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Formation of Metastable Disordered Ni3Al by Pulsed Laser Induced Rapid Solidification

Published online by Cambridge University Press:  26 February 2011

Jeffrey A. West ,
James T. Manos  and
Michael J. Aziz
Jeffrey A. West
Affiliation:
Division of Applied Sciences, Harvard University, Cambridge, MA 02138.
James T. Manos
Affiliation:
Division of Applied Sciences, Harvard University, Cambridge, MA 02138.
Michael J. Aziz
Affiliation:
Division of Applied Sciences, Harvard University, Cambridge, MA 02138.
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Abstract

Thin films of Ni3Al formed by co-evaporation onto insulating substrates form a single phase fcc disordered lattice upon rapid solidification following excimer laserinduced melting with an interface velocity of ~4 m/s. Transmission Electron Microscopy (TEM) and x-ray diffraction (XRD) analyses exhibit no superlattice diffraction at room temperature. Resistivity measurements, indicating that the disordered phase has a higher resistivity and much smaller temperature coefficient at room temperature than the stable ordered (L12) phase, permit us to monitor phase changes and ordering on a fast time-scale. Subsequent annealing recovers long-range order, with resistivity measurements indicating that reordering begins just below 300°C.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 213: Symposium Q – High-Temperature Ordered Intermetallic Alloys IV , 1990 , 859
Copyright
Copyright © Materials Research Society 1991

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References

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