کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1804019 1524899 2008 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Structure and some magnetic properties of mechanically synthesized and thermally treated Co–Fe–Ni alloys
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Structure and some magnetic properties of mechanically synthesized and thermally treated Co–Fe–Ni alloys
چکیده انگلیسی

Mechanical alloying method was applied to prepare nanocrystalline Co40Fe40Ni20, Co50Fe40Ni10, Co52Fe26Ni22 and Co65Fe23Ni12 alloys. X-ray diffraction, Mössbauer spectroscopy and magnetization measurements were used as complementary methods to obtain structural data and to determine magnetic properties of the as-milled as well as the thermally treated samples. X-ray diffraction proved that during mechanical alloying process the Co–Fe–based solid solution with BCC lattice was formed in the case of Co40Fe40Ni20 and Co50Fe40Ni10, while for Co52Fe26Ni22 and Co65Fe23Ni12 systems the Co–Ni–based solid solutions with FCC lattice were obtained. Mössbauer spectroscopy revealed hyperfine magnetic field distributions, which reflect the different surroundings of 57Fe isotopes by Co, Fe and Ni atoms, depending on the chemical composition of the alloy. The most probable atomic configurations were determined on the basis of the local environment model. Thermal treatment of the mechanosynthesized alloys led in some cases to decomposition of the suitable solid solution into the mixture of two solid solutions. In other cases, the phase composition of the alloys was stable or the type of the crystalline lattice was changed during annealing. Moreover, thermal treatment led to an increase in the grain size and a decrease in the level of internal strains that influenced the magnitudes of the effective magnetic moments and Curie temperatures of the investigated alloys.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 320, Issues 3–4, February 2008, Pages 413–420
نویسندگان
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