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Residual Stresses in Silicon Nitride Based Composites Using Synchrotron Radiation

Published online by Cambridge University Press:  21 March 2011

Myungae Lee ,
Yanan Xiao ,
Dale E. Wittmer ,
Susan M. Mini  and
Timothy J. Graber
Myungae Lee
Affiliation:
Department of Mechanical Engineering and Energy Processes, Southern Illinois University at Carbondale, Carbondale, IL 62901
Yanan Xiao
Affiliation:
Department of Mechanical Engineering and Energy Processes, Southern Illinois University at Carbondale, Carbondale, IL 62901
Dale E. Wittmer
Affiliation:
Department of Mechanical Engineering and Energy Processes, Southern Illinois University at Carbondale, Carbondale, IL 62901
Susan M. Mini
Affiliation:
Department of Physics, Northern Illinois University, De Kalb, IL 60115 and Material Science Division, Argonne National Laboratory, Argonne, IL 60439
Timothy J. Graber
Affiliation:
The Center for Advanced Radiation Sources, The University of Chicago, Argonne, IL 60439
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Abstract

In order to measure the residual strain (stress) in the silicon nitride based composites, synchrotron based x-ray diffraction was employed on the BESSRC beamline at the APS. The residual stress for both the baseline Si3N4 and the Si3N4-TiN composites were determined from the (441) and (531) reflections, obtained by applying the three-dimensional 2θ-sin2ψ method. In both the baseline Si3N4 and the Si3N4-TiN composites, after thermal shocking, compressive residual stresses were developed in both directions parallel and perpendicular to the specimen's surface. The average residual stresses in the direction parallel to the sample surface were much higher than in the perpendicular direction.

The measured residual stresses were compared with the flexural strength and fracture toughness results to determine the effects of residual stress and thermal shocking on the strength and toughness of each composite. The results suggested that there should be a maximum thermal shock temperature, within the range of 1000 °C to 1100 °C, for improving the fracture toughness for both the baseline Si3N4 and the Si3N4-TiN composites. Also, the addition of the TiN appeared to improve both the strength and toughness of the baseline composition.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 678: Symposia EE – Applications of Synchrotron Radiation Techniques…IV , 2001 , EE2.4.1
Copyright
Copyright © Materials Research Society 2001

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