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Influence of cryogenic-vibration compound field on the residual stress and forming accuracy during aluminum alloy forming

Li Cheng, Long Jinchuan, Wang Xinyun, Ning Bo, Li Desong, Feng Gang, Deng Lei, Tang Xuefeng

Archives of Civil and Mechanical Engineering

2024

Vol. 24, no. 2

art. no. e136, 2024

Aluminum alloy parts are widely used in aerospace and other fields due to their light weight and good corrosion resistance. However, during the forming process, uneven deformation can lead to high residual stresses and low forming accuracy in the parts, ultimately seriously affecting the subsequent service performance. In this study, the influence of the cryogenic-vibration compound field on the residual stresses, microstructural evolution, and forming accuracy were investigated based on the deep drawing experiment of aluminum alloy cylindrical parts. The results indicate that when compared to the absence of cryogenic and vibration, the compound field can reduce residual stresses in the parts by 22%, which is attributed to lower dislocation density and more uniform distribution of low-angle grain boundaries. The cryogenic environment can weaken the degree of dislocation entanglement in low-angle grain boundaries, meanwhile, the dislocations are easily dissociated and released under the vibration. The maximum sidewall thickness difference, the sidewall height difference, and the surface roughness decrease by 68, 69, and 52%, respectively, which is due to the uniform distribution of microstructure and the reduction of frictional resistance caused by the boiling liquid nitrogen. This study provides a new method for the forming of high-quality aluminum alloy parts.