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Micro-resistance butt welding of NiTi shape memory alloy to 304 stainless steel micro-wires: Micro-structure evolution and inter-metallic compounds formation mechanisms
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DOI：10.1177/13621718261453134.png)
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Abstract
En 中文
<jats:p>
Joining NiTi shape memory alloy and 304 stainless steel (SS) presents significant technical challenges, and studies on micro-resistance butt welding (MRBW) of such dissimilar materials are extremely scarce. This work uncovers the nanoscale micro-structure evolution and inter-metallic compounds (IMCs) formation mechanism of NiTi to 304 SS micro-wire joints with a diameter of 0.45 mm during MRBW. Atomic diffusion of Fe and Ni promotes the formation of Fe
<jats:sub>2</jats:sub>
Ti and Ni
<jats:sub>3</jats:sub>
Ti phases, which determines the thickness, morphology, and distribution of the interfacial IMC layer. Benefiting from the high-performance Ni
<jats:sub>3</jats:sub>
Ti phase, the joint fabricated at a welding current of 20 A exhibits the optimal comprehensive performance, with a tensile strength of up to 446 MPa and an elongation of 1.5%.
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