Giant and reversible room-temperature magnetocaloric effect in Ti-doped Ni-Co-Mn-Sn magnetic shape memory alloys
Giant and reversible room-temperature magnetocaloric effect in Ti-doped Ni-Co-Mn-Sn magnetic shape memory alloys
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Ti掺杂Ni-Co-Mn-Sn磁性形状记忆合金中巨大的可逆室温磁热效应
DOI：
10.1016/j.actamat.2017.06.010
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发表时间：
2017-08
期刊：
影响因子：
9.4
通讯作者：
Wang Y D
中科院分区：
文献类型：
--
作者：
Qu Y H;Cong D Y;Sun X M;Nie Z H;Gui W Y;Li R G;Ren Y;Wang Y D
磁热材料用于磁制冷的实际应用不仅要求磁热效应的大小，而且要求磁热效应的可逆性和室温工作温度。然而，由于磁结构转变参数的相互依赖性，在Heusler型Ni-（Co）-Mn-X（X = In，Sn，Sb，Ga）磁性形状记忆合金中同时满足这些要求是一个复杂的问题，该合金是磁热材料的有希望的候选者。在此，通过与Ti合金化对Ni 42-xTixCo 9 Mn 39 Sn 10合金的磁结构相变参数的协同调控，实现了大的可逆室温磁热效应。通过添加适量的Ti，使马氏体相变温度降至室温，相变温度对磁场变化的敏感性大大提高，相变熵变仍保持较大值，而热滞和相变间隔仅略有增加。因此，诱导完全和可逆转化所需的场显著降低。结果表明，Ni 41 Ti 1Co 9 Mn 39 Sn 10合金在5 T下获得了18.7 J kg− 1 K − 1的大的可逆室温磁熵变Δ Sm。这是首次报道Ni-Mn-Sn基Heusler合金的可逆ΔSmin，其ΔSmwe是迄今为止Ni-Mn基Heusler合金在5 T下可逆Δ Smin的最高值。此外，Ni 41 Ti 1Co 9 Mn 39 Sn 10合金在热循环过程中表现出良好的压缩性能和稳定的马氏体相变，有利于潜在的磁热应用。该研究对开发高性能的室温磁制冷磁热材料具有指导意义。
The practical applications of magnetocaloric materials for magnetic refrigeration require not only large magnitude but also reversibility, as well as room-temperature operating temperature, of the magnetocaloric effect. However, it is a complex problem to simultaneously meet these demands in the Heusler-type Ni-(Co)-Mn-X (X = In, Sn, Sb, Ga) magnetic shape memory alloys which are a promising candidate for magnetocaloric materials, owing to the interdependence of magnetostructural transformation parameters. Here, through synergic tuning of magnetostructural transformation parameters via alloying with Ti in Ni42-xTixCo9Mn39Sn10alloys, we achieved a large reversible room-temperature magnetocaloric effect. By alloying with a proper amount of Ti, the martensitic transformation temperature was brought down to room temperature and the sensitivity of transformation temperature to magnetic field change was greatly enhanced with the transformation entropy change still remaining a large value, while the thermal hysteresis and the transformation interval only slightly increased. Thus, the field required to induce the complete and reversible transformation was significantly reduced. As a result, a large reversible room-temperature magnetic entropy change ΔSmof 18.7 J kg−1K−1under 5 T was achieved in the Ni41Ti1Co9Mn39Sn10alloy. This is the first report on reversible ΔSmin Ni-Mn-Sn-based Heusler alloys and the ΔSmwe achieved represents the highest reversible ΔSmunder 5 T reported heretofore in Ni-Mn-based Heusler alloys. Furthermore, the Ni41Ti1Co9Mn39Sn10alloy shows good compressive properties and stable martensitic transformation during thermal cycling, beneficial for potential magnetocaloric applications. This study is instructive for the development of high-performance magnetocaloric materials for room-temperature magnetic refrigeration.
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期刊：
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影响因子：
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