Effect of Al substitution on the magnetocaloric properties of Ni-Co-Mn-Sn multifunctional alloys

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • L. Huang
  • D.Y. Cong
  • Y. Ren
  • K.X. Wei
  • Y.D. Wang

Detail(s)

Original languageEnglish
Article number106706
Journal / PublicationIntermetallics
Volume119
Online published21 Jan 2020
Publication statusPublished - Apr 2020
Externally publishedYes

Abstract

Ni-Mn-based metamagnetic shape memory alloys have been extensively studied due to their multifunctional properties including magnetocaloric effect (MCE), magnetoresistance effect, and magnetic-field-induced strain. However, the large intrinsic thermal hysteresis of these alloys sets a limit on further development for practical applications. Here, with a few atomic percent Al substitution, we greatly reduced the thermal hysteresis and transformation temperature interval while maintaining the large magnetization difference (ΔM) between austenite and martensite. The simultaneous achievement of a large ΔM and low thermal hysteresis leads to a remarkable enhancement in MCE upon Al substitution, and a maximum magnetic entropy change of 31.6 J/kg K is achieved under a field of 5 T in Ni39Co11Mn40Sn8Al2. Furthermore, our in situ high-energy X-ray diffraction experiments show that the Ni39Co11Mn40Sn8Al2 has good geometric compatibility between austenite and martensite, which accounts for the reduced thermal hysteresis in this alloy. This study is instructive for the development of high-performance magnetocaloric materials in the metamagnetic shape memory alloys.

Citation Format(s)

Effect of Al substitution on the magnetocaloric properties of Ni-Co-Mn-Sn multifunctional alloys. / Huang, L.; Cong, D.Y.; Ren, Y.; Wei, K.X.; Wang, Y.D.

In: Intermetallics, Vol. 119, 106706, 04.2020.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review