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High-temperature deformation behavior of the intermetallic Ti-47 At. Pct Al-3 At. Pct Cr alloy

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Abstract

A study of the high-temperature deformation behavior of a binary α 2+γTi-47 at. pct Al-3 at. pct Cr alloy was undertaken. The alloy was produced by induction melting and exhibited a structure of coarse columnar grains oriented in the radial direction. After a solution treatment at 1653 K for 3600 seconds and aging at 1223 K for 28,800 seconds, a nearly lamellar structure was formed. Deformation behavior was investigated by compression-strain-rate-change tests at strain rates ranging from 10−6 to 10−3 s−1 and temperatures ranging from 1073 to 1373 K. This alloy shows at low temperature/high stress a stress exponent of about 5. The deformation behavior is explained in this regimen by a dislocation climb mechanism, which includes a threshold stress. Finally, at the lowest stress levels and highest temperatures of testing, a stress exponent of about 3 is observed, which suggests that deformation is controlled by the viscous glide of dislocations.

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Authors and Affiliations

  1. the Department of Materials Engineering, Max Planck Institut fur Eisenforschung, 40237, Dusseldorf, Germany

    J. A. Jimenez (Staff Scientist), J. Wesemann (Staff Scientist) & G. Frommeyer (Professor)

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  1. J. A. Jimenez
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  2. J. Wesemann
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  3. G. Frommeyer
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Jimenez, J.A., Wesemann, J. & Frommeyer, G. High-temperature deformation behavior of the intermetallic Ti-47 At. Pct Al-3 At. Pct Cr alloy. Metall Mater Trans A 29, 1425–1430 (1998). https://doi.org/10.1007/s11661-998-0357-x

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  • DOI: https://doi.org/10.1007/s11661-998-0357-x

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