Haixu Qin, Youping Zheng, Liu Yang, Sibo Sun, Zhiyong Gao
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引用次数: 0
摘要
ni - mn - ca基材料在应力诱导马氏体相变过程中产生较大的潜热,即弹性热效应。这使得这种材料在固态制冷方面显示出巨大的潜力,固态制冷被认为是最有前途的非蒸汽压缩冷却装置之一。然而,这些材料的制冷能力仍然较低,限制了固态制冷的进一步商业化推广。在这项工作中,我们通过调整Co含量来调节NiSUB51.5/SUBMnSUB25/SUBGaSUB23/SUBCoSUB0.5的弹性热效应。结果表明,用少量Co取代Ni原子提高了合金的转变应变和加载应力/转变温度之比(dσ/dT),从而改善了合金的应力诱导转变熵变ΔSσ。因此,在NiSUB50/SUBMnSUB25/SUB- gasub23 /SUBCoSUB1/SUB合金中实现了45.0 JKgSUP-1/SUPKSUP-1/SUP的巨大ΔSσ。
Effect of Co Doping on the Elastocaloric Effect of Ni-Mn-Ga-Co Alloy
Large latent heat is produced in the stress-induced martensitic phase transition process of Ni-Mn-Ca-based materials, i.e., elastocaloric effect. That makes such materials show tremendous potential for solid-state refrigeration which is identified as one of the most promising non-vapor-compression cooling devices. However, the still low refrigeration ability of these materials restricts further commercially promoting of solid-state refrigeration. In this work, we adjusted the Co content to regulate the elastocaloric effect for the NiSUB51.5/SUBMnSUB25/SUBGaSUB23/SUBCoSUB0.5./SUB According to the results, the transformation strain and ratio of loading stress/transformation temperature (dσ/dT) were increased by replacing the Ni atoms with a little more Co, leading to an improvement of the stressinduced transformation entropy-change ΔSσ. As a result, a huge ΔSσ of 45.0 JKgSUP-1/SUPKSUP-1/SUP is achieved in NiSUB50/SUBMnSUB25/SUB-GaSUB23/SUBCoSUB1/SUB alloy.
期刊介绍:
The JOURNAL OF MAGNETICS provides a forum for the discussion of original papers covering the magnetic theory, magnetic materials and their properties, magnetic recording materials and technology, spin electronics, and measurements and applications. The journal covers research papers, review letters, and notes.