Abstract
In this work, a novel understanding was proposed to explain bonding process of a cold sprayed Cu particle deposition. The cleaning effect by the extrusion of viscous metal jet was proved for the first time by the observation of oxides fragments located at the periphery of detached particle, which promoted the formation of metallurgical bonding around central area. It is more interests to find the existence of micro-cracks on contact interface, which revealed the clue of interfacial melting. However, the lack of dimple-like fractures suggests that the interfacial melting at the contact interface is not a prerequisite for metallurgical bonding.
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