Microstructures and magnetic properties of rapidly solidified Ni54 Fe27-2x Ga19+2x ferromagnetic Heusler alloys

S. Aich, S. Das, I. A. Al-Omari, P. Alagarsamy, S. G. Chowdhury, M. Chakraborty, J. E. Shield, D. J. Sellmyer

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Abstract

Rapidly solidified Ni54 Fe27-2x Ga19+2x (x=0, 1, 2, 3, and 4) ferromagnetic shape memory alloys were made by melt-spinning with variation of Fe and Ga contents to report on the martensitic phase transformation, microstructures, and magnetic properties. Rapid solidification produced pure L 21 phase by preventing the formation of γ -phase. To study the effect of heat treatment on the phase transitions, microstructures, and the magnetic properties, the melt-spun ribbons were partly heat treated at different temperatures of 800, 900, 1000, 1100, and 1200 K with holding times of 5, 10, and 15 min followed by either water quenching or air cooling. The microstructures of the as-spun ribbons as revealed by electron microscopy studies exhibited a gradual transition from cellular to dendritic structure with increasing Ga concentration and with the presence of some internal martensitic twin bands at higher Ga content. The ribbons exhibited very low coercivity with high saturation magnetization, as high as ∼87 emu/g (decreasing with Ga concentration). The above-ambient Curie temperature (TC) and the subambient martensitic transition temperature (Tm) were observed to be ∼320 and ∼195 K, respectively. At higher heat treatment temperatures formation of ductile γ phases was observed.

Original languageEnglish
Article number07A943
JournalJournal of Applied Physics
Volume105
Issue number7
DOIs
Publication statusPublished - 2009

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ribbons
magnetic properties
microstructure
quenching (cooling)
heat treatment
air cooling
rapid solidification
melt spinning
shape memory alloys
ambient temperature
coercivity
phase transformations
Curie temperature
electron microscopy
transition temperature
saturation
heat
magnetization
temperature
water

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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Microstructures and magnetic properties of rapidly solidified Ni54 Fe27-2x Ga19+2x ferromagnetic Heusler alloys. / Aich, S.; Das, S.; Al-Omari, I. A.; Alagarsamy, P.; Chowdhury, S. G.; Chakraborty, M.; Shield, J. E.; Sellmyer, D. J.

In: Journal of Applied Physics, Vol. 105, No. 7, 07A943, 2009.

Research output: Contribution to journalArticle

Aich, S, Das, S, Al-Omari, IA, Alagarsamy, P, Chowdhury, SG, Chakraborty, M, Shield, JE & Sellmyer, DJ 2009, 'Microstructures and magnetic properties of rapidly solidified Ni54 Fe27-2x Ga19+2x ferromagnetic Heusler alloys', Journal of Applied Physics, vol. 105, no. 7, 07A943. https://doi.org/10.1063/1.3073839
Aich, S. ; Das, S. ; Al-Omari, I. A. ; Alagarsamy, P. ; Chowdhury, S. G. ; Chakraborty, M. ; Shield, J. E. ; Sellmyer, D. J. / Microstructures and magnetic properties of rapidly solidified Ni54 Fe27-2x Ga19+2x ferromagnetic Heusler alloys. In: Journal of Applied Physics. 2009 ; Vol. 105, No. 7.
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