Martensitic Transformation and Magnetic Properties of Ni-Mn Quinary Heusler Alloy

S., Sandeep Nambiar; Murthy, B. Rama; Sharma, Sathyashankara; Prasanna, A. A.

doi:10.3390/jcs7010001

Cited by 2 publications

(1 citation statement)

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“…Scientific development on Heusler alloys has shown the great versatility that this new class of compounds offers. Alloys in this category have attracted attention due to their important characteristics such as magnetic shape memory effect, magnetocaloric effect, and large magnetoresistance effect [1][2][3] . During the past two decades, intensive attention has been devoted to these multifunctional alloys due to their great potential for applications in magnetic sensing, actuation and magnetic refrigeration 4 .…”

Section: Introductionmentioning

confidence: 99%

Structural, Thermal and Magnetic Characterization of Polycrystalline Ni-Mn-Ga Ferromagnetic Shape Memory Alloys

Batista,

Quirino,

Souto

et al. 2023

Mat. Res.

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Shape memory alloys (SMA) are now widely studied in academia and have increasing usage in industry, as they allow efficient performance compared to mechanic actuators with reduced dimensions and the possibility of sensing temperature through the material itself. A subclass of the SMAs are the alloys with magnetic shape memory, still little explored as intelligent materials in Brazil. They combine the best properties of SMAs and common magnetostrictive materials. The magnetic shape memory alloys (MSMA) can be activated not only by the presence of a thermal stimulus, but also by the presence of an applied magnetic field. In this research, the polycrystalline magnetic shape memory alloys Ni 51.3 Mn 24 Ga 24.7 and Ni 54 Mn 21 Ga 25 were manufactured and characterized. Differential scanning calorimetry, X-Ray diffraction, energy dispersive X-ray spectrometry and scanning electron microscopy analyzes were performed to thermoanalytically and crystallographically characterize the alloys. Magnetic characterizations were also performed using Magnetic force microscopy. The results of the characterizations showed that the production process and the heat treatment were satisfactory for the fabrication of the ferromagnetic polycrystalline alloys. Besides that, the compositions Ni 51.3 Mn 24 Ga 24.7 and Ni 54 Mn 21 Ga 25 , presented austenitic and martensitic 5M structures, respectively, at room temperature and it was possible to observe the alignment of the magnetic domains after magnetization.

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