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Near-threshold fatigue crack growth in bulk metallic glass composites

Published online by Cambridge University Press:  31 January 2011

Kombaiah Boopathy ,
Douglas C. Hofmann ,
William L. Johnson  and
Upadrasta Ramamurty
Kombaiah Boopathy
Affiliation:
Department of Materials Engineering, Indian Institute of Science, Bangalore-560012, India
Douglas C. Hofmann
Affiliation:
Keck Laboratory for Engineering Materials, California Institute of Technology, Pasadena, California 91125; and Liquidmetal Technologies, 30452 Esperanza, Rancho Santa Margarita California 92688
William L. Johnson
Affiliation:
Keck Laboratory for Engineering Materials, California Institute of Technology, Pasadena, California 91125
Upadrasta Ramamurty*
Affiliation:
Department of Materials Engineering, Indian Institute of Science, Bangalore-560012, India
*
a) Address all correspondence to this author. e-mail: ramu@materials.iisc.ernet.in
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Abstract

A major drawback in using bulk metallic glasses (BMGs) as structural materials is their extremely poor fatigue performance. One way to alleviate this problem is through the composite route, in which second phases are introduced into the glass to arrest crack growth. In this paper, the fatigue crack growth behavior of in situ reinforced BMGs with crystalline dendrites, which are tailored to impart significant ductility and toughness to the BMG, was investigated. Three composites, all with equal volume fraction of dendrite phases, were examined to assess the influence of chemical composition on the near-threshold fatigue crack growth characteristics. While the ductility is enhanced at the cost of yield strength vis-à-vis that of the fully amorphous BMG, the threshold stress intensity factor range for fatigue crack initiation in composites was found to be enhanced by more than 100%. Crack blunting and trapping by the dendritic phases and constraining of the shear bands within the interdendritic regions are the micromechanisms responsible for this enhanced fatigue crack growth resistance.

Keywords

FatigueAmorphousComposite
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 12 , December 2009 , pp. 3611 - 3619
Copyright
Copyright © Materials Research Society 2009

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