Transactions of Materials and Heat Treatment

Title：Analysis on abnormal grain growth for 2219 aluminum alloy treated by solution treatment

Authors： Li Jiguang Wang Pai Zhang Jiegang Zhang Xialu Li Yuchen Yin Wei Zhang Xuexi

Unit： Tianjin Long March Launch Vehicle Manufacturing Co. Ltd. Harbin Institute of Technology

KeyWords： 2219 aluminum alloy abnormal grain growth solution treatment situ observation the second phase strengthening

ClassificationCode：TG146.2

year,vol(issue):pagenumber：2019,44(9):156-159

Abstract：

When the pre-tension deformation was large (pre-tension deformation of 5%)，2219 aluminum alloy for the new generation of launch vehicle tanks occured abnormal grain growth during solution quenching process. In order to solve the problem of abnormal grain growth during solution treatment, the situ observation method was used to analyze the grain growth. The result shows that when the pre-tension deformation is 5% and the solution temperature is lower 525 ℃, the grain growth is difficult, and when the solution temperature is up to 525 ℃, the grains grow rapidly and instantaneously. However, when the solution temperature reaches 535 ℃ and keeps for 6 min, the grain size is several times larger than the original grain size. At the same time, the difference in grain sizes after growing up is greater. This grain growth phenomenon is related to the large number of the second phase strengthening particle θ phase and grain boundary element segregation in 2219 aluminum alloy sheet.

Funds：

天津市科技支撑项目（17YFZCGX00530）

李继光（1981-），男，博士，高级工程师 E-mail：jiguangli2008@126.com

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