Elastic properties modification in aluminum alloy induced by laser-shock processing

The elastic properties of aluminum alloy 2024-T62 shocked by laser are investigated using a laser ultrasonics method. The results show that the elastic properties modification is distributed within the specimen. The distribution can be fitted by polynomial regression. The elastic constants C11 and Poissonʹs ratio ν increase within the shocked area. The relative changes of C11 and ν can be as high as 40.6 and 24.8%, respectively. The elastic constants C44 and Youngʹs modulus E can decrease by up to 29 and 25.4%, respectively. The Lame coefficient λ increases near the center, but decreases at the edge, of the laser-shocked area.