文章信息/Info

Title:

Current Progress in Half Heusler Type Alloys for Magnetic Refrigeration

作者:

劉鑫; 高建榮

(東北大學 材料電磁過程研究教育部重點實驗室，遼寧 沈陽 110004)

Author(s):

LIU Xin;  GAO Jianrong

(Northeastern University, Key Laboratory of Electromagnetic Processing of Materials, Shenyang 110004, China)

關鍵詞:

半哈斯勒型合金; 室溫磁制冷材料; 晶體結構; 磁性能

DOI:

10.7502/j.issn.1674-3962.2012.04.03

文獻標志碼:

A

摘要:

半哈斯勒型合金是近些年來受到國內(nèi)外廣泛關注的室溫磁制冷材料之一。由于其原料較為低廉，因此其工業(yè)應用前景非常看好。依據(jù)其化學成分可大致分為Co基、Ni基和Fe基三大類。合金化是調(diào)整這些合金相變溫度和磁性能的重要手段。通過元素替換、摻雜以及化學計量比的變化不僅可以使半哈斯勒合金的磁性轉變溫度降低至室溫附近，并且可以使其和結構相變溫度之間的偏差盡量減小，從而為產(chǎn)生一級磁相變和巨磁熱效應創(chuàng)造條件。預計今后幾年合金化仍將是半哈斯勒型磁制冷合金研究的重要和熱門方向之一。此外，合金的脆性和相變滯后也是值得關注的重要問題。

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�瞫toichiometric 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.