Magnetocaloric performance optimized by simple compression in directionally solidified Ni50Mn18Cu7Ga25 alloy
Magnetocaloric performance optimized by simple compression in directionally solidified Ni50Mn18Cu7Ga25 alloy
复制标题
DOI：
10.1016/j.jallcom.2022.166001
复制
发表时间：
2022
影响因子：
6.2
通讯作者：
Liang Zuo
中科院分区：
文献类型：
--
作者：
Naifu Zou;Dong Li;Jiajing Yang;Honglin Wang;Li Zhang;Zongbin Li;Baolin Wu;Liang Zuo
The Magnetocaloric Effect (MCE) of directionally solidified Ni 50 Mn 18 Cu 7 Ga 25 alloy was improved based on texturation and introduction of extra phase transition in this paper. Magneto-structural transition is realized in directionally solidified Ni 50 Mn 18 Cu 7 Ga 25 alloy, with a value of Adiabatic Temperature Variation (Δ T ad ) of −1.35 K under magnetic field of 1.5 T. Through simple unidirectional compression, preferred orientation is formed and intermartensitic transformation is introduced in the present alloy. Preferred orientation strengthens the coupling of magnetic and structural transition, intermartensitic transformation makes transformation path more diverse, which both enhance Δ T ad of the directionally solidified alloy. A value of Δ T ad of −2.34 K is obtained in the deformed alloy under magnetic field of 1.5 T, with a 73.3% increase compared with the initial state. Moreover, the two incompletely overlapping structural transitions broadens the temperature range of MCE from 4.3 K to 7 K. The present work provides new insight on the MCE optimization of Ni-Mn-Ga alloy by simple and short-term unidirectional compression in view of merging different strengthening mechanisms. • MCE optimized by different mechanisms: orientation and intermediate transition • Simple compression to achieve equivalent effect with thermal-stress training • Incomplete variant selection enriches transition path to increase transition scale • Partly overlapped CMMT and CMIT improve Δ T ad and widen MCE temperature range
