University of Illinois Urbana-Champaign

Atomistic scale experimental observations and micromechanical/continuum models for the effect of hydrogen on the mechanical behavior of metals

Sofronis, Petros; Robertson, Ian M.

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https://hdl.handle.net/2142/255

Description

Title
Atomistic scale experimental observations and micromechanical/continuum models for the effect of hydrogen on the mechanical behavior of metals
Author(s)
  • Sofronis, Petros
  • Robertson, Ian M.
Issue Date
2001-06
Keyword(s)
  • atomistic models
  • computational solid mechanics
  • continuum mechanics
  • elasticity
  • environmental effects
  • smart materials
  • fracture
  • granular materials
  • materials processing
  • micromechanics
  • plasticity
Abstract
In-situ deformation studies in a transmission electron microscope equipped with an environmental cell have shown that solute hydrogen increases the velocity of dislocations, decreases the stacking-fault energy, and increases the stability of edge character dislocations. Theoretical modeling has established that the hydrogen atmospheres formed at dislocations through the elastic interaction cause a change in the stress field of the dislocationhydrogen complex in such a manner as to reduce the interaction energy between it and other elastic obstacles. Consequently, solute hydrogen increases the mobility of dislocations, which will be localized to regions of high hydrogen concentration. On the basis of this material softening at the microscale, a solid mechanics analysis of the hydrogen solute interaction with material elastoplasticity demonstrates that localization of the deformation in the form of bands of intense shear can occur at the microscale. Thus, the present combined experimental and numerical/analytical results provide a clear explanation for the hydrogen-enhanced localized plasticity mechanism of hydrogen embrittlement.
Publisher
Department of Theoretical and Applied Mechanics (UIUC)
Series/Report Name or Number
TAM Reports 972
ISSN
0073-5264
Type of Resource
text
Language
en
Permalink
http://hdl.handle.net/2142/255
Copyright and License Information
Copyright owned by Petros Sofronis and Ian M. Robertson

Owning Collections

Technical Reports - Theoretical and Applied Mechanics (TAM) PRIMARY
TAM technical reports include manuscripts intended for publication, theses judged to have general interest, notes prepared for short courses, symposia compiled from outstanding undergraduate projects, and reports prepared for research-sponsoring agencies.