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Study of the Size Dependence of Time-dependent Plastic Deformation of Gold Micro-pillars and Micro-spheres

Published online by Cambridge University Press:  21 May 2013

AZM Ariful Islam  and
Robert J. Klassen
AZM Ariful Islam
Affiliation:
Department of Mechanical & Materials Engineering, Western University, London, Ontario, N6A 3K7, Canada.
Robert J. Klassen
Affiliation:
Department of Mechanical & Materials Engineering, Western University, London, Ontario, N6A 3K7, Canada.
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Abstract

In this study the length scale dependence of the operative mechanisms of time-dependent plastic deformation was studied using room temperature compression tests performed on Au micro-pillars and micro-spheres of 1.0 to 5.0 µm diameter. All the samples tested displayed deformation that had a component of random strain jumps. In the case of the Au micro-pillars, the frequency of the strain jumps showed a bilinear dependence upon pillar diameter with the frequency being larger, and more sensitive to diameter, when the pillar diameter was small (and τR was high). We suggest that this indicates a transition from deformation occurring by deformation on multiple slip planes to deformation occurring predominantly by single-plane dislocation slip when the pillar diameter is less than 2 µm.

The strain jump frequency during the constant-load micro-pillar creep tests showed a linear dependence upon τR. Creep tests performed on the micro-spheres of 5.0 µm diameter displayed displacement jump frequency that was essentially independent of the applied load while the jump frequency increased with increasing load for the smaller 2.5 µm diameter micro-spheres. We suggest that this difference is related to the volume of the micro-sphere. When the volume is small, the component of the deformation that occurs by a stochastic dislocation glide process is increased and becomes strongly dependent upon the magnitude of the local shear stress.

Keywords

nano-indentationmicrostructurestress/strain relationship
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1580: Symposium BBB – Size-Dependent and Coupled Properties of Materials , 2013 , mrss13-1580-bbb08-03
Copyright
Copyright © Materials Research Society 2013 

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