Hydrogen effects on mechanical responses of small volumes

William W Gerberich, N. I. Tymiak, J. Jungk, T. Wyrobek

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

3 Scopus citations

Abstract

Available hardness and thin film fracture data as affected by hydrogen at the film substrate interface are reviewed. At the nanometer scale, it appears that hydrogen can increase the yield point near the surface of stainless steels by nearly a factor of three. Additionally, it appears to reduce the resistance to interfacial delamination of Cu films from silicon substrates by about a factor of two. Based upon additional observations of small volumes without hydrogen, interfacial toughness appears to vary with a length scale to the 1/2 power while hardness at nanoscale depths may vary with a length scale to the 2/ 3 power. In both, there is reason to believe that the volume to surface ratio is an appropriate length scale in the nanometer range. Regarding film fracture, this strongly suggests that even in small volumes the volume/surface ratio is truncated by the hydrogen mechanism. Note that this ratio, as a length scale, could be diminished by hydrogen either causing brittle fracture, as in a cleavage or intergranular process, or by localizing fracture, as in a highly localized plastic rupture. The picture is complicated by the hardness in small volumes increasing. Both continuum and discretized dislocation models with a single length scale, a yield strength and a fracture criterion are capable of predicting hydrogen-reduced threshold stress intensities. The connectivity from the mesoscale to the continuum can be shown through the volume to surface ratio concept.

Original languageEnglish (US)
Title of host publicationHydrogen Effects on Material Behaviour and Corrosion Deformation Interactions - Proc. of the International Conference on Hydrogen Effects on Material Behaviour and Corrosion Deformation Interactions
EditorsN.R. Moody, A.W. Thompson, R.E. Ricker, G.S. Was, R.H. Jones
Pages153-164
Number of pages12
StatePublished - Dec 1 2003
EventInternational Conference on Hydrogen Effects on Material Behaviour and Corrosion Deformation Interactions - Moran, WY, United States
Duration: Sep 22 2002Sep 26 2002

Publication series

NameHydrogen Effects on Material Behaviour and Corrosion Deformation Interactions - Proc. of the International Conference on Hydrogen Effects on Material Behaviour and Corrosion Deformation Interactions

Other

OtherInternational Conference on Hydrogen Effects on Material Behaviour and Corrosion Deformation Interactions
CountryUnited States
CityMoran, WY
Period9/22/029/26/02

Fingerprint Dive into the research topics of 'Hydrogen effects on mechanical responses of small volumes'. Together they form a unique fingerprint.

  • Cite this

    Gerberich, W. W., Tymiak, N. I., Jungk, J., & Wyrobek, T. (2003). Hydrogen effects on mechanical responses of small volumes. In N. R. Moody, A. W. Thompson, R. E. Ricker, G. S. Was, & R. H. Jones (Eds.), Hydrogen Effects on Material Behaviour and Corrosion Deformation Interactions - Proc. of the International Conference on Hydrogen Effects on Material Behaviour and Corrosion Deformation Interactions (pp. 153-164). (Hydrogen Effects on Material Behaviour and Corrosion Deformation Interactions - Proc. of the International Conference on Hydrogen Effects on Material Behaviour and Corrosion Deformation Interactions).