Metal/composite assembly method and device

An assembly comprising a composite part made of a composite material with a polymer matrix and a metal part, assembled along assembly faces opposite an assembly interface, comprising:

• the composite part made of a composite comprising continuous reinforcing fibers in a thermoplastic matrix;
• the metal part comprising, on its assembly face, a coupling form comprising a plurality of patterns, each pattern having a closed contour in a plane parallel to the assembly face of the metal part and extending along a direction normal to the assembly face of the metal part, where a ratio between the extension of said each pattern along the direction normal to the assembly face of the metal part and a maximum diameter of the closed contour of said each pattern in the plane parallel to the assembly face of the metal part is less than 5;
• and
• a locking layer comprising an area that overlaps the composite part and an area that overlaps the metal part.