HYDROGENATION OF MULTICOMPONENT ZR-BASE C15 TYPE ALLOYS

A series of multicomponent Zr-base AB(2) alloys (Zr-Mn-Ni, Zr-Ti-Mn-Ni, Zr-Mn-V-Ni, and Zr-Mn-V-Co-Ni) were prepared. The major phase in the alloys had a C15-type structure with the lattice parameter varying with the atomic radii of A and B atoms. Absorption and desorption of hydrogen gas were performed in a Sievert's apparatus. The kinetics of the first few cycles of hydriding-dehydriding was collected. The P-C-T curves were also established for these alloys. It was found that these kinetic and thermodynamic properties were highly dependent on the solid solution in atomic site of A or B. The hydrogenation properties are explained based on the composition, the alloying element. and the free cell volume of the alloys.