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Texture and Microstructure Development in Al2O3-Platelet Reinforced Ce-ZrO2/
Author(s) -
Ryan K. Roeder,
Keith J. Bowman,
Kevin P. Trumble
Publication year - 1995
Publication title -
texture stress and microstructure
Language(s) - English
Resource type - Journals
eISSN - 1687-5400
pISSN - 1687-5397
DOI - 10.1155/tsm.24.43
Subject(s) - texture (cosmology) , computer science , materials science , artificial intelligence , image (mathematics)
A dispersed, low-solids-fraction suspension containingCe-ZrO 2 , fineAl 2 O 3and 5 vol%Al 2 O 3 -plateletswas segregated using centrifugal consolidation to produce functionally gradient laminates (FGLs).Platelet alignment facilitated efficient packing of highly anisometric platelets to high densities. Thecomplexity and anisotropy of the microstructure warrants a quantitative analysis of the microstructuralevolution prior to any property evaluation. Quantitative image analysis was used to examine changesin the volume fraction, dimensional anisotropy, and gradient of pores and platelets with sintering time.In all cases, special attention was given to the effects of texture during microstructural evolution. Plateletalignment enhanced densification via anisotropic shrinkage, overcoming constraint that otherwise inhibitsdensification in platelet-containing materials. Also, platelet alignment and microstructural design wereused to initiate and control anisotropic grain growth. Platelet growth (at the expense of smaller particlesof the same phase) during annealing promoted further phase segregation and produced higher plateletcontent composites consisting of larger platelets, without having to consolidate high contents of largeplatelets.

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