Martensitic Transformation and Magnetic-Field-Induced Strain in Magnetic Shape Memory Alloy NiMnGa Melt-Spun Ribbon

Abstract:

A non-stoichiometric polycrystalline Ni50Mn27Ga23 magnetic shape memory alloy was prepared by melt-spinning technology. The effects of melt-spinning on the martensitic transformation and magnetic-field-induced strain (MFIS) of the melt-spun ribbon were investigated. The experimental results show that the melt-spun ribbon undergoes the thermal-elastic martensitic transformation and exhibits the thermo-elastic shape memory effect. But the martensitic transformation temperature decreases and Curie temperature remains unchanged. A particular internal stress induced by melt-spinning made a texture structure in the melt-spun ribbon, which made the melt-spun ribbon obtain larger transition-induced strain and MFIS. The internal stress was released under cycling of magnetic field. This resulted in a decrease of MFIS of the melt-spun ribbon.

• Periodical: Materials Science Forum (Volumes 475-479)
• Pages: 2009-2012
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.475-479.2009
• Online since: January 2005
• Authors: Shi Hai Guo, Yang Huan Zhang, Bai Yun Quan, Jian Liang Li, Xin Lin Wang
• Keywords: Ferromagnetism, Martensitic Transformation (MT), Melt-Spinning, Ni-Mn-Ga, Shape Memory Alloy Actuator

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08 (a) M / (emu/mg) H / T 298K, before heat treatment 298K, after heat treatment 238K, before heat treatment 238K, after heat treatment.

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08 (b) M / (emu/mg) H / T 298K befor heat treatment 298K after heat treatment 238K befor heat treatment 238K after heat treatment.