TY - JOUR
T1 - Strong Strain Hardening in Nanocrystalline Nickel
AU - Wu, X. L.
AU - Zhu, Y. T.
AU - Wei, Y. G.
AU - Wei, Q.
PY - 2009/11/13
Y1 - 2009/11/13
N2 - Low strain hardening has hitherto been considered an intrinsic behavior for most nanocrystalline (NC) metals, due to their perceived inability to accumulate dislocations. In this Letter, we show strong strain hardening in NC nickel with a grain size of ∼20nm under large plastic strains. Contrary to common belief, we have observed significant dislocation accumulation in the grain interior. This is enabled primarily by Lomer-Cottrell locks, which pin the lock-forming dislocations and obstruct dislocation motion. These observations may help with developing strong and ductile NC metals and alloys. © 2009 The American Physical Society.
AB - Low strain hardening has hitherto been considered an intrinsic behavior for most nanocrystalline (NC) metals, due to their perceived inability to accumulate dislocations. In this Letter, we show strong strain hardening in NC nickel with a grain size of ∼20nm under large plastic strains. Contrary to common belief, we have observed significant dislocation accumulation in the grain interior. This is enabled primarily by Lomer-Cottrell locks, which pin the lock-forming dislocations and obstruct dislocation motion. These observations may help with developing strong and ductile NC metals and alloys. © 2009 The American Physical Society.
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U2 - 10.1103/PhysRevLett.103.205504
DO - 10.1103/PhysRevLett.103.205504
M3 - RGC 21 - Publication in refereed journal
SN - 0031-9007
VL - 103
JO - Physical Review Letters
JF - Physical Review Letters
IS - 20
M1 - 205504
ER -