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Tailored martensitic transformation and enhanced magnetocaloric effect in all-d-metal Ni_(35)Co_(15)Mn_(33)Fe_2Ti_(15) alloy ribbons

李勇  覃亮  张红国  李领伟  
【摘要】:The crystal structure, martensitic transformation and magnetocaloric effect have been studied in all-d-metal Ni35Co15Mn33Fe2Ti15alloy ribbons with different wheel speeds(15 m/s(S15), 30 m/s(S30), and 45 m/s(S45)). All three ribbons crystalize in B2-ordered structure at room temperature with crystal constants of 5.893(2) A, 5.898(4) A, and5.898(6) A, respectively. With the increase of wheel speed, the martensitic transformation temperature decreases from230 K to 210 K, the Curie temperature increases slightly from 371 K to 378 K. At the same time, magnetic entropy change(?Sm) is also enhanced, as well as refrigeration capacity(RC). The maximum ?Sm of 15.6(39.7) J/kg·K and RC of85.5(212.7) J/kg under ?H = 20(50) k Oe(1 Oe = 79.5775 A·m-1) appear in S45. The results indicate that the ribbons could be the candidate for solid-state magnetic refrigeration materials.

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