Interfacial shear strength of cast and directionally solidified NiAl-sapphire fiber composites

Journal Article · Wed Sep 01 04:00:00 EDT 1993 · Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)

DOI:https://doi.org/10.1007/BF02666345· OSTI ID:6238251

Tewari, S N; Asthana, R ^[1]; Noebe, R D ^[2]

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1. Cleveland State Univ., OH (United States). Chemical Engineering Dept.
2. NASA Lewis Research Center, Cleveland, OH (United States). Intermetallics Branch

The feasibility of fabricating intermetallic NiAl-sapphire fiber composites by casting and zone directional solidification has been examined. The fiber-matrix interfacial shear strengths measured using a fiber push-out technique in both cast and directionally solidified composites are greater than the strengths reported for composites fabricated by powder cloth process using organic binders. Microscopic examination of fibers extracted from cast, directionally solidified (DS), and thermally cycled composites, and the high values of interfacial shear strengths suggest that the fiber-matrix interface does not degrade due to casting and directional solidification. Sapphire fibers do not pin grain boundaries during directional solidification, suggesting that this technique can be used to fabricate sapphire fiber reinforced NiAl composites with single crystal matrices.

• OSTI ID: 6238251
• Journal Information: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States), Journal Name: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States) Vol. 24:9; ISSN 0360-2133; ISSN MTTABN
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360601* -- Other Materials-- Preparation & Manufacture
360603 -- Materials-- Properties
ALLOYS
ALUMINIUM ALLOYS
CASTING
COMPOSITE MATERIALS
CORUNDUM
FABRICATION
FIBERS
INTERFACES
INTERMETALLIC COMPOUNDS
MATERIALS
MECHANICAL PROPERTIES
MINERALS
NICKEL ALLOYS
OXIDE MINERALS
PHASE TRANSFORMATIONS
SAPPHIRE
SHEAR PROPERTIES
SOLIDIFICATION
THERMAL CYCLING