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Effect of milling on the magnetic properties of Al-Mn obtained by mechanical alloying

机译:铣削对机械合金化获得的Al-Mn磁性的影响

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Al-Mn powders were prepared to obtain the compound Mn_(42)Al_(58) by mechanical alloying. The powders were milled during different periods (1 h, 5 h, 11.5 h, 15 h, 20 h and 50 h) using a SPEX 8000 mixer mill in nitrogen atmosphere. The materials were characterized by X-ray diffraction (XRD) and magnetic properties at room temperature, using a vibrating sample magnetometer (VSM). XRD shows partial transformation to α-Mn after only 1 h of milling and a mixture of α-Mn and β-Mn after 11.5 h of milling and further milling resulted in transformation to β-Mn phase with a grain size of 6 nm after 50 h. The change in magnetic properties with milling time is quite dramatic, from a ferromagnetic behavior for α-Mn(Al) to paramagnetic after 11.5 h of milling and showing again ferromagnetic behavior, with a strong increase of magnetization values of 5.5 emu/g, after 50 h of milling with formation of β-Mn(Al).
机译:制备Al-Mn粉末,通过机械合金化得到化合物Mn_(42)Al_(58)。使用SPEX 8000混合机在氮气氛下,将粉末在不同的时间段(1小时,5小时,11.5小时,15小时,20小时和50小时)研磨。使用振动样品磁力计(VSM)对材料进行了X射线衍射(XRD)和室温下的磁性能表征。 XRD显示仅在铣削1小时后部分转变为α-Mn,在铣削11.5 h之后又出现α-Mn和β-Mn的混合物,进一步铣削后50转变为晶粒度为6 nm的β-Mn相H。磁性随铣削时间的变化非常显着,从铣削11.5小时后的α-Mn(Al)的铁磁行为到顺磁,并再次显示出铁磁行为,在经过铣削后,磁化强度大大提高了5.5 emu / g。研磨50小时,形成β-Mn(Al)。

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