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Effects of Processing on the Mechanical Properties and Oxidation behavior of Al2Ti

Published online by Cambridge University Press:  22 February 2011

John C. Ma ,
John E. Benci  and
Thomas P. Feist
John C. Ma
Affiliation:
Department of Materials Science and Engineering, Wayne State University, Detroit, MI 48202.
John E. Benci
Affiliation:
Department of Materials Science and Engineering, Wayne State University, Detroit, MI 48202.
Thomas P. Feist
Affiliation:
Central Research and Development, E.I. DuPont de Nemours & Company, Inc., Wilmington, DE 19880.
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Abstract

Al2Ti is a promising material for use in elevated temperature structural applications. It has a lower density than Ti3Al and TiAl. We have previously shown that the compressive yield strength of Al2Ti is higher than that of similarly processed TiAl and Al3Ti between room temperature and 900°C. In this study, two additional processing methods were utilized to produce the material: uniaxial hot pressing of rapidly solidified powder and hot forging of cast ingots. Effects of hot forging or annealing of as-cast Al2Ti on the microhardness and load for crack initiation were studied. The microhardness and crack initiation load were also used to compare powder processed material consolidated either by hot pressing or hot isostatic pressing. The oxidation behavior of as-cast, cast & hot isostatically pressed (cast & hip’ed), and powder processed & hip’ed (PP) Al2Ti was also investigated. The oxidation tests were performed in air at 815°C and 982°C for 100 hr. PP Al2Ti exhibited the lowest weight gain and as-cast exhibited the highest. Al2Ti shows superior oxidation resistance compared to Ti3Al- and TiAl- based alloys tested under similar conditions and shows comparable oxidation resistance to Al3Ti at 800°C. SEM/EDS was used to study the morphological development of the oxide scale and to identify the chemical constituents present in the various layers of the scale.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 364: Symposium L – High-Temperature Ordered Intermetallic Alloys–VI , 1994 , 1303
Copyright
Copyright © Materials Research Society 1995

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