Abstract
The uniaxial and biaxial compressive responses of Zr57Nb5Al10Cu15.4Ni12.6–W composite were investigated over a range of strain rates (∼10−3 to 103 s−1) using an Instron universal testing machine (∼10−3 to 10° s−1), drop-weight tower (∼200 s−1), and split Hopkinson pressure bar (103 s−1). The temperature dependence of the mechanical behavior was investigated at temperatures ranging from room temperature to 600 °C using the instrumented drop-weight testing apparatus, mounted with an inductive heating device. The deformed and fractured specimens were examined using optical and scanning electron microscopy. Stopped experiments were used to investigate deformation and failure mechanisms at specified strain intervals in both the drop weight and split Hopkinson bar tests. These stopped specimens were also subsequently examined using optical and scanning electron microscopy to observe shear band and crack formation and development after increasingly more strain. The overall results showed an increase in yield strength with strain rate and a decrease in failure strength, plasticity, and hardening with strain rate. Comparison of uniaxial and biaxial loading showed strong susceptibility to shear failure since the additional 10% shear stress caused failure at much lower strains in all cases. Results also showed a decrease in flow stress and plasticity with increased temperature. Also notable was the anomalous behavior at 450 °C, which lies between the Tg and Tx and is in a temperature regime where homogeneous flow, as opposed to heterogeneous deformation by shear banding, is the dominant mechanism in the bulk metallic glass.
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Acknowledgments
The authors thank Liquidmetal Technologies, Inc., for providing the materials. The authors also thank Norman Herzig, David Musch, Christoph Wollschlaeger, Stefan Syla, and Gunther Muth at the Technical University of Chemnitz (TUC) for their help with performing experiments. This research is funded by Army Research Office (ARO) Grant No. E-48148-MS-000-05123-1 (Dr. Mullins program monitor) and was performed at TUC under a German Academic Exchange Service (DAAD) Research Grant. Morgana Martin is a recipient of a NASA Jenkins Fellowship.
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Martin, M., Meyer, L., Kecskes, L. et al. Uniaxial and biaxial compressive response of a bulk metallic glass composite over a range of strain rates and temperatures. Journal of Materials Research 24, 66–78 (2009). https://doi.org/10.1557/JMR.2009.0003
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DOI: https://doi.org/10.1557/JMR.2009.0003