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Tensile Behavior of Al2o3/feal + B and Al2o3/fecraly CompositesThe feasibility of Al2O3/FeAl + B and Al2O3/FeCrAlY composites for high-temperature applications was assessed. The major emphasis was on tensile behavior of both the monolithics and composites from 298 to 1100 K. However, the study also included determining the chemical compatibility of the composites, measuring the interfacial shear strengths, and investigating the effect of processing on the strength of the single-crystal Al2O3 fibers. The interfacial shear strengths were low for Al203/FeAl + B and moderate to high for Al203/FeCrAlY. The difference in interfacial bond strengths between the two systems affected the tensile behavior of the composites. The strength of the Al203 fiber was significantly degraded after composite processing for both composite systems and resulted in poor composite tensile properties. The ultimate tensile strength (UTS) values of the composites could generally be predicted with either rule of mixtures (ROM) calculations or existing models when using the strength of the etched-out fiber. The Al2O3/FeAl + B composite system was determined to be unfeasible due to poor interfacial shear strengths and a large mismatch in coefficient of thermal expansion (CTE). Development of the Al2O3/FeCrAlY system would require an effective diffusion barrier to minimize the fiber strength degradation during processing and elevated temperature service.
Document ID
Document Type
Reprint (Version printed in journal)
Draper, S. L.
(NASA Lewis Research Center Cleveland, OH United States)
Eldridge, J. I.
(NASA Lewis Research Center Cleveland, OH United States)
Aiken, B. J. M.
(Case Western Reserve Univ. Cleveland, OH United States)
Date Acquired
September 6, 2013
Publication Date
October 1, 1995
Publication Information
Publication: Metallurgical and Materials Transactions A
Volume: 26A
Subject Category
Composite Materials
Report/Patent Number
NAS 1.15:112491
Accession Number
Distribution Limits
Work of the US Gov. Public Use Permitted.
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