Nanoscale-twinning-induced strengthening in austenitic stainless steel thin films Journal Articles uri icon

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abstract

  • Magnetron-sputter-deposited austenitic 330 stainless steel (330 SS) films, several microns thick, were found to have a hardness ∼6.5 GPa, about an order of magnitude higher than bulk 330 SS. High-resolution transmission electron microscopy revealed that sputtered 330 SS coatings are heavily twinned on {111} with nanometer scale twin spacing. Molecular dynamics simulations show that, in the nanometer regime where plasticity is controlled by the motion of single rather than pile-ups of dislocations, twin boundaries are very strong obstacles to slip. These observations provide a new perspective to producing ultrahigh strength monolithic metals by utilizing growth twins with nanometer-scale spacing.

authors

  • Zhang, X
  • Misra, A
  • Wang, H
  • Nastasi, M
  • Embury, Johndavid
  • Mitchell, TE
  • Hoagland, RG
  • Hirth, JP

publication date

  • February 16, 2004