Microstructure, ductility and hydrogen permeability of Nb-Ti-Zr-Ni alloys

Abstract

A series of Nb40TixTiZr12Ni48-x alloys with different Ti/Ni ratios were prepared by arc melting in a purified argon atmosphere. The Ti/Ni ratio affected microstructures, crystal structures, ductility and hydrogen permeability (Φ) of these alloys. The values of hydrogen permeability Φ for the Nb40TixZr 12Ni48-x alloys increased with increasing temperature and were higher than those of pure Pd above 573 K. Hydrogen permeability at 673 K, i.e.. Φ67K and the volume fraction of the primary phase in the Nb40TixZr12Ni48-x alloys increased with increasing Ti/Ni ratio. The present work demonstrated that hydrogen permeation properties of the Nb40Ti20Zr 12Ni28 alloy are superior to those of the Nb 40Ti18Zr12Ni30 one which was reported to be the best one in the Nb40Ti30-xZr xNi30 alloys. © 2008 The Japan Institute of Metals.