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This paper presents novel advances in the deformation behaviour of polycrystalline and single crystal silicon using molecular dynamics (MD) simulation and validation of the same via nanoindentation experiments. In order to unravel the mechanism of deformation, four simulations were performed: indentation of a polycrystalline silicon substrate with a (i) Berkovich pyramidal and a (ii) spherical (arc) indenter, and (iii and iv) indentation of a single crystal silicon substrate with these two indenters. The simulation results reveal that high pressure phase transformation (HPPT) in silicon (Si-I to Si-II phase transformation) occurred in all cases; however, its extent and the manner in which it occurred differed significantly between polycrystalline silicon and single crystal silicon, and was the main driver of differences in the nanoindentation deformation behaviour between these two types of silicon. Interestingly, in polycrystalline silicon, the HPPT was observed to occur more preferentially along the grain boundaries than across the grain boundaries. An automated dislocation extraction algorithm (DXA) revealed no dislocations in the deformation zone, suggesting that HPPT is the primary mechanism in inducing plasticity in silicon.
|Number of pages||14|
|Journal||Journal of Physics D: Applied Physics|
|Early online date||13 Jun 2014|
|Publication status||Published - 2014|
- polycrystalline silicon
- single crystal silicon
- molecular dynamics
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- Design, Manufacturing And Engineering Management - Professor
- 1 Finished
Micro-3D: Miniature Flexible & Reconfigurable Manufacturing System for 3D Micro-products
Luo, X., Ion, W., Qin, Y., Jagadeesan, A. P. & Zeng, Q.
EPSRC (Engineering and Physical Sciences Research Council)
1/07/13 → 31/12/17