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For the group 5 metals, even in an ambient hydrogen atmosphere (pressure), a large amount of hydrogen dissolves into them and severe hydrogen embrittlement occurs. This means that there is a large barrier to the practical application of these metals as a hydrogen permeation membrane for hydrogen separation and purification. In this study, we have found that a ductiletobrittle transition occurs for the niobium (Nb) or vanadium (V) metals as a function of the ``hydrogen concentration'', by using a special setup of the insitu small punch (SP) testing apparatus equipped with a gasflow system. This paper deals with a definition for the discovered phenomenon that group 5 metals have hydrogen concentration which changes from ductiletobrittle fracture (DBTC: DuctiletoBrittle Transition hydrogen Concentration). The grain size and the alloying effects of tungsten (W) and molybdenum (Mo) on the DBTC of Nb or V have also been clarified. Using this advanced approach, the importance of the DBTC analyses is described on the design of group 5 metal based hydrogen permeation membranes. [doi:10.2320/jinstmet.JC201313]

Determination of Ductile-to-Brittle Transition Hydrogen Concentrations (DBTC) for Group 5 Hydrogen Permeable Membranes Using In-Situ Small Punch Test