Modification of residual stress and microstructure in aluminium alloy by cryogenic treatment

Materials Science and Technology - Tập 36 Số 14 - Trang 1547-1555 - 2020
Zeju Weng1,2, Xuanzhi Liu1,2, Kaixuan Gu1, Jia Guo1, Chen Cui1, Junjie Wang1,2
1CAS Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Beijing, People's Republic of China
2University of Chinese Academy of Sciences, Beijing, People’s Republic of China

Tóm tắt

The effect of cryogenic treatment (CT) combined with solution and ageing treatment on the residual stress and microstructure of 7050 aluminium alloy was investigated. The relationship between residual stress and microstructure was discussed. The results showed that compared to solution–ageing treatment (SA), CT after solution and before ageing (SCA) exhibited lower level and higher uniformity of residual stress. The highest dimensional stability was also obtained by the process of SCA. It was found that CT induced the fine precipitates through the lattice contraction under cryogenic temperature. Furthermore, the execution of CT in advance would also promote the uniform distribution of precipitates in the subsequent ageing by releasing and homogenising the residual stress.

Từ khóa


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