THE HYDRIDING KINETICS OF M1NI(5) .2. EXPERIMENTAL RESULTS

The hydriding kinetics of MINi(5) before and after activation were stu died experimentally and discussed in terms of the models presented in Part I. The parameters in the kinetic equations previously obtained we re determined. The experimental data were in excellent agreement with the equations. The results indicate that the first hydrogenation proce ss is a phase transformation process, in which the nucleation and grow th of beta-phase is the hydriding rate-controlling step. After activat ion, the hydriding process is governed by a mixed-controlled mechanism , with the hydriding controlling step varying with the applied pressur e and transformed fraction. Copyright (C) 1996 International Associati on for Hydrogen Energy.