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Deformation kinetics of commercial Ti-50A (0.5 At. Pct Oeq) at low temperatures (T<0.3T m )

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Abstract

The effects of strain rate and temperature on the flow stress of commercial Ti-50A titanium (0.5 at. pct Oeq) wire of 2 and 22 µm grain size were investigated over the range of 4.2 to 700 K. Employing the thermally activated plastic flow concept, it was concluded that the rate-controlling mechanism in Ti-50A at low temperatures (T<≈600 K) is the thermally activated overcoming of interstitial solute atom obstacles (mainly oxygen) by dislocations moving on the first-order prism planes. The Gibbs free energy of activation for the process is ≈1.5 ev(≈0.2 µb3), the maximum force of interaction ≈8 X 10-5 dynes (≈0.2 smb2), and the activation distance at which the force first rises rapidly ≈ lb. The derived deformation kinetics parameters are in reasonable accord with the Fleischer-Friedel model of solid solution strengthening, the interaction energy being given by the combined effect of the tetragonal distortion and the modulus mismatch produced by the interstitials. Qualitative accord is also obtained for the breaking of chemical bonds between the interstitial solutes and the surrounding titanium atoms by the passage of dislocations.

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Authors and Affiliations

  1. Building 14-120B, Metallurgical Laboratory, General Electric Corporation, 2901 East Lake Road, 16531, Erie, PA

    Chih-An Yin

  2. Detroit Diesel Allison Division, General Motors Corporation, 46206, Indianapolis, IN

    M. Döner

  3. Materials Engineering Department, North Carolina State University, P. O. Box 5427, 27650, Raleigh, NC

    H. Conrad (Head)

Authors
  1. Chih-An Yin
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  2. M. Döner
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  3. H. Conrad
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Yin, CA., Döner, M. & Conrad, H. Deformation kinetics of commercial Ti-50A (0.5 At. Pct Oeq) at low temperatures (T<0.3T m ). Metall Trans A 14, 2545–2556 (1983). https://doi.org/10.1007/BF02668896

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  • DOI: https://doi.org/10.1007/BF02668896

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