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Strengthening and Toughening of Silicon Nitride by Superplastic Deformation
Author(s) -
Kondo Naoki,
Ohji Tatsuki,
Wakai Fumihiro
Publication year - 1998
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.1151-2916.1998.tb02395.x
Subject(s) - superplasticity , materials science , silicon nitride , fracture toughness , microstructure , composite material , deformation (meteorology) , metallurgy , bending , flexural strength , toughness , toughening , silicon
Mechanical properties of silicon nitride which was superplastically deformed in plane‐strain compression were investigated. Superplastically deformed silicon nitride exhibited a highly anisotropic microstructure, where rod‐shaped grains tended to be aligned along the extruding direction. The bending strength and fracture toughness were increased substantially by the deformation process when a stress was applied in the extruding direction. It appears that these improvements were mainly due to effective operation of grain bridging and pull‐out by the grain alignment.