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The Role of Crystallization of an Intergranular Glassy Phase in Determining Grain Boundary Residual Stresses in Debased Aluminas

Published online by Cambridge University Press:  21 February 2011

Nitin P. Padture ,
Helen M. Chan ,
Brian R. Lawn  and
Michael J. Readey
Nitin P. Padture
Affiliation:
Department of Materials Science and Engineering, Whitaker Lab # 5, Lehigh University, Bethlehem, PA 18015
Helen M. Chan
Affiliation:
Department of Materials Science and Engineering, Whitaker Lab # 5, Lehigh University, Bethlehem, PA 18015
Brian R. Lawn
Affiliation:
Ceramics Division, Bldg. # 223, National Institute of Standards and Technology, Gaithersburg, MD 20899
Michael J. Readey
Affiliation:
Coors Ceramics Company, 17750, 32nd Avenue, Golden, CO 80401
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Abstract

The influence of microstructure on the crack resistance (R-curve) behavior of a commercial debased alumina containing large amounts of glassy phase (28 vol %) has been studied using the Indentation-Strength test. The effect of two microstructural variables, viz. grain size and the nature of the intergranular second phase (glassy or crystalline) has been evaluated. Crystallization of the intergranular glass was carried out in order to generate residual stresses at the grain boundaries, which have been shown to enhance R-curve behavior in ceramic materials. Enhancement of the R-curve behavior was observed with the increase in grain size. However, no effect of the nature of the intergranular second phase on the R-curve behavior, in small and large grain materials, was observed. The results from characterization of these materials using various analytical techniques is presented, together with possible explanations for the observed effects.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 170: Symposium N – Interfaces in Composites , 1989 , 245
Copyright
Copyright © Materials Research Society 1990

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