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Subsurface Indentation Damage and Mechanical Characterization of α‐Sialon Ceramics
Author(s) -
Xie Z.H.,
Hoffman M.,
Moon R. J.,
Munroe P. R.,
Cheng Y.B.
Publication year - 2004
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.1151-2916.2004.tb06368.x
Subject(s) - indentation , microstructure , materials science , characterization (materials science) , composite material , ceramic , vickers hardness test , sialon , deformation (meteorology) , fracture (geology) , modulus , indentation hardness , focused ion beam , ion , physics , quantum mechanics , nanotechnology
Two hot‐pressed sintered α‐sialon samples of differing microstructures, but identical chemical composition, were evaluated first, in terms of indentation hardness and modulus, by depth‐sensing indentation (DSI) tests on planes parallel and normal to the hot‐pressed surface. The surface and subsurface cracks created under the DSI tests have also been investigated in relation to the effect of microstructure. Subsequently, Vickers indentation tests were conducted to explore the deformation and fracture characteristics in the two samples. The effect of microstructure and grain orientation on the development of different types of cracks, in particular subsurface cracks, was revealed and analyzed. Additionally, it suggested that the focused ion beam (FIB) miller is a preferred tool, in comparison to the conventional cross‐sectioning techniques, for examining subsurface crack formation and structural characteristics.