Intermetallic Alloys Based on Orthorhombic Titanium Aluminide

Advanced Engineering MaterialsVolume 3, Issue 11 p. 851-864 Review Intermetallic Alloys Based on Orthorhombic Titanium Aluminide J. Kumpfert, J. Kumpfert joerg.kumpfert@dlr.de Search for more papers by this author J. Kumpfert, J. Kumpfert joerg.kumpfert@dlr.de Search for more papers by this author First published: 21 November 2001 https://doi.org/10.1002/1527-2648(200111)3:11<851::AID-ADEM851>3.0.CO;2-GCitations: 145AboutRelatedInformationPDFPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessClose modalShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Abstract Orthorhombic titanium aluminides represent the youngest class of alloys emerging out of the group of titanium aluminides. These new materials are based on the ordered orthorhombic phase Ti2AlNb, which was discovered for the first time in the late 1980s as a constituent in a Ti3Al-base alloy. In the 1990s primarily simple ternary Ti–Al–Nb orthorhombic alloys were investigated in countries such as the US, UK, India, France, Japan, and Germany. The drive was mainly provided by jet engine manufacturers and related research labs looking for a damage-tolerant, high-temperature, light-weight material. This follows the aim of further extending the use of lower density titanium-base materials in temperature regimes, where heavy nickel-base superalloys are the only alternative today. The present understanding of microstructure–property relationships for orthorhombic titanium aluminides reveals an attractive combination of low and high temperature loading capabilities. These involve high room-temperature ductility and good formability, high specific elevated temperature tensile and fatigue strength, reasonable room-temperature fracture toughness and crack growth behavior, good creep, oxidation, and ignition resistance combined with a low thermal expansion coefficient. This article reviews the aspects of composition–microstructure–property relationships in comparison to near-α titanium, TiAl, and nickel-base alloys. Special emphasis is also placed on the environmental degradation of the mechanical properties. Citing Literature Volume3, Issue11November, 2001Pages 851-864 RelatedInformation Recommendedγ‐Titanium Aluminide Alloys: Alloy Design and PropertiesF. Appel, M. Oehring, Titanium and Titanium Alloys: Fundamentals and Applications, [1]Structure and Properties of Titanium and Titanium AlloysM. Peters, J. Hemptenmacher, J. Kumpfert, C. Leyens, Titanium and Titanium Alloys: Fundamentals and Applications, [1]Gas Atomized γ‐Titanium Aluminide AlloysUlrike Habel, C. Frederick Yolton, Brian J. McTiernan, Intermetallics and Superalloys, [1]Recent Progress in the Development of Gamma Titanium Aluminide AlloysF. Appel, U. Brossmann, U. Christoph, S. Eggert, P. Janschek, U. Lorenz, J. Müllauer, M. Oehring, J. D. H. Paul, Advanced Engineering MaterialsProcessing and Applications of Intermetallic γ‐TiAl‐Based AlloysH. Clemens, H. Kestler, Advanced Engineering Materials