Revisiting hydrogen embrittlement models and hydrogen-induced homogeneous nucleation of dislocations

By R. Kirchheim. 2010

185 citations recorded by the source corpus.

Models explaining hydrogen embrittlement as caused by enhanced local plasticity are discussed in the light of a novel concept describing solute–defect interaction in a thermodynamic framework. Solute atoms segregating at defects with an excess Γ are called defactants because they lower the defect formation energy of defects γ , analagous to the action of surfactants with surfaces. The corresponding decrease is given by d γ  = − Γ d μ , where μ is the chemical potential of the defactant. This equation is applied to recent nanoindentation results, and reveals a lower energy barrier for the generation of dislocation loops in the presence of hydrogen.

Subfields: Materials Chemistry, Metals and Alloys

View Paper: https://www.semanticscholar.org/paper/6d6a59c70a06540219c83f0ec0a5cf0a5c5d7458

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In Materials Chemistry

1. Liang Wan
2. Jun-ping Du
3. A. Ishii
4. Hajime Kimizuka
5. Qingsong Mei
6. N. Ishikawa
7. W. Geng
8. S. Ogata

Citations in the corpus

• Hydrogen embrittlement controlled by reaction of dislocation with grain boundary in alpha-iron (2018, background): “…of intensive studies, the micro-scale mechanisms of the hydrogeninduced mechanical failure of materials remain a subject of debate (Gerberich, 2012; Kirchheim, 2010; Li et al., 2015; Li et al., 2017; Lynch, 2011; Nagumo, 2016; Neeraj et al., 2012; Novak et al., 2010; Robertson et al., 2012;…”