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Crystals 2018, 8(6), 247; https://doi.org/10.3390/cryst8060247

Influence of Doping Tb on the Mechanical Properties and Martensitic Transformation of Ni-Mn-Sn Magnetic Shape Memory Alloys

1
School of Science, Harbin University of Science and Technology, Harbin 150080, China
2
School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150080, China
*
Author to whom correspondence should be addressed.
Received: 17 May 2018 / Revised: 4 June 2018 / Accepted: 5 June 2018 / Published: 11 June 2018
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Abstract

Brittleness and low working temperature are two key factors that restrict the application of Ni-Mn-Sn alloys. Element doping is an effective means to improve performance of materials. In present paper, martensitic transformation (MT) and mechanical properties of Ni48Mn39Sn13−xTbx (x = 0, 0.5, 1, 2, and 5 at.%) alloys are investigated. It is found that the Tb addition refines significantly the grains and causes the formation of a Tb-rich phase. All the samples undergo the martensitic transformation from parent phase to martensite. And the martensitic transformation characteristic temperatures increase remarkably from −60.7 °C for x = 0 to 364.1 °C for x = 5. The appropriate amount of Tb addition in Ni48Mn39Sn13−xTbx (x = 0, 0.5, 1, 2, and 5 at.%) alloys significantly enhances the compressive strength and improves the ductility, which can be ascribed to the grain refinement. The compressive stress of 571.8 MPa and strain 22.0% are obtained in the Ni48Mn39Sn11Tb2 alloy. Then the mechanical properties decrease with the further increased Tb content. Simultaneous improving of martensitic transformation temperature and mechanical properties in Ni-Mn-Sn magnetic alloy are achieved by Tb doping. View Full-Text
Keywords: Ni-Mn-Sn; ferromagnetic shape memory alloys; martensitic transformation; mechanical properties; Tb doping; rare earth element Ni-Mn-Sn; ferromagnetic shape memory alloys; martensitic transformation; mechanical properties; Tb doping; rare earth element
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Tian, X.; Zhang, K.; Tan, C.; Guo, E. Influence of Doping Tb on the Mechanical Properties and Martensitic Transformation of Ni-Mn-Sn Magnetic Shape Memory Alloys. Crystals 2018, 8, 247.

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