Transactions of Materials and Heat Treatment

Title：Thermal working and microstructure evolution for 2219 aluminum alloy

Authors： Ren Dongchao Qiu Juan Yang Tao Yu Wanhua Zhai Yuewen Deng Kaihao

Unit： Beijing Research Institute of Mechanical & Electrical Technology Ltd. University of Science and Technology Beijing AVIC Standard Parts Manufacturing Co. Ltd. Guangxi Vocational & Technical Institute of Industry

KeyWords： 2219 aluminum alloy thermal deformation thermal processing diagram microstructure dynamic softening mechanism

ClassificationCode：TG142.1

year,vol(issue):pagenumber：2022,47(5):211-216

Abstract：

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.

Funds：

“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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