Abstract
Ni-Mn-In-based magnetic shape memory alloys have promising applications in numerous state-of-the-art technologies, such as solid-state refrigeration and smart sensing, resulting from the magnetic field-induced inverse martensitic transformation. This paper aims at presenting a comprehensive review of the recent research progress of Ni-Mn-In-based alloys. First, the crystallographic characterization of these compounds that strongly affects functional behaviors, including the crystal structure of modulated martensite, the self-organization of martensite variants and the strain path during martensitic transformation, are reviewed. Second, the current research progress in functional behaviors, including magnetic shape memory, magnetocaloric and elastocaloric effects, are summarized. Finally, the main bottlenecks hindering the technical development and some possible solutions to overcome these difficulties are discussed. This review is expected to provide some useful insights for the design of novel advanced magnetic shape memory alloys.
Highlights
In 1996, a large magnetic-field-induced strain, i.e., 0.2% under a magnetic field of 0.8 T realized by the rearrangement of martensite variants driven by the magnetocrystalline anisotropy energy, was first reported in the stoichiometric Heusler-type Ni2MnGa alloys by K
The progress of metamagnetic shape memory effect was summarized from two aspects of NiCoMnIn and other NiMnIn-based alloys
The magnetocaloric effect was reviewed in the focus of increasing isothermal magnetic entropy change, reducing thermal/magnetism hysteresis, and expanding the operating temperature window
Summary
In 1996, a large magnetic-field-induced strain, i.e., 0.2% under a magnetic field of 0.8 T realized by the rearrangement of martensite variants driven by the magnetocrystalline anisotropy energy, was first reported in the stoichiometric Heusler-type Ni2MnGa alloys by K. The magnetic field should stabilize the strong magnetic austenite phase This feature of the NiMnIn alloy provides an extra stimulus, apart from thermal and mechanical fields, to drive the inverse martensitic transformation. To be specific, when a magnetic field is applied to the martensite of the NiMnIn alloy, the sample tends to transform to the austenite state, i.e., the magneticfield-induced inverse martensite transformation, under the driving force of the Zeeman energy difference μ0HΔM of these two phases. Since the total entropy and the electric resistance of austenite and martensite have great differences, when an external magnetic field is applied, a huge change of total entropy (termed as the magnetocaloric effect) and electric resistance (termed as the magnetoresistance effect) may occur during the magnetic-field-induced inverse martensite transformation. The main bottlenecks hindering the technical development and some possible solutions for overcoming these difficulties are discussed
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