Fabrication of Al{sub 2}O{sub 3}-reinforced Ni{sub 3}Al composites by a novel in situ route

Journal Article · Tue Apr 01 04:00:00 EST 1997 · Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science

DOI:https://doi.org/10.1007/s11661-997-0236-x· OSTI ID:484853

Nourbakhsh, S; Sahin, O; Margolin, H ^[1]

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1. Polytechnic Univ., Brooklyn, NY (United States)

A novel in situ technique has been used to fabricate an Al{sub 2}O{sub 3}-reinforced Ni{sub 3}Al matrix composite. The composite was prepared by first incorporating a low volume fraction of continuous Al{sub 2}O{sub 3} fibers in a Ni{sub 3}Al alloy containing 0.34 at. pct Zr. Pressure casting was used to embed the fibers. Casting resulted in partial reduction of the Al{sub 2}O{sub 3} fiber by the Zr present in the matrix and the formation of a layer of ZrO{sub 2} on the surface of the fibers. The final composite was then prepared by air annealing the precursor composite at 1,100 C for 10 days. Air annealing led to the formation of networks of Al{sub 2}O{sub 3} around the fibers. The matrix in the immediate vicinity of the networks consisted of Ni{sub 3}Al particles in a matrix of disordered {alpha}-Ni(Al). The Al{sub 2}O{sub 3} networks raised the yield and tensile strength of the material by 35 and 18 pct, respectively. The composite had a tensile ductility of 14 pct.

• Sponsoring Organization: USDOE
• OSTI ID: 484853
• Journal Information: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Journal Issue: 4 Vol. 28; ISSN 1073-5623; ISSN MMTAEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AIR
ALUMINIUM ALLOYS
ALUMINIUM OXIDES
ANNEALING
CASTING
COMPOSITE MATERIALS
DIFFUSION
FABRICATION
FIBERS
MECHANICAL PROPERTIES
NICKEL ALLOYS
ZIRCONIUM ADDITIONS
ZIRCONIUM OXIDES