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Nucleation of Allotropic Phases During Pulsed Laser Annealing of Manganese

Published online by Cambridge University Press:  26 February 2011

J. H. Perepezko ,
D. M. Follstaedt  and
P. S. Peercy
J. H. Perepezko
Affiliation:
University of Wisconsin, Madison, Wisconsin 53706
D. M. Follstaedt
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico 87185
P. S. Peercy
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico 87185
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Abstract

Manganese has four allotropes with an equilibrium melting point of the high temperature δ-phase at 1517 K and calculated metastable melting points for the ϒ, β and α phases at 1501 K, 1481 K and 1395 K, respectively. Our observations for Mn irradiated with a pulsed laser and supporting estimates of maximum allotropic transition rates indicate that transformations between allotropes are suppressed during heating with ~ 25 ns laser pulses, as well as during subsequent cooling. Upon pulsed heating of β-Mn to the melt threshold, the melt is undercooled 122 K below the δ-Mn melting point. For incident laser pulse energy densities near the melting threshold, resolidification involves regrowth of β-Mn from the substrate. At energy densities well above threshold, the ϒ-Mn phase forms by separate nucleation and growth from the undercooled melt, and is retained upon rapid solidification. From these results and analyses, we conclude that significant melt undercooling, which may exceed 100 K, can occur during pulsed laser melting of metallic crystals and that the resulting crystalline structure is determined by both thermodynamics and nucleation kinetics.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 51: Symposium A – Beam-Solid Interactions and Phase Transformations , 1985 , 297
Copyright
Copyright © Materials Research Society 1985

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References

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