MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Alloying Effects on the Hydriding Properties of Niobium Metal
Kenji KomiyaShigeyuki ItoHiroshi YukawaMasahiko MorinagaKensuke NagataTomonori NambuHisakazu Ezaki
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2003 Volume 44 Issue 9 Pages 1686-1689

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Abstract

Niobium metal forms two kind of hydrides, NbH and NbH2, by hydrogenation, and the corresponding plateau region appears at low and high hydrogen permeable regions in the PCT curve of the Nb–H system. However, alloying effects have never been investigated in this system. In the present study, alloying effects were firstly investigated with various binary Nb–3 mol%M and Nb–5 mol%M alloys. Here M’s were 4d transition metals, Zr, Mo, Ru, Rh and Pd, all of which were soluble in bcc Nb. The stability of each hydride was found to be varied with the addition of a small amount of alloying elements into niobium metal. For example, the β (NbH) phase became most unstable by the addition of Ru, whereas δ (NbH2) phase became most unstable by the addition of Mo. These data will be useful for the design of hydrogen permeable niobium-based membranes.

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© 2003 The Japan Institute of Metals and Materials
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