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


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.


Niobium Hydrogen Concentration Strain Rate Sensitivity Hydrogen Embrittlement Resolve Shear Stress 
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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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