Abstract
The effects of mixed mode loading on the fracture behavior of Zr-based bulk metallic glasses (BMGs) (Vitreloy I and Vitreloy 106) were investigated. Mixed mode I/II and mixed mode I/III fracture conditions were tested using both notched and fatigue-precracked specimens. Fully amorphous samples exhibited tremendous increases in fracture energy with the application of mixed mode loading, while partially crystalline samples exhibited more modest increases. A comparison to the behavior of other material systems (e.g., polymers, ceramics, crystalline metals, and composites) illustrates the tremendous increase in fracture energy exhibited by these BMGs under mixed mode loading conditions.
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Notes
Vitreloy is the trademark of Liquidmetal Technologies, Lake Forest, CA.
PHILIPS is a trademark of Philips Electronic Instruments Corp., Mahwah, NJ.
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Acknowledgments
The authors gratefully acknowledge the supply of initial materials from Dr. A. Peker, Amorphous Technologies International, Inc. (ATI) (Laguna Niquel, CA), and helpful interactions with Professor W.L Johnson, Keck Laboratory of Engineering Materials, California Institute of Technology (Pasadena, CA). More recent materials have been provided by Liquidmetal Technologies. Discussions with Professors A. Argon and F. Spaepan are also gratefully acknowledged. The early parts of this project were under the financial support of Airforce Office of Scientific Research—Augumentation for Science and Engineering Research Training (AFOSR-AASERT) Grant No. F49420-96-1-0228 and the Howmet Corporation (Whitehall, MI), followed by more recent support via the Defense Advanced Research Projects Agency (DARPA) Structural Amorphous Metals (SAM) program through Grant No. ONR-N00014-03-1-0205 and a subcontract with the California Institute of Technology through Grant No. ARO-DAAD19-19-01-1-1525. One author (JJL) appreciates the helpful discussions and references provided by Professor J.F. Knott (University of Birmingham, UK). Approved for public release. Distribution unlimited.
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Manuscript submitted April 1, 2009.
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Varadarajan, R., Thurston, A.K. & Lewandowski, J.J. Increased Toughness of Zirconium-Based Bulk Metallic Glasses Tested under Mixed Mode Conditions. Metall Mater Trans A 41, 149–158 (2010). https://doi.org/10.1007/s11661-009-0059-z
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DOI: https://doi.org/10.1007/s11661-009-0059-z