کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1617069 1005677 2011 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Grain boundary microstructure in DyF3-diffusion processed Nd–Fe–B sintered magnets
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Grain boundary microstructure in DyF3-diffusion processed Nd–Fe–B sintered magnets
چکیده انگلیسی

The effect of post-sinter tempering on the DyF3-diffusion processed Nd–Fe–B was investigated using two kinds of starting magnets. The increase of coercivity after diffusion process using as-sintered magnet was higher than that using two-stage tempered magnet. The grain boundary phase of the tempered magnet became discontinuous upon further annealing at the temperature of diffusion process. This clearly indicates that a continuous grain boundary phase is helpful to the DyF3-diffusion process. When sufficiently diffused, there is no enrichment of Dy in the grain boundary phase. The excess Nd as a result of Dy substitution in the Nd2Fe14B matrix phase forms Nd–O phase at grain boundary and on the surface of the magnet. The increase of coercivity can be related to the (Nd,Dy)2Fe14B grains as well as to the improved decoupling by the grain boundary phase.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 509, Issue 30, 28 July 2011, Pages 7909–7914
نویسندگان
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