High copper content bulk glass formation in bimetallic Cu-Hf system
- Creators
- Duan, Gang
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Xu, Donghua
- Johnson, William L.
Abstract
We report in this article that strip-shaped amorphous samples with thicknesses from 0.5 to 2 mm were successfully synthesized for binary Cu-Hf alloys containing 60 to 68 at. pct Cu by the traditional copper mold casting method. The best glass former Cu₆₆Hf₃₄ with casting thickness up to 2 mm has an undercooled liquid region (ΔT=T_x –T_g , where T_g is the glass transition temperature and T_x is the onset temperature of the first crystallization event) of 51 K, which is somewhat narrow compared with other neighboring alloys in the same system. The bulk glassy Cu₆₆Hf₃₄ alloy exhibits Vicker's Hardness (H_v ) ∼779 kg/mm², Young's modulus ∼108 GPa, fracture strength ∼2.1 GPa, and an almost constant elastic elongation ∼1.8 pct upon compression. The discovery of Cu₆₆Hf₃₄ as a bulk glass confirms the existence of rather simple bulk-glass-forming metallic systems. Moreover, the present Cu-Hf alloys may be the highest copper content bulk metallic glasses reported to date, to the best of our knowledge.
Additional Information
© 2005 Springer. Received 25 March 2004. The authors thank the Defense Advanced Research Projects Agency (DARPA), Defense Sciences Office, for support under ARO Grant No. DAAD19-01-0525. Carol Garland is also acknowledged for her help with the TEM analysis.Additional details
- Eprint ID
- 101451
- DOI
- 10.1007/s11661-005-0316-8
- Resolver ID
- CaltechAUTHORS:20200221-092741191
- Defense Advanced Research Projects Agency (DARPA)
- DAAD19-01-0525
- Army Research Office (ARO)
- Created
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2020-02-21Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field