Abstract
The interplay between chemical composition, plastic behavior, and fracture modes of Cu46.5Zr46.5Al7 and Cu46.5Zr41.5Al7Y5 bulk metallic glasses (BMGs) was investigated by compression tests and fracture surfaces analyses. The aim was to explore the possibility of coupling physical, chemical, and hardness properties, with adequate macroscopic compressive plasticity. Cylindrical test samples, having a height-to-diameter ratio equal to 2, were machined and ground from as-cast bars and were tested in compression between lubricated plates, the displacement being measured by a clip-gage inserted between the plates. Y free BMG engineering stress-strain curves show a plastic behavior consisting of successive sudden stress drops and linear reloading segments. A detailed analysis of these features was performed to yield a correlation between the plastic deformation steps and the released elastic energy associated with each serration.
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Acknowledgments
The authors express their appreciation to Professor Jürgen Eckert and Dr. Jayanta Das for the useful discussions and the help in sample preparation. This program was supported by the Regione Piemonte (Italy) under Contract No. D-23.
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This article is based on a presentation given in the symposium “Bulk Metallic Glasses VI,” which occurred during the TMS Annual Meeting, February 15–19, 2009, in San Francisco, CA, under the auspices of TMS, the TMS Structural Materials Division, TMS/ASM: Mechanical Behavior of Materials Committee.
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Matteis, P., Russo Spena, P., Pozzi, C. et al. Fracture Behavior in Cu46.5Zr46.5Al7 and Cu46.5Zr41.5Al7Y5 Bulk Metallic Glasses. Metall Mater Trans A 41, 1767–1774 (2010). https://doi.org/10.1007/s11661-010-0266-7
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DOI: https://doi.org/10.1007/s11661-010-0266-7