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Tytuł:
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Nanoscale-twinning-induced strengthening in austenitic stainless steel thin films.
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Autorzy:
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Zhang, X.
Misra, A.
Wang, H.
Nastasi, M.
Embury, J.D.
Mitchell, T.E.
Hoagland, R.G.
Hirth, J.P.
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Temat:
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THIN films
NANOSCIENCE
TWINNING (Crystallography)
STAINLESS steel
MAGNETRONS
TRANSMISSION electron microscopy
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Źródło:
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Applied Physics Letters; 2/16/2004, Vol. 84 Issue 7, p1096-1098, 3p, 2 Diagrams, 1 Graph
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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. [ABSTRACT FROM AUTHOR]
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