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Compositional landscape for glass formation in metal alloys

Na, Jong Hyun and Demetriou, Marios D. and Floyd, Michael and Hoff, Andrew and Garrett, Glenn R. and Johnson, William L. (2014) Compositional landscape for glass formation in metal alloys. Proceedings of the National Academy of Sciences of the United States of America, 111 (25). pp. 9031-9036. ISSN 0027-8424. PMCID PMC4078826. doi:10.1073/pnas.1407780111.

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A high-resolution compositional map of glass-forming ability (GFA) in the Ni–Cr–Nb–P–B system is experimentally determined along various compositional planes. GFA is shown to be a piecewise continuous function formed by intersecting compositional subsurfaces, each associated with a nucleation pathway for a specific crystalline phase. Within each subsurface, GFA varies exponentially with composition, wheres exponential cusps in GFA are observed when crossing from one crystallization pathway to another. The overall GFA is shown to peak at multiple exponential hypercusps that are interconnected by ridges. At these compositions, quenching from the high-temperature melt yields glassy rods with diameters exceeding 1 cm, whereas for compositions far from these cusps the critical rod diameter drops precipitously and levels off to 1 to 2 mm. The compositional landscape of GFA is shown to arise primarily from an interplay between the thermodynamics and kinetics of crystal nucleation, or more precisely, from a competition between driving force for crystallization and liquid fragility.

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Additional Information:© 2014 National Academy of Sciences. Contributed by William L. Johnson, May 13, 2014 (sent for review March 7, 2014). Published online before print June 9, 2014. Author contributions: J.H.N., M.D.D., and W.L.J. designed research; J.H.N., M.F., A.H., and G.R.G. performed research; J.H.N., M.D.D., A.H., G.R.G., and W.L.J. analyzed data; and J.H.N., M.D.D., and W.L.J. wrote the paper. The authors declare no conflict of interest. This article contains supporting information online at
Subject Keywords:metallic glass; amorphous alloy; viscosity; glass transition
Issue or Number:25
PubMed Central ID:PMC4078826
Record Number:CaltechAUTHORS:20140616-101603353
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Official Citation:Jong Hyun Na, Marios D. Demetriou, Michael Floyd, Andrew Hoff, Glenn R. Garrett, and William L. Johnson Compositional landscape for glass formation in metal alloys PNAS 2014 111 (25) 9031-9036; published ahead of print June 9, 2014, doi:10.1073/pnas.1407780111
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46276
Deposited By: Tony Diaz
Deposited On:16 Jun 2014 19:56
Last Modified:10 Nov 2021 17:23

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