SITE OCCUPATION OF Cr ATOMS AT SUBLATTICE IN Fe_3Al-BASED INTERMETALLICS

The amorphous and crystalline phases were observed in molten region of the Cu-Al explosively welded joint. The crystalline phases consist of CuAl2, Cu3Al2 and Cu4Al.Recrystallization takes place in Al region adjacent to the molten zone, and the diffusion distance of Cu in Al is less than 100 nm with needle-like CuAl2 phase precipitated. Recovery takes place in Cu region adjacent to the molten zone because of the dispersive Cu2O phase precipitating,and the diffusion distance of Al in Cu is also less than 100 nm with new phase layers which might be Cu3Al2 and Cu4Al formed. Interdiffusion between Cu and Al can be observed in non-molten region with diffusion distance less than 100 nm to form new phase layers.