期刊
CRYSTALS
卷 8, 期 6, 页码 -出版社
MDPI
DOI: 10.3390/cryst8060247
关键词
Ni-Mn-Sn; ferromagnetic shape memory alloys; martensitic transformation; mechanical properties; Tb doping; rare earth element
资金
- National Natural Science Foundation of China [51471064, 51301054]
- Program for Youth Academic Backbone in Heilongjiang Provincial University [1251G022]
- Scientific Research Fund of Heilongjiang Provincial Education Department [12541138]
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 degrees C for x = 0 to 364.1 degrees 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.
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