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Metallurgical Transactions

, Volume 2, Issue 4, pp 1219–1225 | Cite as

Low temperature strengthening in niobium-hydrogen single crystals

  • K. V. Ravi
  • R. Gibala
Mechanical Behavior

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.

Keywords

Niobium Hydrogen Concentration Strain Rate Sensitivity Hydrogen Embrittlement Resolve Shear Stress 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© The Metallurgical Society of American Institute of Mining 1971

Authors and Affiliations

  • K. V. Ravi
    • 1
  • R. Gibala
    • 2
  1. 1.Central Research Laboratory, Semiconductor Products DivisionMotorola, IncorporatedPhoenix
  2. 2.Division of Metallurgy and Materials ScienceCase Western Reserve UniversityUSA

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