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Segregant enhanced fracture of mechanics

Faber, K. T. and Hickenbottom, Cynthia C. (1988) Segregant enhanced fracture of mechanics. In: Interfacial structure, properties, and design : symposium held April 5-8, 1988, Reno, Nevada, U.S.A. Materials Research Society Symposium Proceedings. No.122. Materials Research Society , pp. 475-483. ISBN 0931837928. http://resolver.caltech.edu/CaltechAUTHORS:20140916-121838056

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Abstract

The fracture toughness and failure mode of ceramic materials are highly sensitive to the presence of impurities at grain boundaries. Magnesium oxide serves as a model material to investigate fracture with respect to impurity levels at grain boundaries. Lithium fluoride, added to MgO as a sintering aid, is retained as an intergranular phase. By post-fabrication heat treatment, the LiF is removed and a change in fracture mode follows. Transmission and scanning electron microscopy, along with analytical (atomic absorption spectroscopy and selective electrode analysis) and microanalytical (scanning Auger microprobe) techniques are used to follow the progression of LiF with heat treatment. The results of this study are compared to other oxides and carbide systems in which the fracture toughness has also been found to be sensitive to the amount and location of segregants.


Item Type:Book Section
Additional Information:© 1988 Materials Research Society. This work was sponsored by the National Science Foundation under Grant No. DMR 8351476 and National Science Foundation Materials Research Laboratory Grant No. DMR 8418159.
Funders:
Funding AgencyGrant Number
NSFDMR 8351476
NSFDMR 8418159
Record Number:CaltechAUTHORS:20140916-121838056
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140916-121838056
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49744
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:16 Sep 2014 22:51
Last Modified:16 Sep 2014 22:51

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