Kinetics of hydrogen-induced reverse phase transformation in Y2Fe17 magnetic alloy

摘要

A model is proposed for the kinetics of a hydrogen-induced reverse phase transformation, namely the recombination of a decomposed YH2 hydride phase and an alpha-Fe phase into the initial phase of a Y2Fe17 magnetic alloy. On the basis of the model, a kinetic equation is obtained to describe the kinetic curves of the reverse phase transformation as a function of transformation temperature and time. The proposed equation can be used to calculate the optimal conditions (temperature, time) during the reversible phase transformations in order to obtain the best magnetic properties of hydrogen-treated Y2Fe17 powders for use as permanent magnets.