Microstructural characterization of a zirconia-toughened alumina fiber reinforced niobium aluminide composite

Said Nourbakhsh, O. Sahin, W. H. Rhee, H. Margolin

Research output: Contribution to journalArticle

Abstract

An NbAl3 + Nb2Al composite reinforced with continuous zirconia-toughened alumina, PRD-166 fibers, was produced by pressure casting and was examined by optical and transmission electron microscopy and energy dispersive spectroscopy. Exposure of the fiber to the molten metal resulted in ZrO2 and Al2O3 grain growth, formation of a thin layer of an amorphous phase on the grain boundaries of Al2O3 and transformation of ZrO2. Preferential Al2O3 grain growth near the surface of the fiber led to the rejection of ZrO2 from this region into the molten metal. In NbAl3 slip occurred by the glide of a<110] superdislocations and tolesser extent by the glide of a pair of <111 + <311] dislocations on the (112) planes and a/2<110] superpartial dislocations on the (001) plane. The operating slip system in Nb2Al was identified as {010)<100]. a<100] dislocations were dissocaited into ax<100] partial dislocations joined together by a stacking fault.

Original languageEnglish (US)
Pages (from-to)285-294
Number of pages10
JournalActa Metallurgica et Materialia
Volume40
Issue number2
DOIs
StatePublished - 1992

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Niobium
Aluminum Oxide
Zirconia
Alumina
Grain growth
Liquid metals
Fibers
Composite materials
Stacking faults
Dislocations (crystals)
Energy dispersive spectroscopy
Casting
Grain boundaries
Transmission electron microscopy
zirconium oxide

ASJC Scopus subject areas

  • Engineering(all)

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Microstructural characterization of a zirconia-toughened alumina fiber reinforced niobium aluminide composite. / Nourbakhsh, Said; Sahin, O.; Rhee, W. H.; Margolin, H.

In: Acta Metallurgica et Materialia, Vol. 40, No. 2, 1992, p. 285-294.

Research output: Contribution to journalArticle

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