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Time-Resolved, Laser-Induced Phase Transformation inAluminum

Published online by Cambridge University Press:  25 February 2011

S. Williamson ,
G. Mourou  and
J.C.M. Li
S. Williamson
Affiliation:
Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, NY 14623-1299 :River
G. Mourou
Affiliation:
Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, NY 14623-1299 :River
J.C.M. Li
Affiliation:
Department of Mechnical Engineering, University of Rochester, 250 East River Road, Rochester, NY 14623-1299 50 EAST
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Abstract

The technique of picosecond electron diffraction is used to time resolve thelaser-induced melting of thin aluminum films. It is observed that underrapid heating conditions, the long range order of the lattice subsists forlattice temperatures well above the equilibrium point, indicative ofsuperheating. This superheating can be verified by directly measuring thelattice temperature. The collapse time of the long range order is measuredand found to vary from 20 ps to several nanoseconds according to the degreeof superheating. Two interpretations of the delayed melting are offered,based on the conventional nucleation and point defect theories. While thenucleation theory provides an initial nucleus size and concentration formelting to occur, the point defect theory offers a possible explanation forhow the nuclei are originally formed.

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References

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