Abstract
Compared to traditional laser shock peening, warm laser shock peening (WLSP) exhibits superior residual stress and thermal stability. Herein, the micro-mechanism of single-crystal nickel by WLSP is investigated via molecular dynamics (MD) simulations. The results reveal that certain slip systems, i.e., (1¯1¯1)[1¯1¯0], (11¯1¯) [110] and (111) [01¯1¯], are sequentially activated during WLPS. Then, these slip systems intersect and cross-slip of dislocations occurs, forming dislocation tangles and dislocation walls. These dislocation walls further form sub-grain boundaries when the shock pressure reaches 90 GPa, transforming single-crystalline Ni into polycrystalline Ni. In addition, WLSP at 450 K is beneficial for the formation of Hirth sessile dislocations and improves the properties of monocrystalline Ni.
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