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Initial Contact Behavior of Nanograined Ni-25at.%Al Film During Nanoindentation

Published online by Cambridge University Press:  01 February 2011

Han. Li  and
Alfonso H. W. Ngan
Han. Li
Affiliation:
Department of Mechanical Engineering, the University of Hong Kong Pokfulam Road, Hong Kong, P. R. China
Alfonso H. W. Ngan
Affiliation:
Department of Mechanical Engineering, the University of Hong Kong Pokfulam Road, Hong Kong, P. R. China
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Abstract

Cyclic indentation was performed on standard fused quartz, single crystal Ni3Al (111) and nanocrystalline Ni-25at. %Al alloy thin film with average grain size of a few nanometers. For the thin film sample, it is found the scattering of the effective Young's modulus at small depths goes far beyond the expectation from effects due to surface roughness alone. Three representative deformation mechanisms during initial contact stage were identified to be responsible for the scattering with the assistance of immediate pre and post indentation atomic force microscopy imaging. Furthermore, repeated loading was found to stiffen the thin film sample, but not the bulk ones.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 841: Symposium R – Fundamentals of Nanoindentation and Nanotribology III , 2004 , R8.7
Copyright
Copyright © Materials Research Society 2005

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References

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