HIGH COERCIVITY IN NANOSTRUCTURED PRCO5-BASED POWDERS PRODUCED BY MECHANICAL MILLING AND SUBSEQUENT ANNEALING
HIGH COERCIVITY IN NANOSTRUCTURED PRCO5-BASED POWDERS PRODUCED BY MECHANICAL MILLING AND SUBSEQUENT ANNEALING
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DOI：
10.1063/1.125265
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发表时间：
1999-11
影响因子：
4
通讯作者：
Zhong-wei Chen;X. Meng-Burany;G. Hadjipanayis
中科院分区：
文献类型：
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作者：
Zhong-wei Chen;X. Meng-Burany;G. Hadjipanayis
纳米结构的 PrCo5 基 PrxCo100−x (x=15.4–20.5) 粉末是通过机械铣削和随后的退火铸造合金合成的。化学计量的 PrCo5 粉末经过研磨 4 小时并在 800 °C 下退火 1 分钟，具有最佳的整体性能，具有 16.3 kOe 的高矫顽力、0.66 的高 Mr/Ms 比以及 11.6 MGOe 的中等强度最大能量积。 Pr19Co81 粉末获得了 23.7 kOe 的最高矫顽力。微观结构研究表明，粉末中形成了平均晶粒尺寸约为15 nm的均匀PrCo5微观结构，其平均晶粒尺寸约为5 μm。观察到的磁硬化被认为是由 PrCo5 相的高各向异性场和所使用的加工形成的均匀纳米级微观结构引起的。
Nanostructured PrCo5-based PrxCo100−x (x=15.4–20.5) powders have been synthesized by mechanical milling and subsequent annealing cast alloys. The best overall properties have been developed in stoichiometric PrCo5 powders milled for 4 h and annealed at 800 °C for 1 min with a high coercivity of 16.3 kOe along with a high Mr/Ms ratio of 0.66 and medium-strength maximum-energy product of 11.6 MGOe. The highest coercivity of 23.7 kOe has been obtained in Pr19Co81 powders. Microstructural studies reveal that a uniform PrCo5 microstructure with an average grain size of about 15 nm is developed in the powders, which have an average particle size of about 5 μm. The observed magnetic hardening is believed to arise from the high anisotropy field of the PrCo5 phase and the uniform nanoscale microstructure developed by the processing used.