Influence of Hydrogen Impurity in Palladium on Migration of Tilt Grain Boundaries

Resumo

The paper investigates the influence of the hydrogen impurity in palladium on the migration of tilt grain boundaries with <111> and <100> misorientation axes. It is shown that the migration velocity of grain boundaries decreases with the increasing hydrogen concentration in palladium, and at 50% hydrogen concentration it is approximately twice as slow as in pure palladium. Moreover, during the transition from low- to high-angle grain boundaries, their migration mechanism does not qualitatively change. The ordered networks of atomic displacements are observed, with square (for <100> grain boundary) and hexagonal (for <111> grain boundary) networks which reduce in size with the increasing misorientation angle.