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Strain‐Rate‐Dependent Transformation Behavior of a 9 mol% Ce‐TZP Ceramic
Author(s) -
Liu Tianshun,
Mai YiuWing
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.tb04459.x
Subject(s) - crosshead , materials science , charpy impact test , ceramic , composite material , strain rate , grain size , stress (linguistics) , transformation (genetics) , strain (injury) , mineralogy , flexural strength , ultimate tensile strength , geology , chemistry , medicine , linguistics , philosophy , biochemistry , gene
The strain rate dependence of the stress‐induced t–m transformation behavior of a Ce‐TZP ceramic with a grain size of 1.1 μm has been investigated both in four‐point bend and Charpy impact tests. The crosshead speed was varied from 8.3 × 10 −8 m/s to 8.3 × 10 −3 m/s in the four‐point bend tests. In the impact tests, the striking velocity was 2.5 m/s. Double notches ( a/w = 0.5) were made on one side of the specimen to measure the stress‐induced t–m transformation zone size at the nonpropagated notch tip. It was found that a transition of the transformation zone size with crosshead speed occurred at about 10 −6 to 10 −5 m/s. Above this critical speed, the transformation zone was at least an order of magnitude larger in size. This new strain‐rate‐dependent transformation behavior has not been previously reported.