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

Journal Article · · Intermetallics
 [1];  [2];  [3];  [1];  [2]
  1. Hunan Inst. of Engineering, Xiangtan (China)
  2. Univ. of Science and Technology, Beijing (China)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)

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.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; National Natural Science Foundation of China (NSFC); Provincial Natural Science Foundation of Hunan; Hunan Province Education Department; State Key Laboratory for Advanced Metals and Materials
Grant/Contract Number:
AC02-06CH11357; 51701070; 51527801; 2019JJ50101; 17A046; 2016-T01
OSTI ID:
1756084
Alternate ID(s):
OSTI ID: 1778537
Journal Information:
Intermetallics, Vol. 119; ISSN 0966-9795
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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