锻压技术

Al-Zn-Mg-Cu合金热压缩流变应力行为及组织演变

英文标题：Flow stress behavior and microstructure evolution of Al-Zn-Mg-Cu alloy during hot compression deformation

作者：王亮李惠曲陈慧琴刘建生

分类号：TG142.41

出版年,卷(期):页码：2010,35(4):133-136

摘要：

采用Gleeble-1500D热力模拟试验机进行了Al\|Zn\|Mg\|Cu合金的等温压缩实验，变形温度为250～450 ℃,应变速率为0.001～0.1 s^-1,变形量为10%～50%，获得了热压缩变形的真应力-真应变曲线。应力-应变曲线基本呈现回复型曲线特征，计算得出其应力指数为4.60，热变形激活能为186.70 kJ·mol^-1；综合分析了变形温度、应变速率和变形量对组织演变的影响规律，确定了Al-Zn-Mg-Cu合金的锻造工艺参数为：锻造温度区间420～350 ℃，应变速率0.01～0.1 s^-1，变形量＞30%。

Isothermal compression experiments of Al-Zn-Mg-Cu alloy specimens were carried out on Gleeble-1500 thermal\|mechanical simulator under the conditions of 250-450 ℃ temperature, 0.001-0.1 s^-1 strain rate and 10%-50% deformation. The true stress and true strain curves were obtained, which showed the character of dynamic recovery. The stress exponent and hot deformation activation energy calculated were 4.60 and 186.70 kJ·mol^-1,respectively. Influence of deformation temperature, strain rate and reduction on microstructure evolution were analyzed. And the reasonable process parameters of forging were defined that the temperature interval is 420-450 ℃，strain rate range is 0.01-0.1 ^-1, and the reduction exceeds 30%.

基金项目：

国家重点基础研究基金资助项目973（2005CB623705）

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