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Crystallography of Alumina-YAG-EutecticMultiple descriptions of the alumina-YAG eutectic crystallography appear in the ceramic literature. The orientation between two phases in a eutectic system has direct impact on residual stress, morphology, microstructural stability, and high temperature mechanical properties. A study to demonstrate that the different crystallographic relationships can be correlated with different growth constraints was undertaken. Fibers produced by Laser-Heated Float Zone (LHFZ) and Edge-defined Film-fed Growth (EFG) were examined. A map of the orientation relationship between Al2O3 and Y3Al5O12 and their relationship to the fiber growth axis as a function of pull rate are presented. Regions in which a single orientation predominates are identified.
Document ID
20000060817
Acquisition Source
Glenn Research Center
Document Type
Preprint (Draft being sent to journal)
Authors
Farmer, Serene C.
(NASA Glenn Research Center Cleveland, OH United States)
Sayir, Ali
(NASA Glenn Research Center Cleveland, OH United States)
Dickerson, Robert M.
(Los Alamos National Lab. NM United States)
Matson, Lawrence E.
(Wright Lab. Wright-Patterson AFB, OH United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 2000
Subject Category
Nonmetallic Materials
Meeting Information
Meeting: Engineering Ceramics and Structures
Location: Cocoa Beach, FL
Country: United States
Start Date: January 23, 2000
End Date: January 28, 2000
Sponsors: American Ceramic Society
Funding Number(s)
PROJECT: RTOP 523-31-13
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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