Fabrication of Al2O3-reinforced Ni3Al composites by a novel in situ route

Said Nourbakhsh, O. Sahin, H. Margolin

Research output: Contribution to journalArticle

Abstract

A novel in situ technique has been used to fabricate an Al2O3-reinforced Ni3Al matrix composite. The composite was prepared by first incorporating a low volume fraction of continuous Al2O3 fibers in a Ni3Al alloy containing 0.34 at. pet Zr. Pressure casting was used to embed the fibers. Casting resulted in partial reduction of the Al2O3 fiber by the Zr present in the matrix and the formation of a layer of ZrO2 on the surface of the fibers. The final composite was then prepared by air annealing the precursor composite at 1100 °C for 10 days. Air annealing led to the formation of networks of Al2O3 around the fibers. The matrix in the immediate vicinity of the networks consisted of Ni3Al particles in a matrix of disordered α-Ni(Al). The A12O3 networks raised the yield and tensile strength of the material by 35 and 18 pet, respectively. The composite had a tensile ductility of 14 pet.

Original languageEnglish (US)
Pages (from-to)1069-1077
Number of pages9
JournalMetallurgical and Materials Transactions A
Volume28
Issue number4
StatePublished - 1997

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Fabrication
Fibers
Composite materials
Casting
Annealing
Air
Yield stress
Ductility
Volume fraction
Tensile strength

ASJC Scopus subject areas

  • Materials Science(all)
  • Metals and Alloys

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Fabrication of Al2O3-reinforced Ni3Al composites by a novel in situ route. / Nourbakhsh, Said; Sahin, O.; Margolin, H.

In: Metallurgical and Materials Transactions A, Vol. 28, No. 4, 1997, p. 1069-1077.

Research output: Contribution to journalArticle

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