采用热力模拟试验方法进行热压缩变形试验,研究了一种新型Al-Zn-Mg-Cu合金在变形温度为300~450℃,应变速率为0.001~1s-1,压缩变形程度为50%条件下的流变应力行为。结果表明,变形温度和应变速率对合金流变应力的大小影响显著,流变应力随变形温度的升高而降低,随应变速率的提高而增大。采用统计回归方法建立了该合金的热压缩变形流变应力本构方程,其热变形激活能Q=169.92kJ/mol。
Abstract
Hot compression tests of a new Al-Zn-Mg-Cu high strength alloy were carried out by thermal-mechanical simulation.The flow stress was studied at the temperature of 300～450℃,strain rates of 0.001~1s-1 and the reduction of 50%.The results show that both the temperature and strain rate have remarkable effects on the flow stress during hot deformation.The flow stress decreases with the increasing temperature and increases with the increasing strain rates.The constitutive equation of the alloy is obtained.The activation energy of the alloy is 169.92kJ/mol.
关键词
Al-Zn-Mg-Cu合金 /
热压缩变形 /
流变应力 /
本构方程
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Key words
Al-Zn-Mg-Cu alloy /
hot compression defo /
flow stress /
constitutive equatio
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