Indentation stress-strain curves for "quasi-ductile" ceramics

Published on Jan 1, 1996in Acta Metallurgica
Ac Fischer-Cripps1
Estimated H-index: 1
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A stress analysis is made of Hertzian contact deformation in relatively tough ceramics with heterogeneous microstructures, where the response is essentially quasi-plastic rather than ideally elastic-brittle. Contact data for two such heterogeneous ceramics, a micaceous glass-ceramic with modest hardness and a silicon nitride with high hardness, are presented as illustrative cases. Data from a soft steel serve as a comparative baseline. Two distinctive aspects of the deformation response are expl...
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In this Part I of a two-part study of Hertzian indentation in silicon nitride we characterize irreversible contact damage as a function of microstructure. Three controlled silicon nitride microstructures are examined, representing a progression toward greater long-crack toughness: fine (F), bimodal with predominantly equiaxed α grains; medium (M), bimodal with mostly β grains of intermediate size; and coarse (C), with almost exclusively elongated β grains. An effect of increasing the microstruct...
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