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Moving the pulsed heating technique beyond monolithic specimens: Experiments with coated wires

Published online by Cambridge University Press:  31 January 2011

D. Josell ,
D. Basak ,
J. L. McClure ,
U. R. Kattner ,
M. E. Williams ,
W. J. Boettinger  and
M. Rappaz
D. Josell
Affiliation:
Metallury Division, National Institute of Standards and Technology, Gaithersburg, Maryland
D. Basak
Affiliation:
Metallury Division, National Institute of Standards and Technology, Gaithersburg, Maryland
J. L. McClure
Affiliation:
Metallury Division, National Institute of Standards and Technology, Gaithersburg, Maryland
U. R. Kattner
Affiliation:
Metallury Division, National Institute of Standards and Technology, Gaithersburg, Maryland
M. E. Williams
Affiliation:
Metallury Division, National Institute of Standards and Technology, Gaithersburg, Maryland
W. J. Boettinger
Affiliation:
Metallury Division, National Institute of Standards and Technology, Gaithersburg, Maryland
M. Rappaz
Affiliation:
Department of Materials, Ecole Polytechnique Federal Lausanne, Lausanne, Switzerland
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Abstract

Pulsed heating experiments that measure high-temperature thermophysical properties using pyrometric measurement of the temperature–time history of metal specimens rapidly heated by passage of electric current have a 30-year history at the National Institute of Standards and Technology. In recent years, efforts have been made to move beyond the limitations of the standard technique of using costly, black-body geometry specimens. Specifically, simultaneous polarimetry measurement of the spectral emissivity has permitted study of sheet and wire specimens. This paper presents the results of two efforts to expand beyond the macroscopically monolithic, single-phase materials of all previous studies. In the first study the melting temperatures of coatings, including Ti and Ti(Al) alloys, deposited on higher melting Mo substrates are measured. In the second study the melting temperatures of substrates, Ti and Cr, covered by higher melting W and Mo coatings are measured.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 8 , August 2001 , pp. 2421 - 2428
Copyright
Copyright © Materials Research Society 2001

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