Journal of Northeastern University Natural Science ›› 2019, Vol. 40 ›› Issue (10): 1398-1402.DOI: 10.12068/j.issn.1005-3026.2019.10.006

• Materials & Metallurgy • Previous Articles     Next Articles

Martensitic Transformation and Magnetic Properties of NiMnGaTi Ferromagnetic Shape Memory Alloy

BAI Jing1,2, YANG Zhen2, ZHAO Chen-yu2, ZHAO Xiang1   

  1. 1. Key Laboratory for Anisotropy and Texture of Materials, Northeastern University, Shenyang 110819, China; 2. School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao 066004, China.
  • Received:2019-01-08 Revised:2019-01-08 Online:2019-10-15 Published:2019-10-10
  • Contact: BAI Jing
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Abstract: The microstructure, martensitic transformation and magnetic properties of Ni53Mn23.5Ga23.5-○xTi○x○(x=0, 2, 5 and 8)ferromagnetic shape memory alloys were studied to investigate the effects of different preparation methods and different Ti contents on the martensitic transformation and magnetic properties. The results show that when the Ti content increases, the grain size becomes finer, the martensitic transformation temperatures and martensitic transformation decrease, and the precipitate density increases where the appropriate amount of second-phase precipitations can facilitate to improve the high brittleness of the alloy. The EDS analysis indicates that in Ti doping alloys, the second-phase precipitation is rich in Ni and Ti constituents. The Ti addition decreases the saturation magnetization dramatically. The saturation magnetizations of Ti0 and Ti2 melt spun ribbons at the rotation speed of 900r/min are almost the same as those of the as-cast samples. However, the saturation magnetizations of the Ti5 and Ti8 melt spun samples are obviously higher than those of the as-cast ones, because the non-magnetic second-phase precipitations are suppressed in the melt spun process.

Key words: ferromagnetic shape memory alloy, NiMnGaTi, melt spun ribbon, martensitic transformation, saturation magnetization

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