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

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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.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee, 37996, USA

    M. Freels, P. K. Liaw & G. Y. Wang

  2. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Science, Shenyang, 110016, PR China

    Q. S. Zhang & Z. Q. Hu

Authors
  1. M. Freels
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  2. P. K. Liaw
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  3. G. Y. Wang
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  4. Q. S. Zhang
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  5. Z. Q. Hu
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Correspondence to P. K. Liaw.

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Freels, M., Liaw, P.K., Wang, G.Y. et al. Stress-life fatigue behavior and fracture-surface morphology of a Cu-based bulk-metallic glass. Journal of Materials Research 22, 374–381 (2007). https://doi.org/10.1557/jmr.2007.0052

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  • DOI: https://doi.org/10.1557/jmr.2007.0052

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