Донецкий национальный технический университет, ул. Артема 58, 83000 ДонецкThe kinetics of hydrogen-induced direct phase transformation, i.e. decomposition process of Y 2 Fe 17 initial alloy at interaction with hydrogen on YH 2 hydride phase and a-Fe phase of iron, in Y 2 Fe 17 hard magnetic alloy has been studied. It has been established that, as the temperature increase from 610 to 750˚С, a direct phase transformation significantly accelerates. The activation energy of phase transformation process has been determined from kinetic data (163÷242 kJ/mol) that it is correspond to the values of activation energy of the iron atoms diffusion in R-T type alloys. It has been shown that the kinetics of hydrogen-induced direct phase transformation in Y 2 Fe 17 hard magnetic alloy is controlled by the Fe atoms diffusion to growing new a-Fe phase centers.

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Kinetics of hydrogen-induced reverse phase transformation, i.e. recombination process of decomposed of YH 2 hydride phase and α-Fe phase of iron in initial phase of Y 2 Fe 17 hard magnetic alloy has been studied. It has been established that, as the temperature increase from 650 to 750 ⁰ C, a reverse phase transformation significantly accelerates. The activation energy of phase transformation process has been determined from kinetic data (227÷383 kJ / mol) that it is correspond to the values of activation energy of the Fe atoms diffusion in R -T type alloys. It has been shown that the kinetics of hydrogen-induced reverse phase transformation in Y 2 Fe 17 hard magnetic alloy is controlled by the Fe atoms diffusion to growing new Y 2 Fe 17 phase centers.

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