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Moving the Pulsed Heating Technique Beyond Monolithic Specimens: Experiments with Coated Wires

Published

Author(s)

Daniel Josell, D Basak, J L. McClure, Ursula R. Kattner, Maureen E. Williams, William J. Boettinger, M Rappaz

Abstract

Pulsed heating experiments based on pyrometric measurement of the temperature-time history of metal specimens rapidly heated by passage of electric current have a thirty year history at NIST. In recent years, efforts have been made to move beyond the limitations of the standard technique. Specifically, simultaneous polarimetry measurement of the spectral emissivity has permitted study of sheet and wire specimens rather than the costly, black-body geometry specimens previously used. In addition, significant progress has been made toward understanding the melting of alloys under these conditions. This paper presents the results of an effort to expand beyond the macroscopically monolithic, single-phase materials of all previous studies. This includes two independent studies. The first study is of the melting behavior of coatings, including Ti and Ti(Al) alloys, deposited on higher-melting Mo substrates. The second study is of the melting behavior of substrates, Ti and Cr, covered by higher-melting Mo or W/Mo coatings. The results of both studies demonstrate the feasability of such specimen geometries for studying materials that cannot be studied in monolithic form because, for example, they are too brittle, exhibit excessively high vapor pressure, or are simply too costly to manufacture.
Citation
Journal of Materials Research
Volume
16
Issue
No. 8

Keywords

alloys, aluminum, chromium, melting point, rapid melting, titanium

Citation

Josell, D. , Basak, D. , McClure, J. , Kattner, U. , Williams, M. , Boettinger, W. and Rappaz, M. (2001), Moving the Pulsed Heating Technique Beyond Monolithic Specimens: Experiments with Coated Wires, Journal of Materials Research, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=853024 (Accessed April 19, 2024)
Created July 31, 2001, Updated October 12, 2021