Transactions of Materials and Heat Treatment

Title：Influence of natural aging and cold storage process on properties of 2195 Al-Li alloy profile

Authors： Wang Yanqin1 Wang Dong2 Feng Yuewen1 Liang Lidong1 Dou Pengcheng1 Ma Jinfeng1 Gu Chunjie1

Unit： 1.Tianjin Long March Launch Vehicle Manufacturing Co. Ltd. 2.School of Mechanical and Electrical Engineering and Automation Tianjin Vocational Institute

KeyWords： Al-Li alloy natural aging cold storage process strength newly quenched state

ClassificationCode：TG166.3

year,vol(issue):pagenumber：2024,49(11):162-168

Abstract：

After quenching, Al-Li alloy has good plasticity in the newly quenched state, and can be processed by plastic forming. However, the Al-Li alloy in newly quenched state has a natural aging trend, which can be delayed by cold storage. Therefore, the influence laws of natural aging time, cold storage temperatures and time on the mechanical properties of the newly quenched Al-Li alloy were obtained by uniaxial tensile test. The results show that in the newly quenched state, with the continuous increasing of natural aging time, the strength and hardness of the alloy show an increasing trend, and the elongation continuously decreases. After natural aging for 30 min, the tensile strength of the alloy is 340.65 MPa, the elongation is 20.2%. With the decreasing of cold storage temperature and the increasing of cold storage time, the strength values of the alloy show an increasing trend, while the elongation shows a decreasing trend. When the cold storage temperature is -20 ℃ and the cold storage time is within 48 h，the tensile strength of the Al-Li alloy is 332.72 MPa, the elongation is 20.48%, and the plasticity is well maintained.

Funds：

国家自然科学基金重点项目(U1937205)

作者简介：王妍琴（1987-），女，硕士，工程师 E-mail：1124337718@qq.com 通信作者：谷春杰（1987-），男，学士，工程师 E-mail：gcj2008jie@163.com2195

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