Magnetic properties and grain-boundary structure transition of melt-spun (Sm0.12Co0.87Cu0.01)97(VC)3 under annealing |
| |
Authors: | Liya Li Jianhong Yi Aru Yan |
| |
Institution: | a State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, PR China b Ninggbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, PR China |
| |
Abstract: | Effects of annealing treatment on the magnetic properties and microstructure of SmCo7-based magnets doped with VC and Cu were investigated. The coercivity of the as-spun ribbons (Sm0.12Co0.87Cu0.01)97(VC)3 was 3.6 kOe. It was increased to 7.3 kOe after annealing at 800 °C for 15 min. A fixed single 1:7H structure and regular 1:7H dendrite grains with long axes preferentially parallel to each other had been attained during rapid solidification and subsequent annealing treatment. However, TEM results revealed that there was grain-boundary phase rich in C and Cu besides 1:7H phase in the as-solidified ribbon. After annealing, the grain-boundary phase decomposed to Cu-, Sm- and C-rich intergranular phases. Cu-, Sm- and C-rich regions formed at the grain boundaries after annealing improved the coercivity of (Sm0.12Co0.87Cu0.01)97(VC)3 by decreasing the magnetostatic interactions and act as effective domain wall pinning sites. |
| |
Keywords: | Microstructure Coercivity Grain boundary Cu VC |
本文献已被 ScienceDirect 等数据库收录! |
|