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Microsample Testing of Single Crystalline Ti-52 at%Al and Ti-55.5 at%Al

Published online by Cambridge University Press:  10 February 2011

Marc Zupan ,
D. M. Dimiduk  and
K. J. Hemker
Marc Zupan
Affiliation:
Johns Hopkins University, Dept. of Mechanical Engineering, Baltimore, MD 21218, U.S.A.
D. M. Dimiduk
Affiliation:
Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright-Patterson AFB, OH 45433–7817, U.S.A.
K. J. Hemker
Affiliation:
Johns Hopkins University, Dept. of Mechanical Engineering, Baltimore, MD 21218, U.S.A.
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Abstract

Dislocation activity in two-phase commercial TiAl alloys occurs most readily in the γ-TiAl phase, and measurements of the CRSS of single crystalline γ-TiAl provides a solid foundation for understanding the mechanical performance of these alloys. Single crystals of γ-TiAl with greater than 54.5 at%Al have been grown using the optical float zone crystal growing technique, but single crystals with lower Al content, closer to that of commercial alloys, have not. In the present study, polycrystalline ingots of Ti-52 at%Al have been heat treated to form very large grains, and microsample tensile specimens, which have a nominal gage cross-section of 250μm × 300μm, a gage length of 250μm and an overall length of 3 mm, have been machined from within single grains. Microsample high-temperature stress-strain curves for Ti-55.5 at%Al single crystals oriented along the [001] and [010] are presented. Tensile tests results for Ti-52 at%Al tested at 1073K along the [237], [173] and [344] orientations will also be discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 552: Symposium KK – High-Temperature Ordered Intermetallic Alloys VIII , 1998 , KK8.15.1
Copyright
Copyright © Materials Research Society 1999

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