Abstract

The effect of partial cycling on the martensitic transformation of NiTi alloys were studied in the paper. If the reverse transformation of NiTi alloys is arrested at a certain temperature, and then partially cycled for several times, a progressive increase in the transformation martensite mass below this temperature is observed. The effect of this so-called “hammer procedure” in NiTi alloys is different from that in copper-based shape memory alloys. This result suggests that elastic energy might not be a main reason for the phenomenon. The phenomenon is thought to be closely related with the well-known fact that transformation temperatures decrease with thermal cycling in NiTi alloys.

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