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Toughness determination of zirconia toughened alumina ceramics from growth of indentation-induced cracks

Published online by Cambridge University Press:  31 January 2011

D. Basu  and
B. K. Sarkar
D. Basu
Affiliation:
Central Glass and Ceramic Research Institute, Jadavpur University, Calcutta 700032, India
B. K. Sarkar
Affiliation:
Central Glass and Ceramic Research Institute, Jadavpur University, Calcutta 700032, India
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Abstract

Short surface cracks were generated by Vickers indentation on the polished surface of alumina and different zirconia toughened alumina (ZTA) specimens, and their morphology was studied by serial sectioning. These cracks were grown in three-point bend tests under stepwise loading, and variation of toughness with crack extension was plotted to graphically separate the contributions from residual stress intensity and applied stress intensity factors. The plateau toughness determined from the intercept height of the crack extension plots exhibited an upward trend with zirconia content up to 15 vol % ZrO2 addition in the composition, which was proportional to the fraction of transformable tetragonal grains contributing to transformation toughening.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 12 , December 1996 , pp. 3057 - 3063
Copyright
Copyright © Materials Research Society 1996

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