Tailored martensitic transformation and enhanced magnetocaloric effect in all-d-metal Ni35Co15Mn33Fe2Ti15 alloy ribbons |
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| Affiliation: | 1.Key Laboratory of Novel Materials for Sensor of Zhejiang Province, College of Materials&Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China;2.Faculty of Materials and Manufacturing, Key Laboratory of Advanced Functional Materials, Ministry of Education of China, Beijing University of Technology, Beijing 100124, China |
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| Abstract: | The crystal structure, martensitic transformation and magnetocaloric effect have been studied in all-$d$-metal Ni$_{35}$Co$_{15}$Mn$_{33}$Fe$_{2}$Ti$_{15}$ alloy 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) Å, 5.898(4) Å, and 5.898(6) Å, respectively. With the increase of wheel speed, the martensitic transformation temperature decreases from 230 K to 210 K, the Curie temperature increases slightly from 371 K to 378 K. At the same time, magnetic entropy change ($Delta S_{rm m}$) is also enhanced, as well as refrigeration capacity ($RC$). The maximum $Delta S_{rm m}$ of 15.6(39.7) J/kg$cdot$K and $RC$ of 85.5 (212.7) J/kg under $Delta H = 20$ (50) kOe (1 ${rm Oe}=79.5775$ A$cdot$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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| Keywords: | martensitic transformation magnetocaloric effect wheel speeds all-d-metal Heusler ribbons |
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