Magnetic and structural properties of heat-treated high-moment mechanically alloyed MnAlC powders

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• 作者：O. Obi ; L. Burns ; Y. Chen ; T. Fitchorov ; S. Kim ; K. Hsu ; D. Heiman ; L.H. Lewis ; V.G. Harris
• 关键词：Mn&ndash ; Al&ndash ; C alloys ; Mechanical alloying ; Permanent magnets ; Magnetic measurements
• 刊名：Journal of Alloys and Compounds
• 出版年：2014
• 出版时间：5 January, 2014
• 年：2014
• 卷：582
• 期：Complete
• 页码：598-602
• 全文大小：924 K

文摘

Annealing conditions, including annealing atmosphere and gas flow rate, upon the magnetic and structural properties of mechanically alloyed (MA) Mn_0.53Al_0.47?xC_x (x = 0-0.015) alloy powders were systematically investigated. The gas flow rate produced the most significant effect on the stabilization of the magnetic ¦Ó phase resulting in magnetization M_(H=10kOe) = 72 emu/g, remanent magnetization M_r = 37 emu/g and coercivity H_c = 1.9 kOe in optimized heat-treated MA Mn_0.53Al_0.46C_0.01 powders. Importantly, under the application of a 50 kOe magnetic field, M_(H=50kOe) increased to 97 emu/g which is the highest value measured to date for this system.