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Low temperature strengthening in niobium-hydrogen single crystals

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Abstract

The mechanical behavior of high purity niobium and niobium-hydrogen single crystals at temperatures in the range 77° to 380°K was investigated. Thermally activated hardening by hydrogen in solution is appreciable at temperatures ≲150°K. However, hydride precipitation occurs at these temperatures, can be strain-induced during mechanical testing, and accounts for the largest part of the decrease in ductility in alloys with up to 720 at. ppm of hydrogen. The influence of hydrogen additions and the effects of purification on the low temperature flow stress of niobium demonstrate the large influence of interstitial solutes on the strength of bcc materials at low temperatures.

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Authors and Affiliations

  1. Central Research Laboratory, Semiconductor Products Division, Motorola, Incorporated, Phoenix, Arizona

    K. V. Ravi

  2. Division of Metallurgy and Materials Science, Case Western Reserve University, USA

    R. Gibala (Associate Professor)

Authors
  1. K. V. Ravi
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  2. R. Gibala
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Formerly Graduate Assistant, Division of Metallurgy and Materials Science, Case Western Reserve University, Cleveland, Ohio

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Ravi, K.V., Gibala, R. Low temperature strengthening in niobium-hydrogen single crystals. Metall Trans 2, 1219–1225 (1971). https://doi.org/10.1007/BF02664255

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  • DOI: https://doi.org/10.1007/BF02664255

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