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Impact of X-Ray Tomographic Microscopy on Deformation Studies of a SiC/Al MMC

Published online by Cambridge University Press:  22 February 2011

T.M. Breunig ,
S.R. Stock ,
J.H. Kinney ,
A. Guvenilir  and
M.C. Nichols
T.M. Breunig
Affiliation:
Mechanical Properties Research Laboratory and School of Materials Engineering, Georgia Institute of Technology, Atlanta, GA 30332–0245
S.R. Stock
Affiliation:
Mechanical Properties Research Laboratory and School of Materials Engineering, Georgia Institute of Technology, Atlanta, GA 30332–0245
J.H. Kinney
Affiliation:
Chemistry and Materials Science Department, Lawrence Livermore National Laboratory, Livermore, CA 94550
A. Guvenilir
Affiliation:
Mechanical Properties Research Laboratory and School of Materials Engineering, Georgia Institute of Technology, Atlanta, GA 30332–0245
M.C. Nichols
Affiliation:
Materials Department, Sandia National Laboratory, Livermore, CA 94550.
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Abstract

Damage in a continuous, aligned-fiber SiC/Al metal matrix composite (MMC), e.g. fiber fracture, fiber-matrix interphase microcracking, intra-ply matrix voids and cracks, is examined with synchrotron x-ray tomographic microscopy (XTM). Quantitative three-dimensional measurements of damage are reported in as-fabricated and monotonically loaded SiC/Al. The XTM results indicate that increases in observed macroscopic structural stiffness during the first few fatigue cycles of an MMC coupon correspond to elimination of processing-related matrix porosity and to displacement of the fibers from a somewhat irregular arrangement into a more nearly hexagonal array. The XTM data also show that the carbon cores of the SiC fibers begin to fail at or below 828 MPa, that is, at loads far less than those for fracture of the entire fiber. The implications of these results and of the use of in situ loading for fatigue damage quantification are also discussed for mechanical/thermal modelling.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 217: Symposium U – Advanced Tomographic Imaging Methods for the Analysis of Materials , 1990 , 135
Copyright
Copyright © Materials Research Society 1991

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References

REFERENCES

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