High shape recovery Ni-Ti SMA wire produced from electron beam melted ingot

Resumo

Shape recovery of a 2 mm in diameter shape memory alloy (SMA) wire produced from EB melted NiTi ingot is presented. The results indicate complete shape recovery as high as 9% and a shape recovery higher than 9% for a pre-strain between 10 and 15%. These excellent results are attributed to the high purity of starting ingot with carbon content of 0.016 wt%. It was observed no change in reverse martensitic transformation temperature for pre-strain up to 9% and for higher pre-strain there was a 50 C increase in reverse martensitic transformation peak temperatures indicating some work hardening of the material. © 2012 Elsevier B.V.

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