Effect of Surface Modification by Ion Implantation on Hydrogenation Property of TiFe Alloy

In order to improve initial activation properties of TiFe alloy, simple ion implantation and ion mixing with the deposition of LaNi 5 were carried out at room temperature. The results show that argon-ion mixing caused extensive improvement of initial activation, wherein hydrogenation was easily effected at 373 K and 1 MPa. Those results are related to several irradiation effects; the re-crystallization of amorphous film of LaNi 5 and the local segregation of composed elements. Both of these irradiation effects greatly improve the initial hydrogenation process of TiFe alloy.