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Deformation kinetics of α-titanium at low temperatures using stress relaxation

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Abstract

Stress relaxation tests were carried out on titanium wire (0.2 at. pct Oeq) as a function of grain size (5 to 42 μm) at 77 to 623 K to study the rate-controlling mechanism. Values for the activation volume were derived from the slope of the stress relaxation curves. The Gibbs free energy of activation ΔG at σ* = 0 and OK was ∼1.4 eV (∼0.2 μo2b2), the maximum forcef*i of the dislocation-obstacle interaction ∼80 x 10-6 dyne (~0.2 μ0b2) and the activation distancex* at which the force first increases rapidly ∼2b. These values are in good agreement with those obtained in the more conventional strain rate cycling tests and support the earlier conclusion that the rate controlling mechanism during the low temperature deformation of titanium is thermally activated overcoming of interstitial solute obstacles on the first order prism planes.

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Authors and Affiliations

  1. Department of Metallurgical Engineering and Materials Science, University of Kentucky, 40506, Lexington, Kentucky

    S. P. Agrawal (Graduate Research Assistant), G. A. Sargent (Associate Professor) & H. Conrad (Professor and Chairman)

Authors
  1. S. P. Agrawal
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  2. G. A. Sargent
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  3. H. Conrad
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Agrawal, S.P., Sargent, G.A. & Conrad, H. Deformation kinetics of α-titanium at low temperatures using stress relaxation. Metall Trans 4, 2613–2620 (1973). https://doi.org/10.1007/BF02644265

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  • DOI: https://doi.org/10.1007/BF02644265

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