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Experimental Study of Stress‐Induced Localized Transformation Plastic Zones in Tetragonal Zirconia Polycrystalline Ceramics
Author(s) -
Sun Qingping,
Zhao Zhijun,
Chen Weizhe,
Qing Xinglin,
Xu Xiaojian,
Dai Fuloon
Publication year - 1994
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.1151-2916.1994.tb05414.x
Subject(s) - materials science , composite material , crystallite , plasticity , ceramic , deformation (meteorology) , diffusionless transformation , stress (linguistics) , mineralogy , martensite , metallurgy , microstructure , geology , linguistics , philosophy
Stress‐induced martensitic transformation plastic zones in ceria‐stabilized tetragonal zirconia polycrystalline ceramics (Ce‐TZP), under loading conditions of uniaxial tension, compression, and three‐point bending, are studied by experiments. The transformed monoclinic phase volume fraction distribution and the corresponding plastic strain distribution and the surface morphology (surface uplift) are measured by means of moire interferometry, Raman microprobe spectroscopy, and the surface measurement system. The experimental results from the above three kinds of specimens and methods consistently show that the stress‐induced transformation at room temperature of the above specimen is not uniform within the transformation zone and that the plastic deformation is concentrated in some narrow band; i.e., macroscopic plastic flow localization proceeds during the initial stage of plastic deformation. Flow localization phenomena are all observed in uniaxial tension, compression, and three‐point bending specimens. Some implications of the flow localization to the constitutive modeling and toughening of transforming thermoelastic polycrystalline ceramics are explored.