Abstract
It has been observed by experiments and computer simulations that deformation twinning and grown-in twins play important roles during the plastic deformation in nanocrystalline (nc) metals. In this study, molecular dynamics simulation is employed to investigate the role of grown-in twins in the tensile deformation of hexagonal close-packed nc cobalt. Plastic deformation processes in three types of nc samples, namely nc-cobalt without twins, with (0002) twin faults and with (1121) twins, are compared. The results show that the pre-existing twins significantly lower the mechanical strength and do not enhance the ductility of nc cobalt. Instead deformation induced hcp-to-fcc allotropie transformation is found to result in remarkable strain hardening in the modeled nc cobalt.
Original language | English |
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Pages (from-to) | 651-658 |
Number of pages | 8 |
Journal | International Journal of Nanoscience |
Volume | 4 |
Issue number | 4 |
DOIs | |
Publication status | Published - 1 Aug 2005 |
Externally published | Yes |
Keywords
- Computer simulation
- Dislocations
- Nanocrystals
- Twinning
ASJC Scopus subject areas
- Biotechnology
- Bioengineering
- Materials Science(all)
- Condensed Matter Physics
- Computer Science Applications
- Electrical and Electronic Engineering