Journal
PHILOSOPHICAL MAGAZINE LETTERS
Volume 93, Issue 9, Pages 531-540Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09500839.2013.816447
Keywords
copper foils; yield stress; dislocations; size effect; mechanical softening
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Funding
- National Natural Science Foundation of China [50971125, 51171045]
- National Basic Research Program of China [2010CB631003]
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The mechanical softening behaviour of micrometre-scale metals (free-standing metal foils and wires) with decreasing either the geometrical or the microstructural scale (i.e. the smaller, the weaker) has recently been reported. Here, we present a mechanism-based model to understand the softening behaviour, which is based on competition between the effects of surface grain relaxation and the interior grain strengthening effect. The model describes well the yield stress of Cu foils with different ratios of the thickness to grain size.
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