Abstract
This paper investigates microstructure evolution in laser shock peened pure nickel. The microstructure of the deformed layer produced by laser shock peening (LSP) was systematically characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). Results indicated that the amplitude and depth of micro-hardness in the surface layer increased with the number of laser impacts. A nanocrystalline layer was prepared in pure Ni after LSP and the LSP induced microstructures included dislocations (Ds), ultra-fine laminates (UFLs), ultra-fine grains (UFGs), nano-laminates (NLs), and nano-grains (NGs). Based on the in-depth microstructure observations, a grain refinement mechanism induced by LSP in pure Ni was proposed. The strengthening mechanism of micro-hardness induced by LSP could be attributed to the barriers of dislocation motion, including low-angle grain boundaries, large-angle grain boundaries and dislocation multiplication.
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