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Indentation behavior of a ZCAP-3 bulk metallic glass: Effects of the fatigue deformation

Published online by Cambridge University Press:  31 January 2011

Fuqian Yang*
Affiliation:
Department of Chemical and Materials Engineering, University of Kentucky, Lexington, Kentucky 40506
Hongmei Dang
Affiliation:
Department of Chemical and Materials Engineering, University of Kentucky, Lexington, Kentucky 40506
Gongyao Wang
Affiliation:
Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37994
Yoshihiko Yokoyama
Affiliation:
Advanced Research Center of Metallic Glasses, Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
Peter K. Liaw
Affiliation:
Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37994
*
a) Address all correspondence to this author. e-mail: fyang0@engr.uky.edu
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Abstract

The effects of the fatigue deformation on the localized deformation of a ZCAP-3 bulk metallic glass (BMG) were studied using the nanoindentation technique. A localized mechanical hardening was observed in the ZCAP-3 BMG between the shear bands in the fatigue-damaged zone. In contrast to the indentations of the BMG made far away from the fatigue-damaged zone, there was no indentation size effect. Both the reduced contact modulus and the indentation hardness were larger than those corresponding to the indentations of the ZCAP-3 BMG in the undamaged zone. These observations revealed the possible effects of local heating and stress-induced atomic rearrangements (i.e., inelastic deformation) on the reduction of the free volume in the BMG from the propagation of the fatigue crack.

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Articles
Copyright
Copyright © Materials Research Society 2009

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