Journal
ACTA MATERIALIA
Volume 58, Issue 16, Pages 5274-5285Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2010.05.057
Keywords
Hydrogen embrittlement; Nanoindentation; Yield phenomena; Electrochemistry; Dislocation nucleation
Funding
- DFG [VE 132/25-1]
Ask authors/readers for more resources
In this paper, the intrinsic complexities of the experimental examination of hydrogen embrittlement are discussed. On the basis of these complexities, an experimental approach, in situ electrochemical nanoindentation, is proposed and performed on different materials. This technique is capable of registering the onset of plasticity in extremely small volumes, namely perfect crystals in hydrogen-free and charged conditions. It is shown that hydrogen reduces the required stress for the onset of plasticity, i.e. homogeneous dislocation nucleation by reduction in the shear modulus, dislocation line energy and stacking fault energy. The change in the shear modulus can be related to reduction in crystal cohesion whereas the reduction in dislocation line energy and stacking fault energy are explained by the defactant concept, i.e. reduction in the defect formation energy in the presence of hydrogen. Thus, neither hydrogen-enhanced decohesion nor hydrogen-enhanced plasticity, but the reduction in the cohesion and defect formation energy are responsible for hydrogen embrittlement. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available