Abstract
Nd-Fe-B-type alloys have been characterized by means of in-situ electrical resistivity measurements. The potential of this technique for monitoring various phenomena relevant to the hydrogenation, disproportionation, desorption and recombination (HDDR) processing of Nd-Fe-B-type alloys is assessed, together with an evaluation of its capacity for delineating magnetic and phase transitions. The effects of external parameters, such as hydrogen pressure and processing temperature, and of intrinsic parameters, such as alloy composition and initial microstructure, on the kinetics of the solid-HDDR process have been investigated. It was found that the amount of neodymium-rich intergranular phase present in the material had a significant influence on the rates of disproportionation and recombination reactions. At 620‡C, the recombination process takes place as a solid-solid reaction, and this has a marked effect on the reaction rate. It was also found that the disproportionation process is very sensitive to the hydrogen pressure and the dependence of the overall process on the processing temperature between 620 and 900‡C has been determined.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
