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Deformation mechanisms in commercial Ti (0.5 at. pct oineq) at intermediate and high temperatures (0.3 - 0.6 tinm)

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Abstract

The plastic flow of the commercial titanium material Ti-50A (0.5 at. pct Oeq) of 22 μm grain size was investigated over the temperature range of 600 to 1150 structure) and strain rates of 3 x 10-5 to 3 x 10-2 per s employing both constant strain rate and strain rate cycling tests. Dynamic strain aging occurred in the temperature range of 600 to 850 (0.31 to 0.44Tm) with an activation energy of 50 kcal per mole derived from the start of serrations in the stress-strain curves, maxima in strain hardening and minima in ductility. This value is in accord with that for the diffusion of oxygen in titanium. At temperatures above 850 (0.46 to 0.59Tm) the data were very well represented by Weertman’s glide and climb high temperature creep mechanism, giving εskT/Dμb= 1.1 x 106 (σ/μ)4.55 withD = 1.0 x exp (- 57,800/RT). The value of 57.8 kcal per mole is in accord with available self-diffusion data for titanium.

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Authors and Affiliations

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

    M. Doner (Research Associate) & H. Conrad (Professor and Chairman)

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  1. M. Doner
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  2. H. Conrad
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Doner, M., Conrad, H. Deformation mechanisms in commercial Ti (0.5 at. pct oineq) at intermediate and high temperatures (0.3 - 0.6 tinm). Metall Trans 4, 2809–2817 (1973). https://doi.org/10.1007/BF02644581

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  • DOI: https://doi.org/10.1007/BF02644581

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