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

Khan, Riaz Ahamed Ahamed; Ghomashchi, Reza; Xie, Zonghan; Chen, Lei

doi:10.3390/ma11060988

Cited by 26 publications

(15 citation statements)

References 177 publications

(265 reference statements)

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“…For both cases, the number of electrons available for this interaction changes. This unique feature is quantitatively represented by the valence electron concentration per atom e / a , expressed as where N X , N Y , and N Z are the electronic valence numbers of each atomic element and f X , f Y , and f Z stand for their corresponding atomic weights. For many conventional X 2 MnZ Heusler compounds, we observe a linear dependence of T M as a function of the e / a ratio, where the angular coefficient is different for each Z atom, as illustrated in Figure for the Ni 2 Mn 2– x Z x (left side) and Mn 2 Ni 2– x Z x (right side) series.…”

Section: Conventional Heusler Alloysmentioning

confidence: 99%

All-d-Metal Full Heusler Alloys: A Novel Class of Functional Materials

Paula

Reis

2021

Chem. Mater.

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Full Heusler alloys display a wide range of physical phenomena with potential applications in different areas. However, researchers still struggle to overcome many limiting factors to optimize their functional properties. Particularly, the poor mechanical properties of the X 2 YZ series undermine its exploration as shape memory alloys and solid-state cooling materials. Recently, the suppression of p−d covalent hybridization characteristic of these alloys came up as a promising approach, resulting in novel compounds displaying enhanced mechanical properties and large caloric effects. These materials have been named all-d-metal Heusler alloys. We discuss this advanced functional behavior in light of the recent theoretical and experimental findings. Moreover, we point out some open questions suggesting different pathways to guide further research on this topic.

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Section: Conventional Heusler Alloysmentioning

confidence: 99%

All-d-Metal Full Heusler Alloys: A Novel Class of Functional Materials

Paula

Reis

2021

Chem. Mater.

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“…The Heusler alloys are the phases of A 2 BC stoichiometry, which can exhibit ferromagnetic behavior, even if they do not contain any ferromagnetic element. Many of these phases, such as Cu 2 MnAl [ 24 ] or recently described Mn 2 FeSi and Mn 2 FeAl phases [ 25 , 26 ], are the manganese-containing ones.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Properties of Mn-Based Alloys Obtained by Aluminothermic Reduction of Deep-Sea Nodules

et al. 2021

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Deep-sea manganese nodules are polymetallic oxidic ores that can be found on a seabed. Aluminothermic reduction is one of the possibilities of manganese nodules processing. This process obtains the polymetallic alloy with a high content of Mn and a varying content of Al, depending on the ratio between aluminum and nodules. The corrosion behaviors of three experimental Mn-based alloys produced by aluminothermic reduction with a content of Mn > 50 wt % were studied. The electrochemical testing in potable water and model seawater was used to explain the corrosion mechanism of Mn-based alloys. The results showed that the corrosion rate of experimental Mn-based alloy decreases with the increase in aluminum content in both potable water and model seawater. It was observed that the uniform corrosion of experimental Mn-based alloys is changed with an increase in aluminum content in alloy to localized corrosion, which was caused by microcells in an environment of model seawater. In contrast, the formation of a semi-protective layer of corrosion products was observed on the surface of Mn-based alloys with a higher content of aluminum in potable water. Moreover, the pitting corrosion of tested Mn-based alloys was observed neither in potable water nor in model seawater.

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“…Ferromagnetic shape memory alloys (FSMA) are recently one of the most extensively studied group of modern smart materials [ 1 , 2 , 3 ]. Among them, NiMnGa-based Heusler compounds stand out as the most complex alloys due to their unique magnetomechanical properties, such as magnetic field induced strains [ 4 , 5 , 6 ], pseudoelasticity/superelasticity [ 7 , 8 , 9 ], magnetoresistance [ 10 , 11 ] or magneto- and mechanocaloric effects [ 12 , 13 , 14 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

Temperature Dependence of Anisotropy in Ti and Gd Doped NiMnGa-Based Multifunctional Ferromagnetic Shape Memory Alloys

2020

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The temperature dependence of magnetocrystalline anisotropy was investigated in detail for the polycrystalline Ni50Mn25Ga25, Ni50Mn25Ga20Ti5 and Ni50Mn25Ga20Gd5 ferromagnetic shape memory alloys in the temperature range of 50–400 K. The effective anisotropy constant was estimated from a series of high field magnetization curves based on the fitting procedure according to the law of approach to magnetic saturation. The low temperature martensitic phase was found to have a significantly higher anisotropy energy in comparison to a high temperature austenitic phase, which was observed through a sudden, distinct drop of anisotropy energy. The calculated values of the effective anisotropy constant were comparable to the results published by other authors. Moreover, the strong influence of chemical composition on the first-order phase transition and the second-order ferromagnetic to the paramagnetic transition was revealed. Finally, the strong coupling between the temperature dependence of the coercive field and the temperature dependence of magnetocrystalline anisotropy was also shown and discussed in the present study.

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

Cited by 26 publications

References 177 publications

All-d-Metal Full Heusler Alloys: A Novel Class of Functional Materials

All-d-Metal Full Heusler Alloys: A Novel Class of Functional Materials

Corrosion Properties of Mn-Based Alloys Obtained by Aluminothermic Reduction of Deep-Sea Nodules

Temperature Dependence of Anisotropy in Ti and Gd Doped NiMnGa-Based Multifunctional Ferromagnetic Shape Memory Alloys

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