کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8155315 | 1524817 | 2016 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Quantification of the strain-induced promotion of Ï-MnAl via cryogenic milling
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
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چکیده انگلیسی
Ferromagnetic Ï-MnAl is a promising material for permanent magnetic applications due to its high density-compensated energy product; however, the transformation pathway from its high-temperature parent ϵ-phase remains poorly understood. In this work the evolution of phase composition, microstructure, chemical order and magnetic attributes accompanying the direct (i.e., without annealing) transformation of ϵ-MnAl to Ï-MnAl has been quantified as a function of time spent processing via mechanical milling at cryogenic temperatures. These results provide unique and enabling information to better define the processing window for obtaining and optimizing metastable Ï-MnAl from the quenched-in ϵ-phase. It is revealed that moderate microstrain level promotes the direct formation of Ï-MnAl with a high degree of chemical order, attributed to a previously reported displacive shear mechanism. Higher microstrain levels degrade the chemical order in the Ï-phase and attributed to antiferromagnetically coupled Mn-Mn nearest neighbor pairs that donate a complicated evolution of the saturation magnetization. These results provide useful insights for the development of future processing protocols for the manufacture of Ï-MnAl as a permanent magnetic material.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 404, 15 April 2016, Pages 215-220
Journal: Journal of Magnetism and Magnetic Materials - Volume 404, 15 April 2016, Pages 215-220
نویسندگان
Luke G. Marshall, Ian J. McDonald, L.H. Lewis,