processed by the hydrogenation, disproportionation, desorption and recombination (HDDR) process
Y C Sui; Z D Zhang; W Liu; Q F Xiao; X G Zhao; T Zhao; Y C Chuang; Y C Sui; Institute of Metal Research, Academia Sinica, Shenyang 110015, People's Republic of China and International Center for Material Physics, Academia Sinica, Shenyang 110015, People's Republic of China; Z D Zhang; Institute of Metal Research, Academia Sinica, Shenyang 110015, People's Republic of China and International Center for Material Physics, Academia Sinica, Shenyang 110015, People's Republic of China; W Liu; Institute of Metal Research, Academia Sinica, Shenyang 110015, People's Republic of China and International Center for Material Physics, Academia Sinica, Shenyang 110015, People's Republic of China; Q F Xiao; Institute of Metal Research, Academia Sinica, Shenyang 110015, People's Republic of China and International Center for Material Physics, Academia Sinica, Shenyang 110015, People's Republic of China; X G Zhao; Institute of Metal Research, Academia Sinica, Shenyang 110015, People's Republic of China and International Center for Material Physics, Academia Sinica, Shenyang 110015, People's Republic of China; T Zhao; Institute of Metal Research, Academia Sinica, Shenyang 110015, People's Republic of China and International Center for Material Physics, Academia Sinica, Shenyang 110015, People's Republic of China; Y C Chuang; Institute of Metal Research, Academia Sinica, Shenyang 110015, People's Republic of China and International Center for Material Physics, Academia Sinica, Shenyang 110015, People's Republic of China
Журнал:
Journal of Physics: Condensed Matter
Дата:
1998-01-19
Аннотация:
The hydrogenation, disproportionation, desorption and recombination (HDDR) process has been employed to produce -based permanent magnets. The master alloys for HDDR are -based alloys which are obtained by annealing mechanically alloyed (MA) powder at . The disproportionation reaction at results in the formation of an intimate mixture of Nd-hydride, and . On desorbing the hydrogen at the same temperature, different constituents recombine to form the thermodynamically stable and the Nd-rich phase, depending sensitively on recombination time and slightly on hydrogenation time. The phases obtained by HDDR at consist of , the Nd-rich phase and , whereas those obtained at are of , the Nd-rich phase and a small amount of . For comparison, the -based alloys have also been processed by HDDR, in which more and Nd-rich phases are found to coexist with after recombination at the same temperature. The -based alloy made by MA in conjunction with HDDR has better magnetic properties than that made by MA only.
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