Tan Xiaohua, Li Heyun, Xu Hui, Han Ke, Li Weidan, Zhang Fang
Institute of Materials, School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China.
National High Magnetic Field Laboratory, Florida State University, 1800 E. Paul Dirac Drive, Tallahassee, FL 32310, USA.
Materials (Basel). 2017 Jul 28;10(8):869. doi: 10.3390/ma10080869.
Optimizing fabrication parameters for rapid solidification of Re-Fe-B (Re = Rare earth) alloys can lead to nanocrystalline products with hard magnetic properties without any heat-treatment. In this work, we enhanced the magnetic properties of CeFeB₆ ribbons by engineering both the microstructure and volume fraction of the Ce₂FeB phase through optimization of the chamber pressure and the wheel speed necessary for quenching the liquid. We explored the relationship between these two parameters (chamber pressure and wheel speed), and proposed an approach to identifying the experimental conditions most likely to yield homogenous microstructure and reproducible magnetic properties. Optimized experimental conditions resulted in a microstructure with homogeneously dispersed Ce₂FeB and CeFe₂ nanocrystals. The best magnetic properties were obtained at a chamber pressure of 0.05 MPa and a wheel speed of 15 m·s. Without the conventional heat-treatment that is usually required, key magnetic properties were maximized by optimization processing parameters in rapid solidification of magnetic materials in a cost-effective manner.
优化用于Re-Fe-B（Re =稀土）合金快速凝固的制备参数，可在无需任何热处理的情况下得到具有硬磁性能的纳米晶产品。在这项工作中，我们通过优化腔室压力和淬火所需的轮速，调控Ce₂FeB相的微观结构和体积分数，从而提高了CeFeB₆薄带的磁性能。我们探究了这两个参数（腔室压力和轮速）之间的关系，并提出了一种方法来确定最有可能产生均匀微观结构和可重复磁性能的实验条件。优化后的实验条件得到了一种具有均匀分散的Ce₂FeB和CeFe₂纳米晶体的微观结构。在腔室压力为0.05 MPa和轮速为15 m·s时获得了最佳磁性能。在不进行通常所需的传统热处理的情况下，通过以具有成本效益的方式优化磁性材料快速凝固过程中的工艺参数，关键磁性能得以最大化。
