An Investigation on Nanocrystalline TbCu7-Type SmCo6.4Si0.3Zr0.3C0.2 Alloys With Sm Partially Substituted by Various Light and Heavy Rare Earth Elements

作者：Feng, D. Y.; Zhao, L. Z.; Liu, Z. W.^*; Zhang, G. Q.

来源：IEEE Transactions on Magnetics, 2016, 52(12): 2102106.

DOI：10.1109/TMAG.2016.2595488

• Heat treatment
• magnetic properties
• nanocrystalline
• rare earth (RE) substitution
• SmCo7
• thermal stability

Conventional Sm-Co-based alloys have low glass forming ability, and thus are difficult to quench to nanocrystalline structure by rapid solidification. In this paper, nanocrystalline [Sm, rare earth (RE)] Co6.4Si0.3Zr0.3C0.2 (RE = Ce, Sm, Gd, Ho, and Er) alloys have been obtained by melt spinning after compositional modification, as prepared alloys have a microstructure consisting of TbCu7-type SmCo7-based nanocrystals with the mean size of approximately 20 nm surrounded by a soft amorphous phase and a cobalt phase. After annealing at 600 degrees C for 1 h, the alloys were well crystallized and the grains grew up to similar to 100 nm. Both the coercivity and the remanence have been enhanced significantly by annealing. The effects of the substituted RE elements on the magnetic properties and thermal stability were investigated. An annealed Sm0.8Er0.2Co6.4Si0.3Zr0.3C0.2 alloy showed the highest remanence of 0.59 T and (BH)(max) of 58.8 kJ/m(3). Excellent thermal stability with the remanence temperature coefficient a of -0.0178%/degrees C and -0.0778%/degrees C at temperature range of 27 degrees C similar to 200 degrees C and 27 degrees C similar to 400 degrees C, respectively, was also obtained.

• 出版日期2016-12
• 单位华南理工大学