Abstract
A microstructure and distribution of residual stresses after the laser shock peening of the AMg6 Al alloy without a protective coating were studied. The X-ray diffraction analysis showed the correlation between the parameters of the crystal structure and the profile of residual stresses of the treated samples. It was found that domain size decreased up to 50 nm, microstrains increased up to 0,0019 and average dislocation density increased up to 4,7·1014 м–2. Laser shock processing generates residual compressive stresses in depth up to 2 mm with a maximum of –120 MPa on the surface of the material. The profile and depth of the residual compressive stresses depend on the power density, overlap coefficient and the number of processing.
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