A coexistent view of hydrogen effects on mechanical behavior of crystals: HELP and HEDE

W. W. Gerberich, D. D. Stauffer, Petros Sofronis

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The literature is now replete with publications extolling the virtues of hydrogen-enhanced localized plasticity (HELP) versus hydrogen-enhanced decohesion (HEDE). What this contribution desires to accomplish is separating the various stages of dislocation plasticity and fracture. To that end it is proposed that HELP almost always occurs but may have very different ramifications on the interpretation of dislocation nucleation and dislocation velocities. Similarly, whether or not decohesion or ductile rupture occurs in a given system cannot be divorced from the combinative effects of hydrogen on plasticity, except perhaps in rare cases. From a fracture mechanics viewpoint, a couple of plausible interactions of HELP and/or HEDE are described for hydrogen-enhanced cleavage, microvoid growth, or shear instability.

Original languageEnglish (US)
Title of host publicationProceedings of the 2008 International Hydrogen Conference - Effects of Hydrogen on Materials
Pages38-45
Number of pages8
StatePublished - Dec 1 2009
Event2008 International Hydrogen Conference - Effects of Hydrogen on Materials - Jackson, WY, United States
Duration: Sep 7 2008Sep 10 2008

Publication series

NameProceedings of the 2008 International Hydrogen Conference - Effects of Hydrogen on Materials

Other

Other2008 International Hydrogen Conference - Effects of Hydrogen on Materials
CountryUnited States
CityJackson, WY
Period9/7/089/10/08

ASJC Scopus subject areas

  • Materials Chemistry
  • Nuclear and High Energy Physics
  • Atomic and Molecular Physics, and Optics

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    Gerberich, W. W., Stauffer, D. D., & Sofronis, P. (2009). A coexistent view of hydrogen effects on mechanical behavior of crystals: HELP and HEDE. In Proceedings of the 2008 International Hydrogen Conference - Effects of Hydrogen on Materials (pp. 38-45). (Proceedings of the 2008 International Hydrogen Conference - Effects of Hydrogen on Materials).