TITLE

Nanoscale-twinning-induced strengthening in austenitic stainless steel thin films

AUTHOR(S)
Zhang, X.; Misra, A.; Wang, H.; Nastasi, M.; Embury, J.D.; Mitchell, T.E.; Hoagland, R.G.; Hirth, J.P.
PUB. DATE
February 2004
SOURCE
Applied Physics Letters;2/16/2004, Vol. 84 Issue 7, p1096
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
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. © 2004 American Institute of Physics.
ACCESSION #
12202336

 

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