Transformation and Damping Characteristics of NiTi/NiTi Alloys Synthesized by Explosive Welding

The present work aims to investigate transformation and damping characteristics of a Ni51Ti/Ni50.2Ti alloy synthesized by explosive welding. The DSC results showed that the two endothermic peaks of the unprestrained specimen corresponded to the reverse transformation of each NiTi component. The reverse transformation temperature of Ni50.2Ti increased with increasing prestrain level, whereas the reverse transformation peak of Ni51Ti was split up into two independent endothermic peaks. Meanwhile, the internal friction results showed that the temperatures of the internal friction peaks of the Ni51Ti/Ni50.2Ti alloy and the range of reverse transformation temperature increased with increasing of prestrain level, which is consistent with the DSC results. Explosive welding is confirmed an effective method to fabricate chemical heterogeneous shape memory materials.