کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1800186 1524886 2013 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Combined effects of chromium and carbon on phase formation and magnetic behavior of melt-spun Sm–Co magnets
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Combined effects of chromium and carbon on phase formation and magnetic behavior of melt-spun Sm–Co magnets
چکیده انگلیسی

The effects of Cr and C additions on the structures and magnetic properties of Sm–Co alloys have been investigated. x-ray diffraction revealed that the metastable TbCu7-type structure was formed during melt spinning at 40 m/s. The lattice parameters varied with Cr and C content, suggesting dissolution of the alloying additions in the SmCo7 structure. Increasing Cr and C content also promoted the formation of an amorphous phase, as indicated by both x-ray diffraction and differential thermal analysis. The alloying additions significantly refined the microstructural scale from ∼1 μm for the simple binary Sm12Co88 alloy to approximately 30 nm for the sample with additions of 6 at% C and 9 at% Cr. The coercivity of the as-solidified samples increased from 0.5 kOe for the simple binary alloy to 9.8 kOe for the alloy modified with 3 at% C and 4.5 at% Cr. The coercivity was also found to be strongly dependent on the temperature of thermal treatments. The coercivity initially increased, and then dramatically decreased before again increasing at higher annealing temperatures. x-ray diffraction and TEM analysis suggest that the development of the ordered Sm2Co17 structure upon annealing may be influencing the coercivity. Differences in initial susceptibility of the annealed samples suggest a combination of domain wall pinning and nucleation-controlled magnetization mechanisms.


► Melt-spun Sm12Co88 samples modified by Cr and Cwere investigated.
► Cr and C promoted the formation of TbCu7-type structure and amorphous materials.
► The optimal as-annealed sample exhibited a coercivity of as high as 9.8 kOe.
► Unusual coercivitydependence on annealing temperatures was observed.
► Microstructural observations were associated with the magnetic behavior.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 333, May 2013, Pages 63–68
نویسندگان
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