摘要
在Gleeble-3500热模拟试验机上,对Cu-Cr-Zr合金进行了热模拟试验,研究了其真应力-应变曲线的变化规律。结果表明,合金的流变应力及峰值应力均随变形温度的升高和应变速率的降低而减小,说明该合金属于正应变速率敏感材料。在变形初始阶段,冷轧时效态合金的流变应力及应力增加速率大于时效态合金的。随着应变增大,时效态合金的流变应力大于冷轧时效态合金的。采用双曲正弦函数描述Cu-Cr-Zr合金的,求得其热变形激活能并建立该合金时效态和冷轧时效态的流变应力本构方程。
Hot compression deformation of Cu-Cr-Zr alloys at 0. 000 1～0. 100 0 s-1 and 25～700 ℃ was carried out on the Gleeble-3500 thermal simulation testing machine. The flow stresses-strain curves at different deformation conditions were investigated. The results show that the flow stress and peak stress are decreased with the increase of temperature and increased with the increase of strain rate, which indi- cates Cu-Cr-Zr alloy belongs to a kind of positive strain rate sensitive material. The stress increment rate and the flow stress of the alloy at rolling aging state are more than those of aging state at the initial stage, and with the increase of strain, flow stress of the alloy at rolling aging state is lower than those of ones at aging state. The flow stress of Cu-Cr-Zr alloy during high temperature deformation can be ex- pressed in hyperbolic sine function. Meanwhile, the hot deformation activation energy of two states dur- ing hot deformation was calculated, and constitutive equation was derived.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2015年第6期666-669,共4页
Special Casting & Nonferrous Alloys
基金
国家自然科学基金资助项目(51104113)
