Dislocation structurs and mechanical properties of dehydrogenated niobium specimens were investigated by means of transmission electron microscopy and tensile test. Dehydrogenated specimens were prepared by vacuum annealing of a Nb-30 at% H alloy. The traces of hydride plates wereformed with tangled dislocations in a specimen dehydrogenated at lower temperatures, and the flow stress of such a specimen was very high. It is concluded that the high flow stress of the dehydrogenated specimen is due to the high density of dislocations and their heterogeneous distribution. The probable mechanism of the hydride formation is proposed.
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Amano et al. (1973) studied this question.
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