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Superplastic behavior of two-phase titanium aluminides

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Abstract

A two-phase Ti(57 at. pct)-Al(43 at. pct) alloy with an initial lamellar microstructure was thermomechanically processed to form an equiaxed fine-grained structure. The fine-grained (- L = 5 μm) material was superplastic in the temperature range 1000 °C to 1100 °C, exhibiting a stress exponent of about 2 with a tensile ductility of 275 pct. The rate-controlling deformation mechanism is proposed to be grain boundary sliding accommodated by slip controlled by lattice diffusion in TiAl. At room temperature, the lamellar and fine-grained materials exhibit the same compressive yield stress. The compressive strain to failure, however, for the fine-grained material was about 28 pct compared to 6 pct for the lamellar material.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Stanford University, 94305, Stanford, CA

    S. C. Cheng (Graduate Student) & J. Wolfenstine (Professor)

  2. Department of Mechanical and Aerospace Engineering, University of California, 92717, Irvine, CA

    O. D. Sherby (Assistant Professor)

Authors
  1. S. C. Cheng
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  2. J. Wolfenstine
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  3. O. D. Sherby
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Cheng, S.C., Wolfenstine, J. & Sherby, O.D. Superplastic behavior of two-phase titanium aluminides. Metall Trans A 23, 1509–1513 (1992). https://doi.org/10.1007/BF02647333

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  • DOI: https://doi.org/10.1007/BF02647333

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