Abstract
The kinetics of solid-HDDR (hydrogenation, disproportionation, desorption, recombination) processing of Nd-Fe-B-type alloys have been characterized by means of in situ electrical resistivity measurements and hydrogen absorption and desorption studies on nondecrepitated samples. The fundamental differences in reaction rate and mechanism between a Nd16Fe76B8 as-cast and a homogenized stoichiometric Nd2Fe14B alloy at T=800 °C and p(H2)=0.7 bar are reported. The disproportionation and recombination rates were found to be significantly lower in the stoichiometric alloy, particularly in the case of the latter. The onset of the disproportionation and recombination reaction in Nd16Fe76B8 in a temperature range of T=780–880 °C under hydrogen atmosphere was investigated and these reactions were found to depend critically on the pressure. Low-temperature recombination at T=620 °C was studied by the development of the Curie-point resistance anomaly of the Nd2Fe14B matrix phase. It has been shown that the amount of reformed Nd2Fe14B matrix phase during recombination can be monitored by this method.
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