研磨对Mn54Al46结构和磁性的影响
首发时间:2017-05-10
摘要:为了提升MnAl-τ相的永磁性质,本文对纯MnAl-τ相样品研磨不同时间,并结合XRD进行结构分析和结合SEM进行形貌分析。研究发现,随着研磨时间的增加,XRD结果显示MnAl-τ相并未发生分解,晶粒尺寸不断减小;SEM结果显示颗粒状的MnAl-τ相会逐渐变成薄片状;其矫顽力迅速增加而后达到饱和,研磨90min后达到最大值约5 kOe。而饱和磁化强度由于无序度的增加随着研磨时间显著减小,未研磨时饱和磁化强度为124.1 emu/g,研磨120 min后降到了16.5 emu/g。永磁性能最好的是研磨15 min后的样品,10 K下其矫顽力为6.0 kOe,剩磁为79.0 emu/g,最大磁能积为4.9MGOe。
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Effect of milling on the structure and magnetic properties of Mn54Al46
Abstract:To further improve the magnetic properties, the MnAl alloys have been grinded for various durations of time, and XRD and SEM were introduced to analyze the structures of MnAl-τ phase. As the grinding time increases, it was proved by XRD patterns that MnAl-τ phase didn’t decompose and the grain size decreased. What’s more, SEM pictures showed that the granular MnAl-τ phase gradually became flaky during grinding process. The coercivity increases quickly with longer grinding time and reaches its maximum of 5 kOe in about 90 minutes. The magnetization decreases from 124.1 emu/g to 16.5 emu/g after being grinded for 120 minutes, which is due to the increasing atomic disorder. The best magnetic properties of coercivity iHc=6.0 kOe, Mr=79 emu/g, and maximum energy product (BH)max=4.9 MGOe at 10K can be obtained from the 15-minute-grinding sample.
Keywords: condensed matter physics MnAl milling grain size
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