Laser shock peening effect on the dislocation transitions and grain refinement of Al–Mg–Si alloy

摘要: Abstract This paper systematically investigates the effect of laser shock peening without coating parameters on microstructural evolution, and dislocation configurations induced by ultra-high plastic strains strain rates. Based an analysis optical microscopy, polarized light transmission electron microscopy observations residual stress analysis, significant influence due to plasma generation wave propagation has been confirmed. Although results revealed no changes after peening, i.e. heat zone differences in distribution second-phase particles, expressive treatment craters was Moreover, have confirmed existence well-defined longish grains up 455 μm length centre plate rolling effect, randomly oriented smaller (20 μm × 50 μm) surface static recrystallization effect. Laser is reflected exceptional increase density with various configurations, lines, cells, tangles, formation dense walls. More importantly, microstructure considerably refined deformations process. The that structures during deformation addition shear bands producing ultra-fine (60–200 nm) nano-grains (20–50 nm). Furthermore, increased a factor 2.5 compared untreated material (29 × 1013 m− 2 vs. 12 × 1013 m− 2).