Transactions of Materials and Heat Treatment

Title：Thermal deformation behavior and microstructure on extruded 6082 aluminum alloy

Authors： Yang Xin1 2 Cao Shanpeng1 Sun Youzheng1 2 3 Pang Guangxin1 Wang Yingning1 Wang Ping3

Unit： 1.Shandong Nanshan Aluminum Industry Co. Ltd. 2. Shandong Nanshan Institute of Science and Technology Co. Ltd. 3. Yantai Nanshan University

KeyWords： 6082 aluminum alloy constitutive model thermal compression microstructure Vickers hardness

ClassificationCode：TG146.21

year,vol(issue):pagenumber：2023,48(11):238-248

Abstract：

The thermal deformation behavior of 6082 aluminum alloy along the extrusion deformation direction under the deformation temperature of 350-500 ℃ and strain rate of 0.01-10 s-1 was studied by using thermal simulation testing machine Gleeble-3500, the true stress-true strain curves were obtained, and the constitutive equation was established. Then, in order to study the thermal processing performance of extruded 6082 aluminum alloy profiles, the thermal processing diagrams under the strains of 0.3 and 0.9 and the peak stress were drawn, and the changes of microstructure, the second phase size and material hardness after thermal compression were analyzed by optical microscope (OM), scanning electron microscope (SEM), microhardness tester and other devices. The results show that the strength of the extruded 6082 aluminum alloy does not decrease significantly during the thermal compression process, and the main softening mechanism is dynamic recovery. The content of the second phase gradually decreases with the increasing of deformation temperature, but the fragmentation degree of the second phase increases, and the Vickers hardness after thermal compression also increases. After calculation, the thermal deformation activation energy of extruded 6082 aluminum alloy is 205.74 kJ·mol-1, and it is recommended that the better thermal processing process range of this alloy is 465-500 ℃/0.01-0.7 s-1.

Funds：

作者简介：杨鑫（1997-），男，硕士，E-mail：yangxin1@nanshan.com.cn；通信作者：孙有政（1987-），男，博士，高级工程师，E-mail：sunyouzheng@nanshan.com.cn

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