LAUSR

Abstract The Nb19Ti40Ni41 alloy has a lamellar structure with bcc-Nb and B2-TiNi phases. It is known that a granule Nb phase forms in the TiNi matrix after thermal annealing and that the hydrogen permeability of unrolled annealed alloy is higher than that of rolled annealed alloy, even though the two alloys have granule Nb phase. Although the “cube-on-cube” relationship of crystal orientation for these phases has been observed in unrolled annealed alloy, no specific crystal orientation relationship has been seen in rolled annealed alloy. This indicates that the crystal orientation between the two phases strongly affects hydrogen permeability in Nb-TiNi two-phase alloys.