Journal
INTERMETALLICS
Volume 112, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.intermet.2019.106529
Keywords
Ferromagnetic shape memory alloys; Martensitic transformation; Gamma phase; Elastocaloric effect; Mechanical properties; Ni-Fe-Mn-Al
Categories
Funding
- National Natural Science Foundation of China [51401140]
- Natural Science Foundation of Shanxi Province, China [201801D121100]
- Program for the Outstanding Innovative Teams of Higher Learning Institutions of Shanxi (OIT)
- Scientific and Technologial Innovation Programs of Higher Education Institutions in Shanxi (STIP) [201802033]
- Collaborative Innovation Center for Shanxi Advanced Permanent Magnetic Materials and Technology [2016-06]
- Fund Program for the Scientific Activities of Selected Returned Overseas Professionals in Shanxi Province
- Shanxi Scholarship Council of China [2016-092]
- Proposal of Open Project of Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education Northeastern University [ATM20170003]
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The influence of Fe substitution for Ni on mechanical properties and elastocaloric effect (eCE) in Ni50-xFexMn32Al18 (x = 2, 3 and 4) ferromagnetic shape memory alloys (FSMAs) has been investigated. These alloys undergo a first-order martensitic transformation from B-2 (austenite) to Ll(0) (martensite) on the cooling process. As the Fe content increases, the martensitic transformation temperature shifts toward lower temperature region, and the amount of gamma phase increases gradually in Ni50-xFexMn32Al18 (x = 2, 3 and 4) alloys. Moreover, the maximum compressive strength (1147 MPa) is obtained in Ni46Fe4Mn32Al18 alloy. The application and removal stress of 300 MPa can produce a large adiabatic temperature change of about 5.1 K and no significant degradation of eCE after 30 stress cycles in Ni46Fe4Mn32Al18 alloy. These results show that Ni50-xFexMn32Al18 alloys would be the promising candidates for new multifunctional materials.
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