Abstract
The deformation behavior of niobium-hydrogen alloys was investigated in the temperature range 125–500°C and at compositions up to H Nb of 0.9. High temperature tensile tests and fractographic studies were applied to determine the fracture mechanisms. It is shown that at T ≲ 450° C and H Nb ≳ 0.3 fracture occurs by a cleavage mode. The mechanism of this high temperature hydrogen embrittlement is discussed. The fracture mechanism is shown to be consistent with the stress induced formation and cleavage of NbH 2.
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