A structural study of oxidation in an Al{sub 2}O{sub 3} fiber reinforced titanium aluminide composite

Journal Article · Tue Aug 01 04:00:00 EDT 1995 · Acta Metallurgica et Materialia

DOI:https://doi.org/10.1016/0956-7151(95)00020-V· OSTI ID:100601

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

---

1. Polytechnic Univ., Brooklyn, NY (United States). Dept. of Materials Science and Engineering

A composite of titanium aluminide, reinforced with ZrO{sub 2} toughened Al{sub 2}O{sub 3} fibers, has been produced by pressure casting. The stability of the microstructure during vacuum and air annealing was investigated by scanning and transmission electron microscopy (TEM). Processing resulted in partial dissolution of ZrO{sub 2} of the fiber into the molten metal which solidified into a two phase lamellar {alpha}{sub 2} + {gamma} matrix. Vacuum annealing caused dissolution of Al{sub 2}O{sub 3} fiber into the matrix, transformation of the matrix into {gamma} and precipitation of ZrO{sub 2} and Al{sub 2}Zr within {gamma}. During air annealing diffusion of O through the fiber resulted in the formation of Al{sub 2}O{sub 3} coated ZrO{sub 2} nodules extending from the fiber surface into the matrix in some regions and in the other regions the growth of Al{sub 2}O{sub 3} into the {gamma} of the lamellar matrix. An A15 phase with the metal composition, Ti{sub 3}Al{sub 2}, was found between the external oxide scale and the metal matrix.

• OSTI ID: 100601
• Journal Information: Acta Metallurgica et Materialia, Journal Name: Acta Metallurgica et Materialia Journal Issue: 8 Vol. 43; ISSN 0956-7151; ISSN AMATEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AIR
ALUMINIUM ALLOYS
ALUMINIUM OXIDES
ANNEALING
COMPOSITE MATERIALS
DISSOLUTION
HIGH VACUUM
INTERMETALLIC COMPOUNDS
LIQUID METALS
MICROSTRUCTURE
OXIDATION
PRECIPITATION
SAMPLE PREPARATION
SCANNING ELECTRON MICROSCOPY
TITANIUM ALLOYS
TRANSMISSION ELECTRON MICROSCOPY
ZIRCONIUM OXIDES