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

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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. pct., 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 ΔEa (cryst.) = 190 kJ/g-mole.

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Acknowledgments

Support from the Fund for Materials Science at the Barnett Institute is gratefully acknowledged. Our special thanks for DSC measurements go to the Materials Research Laboratory at Harvard University, Cambridge, MA (Mr. Howard Zola and Mr. Frank Molea) and to Chomerics, Inc., Woburn, MA (Mrs. N. Rogan).

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Gokhale, S.V., Marchev, K.G., Nowak, W.B. et al. Au0.80Cu0.10Y0.10, A Gold-Rich Ternary Alloy Glass with Tc > 400°C and its Crystallization Kinetics. MRS Online Proceedings Library 321, 639–643 (1993). https://doi.org/10.1557/PROC-321-639

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  • DOI: https://doi.org/10.1557/PROC-321-639

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