Aluminum alloys with copper as a structural material are widely used in various fields of industry. Currently, there is growing significant interest in the method of 3D printing of products based on ferrous and non-ferrous metal alloys using selective laser fusion (SLS) technology. In addition to choosing the type of laser and the parameters of the manufacturing process, the quality of the materials obtained is influenced by the physicochemical properties of the initial powder (the stability of oxide films on the surface of particles, the tendency to form low melting phases, etc.).
The structure of the surface and volume of a 3D product obtained by the method of selective laser alloying from a powder of alloy D-16 was studied. It was found by the XPS method that on the surface of the sample there is an Al2O3 layer about 3 nm thick, and below it an Al-Cu metal alloy with a copper content of ~ 5 mass. %, which coincides with the EDX analysis performed on the initial powder by scanning electron microscopy. Local areas with a high copper content (up to 13 at. %) were found at the grain boundaries of the crystals. A high porosity of the fused sample was established (5-6%), which is almost two times higher than permissible for materials obtained by the SLS method. This is due to the crystallization features of Al-Cu system alloys associated with the transfer of matter along the interfaces, as well as to non-optimal 3D printing conditions.
It is of interest to study the physicochemical properties of D-16 powder at a synchrotron radiation source.
The research was carried out within the state assignment of FASO of Russia (theme № АААА-А19-119031890028-0)