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Pulsed Laser-Induced Melting of Intermediate Cu-Zn Phases

Published online by Cambridge University Press:  25 February 2011

David M. Follstaedt ,
Paul S. Peercy  and
John H. Perepezko
David M. Follstaedt
Affiliation:
Sandia National Laboratories, P. O. Box 5800, Albuquerque, NM 87185
Paul S. Peercy
Affiliation:
Sandia National Laboratories, P. O. Box 5800, Albuquerque, NM 87185
John H. Perepezko
Affiliation:
Dept. Materials Science and Engineering, University of Wisconsin, Madison, WI 53706
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Abstract

We have discovered that the β and γ brasses of Cu-Zn exhibit clearly resolved increases in reflectance upon melting with a 30 ns ruby laser, which allow their melt durations to be readily measured. This system thus offers potential for obtaining quantitative information about the solidification kinetics of metals. We have also found that a heteroepitaxial layer of β' brass is formed on the surface of (ordered) γ brass with 63 wt.% Zn following pulsed laser-induced melting. The β' layer is interpreted to mean that the metastable β phase (bcc) formed on the liquid-solid interface as the γ substrate attempted to regrow, and that β ordered to β' (B2) during cooling. The β formation implies that undercoolings > 16 K were attained during the attempted regrowth of the γ phase.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 157: Symposium A – Beam-Solid Interactions: Physical Phenomena , 1989 , 389
Copyright
Copyright © Materials Research Society 1990

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References

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