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NiTi Wires Coated by Nanomultilayers – A Solution for Self-healing?

One of the causes that can lead to the replacement or repair of metallic components is the propagation of cracks, which limits their lifetime. In this context, it is critical to develop self-healing systems for repairing cracks locally [1]. A possible strategy for this purpose consists in the incorporation of nitinol (NiTi) wires coated with nanoscale reactive multilayer (ML) thin films. These multilayers react releasing heat in a highly localized way, and in certain circumstances the reaction can become self-sustained. Therefore, reactive MLs are promising for a variety of applications, including joining [2]. The heat released after reaction can be used to melt a repairing material (low melting temperature) which will serve as a mobile phase to fill the crack. The coated material constitutes a self-healing system because the shape memory NiTi wires themselves can be used as sensors for the detection of cracks.