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Universal Scaled Strength Behaviour for Micropillars and Nanoporous Materials

Published online by Cambridge University Press:  31 January 2011

Brian Derby  and
Rui Dou
Brian Derby
Affiliation:
brian.derby@manchester.ac.uk, Materials Science Centre, The University of Manchester, School of Materials, Manchester, United Kingdom
Rui Dou
Affiliation:
rui.dou@postgrad.manchester.ac.ukruidou6@hotmail.com, Materials Science Centre, The University of Manchester, School of Materials, Manchester, United Kingdom
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Abstract

The strength of submicron FCC structure metal columns, σ, fabricated by FIB machining or electrodeposition, shows a strong correlation with specimen diameter, d, with σ/μ = A(d/b)−0.63, where A is a constant, μ is the single crystal shear modulus resolved onto the slip system and b is the Burgers' vector. The strength of BCC structure metals does not show such a well defined correlation with size across different metals but the data occupies the same region of parameter space as with the FCC metals. Nanoporous gold specimens show a similar size-correlated behaviour but with an exponent of −0.5. This may indicate different mechanisms operating in each case.

Keywords

Austrengthnanoscale
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1185: Symposium II – Probing Mechanics at Nanoscale Dimensions , 2009 , 1185-II07-03
Copyright
Copyright © Materials Research Society 2009

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