Improvement of microstructure and mechanical properties of C44300 tin brass subjected to double-pass rapid cooling friction stir welding

In this work, two-mm-thick C44300 tin brass plates were successfully joined by double-pass rapid cooling friction stir welding (RCFSW). The microstructure evolution of the welded joint was carefully studied by high resolution electron backscatter diffraction and transmission electron microscopy. The results showed that the heat-affected zone, which usually deteriorates the mechanical properties of the weld, was completely eliminated by using...