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Phase Selection During Pulsed Laser Annealing of Fe-V Alloys

Published online by Cambridge University Press:  28 February 2011

J. H. Perepezko ,
D. M. Follstaedt  and
P. S. Peercy
J. H. Perepezko
Affiliation:
University of Wisconsin, 1509 University Avenue, Madison, WI 53706
D. M. Follstaedt
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185-5800
P. S. Peercy
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185-5800
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Abstract

Pulsed laser melting of the low-temperature σ (tetragonal, D8b) phase has been used to generate a liquid undercooled with respect to the melting point of the higher-temperature, equilibrium α (bcc) solid solution in equiatomic Fe-V alloys. From calculations based on reported thermodynamic data and equilibrium transformation temperatures, the metastable melting point of the σ phase is about 1720 K for an Fe-50 at.% V alloy, which is 54 K below the melting temperature of the α phase. During rapid heating of well-annealed σ-phase material with a 30 ns laser pulse to above melt threshold, the σ → α reaction is suppressed, so that the melt zone is undercooled by ∼ 54 K with respect to the equilibrium α phase. The α phase nucleates from the undercooled molten surface layer and is retained during the subsequent rapid cooling (∼ 1010 K/s) because of the relatively sluggish α → σ transformation. X-ray diffraction (Read camera) and TEM identified the α phase in the near-surface after melting σ with incident laser energies (1.0–1.41 J/cm2) which are well above the melt threshold as determined by changes in reflectivity (∼ 0.7 J/cm2). The α phase nucleated from the undercooled liquid within ∼ 20 ns.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 74: Symposium A – Beam-Solid Interactions and Transient Processes , 1986 , 161
Copyright
Copyright © Materials Research Society 1987

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