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Open AccessArticle

Designing a New Ni-Mn-Sn Ferromagnetic Shape Memory Alloy with Excellent Performance by Cu Addition

1
School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150080, China
2
School of Science, Harbin University of Science and Technology, Harbin 150080, China
3
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
*
Author to whom correspondence should be addressed.
Metals 2018, 8(3), 152; https://doi.org/10.3390/met8030152
Received: 3 February 2018 / Revised: 23 February 2018 / Accepted: 24 February 2018 / Published: 28 February 2018
Both magnetic-field-induced reverse martensitic transformation (MFIRMT) and a high working temperature are crucial for the application of Ni-Mn-Sn magnetic shape memory alloys. Here, by first-principles calculations, we demonstrate that the substitution of Cu for Sn is effective not only in enhancing the MFIRMT but also in increasing martensitic transformation, which is advantageous for its application. Large magnetization difference (ΔM) in Ni-Mn-Sn alloy is achieved by Cu doping, which arises from the enhancement of magnetization of austenite due to the change of Mn-Mn interaction from anti-ferromagnetism to ferromagnetism. This directly leads to the enhancement of MFIRMT. Meanwhile, the martensitic transformation shifts to higher temperature, owing to the energy difference between the austenite L21 structure and the tetragonal martensite L10 structure increases by Cu doping. The results provide the theoretical data and the direction for developing a high temperature magnetic-field-induced shape memory alloy with large ΔM in the Ni-Mn-Sn Heusler alloy system. View Full-Text
Keywords: Ni-Mn-Sn; ferromagnetic shape memory alloys; martensitic transformation; magnetic properties; first-principle calculation; Cu addition Ni-Mn-Sn; ferromagnetic shape memory alloys; martensitic transformation; magnetic properties; first-principle calculation; Cu addition
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MDPI and ACS Style

Zhang, K.; Tian, X.; Tan, C.; Guo, E.; Zhao, W.; Cai, W. Designing a New Ni-Mn-Sn Ferromagnetic Shape Memory Alloy with Excellent Performance by Cu Addition. Metals 2018, 8, 152.

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