Effect of processing on oxygen content and phase relations in lightweight titanium aluminides

Conference · Sun Dec 31 00:00:00 EST 1995

OSTI ID:186741

Kumar, S G; Reddy, R G ^[1]

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1. Univ. of Nevada, Reno, NV (United States)

The interstitial elements like oxygen, nitrogen, carbon and hydrogen are known to play a vital role in the performance of conventional titanium alloys and also the intermetallic titanium aluminides. The presence of oxygen significantly alters the phase relations in these alloys. A series of titanium aluminides are processed by powder metallurgy route from elemental powders and pre-alloyed powders, and sintered for extended hours. The phases present are identified by X-ray diffraction, optical microscope, Scanning Electron Microscope with Energy Dispersive Spectrometer (SEM-EDS) and Electron Microprobe Analyzer (EPMA). Quantitative analysis is carried out by EPMA. A large scatter in the oxygen content is observed and its solubility is low in TiAl{sub 3} compared to TiAl or Ti{sub 3}Al. The effect of processing on the microstructure and phase relations in a 22Ti-66Al-12Nb alloy is discussed.

• OSTI ID: 186741
• Report Number(s): CONF-950201-; ISBN 0-87339-316-3; TRN: 96:007149
• Resource Relation: Conference: Annual meeting and exhibition of the Minerals, Metals and Materials Society (TMS), Las Vegas, NV (United States), 12-16 Feb 1995; Other Information: PBD: 1995; Related Information: Is Part Of Synthesis/processing of lightweight metallic materials. Proceedings; Froes, F.H.; Suryanarayana, C. [eds.] [Univ. of Idaho, Moscow, ID (United States). Inst. for Materials and Advanced Processes]; Ward-Close, C.M. [ed.] [Defence Research Agency, Farnborough (United Kingdom)]; PB: 380 p.
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
TITANIUM ALLOYS
FABRICATION
MICROSTRUCTURE
PHASE STUDIES
ALUMINIUM ALLOYS
NIOBIUM ALLOYS
INTERMETALLIC COMPOUNDS
POWDER METALLURGY
COLD PRESSING
HOT PRESSING
MELTING
SINTERING
X-RAY DIFFRACTION
OPTICAL MICROSCOPY
SCANNING ELECTRON MICROSCOPY
ELECTRON MICROPROBE ANALYSIS
OXIDATION
POROSITY