Molecular dynamics simulations of warm laser shock peening for monocrystalline nickel

作者：Sun, Yuzhen; Zheng, Haizhong^*; Geng, Yongxiang; Li, Guifa; Xiao, Yixin

来源：Materials Today Communications, 2023, 35: 105626.

DOI：10.1016/j.mtcomm.2023.105626

• Warm laser shock peening (WLSP)
• Monocrystals nickel (Ni)
• Molecular dynamics (MD) simulations
• Micro-mechanism

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., (111) [110], (111) [110] and (111) [011], 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.

• 单位
  南昌航空大学