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Dynamic Stress‐Induced Transformation and Texture Formation in Uniaxial Compression of Zirconia Ceramics
Author(s) -
Subhash Ghatuparthi,
NematNasser Sia
Publication year - 1993
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.1151-2916.1993.tb03701.x
Subject(s) - materials science , composite material , ceramic , texture (cosmology) , saturation (graph theory) , diffraction , stress (linguistics) , compression (physics) , cubic zirconia , plasticity , residual stress , optics , linguistics , philosophy , image (mathematics) , mathematics , physics , combinatorics , artificial intelligence , computer science
Transformation plasticity in Mg‐PSZ and Y‐TZP ceramics is investigated using a novel stress reversal Hopkinson bar technique recently developed at the University of California–San Diego (UCSD) for dynamic recovery experiments. 1 The longitudinal and transverse strains are measured by strain gauges mounted on the specimen. The specimens are loaded until transformation reaches saturation. Reloading of the same specimens to higher stress levels does not reveal additional inelasticity. Cuboid specimens which have been loaded initially to attain transformation saturation are then reloaded in a direction perpendicular to the first loading. The second loading produces additional inelasticity and microcracking, indicating the formation of transformation texture in each loading under uniaxial compression. Microscopic observations, and the results of ultrasonic and X‐ray diffraction measurements, as well as micromechanical modeling of the damage evolution are discussed.