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Mechanical properties of wood-derived silicon carbide aluminum-alloy composites as a function of temperature

Published online by Cambridge University Press:  31 January 2011

T.E. Wilkes ,
J.Y. Pastor ,
J. Llorca  and
K.T. Faber
T.E. Wilkes
Affiliation:
Department of Materials Science and Engineering, Robert R. McCormick School of Engineering and Applied Science, Northwestern University, Evanston, Illinois 60208-3108
J.Y. Pastor
Affiliation:
Departamento de Ciencia de Materiales, Universidad Politécnica de Madrid, E. T. S. de Ingenieros de Caminos, 28040 Madrid, Spain
J. Llorca
Affiliation:
Departamento de Ciencia de Materiales, Universidad Politécnica de Madrid, E. T. S. de Ingenieros de Caminos, 28040 Madrid, Spain; and Instituto Madrileño de Estudios Avanzados en Materiales (IMDEA-Materiales) E. T. S. de Ingenieros de Caminos, 28040 Madrid, Spain
K.T. Faber*
Affiliation:
Department of Materials Science and Engineering, Robert R. McCormick School of Engineering and Applied Science, Northwestern University, Evanston, Illinois 60208-3108
*
a)Address all correspondence to this author. e-mail: k-faber@northwestern.edu
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Abstract

The mechanical behavior [i.e., stiffness, strength, and toughness (KIC)] of SiC Al–Si–Mg metal–ceramic composites (50:50 by volume) was studied at temperatures ranging from 25 to 500 °C. The SiC phase was derived from wood precursors, which resulted in an interconnected anisotropic ceramic that constrained the pressure melt-infiltrated aluminum alloy. The composites were made using SiC derived from two woods (sapele and beech) and were studied in three orthogonal orientations. The mechanical properties and corresponding deformation micromechanisms were different in the longitudinal (LO) and transverse directions, but the influence of the precursor wood was small. The LO behavior was controlled by the rigid SiC preform and the load transfer from the metal to the ceramic. Moduli in this orientation were lower than the Halpin–Tsai predictions due to the nonlinear and nonparallel nature of the Al-filled pores. The LO KIC agreed with the Ashby model for the KIC contribution of ductile inclusions in a brittle ceramic.

Keywords

CompositeElastic propertiesFracture
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 6 , June 2008 , pp. 1732 - 1743
Copyright
Copyright © Materials Research Society 2008

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