The phase transformation and electron microscopic characterization of Ni-Mn-Ga ferromagnetic shape memory alloys (FSMA) powders produced by spark erosion were investigated. Powder quenched in liquid argon were solid spheres and in nitrogen were hollow spherical particles. It was observed that the electron microscopy observation of powders as sparked in nitrogen were highly disordered nanocrystalline grains and in liquid display extensive crystallinity. The results show that Ni-Mn-Ga powders were suitable for the development of magnetic-field-driven FSMA powder/polymer microcomposites.
ASJC Scopus subject areas
- Physics and Astronomy(all)