Strong Strain Hardening in Nanocrystalline Nickel
Data(s) |
2009
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Resumo |
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 20 nm 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 islocation. motion. These observations may help with developing strong and ductile NC metals and alloys. |
Identificador | |
Idioma(s) |
英语 |
Fonte |
Physical Review Letters.2009,103(20):205504 |
Palavras-Chave | #固体力学::本构关系 |
Tipo |
期刊论文 |