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Deformation Twinning in Single‐Crystal Monoclinic Zirconia: A First Report
Author(s) -
First Richard C.,
Heuer Arthur H.
Publication year - 1992
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1992.tb04502.x
Subject(s) - knoop hardness test , crystal twinning , monoclinic crystal system , materials science , cubic zirconia , deformation (meteorology) , single crystal , vickers hardness test , crystallography , anisotropy , composite material , mineralogy , indentation hardness , crystal structure , optics , microstructure , ceramic , chemistry , physics
The hardness of single crystals of flux‐grown, untwinned monoclinic zirconia was determined using Knoop and Vickers microindenters. Significant hardness anisotropy existed on (100) and {110} faces, with a maximum Knoop hardness of ∼8 GPa, although large variance was observed between different batches of crystals. Extensive deformation twinning, primarily on {110}, but also on (001), accompanied microindentation at all temperatures between room temperature and 800°C.