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Effects of Microstructure on the Deformation Mechanisms in Silicon Nitride
Author(s) -
Schneider Judith A.,
Mukherjee Amiya K.
Publication year - 1999
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.1151-2916.1999.tb01830.x
Subject(s) - microstructure , materials science , silicon nitride , deformation (meteorology) , phase (matter) , flow stress , strain rate , stress (linguistics) , composite material , compression (physics) , silicon , strain (injury) , metallurgy , chemistry , medicine , linguistics , philosophy , organic chemistry
Changes in phase composition and morphology were investigated in silicon nitride (Si 3 N 4 ) both before and after compressive deformation testing. Different additive systems were used to prepare Si 3 N 4 specimens, resulting in either an initial alpha‐phase or β‐phase microstructure. Constant‐strain‐rate compression tests were used to evaluate the differences in the strain‐rate dependency of the flow stress for the two phases. A flow‐stress dependency of n = 1 was observed in the β‐phase specimens, compared to an n value that approached 2 in the alpha‐phase specimens.