.01s-1、0.1s-1、1s-1、10s-1条件下，对7050－H112铝合金进行高温等温压缩实验，研究了热压缩变形时温度和应变速率对该合金的流变行为的影响。结果表明：7050－H112铝合金对应变速率敏感，流变应力随应变速率的提高而升高；该合金高温压缩变形时的流变应力可用Zener－Hollomon参数的双曲正弦函数形式来描述，其形变激活能为172KJ/mol。微观组织演化过程表明该合金在应变速率0.01s-1、加热温度是450℃时发生了动态再结晶，得到了细长晶粒的合金组织。
英文摘要：The flow behavior of aluminum alloy 7050-H112 was studied by isothermal hot compression in 300℃,350℃,400℃,450℃ and in strain rate range of 0.01s-1,0.1s-1,1s-1,10s-1 on Gleeble-1500 thermal-mechanical simulator. The results showed that the flow stress of aluminum alloy 7050-H112 which is increased with the increasing strain rate is sensitive to positive strain rate and it could be expressed by a zener-hollomon parameter in hyperbolic sine equation form with a deformation activation energy of 172KJ/mol during hot compression. The process of microstructure evolution indicates that dynamic recrystallization with fine grains occurs at the strain rate 0.01s-1 and 450℃.