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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 ,
Hongmei Dang ,
Gongyao Wang ,
Yoshihiko Yokoyama  and
Peter K. Liaw
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.

Keywords

AmorphousNanoindentation
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 7 , July 2009 , pp. 2346 - 2352
Copyright
Copyright © Materials Research Society 2009

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