半哈斯勒型磁制冷合金的研究进展-中国材料进展

文章信息/Info

Title:: Current Progress in Half Heusler Type Alloys for Magnetic Refrigeration

Author(s):: LIU Xin; GAO Jianrong; (Northeastern University, Key Laboratory of Electromagnetic Processing of Materials, Shenyang 110004, China)

摘要:: 半哈斯勒型合金是近些年来受到国内外广泛关注的室温磁制冷材料之一。由于其原料较为低廉，因此其工业应用前景非常看好。依据其化学成分可大致分为Co基、Ni基和Fe基三大类。合金化是调整这些合金相变温度和磁性能的重要手段。通过元素替换、掺杂以及化学计量比的变化不仅可以使半哈斯勒合金的磁性转变温度降低至室温附近，并且可以使其和结构相变温度之间的偏差尽量减小，从而为产生一级磁相变和巨磁热效应创造条件。预计今后几年合金化仍将是半哈斯勒型磁制冷合金研究的重要和热门方向之一。此外，合金的脆性和相变滞后也是值得关注的重要问题。

Abstract:: Half Heusler alloys have attracted much attention in recent years as a candidate material for room temperature magnetic refrigeration. They have a promising prospect for industrial applications due to low costs of raw materials. In terms of their chemical compositions, they can be classified into three groups: Co based, Ni based and Fe based alloys. Alloying is an important method for adjusting their phase transition temperatures and magnetic properties. By using substitutional atoms, interstitial alloys and nonstoichiometric compositions, the magnetic phase transition temperatures can be shifted to room temperature, and their differences from the structural transition temperatures can also be minimized, which are required for the generation of a first order magnetic transition and therefore a large magnetocaloric effect. It is expected that alloying will continue to be an important research topics in the future study of half Heusler alloys for room temperature magnetic refrigeration. Meanwhile, attention should be paid to the issues of brittleness and hysteresis occurring during phase transitions.