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

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  • Zeju Weng
    CAS Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Beijing, People's Republic of China
  • Xuanzhi Liu
    CAS Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Beijing, People's Republic of China
  • Kaixuan Gu
    CAS Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Beijing, People's Republic of China
  • Jia Guo
    CAS Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Beijing, People's Republic of China
  • Chen Cui
    CAS Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Beijing, People's Republic of China
  • Junjie Wang
    CAS Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Beijing, People's Republic of China

Abstract

<jats:p> 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. </jats:p>

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