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The Influence of Fiber/Matrix Interface on the Mechanical Behavior of Nicalon SiC Fiber Reinforced Glass-Ceramic Composites

Published online by Cambridge University Press:  10 February 2011

Y. M. Liu ,
T. E. Mitchell  and
H. N. G. Wadley
Y. M. Liu
Affiliation:
Center for Materials Science, Mail Stop K 765, Los Alamos National Laboratory, Los Alamos, NM 87545
T. E. Mitchell
Affiliation:
Center for Materials Science, Mail Stop K 765, Los Alamos National Laboratory, Los Alamos, NM 87545
H. N. G. Wadley
Affiliation:
Department of Materials Science and Engineering, School of Engineering and Applied Science, University of Virginia, Charlottesville, VA 22903
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Abstract

The mechanical properties of unidirectional Nicalon SiC fiber reinforced calcium aluminosilicate (CAS/SiC) and magnesium aluminosilicate (MAS/SiC) glass-ceramic composites have been investigated by tensile testing and a nondestructive laser-ultrasound technique. The barium-stuffed MAS was either undoped or doped with 5% borosilicate glass. The degradation of the elastic stiffness constant Cu in the transverse direction due to interface damage was monitored in-situ by measuring the laser-generated ultrasound wave velocity. The three composite materials show distinctly different macroscopic deformation characteristics, which are correlated strongly to the interface degradation. A stronger reduction trend of the elastic constant ?? is associated with a larger degree of inelastic deformation. Observations of the fracture surfaces also reveal the close relation between fiber pullout length and interfacial characteristics. Interfaces of these composites have been studied by TEM, and their influence on inhibiting and deflecting matrix cracks is discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 458: Symposium W – Interfacial Engineering for Optimized Properties , 1996 , 161
Copyright
Copyright © Materials Research Society 1997

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References

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