Refinement of the lamellar structure in TiAl-based intermetallic compound by addition of carbon

Journal Article · Fri Nov 05 04:00:00 EST 1999 · Scripta Materialia

DOI:https://doi.org/10.1016/S1359-6462(99)00266-3· OSTI ID:20001696

Park, H S; Nam, S W; Kim, N J; Hwang, S K

Intermetallic compounds based on TiAl are under extensive studies for structural materials in aerospace applications. Recently the effects of interstitial elements on the mechanical properties have been reported, which can be summarized as the enhancement of tensile strength and creep resistance. Appel reported that the creep resistance of TiAl alloy could be increased by carbon addition. Considering the important effect of carbon on the creep resistance of TiAl, it is important to gather more information on the basic role of carbon on the microstructure. In ingot alloys, there is an indication that the details of the fully lamellar structure were affected by carbon or nitrogen. This effect, however, has not been addressed in the intermetallic compound processed by powder metallurgical method. In this respect, the TiAl compound made by EPM (Elemental Powder Method) is of particular interest since this process is a potential alternative to ingot metallurgy for fabricating parts of complex shape. Recently the authors reported that a TiAl-Mn-Mo alloy could be successfully produced by EPM. In the present study, therefore, it was intended to study the effect of carbon on the phase transformation of this alloy of a FL (Fully Lamellar) microstructure.

• Research Organization: Inha Univ., Incheon (KR)
• OSTI ID: 20001696
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 11 Vol. 41; ISSN SCMAF7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CARBON ADDITIONS
CRYSTAL-PHASE TRANSFORMATIONS
INTERMETALLIC COMPOUNDS
LAMELLAE
METALLURGICAL EFFECTS
MICROSTRUCTURE
TITANIUM ALLOYS