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Au0.80Cu0.10Y0.10, A Gold-Rich Ternary Alloy Glass with Tc > 400°C and its Crystallization Kinetics

Published online by Cambridge University Press:  15 February 2011

Sunil V. Gokhale ,
Krassimir G. Marchev ,
Welville B. Nowak  and
Bill C. Giessen
Sunil V. Gokhale
Affiliation:
Department of Mechanical Engineering, Northeastern University, Boston, MA 02115 Barnett Institute of Chemical Analysis and Materials Science, Northeastern University, Boston, MA 02115
Krassimir G. Marchev
Affiliation:
Department of Chemistry, Northeastern University, Boston, MA 02115 Barnett Institute of Chemical Analysis and Materials Science, Northeastern University, Boston, MA 02115
Welville B. Nowak
Affiliation:
Department of Mechanical Engineering, Northeastern University, Boston, MA 02115
Bill C. Giessen
Affiliation:
Department of Mechanical Engineering, Northeastern University, Boston, MA 02115 Department of Chemistry, Northeastern University, Boston, MA 02115 Barnett Institute of Chemical Analysis and Materials Science, Northeastern University, Boston, MA 02115
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Abstract

There are no reported gold-rich alloys that are both readily glass forming (RGF) upon rapid solidification processing (RSP) and, in the glassy state, have crystallization temperatures Tc sufficiently high to insure long metastable life times at room temperature. A representative of a new family of ternary gold-based glasses is described that contain Cu and a rare earth (RE) Metal (or Y), with total addition element concentrations as low as 15 at. pet., and its crystallization characteristics are reported. Under RSP processing by arc furnace hammer-and-anvil quenching, the alloy Au0.80Cu0.10Y0.10 readily forms a ductile glass, with Tc = 685 K, ΔHc = 1.25 kJ/g-Mole and an activation energy of crystallization ΔE3 (cryst.) = 190 kJ/g-Mole.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 321: Symposium E – Crystallization and Related Phenomena in Amorphous Materials—Ceramics, Metals, Polymers, and Semiconductors , 1993 , 639
Copyright
Copyright © Materials Research Society 1994

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References

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