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Free-volume dependent pressure sensitivity of Zr-based bulk metallic glass

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Abstract

Instrumented indentation experiments on a Zr-based bulk metallic glass (BMG) in as-cast, shot-peened and structurally relaxed conditions were conducted to examine the dependence of plastic deformation on its structural state. Results show significant differences in hardness, H, with structural relaxation increasing it and shot peening markedly reducing it, and slightly changed morphology of shear bands around the indents. This effect is in contrast to uniaxial compressive yield strength, σy, which remains invariant with the change in the structural state of the alloys investigated. The plastic constraint factor, C = H/σy, of the relaxed BMG increases compared with that of the as-cast glass, indicating enhanced pressure sensitivity upon annealing. In contrast, C of the shot-peened layer was found to be similar to that observed in crystalline metals, indicating that severe plastic deformation could eliminate pressure sensitivity. Microscopic origins for this result, in terms of shear transformation zones and free volume, are discussed.

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Authors and Affiliations

  1. Department of Materials, ETH Zurich, Laboratory of Metal Physics and Technology, 8093, Zurich, Switzerland

    Alban Dubach

  2. EMPA Materials Science and Technology, 3602, Thun, Switzerland

    Alban Dubach, Rejin Raghavan, Jörg F. Löffler & Johann Michler

  3. Department of Materials Engineering, Indian Institute of Science, Bangalore, 560012, India

    K. Eswar Prasad, Rejin Raghavan & Upadrasta Ramamurty

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  1. Alban Dubach
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  2. K. Eswar Prasad
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  3. Rejin Raghavan
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  4. Jörg F. Löffler
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  5. Johann Michler
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  6. Upadrasta Ramamurty
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Correspondence to Upadrasta Ramamurty.

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Dubach, A., Prasad, K.E., Raghavan, R. et al. Free-volume dependent pressure sensitivity of Zr-based bulk metallic glass. Journal of Materials Research 24, 2697–2704 (2009). https://doi.org/10.1557/jmr.2009.0304

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  • DOI: https://doi.org/10.1557/jmr.2009.0304

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