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Superplastic behavior of a kappa carbide material (Fe3AlCx)

Published online by Cambridge University Press:  31 January 2011

Woo-Jin Kim ,
Oscar A. Ruano ,
Jeffrey Wolfenstine ,
Georg Frommeyer  and
Oleg D. Sherby
Woo-Jin Kim
Affiliation:
Department of Metallurgy and Materials Science, Hong-Ik University, 72–1 Sangsu-Dong, Mapo-Ku, Seoul, 121–791, Korea
Oscar A. Ruano
Affiliation:
Department of Physical Metallurgy, CENIM, C.S.I.C., Av. Gregorio del Amo 8, 28040 Madrid, Spain
Jeffrey Wolfenstine
Affiliation:
Department of Chemical and Biochemical Engineering, University of California, Irvine, California 92717
Georg Frommeyer
Affiliation:
Max Planck Institut für Eisenforschung, GmbH, Max Planck Strasse 1, D-40237, Germany
Oleg D. Sherby
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, California 94305
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Abstract

Fine-grained kappa carbide (Fe3AlCx) materials, containing 12.5 and 14% Al, and 3.5% C, were prepared by powder processing and hipping procedures. The creep behavior of the kappa materials was shown to be identical to that observed in superplastic iron carbide, and was shown to follow a grain boundary–diffusioncontrolled grain boundary sliding relation. The tensile fracture strains in kappa, however, were shown to be considerably less than in iron carbide with a maximum elongation of 92% noted. This difference is attributed to either a low stress intensity factor or to contamination of the powder surface in the kappa material. The compression creep strength, at a given strain rate, was shown to be about two times higher than the tension creep strength.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 9 , September 1997 , pp. 2317 - 2324
Copyright
Copyright © Materials Research Society 1997

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References

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