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Analysis of the Structure of Bulk Metallic Glasses Using EXELFST

Published online by Cambridge University Press:  02 July 2020

F.M. Alamgir ,
G. Hug ,
D.B. Williams ,
H. Jain  and
R.B. Schwarz
F.M. Alamgir
Affiliation:
Department of Materials Science and Engineering, Lehigh University, Bethlehem, PA18015USA
G. Hug
Affiliation:
LEM, ONERA, Chattilon, France
D.B. Williams
Affiliation:
Department of Materials Science and Engineering, Lehigh University, Bethlehem, PA18015USA
H. Jain
Affiliation:
Department of Materials Science and Engineering, Lehigh University, Bethlehem, PA18015USA
R.B. Schwarz
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM87545USA
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Extract

There has been a rejuvenation of interest in the field of metallic glasses in the last decade, ever since the discovery of alloy compositions which allow bulk glass formation. By definition, bulk metallic glasses (BMGs) are characterized by a critical cooling rate < 10 K/s or a minimum dimension > 1mm. We have chosen to examine the structure of the Pd-Ni-P system in order to explain, from an atomic structural point of view, its precipitously high glass-forming ability in this system with respect to those of the binary alloys. With three constituent elements the study of the Pd-Ni-P system remains tractable in comparison to other BMGs that often contain five or more elements. This system has a critical cooling rate lower than 1 K/s and is one of the simplest prototypes of a BMG. However, binary alloys of transition metals (e.g. Pd, Ni, Cu) with metalloids (P, Si, etc.) will not form BMGs even though they can be forced to retain a glassy structure with rapid quenching from the liquid phase.

Type
Electron Energy-Loss Spectroscopy (EELS) and Imaging
Information
Microscopy and Microanalysis , Volume 6 , Issue S2: Proceedings: Microscopy & Microanalysis 2000, Microscopy Society of America 58th Annual Meeting, Microbeam Analysis Society 34th Annual Meeting, Microscopical Society of Canada/Societe de Microscopie de Canada 27th Annual Meeting, Philadelphia, Pennsylvania August 13-17, 2000 , August 2000 , pp. 194 - 195
Copyright
Copyright © Microscopy Society of America

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