Hydrogen embrittlement of Nb I—Macroscopic behavior at low temperatures

Effect of atomic scale plasticity on hydrogen diffusion in iron: Quantum mechanically informed and on-the-fly kinetic Monte Carlo simulations

“…Material degradation via the formation of brittle hydride phases, 9 possibly stabilized by local stresses, 10 is also a viable mechanism but has not been found to be relevant for iron, 1 which is the material of interest in this work. The HEDE mechanism postulates embrittlement due to localized reduction in cohesive strength induced by the segregation of hydrogen to defects such as grain boundaries, microcracks, notches, and second phase particles, among others.…”

Multiscale Modeling of Hydrogen Embrittlement

“…To regain the lattice discreteness, the integration of the γ-energy in Eq. (1.2) was discretized and replaced by a lattice sum in the original P-N formulation 4) with x i the reference position and ∆x the average spacing of the atomic rows in the lattice. This procedure, however, is inconsistent with evaluation of elastic energy in Eq.…”

“…In the past four decades, intense research on H embrittlement has been carried out and three general mechanisms of H embrittlement have been put forward, including (1) stressinduced hydride formation and cleavage of the brittle phase [3,4,5], (2) H enhanced local plasticity [6,7,8,9] and (3) H-induced de-cohesion and grain boundary weakening [10,11,12]. However, despite the impressive progress, the underlying atomic processes and the relative importance of the three mechanisms remain uncertain and controversial.…”

Hydriding of Titanium.

“…This fracture usually appears to be cleavage-like cracking that occurs either through the hydride phase or along the hydride-matrix interface[3031, [39][40][41][42]. The hydride phase is reportedly brittle and has different elastic properties from the parent lattice.…”