Effect of mechanical milling and heat treatment on the structure and magnetic properties of gas atomized Mn–Al alloy powders

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• 作者：Jung-Goo Lee^a ;   ; ^{jglee36@kims.re.kr} ; Xiao-Lei Wang^a ;   ; ^b ; Zhi-Dong Zhang^b ; ChuI-Jin Choi^a
• 关键词：Mn&ndash ; Al powders ; Mechanical milling ; Annealing ; Magnetic properties
• 刊名：Thin Solid Films
• 出版年：2011
• 出版时间：30 September 2011
• 年：2011
• 卷：519
• 期：23
• 页码：8312-8316
• 全文大小：1143 K
• ISSN：S0040609011007516

文摘

Ferromagnetic Mn–Al alloy powders were fabricated by mechanical milling and heat treatment with gas-atomized powders. Different processes, i.e., heat treatment before ball milling and ball milling before heat treatment, result in different microstructures and magnetic properties of the powders. It was found that H_c increased and M_r decreased with the size reduction regardless of the sequence of heat treatment and ball milling. However, tendency of the change in H_c and M_r depended on the sequence. Further annealing of the powders ball-milled after heat treatment resulted in slight decrease of H_c and large increase of M_r. The magnetic properties, M_r = 41.2 emu/g, H_c = 3.1 kOe, were obtained from the powders ball-milled for 5 h after heat treatment at 650 °C for 20 min, and subsequent annealing at 280 °C for 20 min.