Anomalous Strain Rate Dependence of the Serrated Flow in Ni - H and Ni - C - H Alloys

Abstract

Serrated flow in Ni-H, Ni-C-H, and Ni-C alloys was studied over a wide range of temperature and strain rates. The results for C related serrated flow in Ni-C or Ni-C-H alloys were in excellent agreement with previous results and were consistent with dislocation pinning by C solutes at the dislocation cores. Hydrogen related serrated yielding was observed in Ni-H and Ni-H-C alloys. Solute C had only a small effect on the temperature range of this H related serrated flow. The results could be interpreted on the basis of hydride formation at the dislocation cores and diffusion of H in these hydrides. Keywords: Nickel; Nickel alloys; Hydrogen; Serrated flow; Portevin-LeChatalier effect; Dislocations; Stress Strain relations.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1989
Accession Number
ADA213244

Entities

People

  • A. Kimura
  • Howard K. Birnbaum

Organizations

  • University of Illinois Urbana–Champaign

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Agreements
  • Alloys
  • Atmospheres
  • Chemical Analysis
  • Critical Temperature
  • Diffusion
  • Energy
  • Engineering
  • Low Temperature
  • Materials
  • Materials Science
  • Nickel Alloys
  • Solid Solutions
  • Strain Rate
  • Stress Strain Relations
  • Stresses

Readers

  • Marine Propulsion Engineering and Naval Architecture
  • Materials Science and Engineering.