Laser shock microforming of Aluminum(Al) foil through fs laser has been researched in this paper. The influences
of confining layer, clamping method and impact times on induced dent depths were investigated experimentally.
Microstructure of fs laser shock forming Al foil was observed through Transmission electron microscopy (TEM). Under
the condition of tightly clamping, the dent depths increase with impact times and finally tend to saturating. Another new
confining layer, the main component of which is polypropylene, was applied and the confining effect of it is better
because of its higher impedance. TEM results show that dislocation is one of the main deformation mechanisms of fs
laser shock forming Al foil. Specially, most of dislocations exist in the form of short and discrete dislocation lines.
Parallel straight dislocation slip line also were observed. We analyzed that these unique dislocation arrangements are
due to fs laser-induced ultra high strain rate.