Solid Phase Processing (SPP), such as Friction Extrusion (FE) and Shear Assisted Processing and Extrusion (ShAPE), have proven to be effective in recycling aluminum waste (scrap, chips, etc.) to produce extrudates such as rods or tubes. Although rapid consolidation and extrusion are achieved, the properties of the materials are not changed or improved. In the present invention, we developed an in-situ solid phase alloying method to upcycle metal waste into high performance alloys. Alloying elements were added and dispersed in the metal precursor, while dissolving, reacting or precipitating in the matrix during the extrusion process to form the desired phases that were not present in the precursor.