| Abstract Scope |
Compared with conventional coarse grain materials, nanomaterials have excellent mechanical properties. However, there is a grain coarsening tendingcy of such materials under annealing. Consequently, nanomaterials bonding is the key technology that restricts the application of nanomaterials. In this study, the Cu/Al joints were connected by friction stir welding, the rotating speed of stirring head was selected 800rpm, 1000rpm, and the welding speed was 50mm/min respectively. The results show that under a parameter of 1000rpm, with a welding speed of 50mm/min, there observed sufficient diffusion interface in the joint of coarse-grained aluminum (CG-Al, ~20 μm) with an ultrafine-grained copper(UFG-Cu, ~200 nm), The grain size of ~3μm, the bonding strength of ~264 MPa as well as microhardness of 180 Hv. Under the condition of 800rpm-50mm/min, the interfacial bonding strength of CG-Al/UFG-Cu was higher than that of CG-Al/CG-Cu. Therefore, The comprehensive mechanical properties of CG-Al/UFG-Cu were the best under the condition of 1000rpm-50mm/min. |