Tailoring Al–Li Alloy Surface Wettability with a Femtosecond Laser and Its Effect on Bonding Performance

In this study, a femtosecond laser was used to pretreat the surface of Al–Li alloy, micromorphology, roughness, contact angle, and wettability which were adjusted by changing scanning speed, sample bonded into single joint with polyether ether ketone (PEEK) adhesive. The mechanism treatment affecting bonding strength alloy explored through tensile shear experiments. results indicated that optimizing parameters could change roughness micromorphology so as its free energy strength. Compared untreated sample, increased 81%, 95%, 107%, 91%, 78% under at 25, 20, 15, 10, 5 mm/s, respectively. As whole, etching had an important influence on performance.