锻压技术

2219铝合金热加工及组织演化

英文标题：Thermal working and microstructure evolution for 2219 aluminum alloy

作者：任东超邱娟杨涛余万华翟月雯邓开豪

单位：北京机电研究所有限公司北京科技大学中国航空工业标准件制造有限责任公司广西工业职业技术学院

分类号：TG142.1

出版年,卷(期):页码：2022,47(5):211-216

摘要：

利用Gleeble-1500试验机进行变形温度为400～480 ℃、变形速率为0.001～10 s-1的单轴热压缩试验，得到了不同变形条件下的真应力-真应变曲线，建立了不同应变量下的热加工图，研究了挤压态2219铝合金在不同变形条件下的微观组织演变规律。研究表明：在所选择的变形区间内，变形抗力随着变形温度的增加以及变形速率的降低而降低。分析了不同应变量条件下的2219铝合金热加工图，并结合微观组织进行验证，结果吻合良好。最终，确定了2219铝合金最佳热变形区间为：应变速率为0.001~0.368 s-1、变形温度为430~480 ℃，在所确定的可加工区域动态软化机制为动态再结晶，热加工之后晶粒为均匀等轴状。

The uniaxial thermal compression tests were carried out at deformation temperatures from 400 to 480 ℃ and deformation rates from 0.001 to 10 s-1 by testing machine Gleeble-1500, and the true stress-true strain curves under different deformation conditions were obtained. Then, the thermal processing diagrams under different strain amounts were established, and the microstructure evolution laws of the extruded 2219 aluminum alloy under different deformation conditions were studied. The results show that the deformation resistance decreases with the increasing of deformation temperature and the decreasing of deformation rate within the selected deformation interval. The thermal processing diagrams of 2219 aluminum alloy under different strain amounts were analyzed,which was verified by combining with the microstructure, the results are in good agreement. At last, the best thermal deformation interval of 2219 aluminum alloy is determined as the strain rate of 0.001-0.368 s-1 and the deformation temperature of 430-480 ℃. The dynamic softening mechanism in the determined machinable region is dynamic recrystallization, and the grains are uniform equiaxed after thermal processing.

基金项目：

“高档数控机床与基础制造装备”科技重大专项（2018ZX04044001）

作者简介：任东超（1997-），男，硕士研究生，E-mail：rendongchao1997@163.com；通信作者：邓开豪（1967-），男，学士，高级工程师，E-mail：2233578149@qq.com

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