Effects of Ti and C additions on the nanostructure and magnetic properties of (Nd, Pr) (Fe, Co, Ga)B melt-spun nanocomposite ribbons

摘要

In this work the effects of Ti and C additions on the structure and magnetic properties of NdFeB nanocomposite permanent magnetic alloys with nominal composition of Nd_(9.4)Pr_(0.6)Fe_(bal.)Co _6B_6Ga_(0.5)Ti_xC_x (x=0, 1.5, 4.5) have been investigated. As-spun ribbons were examined by using X-ray diffractometer (XRD) and differential scanning calorimetry (DSC). The results show that Ti and C additions enhance the glass forming ability and increase crystallization temperature. XRD results of annealed ribbons indicate that Ti and C compose TiC. TEM observation reveals that the formation of TiC refines the microstructure of annealed ribbons consisting of 1.5 at% Ti and 1.5 at% C additions, which leads to enhancement of magnetic properties.