Structure and magnetic properties of Ni 2(Mn,Co)Ga Heusler alloys rapidly solidified by melt-spinning

R. V.S. Prasad; M. Manivel Raja; G. Phanikumar

doi:10.1016/j.intermet.2012.02.012

Structure and magnetic properties of Ni ₂(Mn,Co)Ga Heusler alloys rapidly solidified by melt-spinning

R. V.S. Prasad, M. Manivel Raja, G. Phanikumar

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

4 Citations (Scopus)

Abstract

In this study microstructure and magnetic properties of cobalt substituted Ni ₂MnGa based ferromagnetic shape memory alloys (FMSA) are presented. Ni ₅₀Mn _(25-x)Co _xGa ₂₅ (x = 2, 5, 8, 11 at%) alloys were synthesized using the melt-spinning technique. Martensite, austenite and pre-martensitic tweed structures were found at room temperature for alloys containing 2, 5, 8 and 11% Co and melt-spun at two extreme wheels speeds viz., 20 m/s and 30 m/s. However, the alloy containing 5% Co melt-spun at a wheel speed of 20 m/s consists of 7 M or 14 layered Martensite phase. Magnetic properties such as saturation magnetization (Ms), martensitic transformation temperature (T _m) and Curie temperature (T _c) were measured and were found to be attractive for most of the melt-spun alloys containing higher "Co" concentrations. Upon annealing at 1273 K for 1 h, γ (gamma) phase was found to stabilize. The magnetic properties were found to correlate with the phase content of the Co substituted alloys.

Original language	English
Pages (from-to)	42-47
Number of pages	6
Journal	Intermetallics
Volume	25
DOIs	https://doi.org/10.1016/j.intermet.2012.02.012
Publication status	Published - Jun 2012
Externally published	Yes

All Science Journal Classification (ASJC) codes

Chemistry(all)
Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/j.intermet.2012.02.012

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title = "Structure and magnetic properties of Ni 2(Mn,Co)Ga Heusler alloys rapidly solidified by melt-spinning",

abstract = "In this study microstructure and magnetic properties of cobalt substituted Ni 2MnGa based ferromagnetic shape memory alloys (FMSA) are presented. Ni 50Mn (25-x)Co xGa 25 (x = 2, 5, 8, 11 at%) alloys were synthesized using the melt-spinning technique. Martensite, austenite and pre-martensitic tweed structures were found at room temperature for alloys containing 2, 5, 8 and 11% Co and melt-spun at two extreme wheels speeds viz., 20 m/s and 30 m/s. However, the alloy containing 5% Co melt-spun at a wheel speed of 20 m/s consists of 7 M or 14 layered Martensite phase. Magnetic properties such as saturation magnetization (Ms), martensitic transformation temperature (T m) and Curie temperature (T c) were measured and were found to be attractive for most of the melt-spun alloys containing higher {"}Co{"} concentrations. Upon annealing at 1273 K for 1 h, γ (gamma) phase was found to stabilize. The magnetic properties were found to correlate with the phase content of the Co substituted alloys.",

author = "Prasad, {R. V.S.} and {Manivel Raja}, M. and G. Phanikumar",

year = "2012",

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doi = "10.1016/j.intermet.2012.02.012",

language = "English",

volume = "25",

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journal = "Intermetallics",

issn = "0966-9795",

publisher = "Elsevier Limited",

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AU - Prasad, R. V.S.

AU - Manivel Raja, M.

AU - Phanikumar, G.

PY - 2012/6

Y1 - 2012/6

N2 - In this study microstructure and magnetic properties of cobalt substituted Ni 2MnGa based ferromagnetic shape memory alloys (FMSA) are presented. Ni 50Mn (25-x)Co xGa 25 (x = 2, 5, 8, 11 at%) alloys were synthesized using the melt-spinning technique. Martensite, austenite and pre-martensitic tweed structures were found at room temperature for alloys containing 2, 5, 8 and 11% Co and melt-spun at two extreme wheels speeds viz., 20 m/s and 30 m/s. However, the alloy containing 5% Co melt-spun at a wheel speed of 20 m/s consists of 7 M or 14 layered Martensite phase. Magnetic properties such as saturation magnetization (Ms), martensitic transformation temperature (T m) and Curie temperature (T c) were measured and were found to be attractive for most of the melt-spun alloys containing higher "Co" concentrations. Upon annealing at 1273 K for 1 h, γ (gamma) phase was found to stabilize. The magnetic properties were found to correlate with the phase content of the Co substituted alloys.

AB - In this study microstructure and magnetic properties of cobalt substituted Ni 2MnGa based ferromagnetic shape memory alloys (FMSA) are presented. Ni 50Mn (25-x)Co xGa 25 (x = 2, 5, 8, 11 at%) alloys were synthesized using the melt-spinning technique. Martensite, austenite and pre-martensitic tweed structures were found at room temperature for alloys containing 2, 5, 8 and 11% Co and melt-spun at two extreme wheels speeds viz., 20 m/s and 30 m/s. However, the alloy containing 5% Co melt-spun at a wheel speed of 20 m/s consists of 7 M or 14 layered Martensite phase. Magnetic properties such as saturation magnetization (Ms), martensitic transformation temperature (T m) and Curie temperature (T c) were measured and were found to be attractive for most of the melt-spun alloys containing higher "Co" concentrations. Upon annealing at 1273 K for 1 h, γ (gamma) phase was found to stabilize. The magnetic properties were found to correlate with the phase content of the Co substituted alloys.

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U2 - 10.1016/j.intermet.2012.02.012

DO - 10.1016/j.intermet.2012.02.012

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SN - 0966-9795

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JO - Intermetallics

JF - Intermetallics

ER -

Structure and magnetic properties of Ni ₂(Mn,Co)Ga Heusler alloys rapidly solidified by melt-spinning

Abstract

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