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A Highly Fatigue-Resistant Zr-Based Bulk Metallic Glass

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Abstract

The strength-normalized fatigue endurance strength of the bulk metallic glass (BMG) Zr52.5Cu17.9Ni14.6Al10Ti5 (Vitreloy 105) has been reported to be the highest for any BMG; however, to date, there has been no explanation of why this material is so much better than other Zr-based compositions. In this study, the fatigue-crack growth behavior of Zr52.5Cu17.9Ni14.6Al10Ti5 was compared in ambient air vs dry nitrogen environment. The excellent fatigue life behavior is attributed to a relatively high fatigue threshold (ΔK TH ≈ 2 MPa√m) and a lack of sensitivity to environmental effects on fatigue-crack growth in ambient air, as compared to other Zr-based BMGs. Fatigue life experiments conducted in ambient air confirmed the excellent fatigue life properties with a 107-cycle endurance strength of ~0.24 of the ultimate tensile strength; however, it was also found that casting porosity, even in limited amounts, could reduce this endurance strength by as much as ~60 pct. Overall, the BMG Zr52.5Cu17.9Ni14.6Al10Ti5 appears to have excellent strength and fatigue properties and should be considered as a prime candidate material for future applications where good mechanical fatigue resistance is required.

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Notes

  1. All compositions are given in terms of atomic percent.

  2. The stress amplitude, σ a, is half of the stress range, Δσ = σ min − σ max, where σ min and σ max correspond to the minimum and maximum values of the applied stress.

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Acknowledgments

The authors wish to thank Melissa McGee for aid in sample preparation and testing and Andy Waniuk of Liquidmetal Technologies for help in preparing the BMG plates. Support for BG and ROR was provided by the Director, Office of Science, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. JJK would like to acknowledge the support of the Arthur E. Hitsman Faculty Scholarship.

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Authors and Affiliations

  1. Materials Science Program, School of Mechanical, Industrial, and Manufacturing Engineering, Oregon State University, Corvallis, OR, 97331, USA

    Steven E. Naleway (Graduate Research Assistant), Rawley B. Greene (Graduate Research Assistant) & Jamie J. Kruzic (Associate Professor)

  2. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA

    Bernd Gludovatz (Postdoctoral Fellow), Neil K. N. Dave (Graduate Research Assistant) & Robert O. Ritchie (Professor)

  3. Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, CA, 94720, USA

    Neil K. N. Dave (Graduate Research Assistant) & Robert O. Ritchie (Professor)

Authors
  1. Steven E. Naleway
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  2. Rawley B. Greene
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  3. Bernd Gludovatz
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  4. Neil K. N. Dave
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  5. Robert O. Ritchie
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  6. Jamie J. Kruzic
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Corresponding author

Correspondence to Jamie J. Kruzic.

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Manuscript submitted February 8, 2013.

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Naleway, S.E., Greene, R.B., Gludovatz, B. et al. A Highly Fatigue-Resistant Zr-Based Bulk Metallic Glass. Metall Mater Trans A 44, 5688–5693 (2013). https://doi.org/10.1007/s11661-013-1923-4

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  • DOI: https://doi.org/10.1007/s11661-013-1923-4

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