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

Journal Article · Wed Dec 01 04:00:00 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), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 29:11; ISSN 0956-716X; ISSN SCRMEX
• Country of Publication: United States
• Language: English

Related Subjects

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