Effect of Mn incorporation for Ni on the properties of melt spun off-stoichiometric compositions of NiMnGa alloys

Panda, A K; Singh, Sukhbir; Roy, Rajat; Ghosh, Mainak; Mitra, A.

doi:10.1016/j.jmmm.2010.12.035

Cited by 15 publications

(3 citation statements)

References 33 publications

(41 reference statements)

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“…[11] Compositional variation of martensite structures and phase transitions has been studied, by XRD and optical microscopy, by Jiang et al [12] for arc-melted Ni 2 MnGa and replacing Ga by Mn atoms where they observed 5 M, 7 M, and nonmodulated martensites. Similar studies have been performed by Panda et al [13] using XRD and some transmission electron microscopy (TEM) with Mn substituting for Ni for melt spun ribbons of NiMnGa alloys. Empirical relationship among martensite transformation temperature, Curie temperature, saturation magnetization, valence electron concentration (e/a), composition etc., for NiMnGa alloys has been suggested by Jin et al [14] via polynomial fitting of data.…”

Section: Introductionsupporting

confidence: 63%

“…The martensitic lamellas appear to be plate-or spear-like in shape, which is typical for shape memory alloys. [13,17] However, typical width of martensitic lamellas for the Ni 2.14 Mn 0.86 Ga alloy appear to be smaller than that for other alloys as shown in Figure 4, with a higher density of martensitic lamellas within each grain. Similar observations have also been reported for NM and 7 M martensites with different compositions than this study.…”

Section: Resultsmentioning

confidence: 87%

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Microstructural and Crystallographic Characterization of Ni2+x Mn1−x Ga Alloys (x = 0.14, 0.16, 0.19, 0.22, and 0.24) by Transmission Electron Microscopy

Zhou

Giri²,

Cho

et al. 2014

Metallurgical and Materials Transactions E

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Heusler alloy, Ni 2 MnGa, and its off-stoichiometric solid solutions have great potential applications in refrigeration technology due to their magnetocaloric effect (MCE), which can be strongly influenced by martensitic phase transformations and related crystallography. In this study, five polycrystalline alloys with nominal compositions of Ni 2+x Mn 1Àx Ga (x = 0.14, 0.16, 0.19, 0.22, and 0.24) were prepared by triple arc-melting and characterized by differential scanning calorimetry for measurement of martensitic transformation temperature, optical microscopy for microstructural observation, and X-ray diffraction and transmission electron microscopy (TEM) for detailed microstructural and crystallographic analyses. Martensitic transformation temperature was closest to room temperature for the Ni 2.14 Mn 0.86 Ga (x = 0.14) alloy, and the transformation temperature increased with an increase in valence electron concentration (e/a). For the Ni 2.14 Mn 0.86 Ga (x = 0.14) alloy, extensive TEM analyses confirmed the presence of modulated 7 M martensites, however, only non-modulated (NM) martensites were observed in all other alloys including Ni 2.16 Mn 0.84 Ga (x = 0.16) alloy which exhibited a large MCE. Martensites examined by high resolution TEM were highly twinned in nature, and formed nano-scale twins within twinned microstructures.

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Section: Introductionsupporting

confidence: 63%

Section: Resultsmentioning

confidence: 87%

Microstructural and Crystallographic Characterization of Ni2+x Mn1−x Ga Alloys (x = 0.14, 0.16, 0.19, 0.22, and 0.24) by Transmission Electron Microscopy

Zhou

Giri²,

Cho

et al. 2014

Metallurgical and Materials Transactions E

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“…The mechanism of MFIS is based on the reordering of crystallographic domains in an applied magnetic field which lowers magnetization energy [8,9]. Richard et al [10] extensively studied off-stoichiometric Ni 2 MnGa alloys.As room-temperature single crystals, these display large magnetoplastic strains (up to 10%) when optimally oriented to the magnetic field [11,12].…”

Section: Introductionmentioning

confidence: 99%

Microstructural evolution and magnetic properties of binder jet additive manufactured Ni-Mn-Ga magnetic shape memory alloy foam

et al. 2017

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This study investigatedmicrostructural evolution, phase transformation and magnetic behavior of additively manufactured magnetic shape memory alloy foam. Pre-alloyed angular Ni-Mn-Ga ball-milled powderwasbinder jet printed and sintered at 1020 °C for 4 h in both vacuum and argon atmospheres. Porosity of the manufactured foams was studied using micro-computed x-ray tomography and it was found that the relative density of the sintered parts wasabout50-60%. In the printed sample that was sintered in argon, electron microscopy with elemental analysis showed no compositional gradient. X-ray diffraction indicated that 10M modulated martensite was present in the pre-alloyed powder as well asthe sample sintered in argon. Differential scanning calorimetry and thermomagnetic results showed that martensitic transformation of the sample sintered in argon wasat 34 °C, while barely detectable in the sample sintered in vacuum.Saturation magnetization of the printed sample sintered in argon atmosphere was around 68.4Am 2 /kg.Production of a magnetic shape memory alloy by printing would enablecomplexshaped elements for demanding applications, and intentionally including porosity could allow these polycrystals to exhibit the magnetic shape memory effect. Therefore, a facile method for sintering of Ni-Mn-Ga printed parts has been presented for the first time.

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Sintering regimes and resulting microstructure and properties of binder jet 3D printed Ni-Mn-Ga magnetic shape memory alloys

et al. 2018

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Effect of Mn incorporation for Ni on the properties of melt spun off-stoichiometric compositions of NiMnGa alloys

Cited by 15 publications

References 33 publications

Microstructural and Crystallographic Characterization of Ni2+x Mn1−x Ga Alloys (x = 0.14, 0.16, 0.19, 0.22, and 0.24) by Transmission Electron Microscopy

Microstructural and Crystallographic Characterization of Ni2+x Mn1−x Ga Alloys (x = 0.14, 0.16, 0.19, 0.22, and 0.24) by Transmission Electron Microscopy

Microstructural evolution and magnetic properties of binder jet additive manufactured Ni-Mn-Ga magnetic shape memory alloy foam

Sintering regimes and resulting microstructure and properties of binder jet 3D printed Ni-Mn-Ga magnetic shape memory alloys

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