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Indentation strain burst phenomenon induced by grain boundaries in niobium

Published online by Cambridge University Press:  03 March 2011

M.G. Wang  and
A.H.W. Ngan
M.G. Wang
Affiliation:
Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road,Hong Kong, People’s Republic of China; and College of Science, Northeastern University, Shenyang 110006, People’s Republic of China
A.H.W. Ngan*
Affiliation:
Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road,Hong Kong, People’s Republic of China
*
a)Address all correspondence to this author.e-mail: hwngan@hkucc.hku.hk
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Abstract

Using depth-sensing indentation, a pop-in phenomenon induced by grain boundaries, namely, a sudden indenter displacement jump when indented near a grain boundary segment, was observed in polycrystalline niobium. This grain-boundary type of pop-in occurs at a larger force than the initial elasto-plastic pop-in, which is observed with and without a grain boundary nearby. The experimental results show that this pop-in effect has a close relationship with the misorientation across the grain boundary. The occurrence of this pop-in phenomenon is rationalized in terms of slip transmission across the grain boundary.

Keywords

NanoindentationHardnessGrain boundaries
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 8 , August 2004 , pp. 2478 - 2486
Copyright
Copyright © Materials Research Society 2004

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