Effects of Laser Shock and Cryogenic Treatment on Residual Stress and Mechanical Properties of 7050 Aluminum Alloy
The effects of different laser shock treatments on the residual stress and mechanical properties of 7050 aluminum alloy by cryogenic treatment and supplementary low temperature tempering were investigated.The results show that laser shock treatment can significantly increase the surface compressive stress of 7050 aluminum alloy to-260 MPa.However,the surface compressive stress decreases by about 23%after cryogenic tempering.However,the reasonable adjustment of laser shock process parameters can effectively make up for the reduction of surface compressive stress by cryogenic-supplemented low temperature tempering.Among them,when the number of laser shock is 3 times,the surface compressive stress after increasing cryogenic-supplementary low temperature tempering can reach-230 MPa.In addition,compared with single laser shock treatment,the hardness between the matrix and surface of aluminum alloy after laser shock-deep cooling-supplement low temperature tempering treatment is homogenized.The cryogenic treatment can accelerate the surface deformation of aluminum alloy samples after laser shock,and the grain size is further refined and the subgrain boundary increases,which can increase the strength of 7050 aluminum alloy.
laser shockcryogenic treatmentaluminum alloyresidual stress7050 Al alloy
NETL
NSTL
万方数据
