Journal
JOURNAL OF COMPUTATIONAL AND THEORETICAL NANOSCIENCE
Volume 10, Issue 9, Pages 2299-2303Publisher
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/jctn.2013.3201
Keywords
Nanosparticle; Dislocation; Deformation Twinning
Categories
Funding
- National Natural Science Foundation of China [11072186]
- Education Ministry of China
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The compression of the face-centered-cubic copper nanosphere is investigated by using molecular dynamics simulations. In the elastic regime, the response of nanosphere can be described by the classic Hertzian contact theory. The plastic deformation begins with the nucleation of partial dislocations from the contact edges. These partials dislocations glide and intersect to form pyramid sessile dislocation locks, which play the key role in the hardening of incipient plasticity. As the compression increases, partial dislocations nucleate from the free surface and their expansion leads to deformation twinning, which not only enhances the strength but also ductility.
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