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Phase Selection in Undercooled Liquids of Pulsed-Laser Melted Alloys

Published online by Cambridge University Press:  26 February 2011

D. M. Follstaedt ,
P. S. Peercy  and
J. H. Perepezko
D. M. Follstaedt
Affiliation:
Sandia National Laboratories, Division 1112, Albuquerque, NM 87185-5800
P. S. Peercy
Affiliation:
Sandia National Laboratories, Division 1112, Albuquerque, NM 87185-5800
J. H. Perepezko
Affiliation:
University of Wisconsin, Department of Metallurgical and Mineral Engineering, 1509 University Ave., Madison, WI 53706
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Abstract

The use of thermodynamic analysis of phase relationships to identify metastable conditions for generating undercooled liquids by pulsed laser melting, and to interpret the resulting microstructures is illustrated from studies of Mn, FeV and TiAl. Phases with simple, disordered structures are found to nucleate and grow within tens of nanoseconds in liquids undercooled by 50–100 K. An extended transformation depth is found in which the stable high-temperature a phase replaces the metastable a phase in FeV due to the heat release from the rapidly forming a phase. The formation of the disordered bcc structure and of a metallic glass in the melt of the ordered compound γ-TiAl indicate that regrowth of this phase is sufficiently slow to generate undercoolings of – 1000 K.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 100: Symposium – A Fundamentals of Beam-Solid Interactions and Transient Thermal Processing , 1988 , 573
Copyright
Copyright © Materials Research Society 1988

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