Superplastic behavior in a two-phase TiAl alloy. [Ti-47. 3Al-1. 9Nb-1. 6Cr-0. 5Si-0. 4Mn]

Journal Article · Wed Dec 01 00:00:00 EST 1993 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(93)90327-O· OSTI ID:5791033

Lee, W B; Yang, H S; Mukherjee, A K ^[1]; Kim, Y W ^[2]

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1. Univ. of California, Davis, CA (United States). Dept of Mechanical, Aeronautical and Materials Engineering
2. Univ. of California, Davis, CA (United States). Materials Research Div.

Gamma alloys based on TiAl exhibit high strength to density ratio, better oxidation resistance than Ti[sub 3]Al alloys, and good creep properties at elevated temperatures. Recent studies have shown that the room temperature ductility of gamma titanium aluminide alloys can be improved up to 3--4% by alloy modification and thermomechanical processing. These technological achievements further broaden the range of structural application of these alloys. Significant advances have also been made recently to improve the high temperature ductility in ordered intermetallics by optimizing the microstructure suitable for structural superplasticity through careful thermomechanical processing. The superplastic behavior of titanium aluminides based on Ti[sub 3]Al and other ordered intermetallics have been demonstrated but only few studies have been done to show superplasticity in [gamma][minus]TiAl. Full characterization of superplasticity in TiAl based alloy is still lacking. In this investigation, the superplastic deformation of a [gamma][minus]TiAl with duplex microstructure, equiaxed [gamma] and lamellar [alpha][sub 2] + [gamma], was studied with respect to the effect of testing temperature and strain rate. Microstructural evolution during deformation was examined and correlated to the mechanical properties.

• OSTI ID: 5791033
• Journal Information: Scripta Metallurgica et Materialia; (United States), Vol. 29:11; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
MICROSTRUCTURE
PLASTICITY
CHROMIUM ALLOYS
NIOBIUM ALLOYS
TITANIUM BASE ALLOYS
CREEP
MANGANESE ADDITIONS
PHASE STUDIES
SILICON ADDITIONS
ALLOYS
MANGANESE ALLOYS
MECHANICAL PROPERTIES
SILICON ALLOYS
TITANIUM ALLOYS
360103* - Metals & Alloys- Mechanical Properties
360102 - Metals & Alloys- Structure & Phase Studies