Abstract
The effect of initial hydrogen pressure on growth kinetics of Nd<sub>2</sub>Fe<sub>14</sub>B phase during hydrogen-induced reverse phase transformation in the industrial Nd<sub>2</sub>Fe<sub>14</sub>B hard magnetic alloy has been studied. It has been determined that, as the temperature and the initial hydrogen pressure increase, a reverse phase transformation significantly accelerates. It has been shown that the kinetics of growth of Nd<sub>2</sub>Fe<sub>14</sub>B phase is controlled by the Fe atoms diffusion and that the rate growth of new Nd<sub>2</sub>Fe<sub>14</sub>B phase increase with increase of initial hydrogen pressure. On the base of the Kolmogorov-Hillert-Smirnov kinetic models the kinetic equation for describing of influence of initial hydrogen pressure on the isothermal kinetic diagram for this transformation has been proposed.
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