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Some observations of microstructural changes in alumina induced by Ti inhomogeneities

Published online by Cambridge University Press:  31 January 2011

V. Jayaram ,
B. J. Dalgleish  and
A. G. Evans
V. Jayaram
Affiliation:
Materials Department, College of Engineering, University of California, Santa Barbara, Califorina 93106
B. J. Dalgleish
Affiliation:
Materials Department, College of Engineering, University of California, Santa Barbara, Califorina 93106
A. G. Evans
Affiliation:
Materials Department, College of Engineering, University of California, Santa Barbara, Califorina 93106
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Abstract

Analysis of Ti-containing heterogeneities in a hot-pressed Al2O3 has revealed changes in microstructure caused by oxidation that provide some insight regarding the effects of Ti on local grain growth. The most consistent hypothesis is that Ti4+ in solution compensates the Mg2+ ion taken into solution from the MgO additive, probably by forming dipoles, and negates the effect of Mg2+ on grain boundary drag.

Type
Articles
Information
Journal of Materials Research , Volume 3 , Issue 4 , August 1988 , pp. 764 - 771
Copyright
Copyright © Materials Research Society 1988

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References

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