Phase equilibria and composition dependence of martensitic transformation in Ni–Mn–Ga ternary system

Yang, Shuiyuan; Wang, Cuiping; Liu, Xingjun

doi:10.1016/j.intermet.2011.12.009

Cited by 34 publications

(14 citation statements)

References 47 publications

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“…The overlay EDS map clearly shows that the outer formed layer is a Ni-Ti rich film. ,and consequently, the c/a ratio confirmed that the dominant phase was five-layer tetragonal martensite with c/a<1 [8,42,43]. Lanskaet al [8]reportedthatthec/aratio for five-layer tetragonal martensite or 10M isbetween 0.93 and 0.95.…”

Section: Microstructural Observations and Elemental Analysesmentioning

confidence: 92%

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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Section: Microstructural Observations and Elemental Analysesmentioning

confidence: 92%

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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“…An e / a value of 7.6 favored room temperature martensitic transformations [58]. The structure changed from cubic–10 M –14 M –L1 0 in accordance with an increasing e / a ratio and temperature [2], as shown in Figure 4.…”

Section: Methods Of Synthesis and Characterizationmentioning

confidence: 99%

“…The work by Yang et al in consolidating the phase equilibria of the Ni-Mn-Ga system, using the equilibrium compositions obtained from the diffusion couples and two-phase alloys, highlights critical compositions favoring near room temperature martensitic transformations as those with e / a of 7.6 [58]. A similar work on Ni-Mn-In alloy system confirmed a single β phase region existing over a composition range of 0–20 atom % In, in addition to the martensite [59].…”

Section: Methods Of Synthesis and Characterizationmentioning

confidence: 99%

Ferromagnetic Shape Memory Heusler Materials: Synthesis, Microstructure Characterization and Magnetostructural Properties

et al. 2018

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An overview of the processing, characterization and magnetostructural properties of ferromagnetic NiMnX (X = group IIIA–VA elements) Heusler alloys is presented. This type of alloy is multiferroic—exhibits more than one ferroic property—and is hence multifunctional. Examples of how different synthesis procedures influence the magnetostructural characteristics of these alloys are shown. Significant microstructural factors, such as the crystal structure, atomic ordering, volume of unit cell, grain size and others, which have a bearing on the properties, have been reviewed. An overriding factor is the composition which, through its tuning, affects the martensitic and magnetic transitions, the transformation temperatures, microstructures and, consequently, the magnetostructural effects.

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“…Generally speaking, the epitaxial growth of Ni-Mn-Ga thin films on monocrystal substrate may produce quite different microstructures, compared to those of polycrystalline bulk ingots [16][17][18][19]. Efforts have been constantly directed to reveal the microstructural features and crystallographic correlations of martensite variants in epitaxial Ni-Mn-Ga films [4,7,8,[20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Insight into variant selection of seven-layer modulated martensite in Ni–Mn–Ga thin films grown on MgO(0 0 1) substrate

Yang

Zhang

et al. 2015

Acta Materialia

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Phase equilibria and composition dependence of martensitic transformation in Ni–Mn–Ga ternary system

Cited by 34 publications

References 47 publications

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

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

Ferromagnetic Shape Memory Heusler Materials: Synthesis, Microstructure Characterization and Magnetostructural Properties

Insight into variant selection of seven-layer modulated martensite in Ni–Mn–Ga thin films grown on MgO(0 0 1) substrate

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