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Study Of Interfaces In XDTM Al/TiCp Metal Matrix Composites

Published online by Cambridge University Press:  25 February 2011

R. Mitra ,
W. A. Chiou ,
J. R. Weertman ,
M. E. Fine  and
R. M. Aikin Jr
R. Mitra
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, II 60208
W. A. Chiou
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, II 60208
J. R. Weertman
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, II 60208
M. E. Fine
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, II 60208
R. M. Aikin Jr
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, II 60208

Abstract

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The metal-ceramic interface in an XDTM Al/TiCp metal matrix composite has been characterized in as-extruded, recrystallized, and high temperature heat-treated conditions. In both the as-extruded and recrystallized composite, the interface is atomically abrupt. Localized orientation relationships exist between Al and Tic that lead to some degree of coherency at the interface. Recrystallization produces semicoherent interfaces by formation of subgrains in the Al adjacent to the Tie particles. Few interfaces show cracking, even after extensive deformation. Lack of cracking together with the direct contact down to atomic level, observed between the two phases are evidence for excellent bonding between the carbide particles and the aluminum matrix. Heat treating samples at 913 k for 24 hours produces reaction products like Al3Ti and Al4C3. These reactions are explained on the basis of thermodynamic data.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 238: Symposium Cb – Structure and Properties of Interfaces in Materials , 1991 , 871
Copyright
Copyright © Materials Research Society 1992

References

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