The residual stress of the cold expanded hole of aluminum alloy LY12CZ and LC4CS, when bush is not used, has an obvious trend towards attenuation, and the change in attenuation is characterized by different speed forms.

• 以LY12CZ与LC4CS为基材的铝合金无衬套冷胀残余应力在外加循环应力作用下有明显的衰减趋势，并以不同速率形式反映了衰减的变化差异。