Transmission electron microscopy observations and micromechanical/continuum models for the effect of hydrogen on the mechanical behaviour of metals

P. Sofroni, I. M. Robertson

研究成果: Contribution to journalArticle査読

62 被引用数 (Scopus)

抄録

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 modelling has established that the hydrogen atmospheres formed at dislocations through the elastic interaction cause a change in the stress field of the dislocation-hydrogen 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 on 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 on the macroscale. Thus, the present combined experimental and numerical/ analytical results provide a clear explanation for the hydrogen-enhanced localized plasticity mechanism of hydrogen embrittlement.

本文言語英語
ページ(範囲)3405-3413
ページ数9
ジャーナルPhilosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties
82
17-18
DOI
出版ステータス出版済み - 11 2002
外部発表はい

All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • 材料科学(全般)
  • 凝縮系物理学
  • 物理学および天文学(その他)
  • 金属および合金

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