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

Conference · Sat Dec 30 23:00:00 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
• Country of Publication: United States
• Language: English

Related Subjects

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