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Effects of focused-ion-beam irradiation and prestraining on the mechanical properties of FCC Au microparticles on a sapphire substrate

Published online by Cambridge University Press:  26 July 2011

Seok-Woo Lee ,
Dan Mordehai ,
Eugen Rabkin  and
William D. Nix
Seok-Woo Lee*
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, California 94305-4034
Dan Mordehai
Affiliation:
Department of Materials Engineering, Technion-Israel Institute of Technology, 32000 Haifa, Israel
Eugen Rabkin
Affiliation:
Department of Materials Engineering, Technion-Israel Institute of Technology, 32000 Haifa, Israel
William D. Nix
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, California 94305-4034
*
a)Address all correspondence to this author. e-mail address: swlee49@stanford.edu
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Abstract

We have studied the effects of focused-ion-beam (FIB) irradiation and prestraining on the mechanical properties of nearly defect-free Au microparticles on a sapphire substrate. The Au microparticles, which were produced by a solid-state diffusion dewetting technique, were FIB-irradiated and/or prestrained, the latter using a nanoindenter with a flat ended punch operating under a nanohammering mode. Also, the prestrained Au microparticles were exposed to FIB to examine the effects of ion-beam damage on the properties of crystals containing mobile dislocations. We found that both FIB irradiation and prestraining reduced the yield strength of pristine Au microparticles significantly and made the stress–strain curves jerky. However, FIB irradiation does not affect the mechanical properties of prestrained Au microparticles very significantly. Once a microparticle contains mobile dislocations, its mechanical properties are not influenced much by the defects generated by FIB irradiation, even at the submicrometer scale.

Keywords

DislocationsStrengthRadiation effects
Type
Invited feature paper
Information
Journal of Materials Research , Volume 26 , Issue 14 , 28 July 2011 , pp. 1653 - 1661
Copyright
Copyright © Materials Research Society 2011

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