Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8000719 | Journal of Alloys and Compounds | 2014 | 5 Pages |
Abstract
Magnetocaloric effect of the Ni-Co-Mn-Al quaternary alloys was evaluated with the aim of fine-tuning the composition such that the temperature at which the maximum entropy change (|ÎSM|pk) occurs coincided with room temperature. Out of the three alloys tested (Ni41.5Co8.5Mn32Al18, Ni41Co9Mn32.5Al17.5 and Ni41Co9Mn32Al18), Ni41Co9Mn32Al18 was optimal with |ÎSM|pk of 2.1Â JÂ kgâ1Â Kâ1 at 10Â kOe observed at 300Â K as designed and the refrigeration capacity (RC) was 52Â JÂ kgâ1. Both values do compare favorably with other Heusler-type alloys, considering the relatively low material cost of the Ni-Mn-Al alloy. In addition, Ni41.5Co8.5Mn32Al18 and Ni41Co9Mn32Al18 alloys were chemically joined (using an epoxy) to attain |ÎSM|pk and RC values that nearly corresponded to the average values of the original alloys, providing a method for further tailoring the magnetic properties of the refrigerant in addition to the refinement of the composition.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Yongdeok Kim, Eun Jeong Kim, Kwangseok Choi, Won Bae Han, Hee-Soo Kim, Yoon Shon, Chong Seung Yoon,