Dynamic characteristics of nanoindentation in Ni: A molecular dynamics simulation study

doi:10.1088/1674-1056/21/11/116201

Abstract In the present work, three-dimensional molecular dynamics simulation is carried out to elucidate the nanoindentation behaviour of single crystal Ni. The substrate indenter system is modeled using hybrid interatomic potentials including manybody potential (embedded atom method) and two-body Morse potential. Spherical indenter is chosen, and the simulation is performed for different loading rates from 10 m/s to 200 m/s. Results show that the maximum indentation load and hardness of the system increase with the increase of velocity. The effect of indenter size on the nanoindentation response is also analysed. It is found that the maximum indentation load is higher for large indenter whereas the hardness is higher for smaller indenter. Dynamic nanoindentation is carried out to investigate the behaviour of Ni substrate to multiple loading-unloading cycles. It is observed from the results that the increase in the number of loading unloading cycles reduces the maximum load and hardness of the Ni substrate. This is attributed to the decrease in recovery force due to defects and dislocations produced after each indentation cycle.

Keywords: indentation nanocrystalline loading-unloading dislocation

Received: 10 May 2012
Revised: 01 June 2012
Accepted manuscript online:

PACS:	62.23.-c	(Structural classes of nanoscale systems)
	62.20.F-	(Deformation and plasticity)
	62.20.mt	(Cracks)

Fund: Project supported by HEC, Pakistan.

Corresponding Authors: Fayyaz Hussain
E-mail: fiazz_hussain@yahoo.com

Cite this article:

Muhammad Imran, Fayyaz Hussain, Muhammad Rashid, S. A. Ahmad Dynamic characteristics of nanoindentation in Ni: A molecular dynamics simulation study 2012 Chin. Phys. B 21 116201

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