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| Effect of Grain Boundary Modification on the Microstructure and Magnetic Properties of HDDR–treated Nd–Fe–B Powders |
| Journal of Magnetics, Volume 21, Number 1, 31 Mar 2016, Pages 51-56 |
Shu Liu (Powder & Ceramics Division, Korea Institute of Materials Science), Nam-Hyun Kang (Department of Materials Science and Engineering, Pusan National University), Ji-Hun Yu (Powder & Ceramics Division, Korea Institute of Materials Science), Hae-Woong Kwon (Department of Materials Science and Engineering, Pukyong National University), Jung-Goo Lee *  (Powder & Ceramics Division, Korea Institute of Materials Science) |
| Abstract |
The microstructure and magnetic properties of HDDR–treated powders after grain boundary diffusion process (GBDP) with Nd–Cu alloy at different temperatures have been studied. The variation of GBDP temperature had multifaceted influences on the HDDR–treated powders involving the microstructure, phase composition and magnetic performance. An enhanced coercivity of 16.9 kOe was obtained after GBDP at 700 °C, due to the modified grain boundary with fine and continuous Nd–rich phase. However, GBDP at lower or higher temperature resulted in poor magnetic properties because of insufficient microstructural modification. Especially, the residual hydrogen induced phenomenon during GBDP strongly depended on the GBDP temperature.
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| Keywords: Nd–Fe–B magnets; HDDR; Nd–Cu alloy; residual hydrogen |
| DOI: http://dx.doi.org/10.4283/JMAG.2016.21.1.051 |
| Full Text: PDF |
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