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On the Portevin-Le Chatelier Effect Due to Snoek Strain Aging in the Niobium Oxygen System

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Abstract

Dynamic strain aging in niobium containing between 0.01 and 0.95 at. pct oxygen was investigated between 77 and 971 K using a nominal strain rate of 8.8 × 10-5 s-1. At higher oxygen concentrations both type A and type B serrations were observed between 355 and 422 K. It is proposed that all of this serrated flow is due to Snoek dynamic strain aging. This is supported by the appearance of the serrations at much lower temperatures than those normally associated with Cottrell strain aging and the observation that the time between the type A serrations on a stress strain curve equals the jump time of an oxygen atom. Strain rate sensitivity measurements were consistent with the generally accepted view that serrations occur only when the strain rate sensitivity becomes sufficiently negative.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, University of Florida, 32611, Gainesville, FL

    S. C. Park (Graduate Student) & R. E. Reed-hill (Professor)

  2. Metals and Ceramics Division, Materials Laboratories AFWAL/MLLS, Wright-Patterson Air Force Base, 45433, OH

    L. P. Beckerman (Metallurgist)

Authors
  1. S. C. Park
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  2. L. P. Beckerman
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  3. R. E. Reed-hill
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Park, S.C., Beckerman, L.P. & Reed-hill, R.E. On the Portevin-Le Chatelier Effect Due to Snoek Strain Aging in the Niobium Oxygen System. Metall Trans A 14, 463–469 (1983). https://doi.org/10.1007/BF02644223

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