Process for manufacturing a part including a formation of successive solid metal layers (20 1 ...20 n ), which are superimposed on each other, each layer describing a pattern defined using a digital model (M), each layer being formed by depositing a metal , referred to as filler metal, the filler metal being subjected to a supply of energy so as to become molten and to constitute, upon solidifying, said layer, wherein the filler metal takes the form of a powder , the exposure of which to an energy beam results in a melting followed by a solidification, so as to form a solid layer (20 1 ...20 n ), the process being characterized in that the filler metal is an aluminum alloy comprising at least the following alloy elements: - Fe, according to a mass fraction from 1 to 10%, preferably from 2 to 8%, more preferably from 2 to 5%, even more preferably from 2 to 3.5%; - Cr, according to a mass fraction from 1% to 10%, preferably from 2 to 7%, more preferably from 2 to 4%; - optionally Zr and/or Hf and/or Er and/or Sc and/or Ti, according to a mass fraction up to 4%, preferably from 0.5 to 4%, more preferably from 1 to 3%, even more preferably from 1 to 2% each, and according to a mass fraction less than or equal to 4%, preferably less than or equal to 3%, more preferably less than or equal to 2 % in total; - Si, according to a mass fraction less than or equal to 1%, preferably less than or equal to 0.5%; - optionally at least on element selected from W, Nb, Ta, Y, Yb, Nd, Mn, Ce, Co, La, Cu, Ni, Mo and/or mischmetal, according to a mass fraction less than or equal to 5% each, and less than or equal to 15% in total; - optionally at least one element selected from: Sr, Ba, Sb, Bi, Ca, P, B, In and/or Sn, according to a mass fraction less than or equal to 1% each, and less than or equal to 2 % in total; - optionally at least one element selected from: Ag according to a mass fraction from 0.06 to 1%, Li according to a mass fraction from 0.06 to 1%, and/or Zn according to a mass fraction from 0.06 to 6%; - impurities according to a mass fraction less than 0.05% each (i.e. 500 ppm) and less than 0.15% in total; - rest aluminium. - Fe, according to a mass fraction from 1 to 10%, preferably from 2 to 8%, more preferably from 2 to 5%, even more preferably from 2 to 3.5%; - Cr, according to a mass fraction from 1% to 10%, preferably from 2 to 7%, more preferably from 2 to 4%; - optionally Zr and/or Hf and/or Er and/or Sc and/or Ti, according to a mass fraction up to 4%, preferably from 0.5 to 4%, more preferably from 1 to 3%, even more preferably from 1 to 2% each, and according to a mass fraction less than or equal to 4%, preferably less than or equal to 3%, more preferably less than or equal to 2 % in total; - Si, according to a mass fraction less than or equal to 1%, preferably less than or equal to 0.5%; - optionally at least on element selected from W, Nb, Ta, Y, Yb, Nd, Mn, Ce, Co, La, Cu, Ni, Mo and/or mischmetal, according to a mass fraction less than or equal to 5% each, and less than or equal to 15% in total; - optionally at least one element selected from: Sr, Ba, Sb, Bi, Ca, P, B, In and/or Sn, according to a mass fraction less than or equal to 1% each, and less than or equal to 2 % in total; - optionally at least one element selected from: Ag according to a mass fraction from 0.06 to 1%, Li according to a mass fraction from 0.06 to 1%, and/or Zn according to a mass fraction from 0.06 to 6%; - impurities according to a mass fraction less than 0.05% each (i.e. 500 ppm) and less than 0.15% in total; - rest aluminium. <EOS>