Stability and clusterization of hydrogen-vacancy complexes in α-Fe: An ab initio study

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The Interaction of Dislocations and Hydrogen-vacancy Complexes and Its Importance for Deformation- induced Proto Nano-voids Formation in α-Fe (2015, background): “Further, we know that s ~ ffiffiffi r p (Taylor, 1934, 1938) and _ε ~ r, where r is dislocation density.”
Hydrogen in tungsten: Absorption, diffusion, vacancy trapping, and decohesion (2010, background): “As seen in other bcc metals, vacancies can trap multiple H atoms.(73,74) Additional H atoms placed into octahedral sites surrounding the vacancy are predicted to bind exothermically to the vacancy (Table IV).”
Hydrogen assisted crack initiation and propagation in a nickel-based superalloy (2016, background): “Indeed, atomic simulations suggest that hydrogen is able to stabilize vacancies by formation of a hydrogen-vacancy complex, which can act as an embryo for void formation [29, 55].”