Crystallization and magnetic properties of Fe40Ni 38B18Mo4 amorphous alloy

S. W. Du; R. V. Ramanujan

doi:10.1016/j.jnoncrysol.2005.07.028

Crystallization and magnetic properties of Fe₄₀Ni ₃₈B₁₈Mo₄ amorphous alloy

S. W. Du, R. V. Ramanujan^*

^*Corresponding author for this work

Nanyang Technological University

Research output: Contribution to journal › Article › peer-review

32 Citations (Scopus)

Abstract

The crystallization behavior of heat treated amorphous Fe ₄₀Ni₃₈B₁₈Mo₄ alloy was studied by TEM in order to investigate the suitability of this material as a soft nanostructured magnetic alloy. Significantly, the phases observed during primary and secondary crystallization were nanosized Fe-Ni solid solution and (FeNiMo)₂₃B₆, respectively. The primary crystals had an unusual irregular morphology due to the presence of molybdenum. A twinned structure was observed by nanobeam diffraction within the Fe-Ni nanocrystals. The phase transformation mechanism was compared with that of Fe ₄₀Ni₄₀B₂₀ and Fe₄₀Ni ₄₀P₁₄B₆ alloys and the differences were analyzed from a thermodynamic point of view. The magnetic properties, M _s and H_c, were studied by VSM, it was found that improved soft magnetic properties were achieved by heat treatment. A mean crystal size of 10 nm and a volume fraction of 1% was found to be the microstructure which would yield the lowest coercivity.

Original language	English
Pages (from-to)	3105-3113
Number of pages	9
Journal	Journal of Non-Crystalline Solids
Volume	351
Issue number	37-39
DOIs	https://doi.org/10.1016/j.jnoncrysol.2005.07.028
Publication status	Published - Oct 1 2005
Externally published	Yes

ASJC Scopus Subject Areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Materials Chemistry

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10.1016/j.jnoncrysol.2005.07.028

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abstract = "The crystallization behavior of heat treated amorphous Fe 40Ni38B18Mo4 alloy was studied by TEM in order to investigate the suitability of this material as a soft nanostructured magnetic alloy. Significantly, the phases observed during primary and secondary crystallization were nanosized Fe-Ni solid solution and (FeNiMo)23B6, respectively. The primary crystals had an unusual irregular morphology due to the presence of molybdenum. A twinned structure was observed by nanobeam diffraction within the Fe-Ni nanocrystals. The phase transformation mechanism was compared with that of Fe 40Ni40B20 and Fe40Ni 40P14B6 alloys and the differences were analyzed from a thermodynamic point of view. The magnetic properties, M s and Hc, were studied by VSM, it was found that improved soft magnetic properties were achieved by heat treatment. A mean crystal size of 10 nm and a volume fraction of 1\% was found to be the microstructure which would yield the lowest coercivity.",

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N2 - The crystallization behavior of heat treated amorphous Fe 40Ni38B18Mo4 alloy was studied by TEM in order to investigate the suitability of this material as a soft nanostructured magnetic alloy. Significantly, the phases observed during primary and secondary crystallization were nanosized Fe-Ni solid solution and (FeNiMo)23B6, respectively. The primary crystals had an unusual irregular morphology due to the presence of molybdenum. A twinned structure was observed by nanobeam diffraction within the Fe-Ni nanocrystals. The phase transformation mechanism was compared with that of Fe 40Ni40B20 and Fe40Ni 40P14B6 alloys and the differences were analyzed from a thermodynamic point of view. The magnetic properties, M s and Hc, were studied by VSM, it was found that improved soft magnetic properties were achieved by heat treatment. A mean crystal size of 10 nm and a volume fraction of 1% was found to be the microstructure which would yield the lowest coercivity.

AB - The crystallization behavior of heat treated amorphous Fe 40Ni38B18Mo4 alloy was studied by TEM in order to investigate the suitability of this material as a soft nanostructured magnetic alloy. Significantly, the phases observed during primary and secondary crystallization were nanosized Fe-Ni solid solution and (FeNiMo)23B6, respectively. The primary crystals had an unusual irregular morphology due to the presence of molybdenum. A twinned structure was observed by nanobeam diffraction within the Fe-Ni nanocrystals. The phase transformation mechanism was compared with that of Fe 40Ni40B20 and Fe40Ni 40P14B6 alloys and the differences were analyzed from a thermodynamic point of view. The magnetic properties, M s and Hc, were studied by VSM, it was found that improved soft magnetic properties were achieved by heat treatment. A mean crystal size of 10 nm and a volume fraction of 1% was found to be the microstructure which would yield the lowest coercivity.

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Crystallization and magnetic properties of Fe₄₀Ni ₃₈B₁₈Mo₄ amorphous alloy

Abstract

ASJC Scopus Subject Areas

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