Residual hydrogen (H2) gas in the analysis chamber of an atom probe instrument limits the ability to measure H concentration in metals and alloys. Measuring H concentration would permit quantification of important physical phenomena, such as hydrogen embrittlement, corrosion, hydrogen trapping, and grain boundary segregation. Increased insight into the behavior of residual H2 gas on the specime...

We report first-principles calculations which demonstrate that vacancies can combine with hydrogen impurities in bulk aluminum and play a crucial role in the embrittlement of this prototypical ductile solid. Our studies of hydrogen-induced vacancy superabundant formation and vacancy clusterization in aluminum lead to the conclusion that a large number of H atoms (up to 12) can be trapped at a s...

One of the basic mechanisms of radiation embrittlement of steels and welds is due to matrix damage. Embrittlement results in a raise in the ductile-to-brittle transition temperature, which is normally used as indicator of the degradation status of the material. Other methods different than mechanical tests can be used to follow embrittlement like small punch test, non-destructive measurements o...

Hydrogen embrittlement limits the service life of various metallic components by causing a transition from ductile to brittle failure inherently alloys. In this work, using first-principles calculations, effect interstitial hydrogen on ideal shear strength across metals (Al, Ni, Fe, Nb, Ti, and Zr) its implications plasticity are discussed. The presence led volumetric expansion, which in turn h...

A critical issue that needs to be addressed for wider utilization of hydrogen as fuel is protection against embrittlement during cryogenic storage it weakens the microstructure bonding force metals through penetration. Austenitic stainless steel, which usually used in vessels and well known its high resistance at room temperature, has also been reported vulnerable under temperatures. In additio...