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Stress-life fatigue behavior and fracture-surface morphology of a Cu-based bulk-metallic glass

Published online by Cambridge University Press:  03 March 2011

M. Freels ,
P.K. Liaw ,
G.Y. Wang ,
Q.S. Zhang  and
Z.Q. Hu
M. Freels
Affiliation:
Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996
P.K. Liaw*
Affiliation:
Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996
G.Y. Wang
Affiliation:
Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996
Q.S. Zhang
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Science, Shenyang 110016, PR China
Z.Q. Hu
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Science, Shenyang 110016, PR China
*
a) Address all correspondence to this author. e-mail: pliaw@utk.edu
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Abstract

The stress-life fatigue behavior and fracture morphology of a (Cu60Zr30Ti10)99Sn1 bulk-metallic glass alloy was investigated under both three-point and four-point bending conditions. For all stress levels tested, the fatigue lifetimes tended to be higher for the three-point loading condition. The fatigue endurance limits (defined as 107 cycles without failure), based on the applied stress range, for three-point and four-point loading conditions were approximately 475 MPa and 350 MPa, respectively. All fracture surfaces were found to be composed of four main regions: a crack-initiation site, a stable crack-growth region, an unstable fast-fracture region, and a melting region. Finely spaced parallel marks, similar to fatigue striations found in crystalline alloys, oriented somewhat perpendicular to the direction of crack propagation were observed in the stable crack-growth region. Analyses of these marks found that their spacing increased with increasing stress-intensity-factor range. Damage was found to initiate from preexisting defects present on or near the surface.

Keywords

AmorphousScanning electron microscopy (SEM)Toughness
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 2 , September 2006 , pp. 374 - 381
Copyright
Copyright © Materials Research Society 2007

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