2015/06/22 by Z. Li, Li, Z., Kun Xu +9
Engineering · Materials Science · #FOS: Physical sciences #High Entropy Alloys Studies #Magnetic and transport properties of perovskites and related materials #Materials Science (cond-mat.mtrl-sci) #Shape Memory Alloy Transformations
paper · pdf · doi:10.48550/arxiv.1506.06517
openalex publication_date 2015/06/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In the present work, two successive magneto-structural transformations (MSTs) consisting of martensitic and intermartensitic transitions have been reported in polycrystalline Ni55.8Mn18.1Ga26.1 Heusler alloy. Benefiting from the additional latent heat contributed from intermediate phase, this alloy exhibits a large transition entropy change ΔStr with the value of ~28 J/kg K. Moreover, the magnetocaloric effect (MCE) has been also evaluated in terms of Maxwell relation. For the magnetic field change of 3 T, it is found that the calculated value of refrigeration capacity for Ni55.8Mn18.1Ga26.1 attains to ~72 J/kg around room temperature, which significantly surpasses those obtained in many Ni-Mn based Heusler alloys. The mechanism underlying the enhanced MCE is believed to be responsible for these multiple transformations, which can sustain the pronounced isothermal entropy change ΔST over a relatively wide temperature interval.