Atom probe study on the bulk nanocomposite SmCo/Fe permanent magnet produced by ball-milling and warm compaction

作者：Xiong X Y^*; Rong C B; Rubanov S; Zhang Y; Liu J P

来源：Journal of Magnetism and Magnetic Materials, 2011, 323(22): 2855-2858.

DOI：10.1016/j.jmmm.2011.06.035

• SmCo permanent magnet
• Nanocomposite
• Microstructure
• Atom probe tomography
• TEM
• Ball-mill

The microstructure and compositions of the bulk nanocomposite SmCo/Fe permanent magnet were studied using transmission electron microscopy and 3-dimensional atom probe techniques. The excellent magnetic properties were related to the uniform nanocomposite structure with nanometer alpha-Fe particles uniformly distributed in the SmCo phase matrix. The alpha-Fe phase contained similar to 26 at% Co, and the SmCo phase contained similar to 19 at% Fe, confirming that the interdiffusion of Fe and Co atoms between the two phases occurred. The formation of the alpha-Fe(Co) phase explained why the saturation magnetization of the nanocomposite permanent magnet was higher than that expected from the original pure alpha-Fe and SmCo(5) powders, which enhanced further the maximum energy product of the nanocomposite permanent magnet.

• 出版日期2011-11