Transactions of Materials and Heat Treatment

Title：Research on microstructure and properties of high strength aluminum alloy Al-Zn-Mg-Cu in isothermal multi-axial open-die forging

Authors： Zhao Xiaodong Wang Liang Yu Zheng Chen Huiqin Liu Jiansheng

Unit： Taiyuan University of Science and Technology Beijing Institute of Aeronautical Materials

KeyWords： high strength aluminum alloy Al-Zn-Mg-Cu thick-plate forgings isothermal multi-axial open-die forging microstructure and properties

ClassificationCode：TG146

year,vol(issue):pagenumber：2015,40(9):1-6

Abstract：

For the problems of hot forging crack heavily and uneven microstructure in the multi-axial free forging process of high strength aluminum alloy Al-Zn-Mg-Cu, the isothermal multi-axial forging process was studied under different forging processes. Then, the microstructure and mechanical properties of the forging samples after solid-solution and aging heat treatment were observed and tested. The influences of deformation temperatures, deformation modes and forging ratios on microstructure and properties of the forging were analyzed and compared. The results indicate that when the total forging ratio is up to 11-12, grain refinement in the forging process can be obtained by large deformation dynamic recrystallizatin at a high-temperature of 420 ℃ and then static recrystallization at a low-temperature of 380 ℃ during the forming, which can make the part with higher strength, good plastic and toughness. Meanwhile the process of making billet can also be simplified, then the forming process can be shortened and the productivity can be increased.

Funds：

国家自然科学基金资助项目（51175361）；山西省科技攻关项目(20110321013-02)；太原市科技明星项目(120247-1)

赵晓东（1978-），男，博士研究生，讲师；通讯作者：陈慧琴（1968-），女，博士，教授

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