Effects of colling rate and annealing temperature on the microstructure and grain size have been investigated in Fe-Mn-Si based SMA Ribbons, and the correlation between those intrinsic factors and martensitic transformation characteristics has been discussed.

When Fe-Mn-Si based SMA ribbons were fabricated by RSP, grain size of the ribbon was refined up to 4 ㎛ and the uniformity of grains were improved by increasing wheel speed i.e cooling rate. The volume fraction of thermal ε martensite was increased by increasing colling rate.

Refined grains of the melt-spin ribbon were partially grown by annealing above 300℃×3min. By increasing annealing temperature, the volume fraction of thermal ε martensite was increased and that of α′martensite were also highly increased in the resultant ribbons. Ms temperature of annealed ribbon was higher than that of as-spun ribbon and transformation temperature hysteresis(Af-Ms) was decreased by increasing annealing temperature.

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