Solid-state hot pressing of elemental aluminum and titanium powders to form TiAl ({gamma} + {alpha}{sub 2}) intermetallic microstructure

Journal Article · Tue Oct 01 04:00:00 EDT 1996 · Journal of Materials Engineering and Performance

DOI:https://doi.org/10.1007/BF02646085· OSTI ID:415448

Yang, J B; Teoh, K W; Hwang, W S ^[1]

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1. National Cheng Kung Univ., Tainan (Taiwan, Province of China). Dept. of Materials Science and Engineering

The elemental powder metallurgy (EPM) process is used to prepare TiAl-base intermetallics. An EPM process conducted by two-stage solid-state hot pressing was employed to prepare TiAl-base intermetallics and to investigate the resulting microstructural changes. The results showed that the TiAl{sub 3} phase forms in the first stage. During the temperature increase to the second sintering stage, lamellar phases start to precipitate in the TiAl{sub 3} matrix. Further, the TiAl{sub 3} phase transforms to TiAl, and Ti{sub 3}Al layers develop in the remaining titanium particles. Meanwhile, the lamellar phases grow into ring-type structures between the TiAl matrix and the Ti{sub 3}Al layers. After the second stage, the remaining titanium particles are fully reacted, and a microstructure of Ti{sub 3}Al phases enclosed by fine-grained lamellar rings in the TiAl matrix is developed.

• Sponsoring Organization: USDOE
• OSTI ID: 415448
• Journal Information: Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 5 Vol. 5; ISSN 1059-9495; ISSN JMEPEG
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
36 MATERIALS SCIENCE
AEROSPACE INDUSTRY
ALUMINIUM ALLOYS
COMPACTING
CRYSTAL-PHASE TRANSFORMATIONS
DIFFUSION
HOT PRESSING
INTERMETALLIC COMPOUNDS
KIRKENDALL EFFECT
LAMELLAE
MATERIALS
MICROSTRUCTURE
POWDER METALLURGY
PRECIPITATION
SINTERING
TITANIUM ALLOYS