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The uniaxial tensile test response of a H decorated $\Sigma$ 5 [100] twistgrain boundary (GB) in face-centered-cubic Al has been examined with firstprinciples. The impurity shows a strong tendency to relocate during loading. Tocapture these H movements, the standard model framework was extended to probeloading-unloading hysteresis. If the maximum tensile stress accepted by the Hdecorated GB in the slow fracture limit is reached before the maximumacceptable strain, exceeding this stress may trigger a H influx-controlleddestabilization, as opposed to 'immediate' breakage. Such 'delayed' failureappears likely whenever the H attraction to a GB displays a monotonic decreasewith increased loading.

H induced decohesion of an Al grain boundary investigated with first  principles: Proposed general conditions for instant breakage and delayed  fracture