Lee Chung-Hyo
Department of Advanced Materials Science and Engineering, Mokpo National University, Muan-gun, Chonnam, 58554, Korea.
J Nanosci Nanotechnol. 2019 Feb 1;19(2):888-891. doi: 10.1166/jnn.2019.15952.
We have applied mechanical alloying (MA) to prepare nanocrystalline Fe₂CrSi Heusler alloy using a mixture of elemental FeCrSi powders. Its structural characterizaion and magnetic properties have been studied by X-ray diffraction, differential scanning calorimeter and vibrating sample magnetometer measurements. -(Fe,Cr,Si) BCC phases coupled with amorphous phase are obtained after 40 hours of MA. The saturation magnetization (Ms) of MA powders decreases with MA time due to the magnetic dilution by alloying with nonmagnetic Cr and Si elements. A Fe₂CrSi Heusler alloy can be synthesized by MA for 40 h coupled with subsequent heat treatment. X-ray diffraction result shows that the average grain size of Fe₂CrSi Heusler alloys prepared by MA for 40 h and heat treatment at 500 °C is in the range of 88 nm. Ms of MA powders after heat treatment at 500 °C and 650 °C are found to be 63 emu/g and 79 emu/g, respectively. Ms of Fe₂CrSi Heusler alloys by MA in this study is low value compared with other Fe-based Heusler alloys, probably being attributed to the formation of nonmagnetic Cr3Si phase with further annealing.
我们已应用机械合金化（MA）方法，使用元素FeCrSi粉末混合物制备纳米晶Fe₂CrSi休斯勒合金。通过X射线衍射、差示扫描量热仪和振动样品磁强计测量对其结构特征和磁性进行了研究。机械合金化40小时后获得了-(Fe,Cr,Si)体心立方相和非晶相的耦合结构。由于与非磁性Cr和Si元素合金化导致的磁稀释，机械合金化粉末的饱和磁化强度（Ms）随机械合金化时间而降低。通过40小时的机械合金化并随后进行热处理，可以合成Fe₂CrSi休斯勒合金。X射线衍射结果表明，经40小时机械合金化并在500℃热处理制备的Fe₂CrSi休斯勒合金的平均晶粒尺寸在88nm范围内。发现在500℃和650℃热处理后的机械合金化粉末的Ms分别为63emu/g和79emu/g。与其他铁基休斯勒合金相比，本研究中通过机械合金化制备的Fe₂CrSi休斯勒合金的Ms值较低，这可能归因于进一步退火时形成了非磁性Cr3Si相。
