Ti对高B含量纳米复合Nd9.4Fe79.6-xTixB11永磁合金显微结构和磁性能的影响

Effects of Ti Addition on Microstructure and Magnetic Properties of B-rich Nd9.4Fe79.6-xTixB11 Nanocrystalline Alloys

摘要:

研究了Ti添加对Nd9.4Fe79.6-xTixB11(x=0, 1, 2, 4, 6) 合金显微结构和磁性能的影响。结果表明，添加Ti能抑制Nd9.4Fe79.6-xTixB11合金中Nd2Fe23B3和Fe3B相的形成及α-Fe相的析出和长大，促进Nd2Fe14B相的形成。当Ti添加到一定量时，Ti能以TiB2质点的形式从合金中析出，TiB2质点能够抑制晶粒的长大，改善合金的显微结构。综合性能比较佳的Nd9.4Fe75.6Ti4B11合金薄带最佳退火工艺下剩磁Br为0.87 T，矫顽力Hcj达到931

Abstract:

The effects of Ti addition on the microstructure and magnetic properties of Nd9.4Fe79.6-xTixB11(x=0, 1, 2, 4, 6)nanocrystalline alloys were investigated. The results show that Ti addition suppresses the formation of unfavorable soft Nd2Fe23B3 and Fe3B phases, and promotes the formation of Nd2Fe14B phases. When the Ti content reaches a certain amount, Ti may precipitate as TiB2 from the alloys. TiB2 may serve as inoculants and promotes uniform nucleation, and thus increases the exchange coupling between the hard and soft phases. As a result, excellent magnetic properties of Br=0.87 T, Hcj=931 kA/m and (BH)max=115.4 kJ/m3 are achieved in Nd9.4Fe75.6Ti4B11 alloy ribbons.