Effect of Co addition on the martensitic transformation and magnetocaloric effect of Ni–Mn–Al ferromagnetic shape memory alloys |
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| Affiliation: | 1. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, People''s Republic of China;2. Department of Physics, Taiyuan University of Science and Technology, Taiyuan 030024, People''s Republic of China;3. National Laboratory of Solid State Microstructures and Key Laboratory of Nanomaterials for Jiang Su Province, Nanjing University, Nanjing 210093, People''s Republic of China;1. International Laboratory of High Magnetic Fields and Low Temperatures, Wroclaw, 53-421, Poland;2. Department of Physics, Southern Illinois University, Carbondale, IL, 62901, USA;3. Faculty of Physics, Lomonosov Moscow State University, Vorob''evy Gory, 11999I, Moscow, Russia;4. Lappeenranta University of Technology, 53851, Finland;5. Dpto. de Física de Materiales, Fac. Químicas, UPV/EHU, 20018, San Sebastian, Spain;6. IKERBASQUE, Basque Foundation for Science, 48011, Bilbao, Spain;7. Department of Physics & Astronomy, Louisiana State University, Baton Rouge, LA, 70803, USA;1. Department of Physics and Astronomy, Texas A&M University, College Station, 77843, TX, USA;2. Department of Mechanical Engineering, Texas A&M University, College Station, 77843, TX, USA;3. Department of Materials Science and Engineering, Texas A&M University, College Station, 77843, TX, USA;4. School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai, 200240, China;1. Department of Physics, Chungbuk National University, Cheongju 28644, South Korea;2. Institute of Materials Science, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Hanoi, Viet Nam;3. Center for Non-Destructive Evaluation, Atomic Energy Institute of Vietnam, Thanh Xuan, Hanoi, Viet Nam;4. Department of Physics, Hankuk University of Foreign Studies, Yongin 449-791, South Korea |
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| Abstract: | A series of Ni50?xCoxMn32Al18 (x = 3, 4, 5, 6, 7, and 8) alloys were prepared by the arc melting method. The martensitic transformation (MT) shifts to a lower temperature with increasing Co concentration and can be tuned to occur from a ferromagnetic austenite to a weak-magnetic martensite in the range of 6 ≤ x ≤ 8. The field-induced metamagnetic behavior was realized in Ni42Co8Mn32Al18 sample in which a large magnetic entropy change of 7.7 J/kg K and an effective refrigerant capacity value of 112 J/kg were obtained under the field of 60 kOe. The large magnetocaloric effect and adjustable MT temperature suggest that Ni–Co–Mn–Al alloys should have promising potential as magnetic refrigerants. |
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| Keywords: | A Magnetic intermetallics B Magnetic properties B Martensitic transformation |
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