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Short-range reordering of heavy interstitials in Ta, Nb, and Fe during relaxation and static strain aging

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Abstract

With the help of isothermic relaxation tests and internal friction, we have studied the mechanism of a Snoek type reordering of heavy interstitials (oxygen, carbon, nitrogen) in tantalum, niobium, and iron. The kinetics and the amplitude of the stress relaxation conform to the general theory of the anelastic dipole due to Berry and Nowick. In an identical temperature range and on the same solid solutions, we have studied the effect of static strain aging on the yield point effect represented by the parameter Δϕ/ϕ. We show that, in accordance with the Schoeck and Seeger model, the first period of aging is due to the reorientation at short distance of the interstitials in the dislocation stress field. In fact, identification of the two phenomena leads to the relation Δϕ(t</ϕ =αΔs(t), with α close to the unity, which is in accordance with experiments.

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Authors and Affiliations

  1. Applied Mechanics Laboratory associated with the C.N.R.S., Faculty of Sciences and Techniques of Besançon, Route de Gray-La Bouloie, 25030, Besançon Cedex, France

    P. Delobelle (Engineer), D. Varchon (Engineer Fac.) & C. Oytana (Professor)

Authors
  1. P. Delobelle
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  2. D. Varchon
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  3. C. Oytana
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Delobelle, P., Varchon, D. & Oytana, C. Short-range reordering of heavy interstitials in Ta, Nb, and Fe during relaxation and static strain aging. Metall Trans A 16, 361–366 (1985). https://doi.org/10.1007/BF02814334

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  • DOI: https://doi.org/10.1007/BF02814334

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