Abstract: The invention relates to a method for manufacturing an aluminum alloy sheet, wherein an aluminum alloy is prepared with the following composition, in wt %: Mg: 4.0-5.2, Mn: 0.40-1.0, Zn: 0.15-0.40, at least one element selected from Ti, Cr, Cu and Zr, the content of the element, if selected, being 0.01-0.15 for Ti, 0.05-0.25 for Cr, 0.02-0.25 for Cu, 0.05-0.25 for Zr, Fe: <0.40, Si: <0.40, other elements or impurities<0.05 each and<0.15 in total, the remainder being aluminum. A rolling plate is cast by vertical semi-continuous casting, and said optionally homogenised plate is hot-rolled in two successive stages to obtain a sheet. The sheets obtained by the method according to the invention are advantageous, in particular for shipbuilding, since they demonstrate, after being exposed for 7 days to a temperature of 100° C., a weight loss of less than 15 mg/cm2 during a corrosion test according to the ASTM G67 standard.

Abstract: The invention relates to a process for manufacturing a part (20) comprising a formation of successive solid metal layers (201 . . . 20n), superimposed on one another, each layer describing a pattern defined from a numerical model (M), each layer being formed by the deposition of a metal (25), referred to as a filler metal, the filer metal being subjected to an input of energy so as to melt and constitute, by solidifying, said layer, wherein the filler metal takes the form of a powder (25), of which the exposure to an energy beam (32) results in a melting followed by a solidification in such a way as to form a solid layer (201, . . . 20n), the method being characterized in that the filler metal (25) is an aluminum alloy comprising at least the following alloying elements: Si, according to a weight fraction from 4% to 20%; Fe, according to a weight fraction from 2% to 15%. The invention also relates to a part obtained by this method.

Abstract: The present invention relates to a process for manufacturing a part (20) comprising a formation of successive metal layers (201 . . . 20n), superimposed on one another, each layer describing a pattern defined from a numerical model, each layer being formed by the deposition of a metal (15, 25), referred to as a filling metal, the filling metal being subjected, at a pressure greater than 0.5 times the atmospheric pressure, to an input of energy so as to melt and constitute said layer, the process being characterized in that the filling metal is an aluminium alloy of the 2xxx series, comprising the following alloying elements: Cu, in a weight fraction of between 3% and 7%; Mg, in a weight fraction of between 0.1% and 0.8%; at least one element, or at least two elements or even at least three elements chosen from: Mn, in a weight fraction of between 0.1% and 2%, preferably of at most 1% and in a preferred manner of at most 0.8%; Ti, in a weight fraction of between 0.