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

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

中国物理B ›› 2012, Vol. 21 ›› Issue (11): 116201-116201.doi: 10.1088/1674-1056/21/11/116201

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇下一篇

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

Muhammad Imran^a, Fayyaz Hussain^{a b}, Muhammad Rashid^a, S. A. Ahmad^a

a Department of Physics Simulation Lab, Islamia University of Bahawalpur 63100, Pakistan;
b Department of Physics, National University of Singapore 117542, Singapore

收稿日期:2012-05-10 修回日期:2012-06-01 出版日期:2012-10-01 发布日期:2012-10-01
基金资助:
Project supported by HEC, Pakistan.

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

Muhammad Imran^a, Fayyaz Hussain^{a b}, Muhammad Rashid^a, S. A. Ahmad^a

a Department of Physics Simulation Lab, Islamia University of Bahawalpur 63100, Pakistan;
b Department of Physics, National University of Singapore 117542, Singapore

Received:2012-05-10 Revised:2012-06-01 Online:2012-10-01 Published:2012-10-01
Contact: Fayyaz Hussain E-mail:fiazz_hussain@yahoo.com
Supported by:
Project supported by HEC, Pakistan.

摘要/Abstract

摘要： 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.

关键词: indentation, nanocrystalline, loading-unloading, dislocation

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.

Key words: indentation, nanocrystalline, loading-unloading, dislocation

中图分类号: (Structural classes of nanoscale systems)

62.23.-c

62.20.F- (Deformation and plasticity) 62.20.mt (Cracks)

Muhammad Imran, Fayyaz Hussain, Muhammad Rashid, S. A. Ahmad . Dynamic characteristics of nanoindentation in Ni: A molecular dynamics simulation study[J]. 中国物理B, 2012, 21(11): 116201-116201.

Muhammad Imran, Fayyaz Hussain, Muhammad Rashid, S. A. Ahmad. Dynamic characteristics of nanoindentation in Ni: A molecular dynamics simulation study[J]. Chin. Phys. B, 2012, 21(11): 116201-116201.

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

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

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