The internal friction at 25 kHz is investigated between 77 and 300 K on high‐purity molybdenum single crystals of different orientations after plastic deformation. After high‐temperature deformation the α‐peak at 130 K is observed. After low‐temperature deformation two damping peaks appear; the α1‐peak at 100 K and the α2‐peak between 140 and 200 K. The β‐peak is observed at 370 K after hydrogen annealing, plastic deformation, and low‐temperature annealing. It is suggested that the α1‐peak is related to kink‐pair formation on non‐screw (71°) dislocations and the α2‐peak to kink migration on screw dislocations. The α‐peak appears as a composed maximum with the two components α1 and α2. The β‐peak is attributed to the interaction of hydrogen with screw dislocations.
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