Abstract The effect of milling time on the microstructural evolution and magnetic properties of a new Fe-based amorphous/nanocrystalline powder produced via mechanical alloying (MA) has been investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), differential scanning calorimetry (DSC) and vibrating sample magnetometer (VSM). The Rietveld refined XRD results show that the weight fraction of the amorphous phase increases to about 94% after 120 h of milling and then decreases to about 89% by further milling to 150 h due to partial crystallization. The contribution of lattice strain to solid-state amorphization has been discussed in the frame work of the Egami's topological instability model. The DSC measurements demonstrate that the obtained glassy powders after 120 h of milling have a high thermal stability, according to their wide supercooled liquid region of 75 K. The magnetic measurements indicate that saturation magnetization decreases continuously up to 50 h and then slightly increases after 150 h of milling. Simultaneously, magnetic coercivity rapidly increases and then notably decreases with the milling process. In addition, it has been shown that an annealing treatment at 673 K can significantly improve the soft magnetic properties of 120 h milled powders through the reduction of coercivity from 2.72 kA/m to 1.38 kA/m.

中文翻译：

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高热稳定性机械合金化制备新型Fe 70 Ta 5 Si 10 C 15 粉末的玻璃形成和磁性研究

摘要 通过 X 射线衍射 (XRD)、扫描电子显微镜 (SEM)、透射电镜 (SEM)、透射电镜 (SEM)、机械合金化 (MA) 方法研究了球磨时间对通过机械合金化 (MA) 生产的新型 Fe 基非晶/纳米晶粉末的微观结构演变和磁性能的影响。电子显微镜 (TEM)、差示扫描量热法 (DSC) 和振动样品磁强计 (VSM)。Rietveld 精制的 XRD 结果表明，非晶相的重量分数在研磨 120 小时后增加到约 94%，然后由于部分结晶，进一步研磨至 150 小时后降低到约 89%。在 Egami 的拓扑不稳定性模型的框架中讨论了晶格应变对固态非晶化的贡献。DSC 测量表明，研磨 120 小时后获得的玻璃态粉末具有较高的热稳定性，根据其 75 K 的宽过冷液体区域。磁测量表明饱和磁化强度持续降低至 50 小时，然后在 150 小时后略有增加。 h 铣削。同时，矫顽力随着铣削过程迅速增加然后显着降低。此外，研究表明，673 K 的退火处理可以通过将矫顽力从 2.72 kA/m 降低到 1.38 kA/m 来显着改善 120 h 研磨粉末的软磁性能。磁性测量表明饱和磁化强度持续降低至 50 小时，然后在研磨 150 小时后略有增加。同时，矫顽力随着铣削过程迅速增加然后显着降低。此外，研究表明，673 K 的退火处理可以通过将矫顽力从 2.72 kA/m 降低到 1.38 kA/m 来显着改善 120 h 研磨粉末的软磁性能。磁性测量表明饱和磁化强度持续降低至 50 小时，然后在研磨 150 小时后略有增加。同时，矫顽力随着铣削过程迅速增加然后显着降低。此外，研究表明，673 K 的退火处理可以通过将矫顽力从 2.72 kA/m 降低到 1.38 kA/m 来显着改善 120 h 研磨粉末的软磁性能。