PROCEDE DE FABRICATION D'UNE PIECE EN ALLIAGE D'ALUMINIUM

Procédé de fabrication d'une pièce (20) comportant une formation de couches métalliques (201...20n) successives, superposées les unes aux autres, chaque couche décrivant un motif défini à partir d'un modèle numérique, chaque couche étant formée par le dépôt d'un métal (15, 25), dit métal d'apport, le métal d'apport étant soumis, à une pression supérieure à 0.5 fois la pression atmosphérique, à un apport d'énergie de façon à entrer en fusion et à constituer ladite couche, le procédé étant caractérisé en ce que le métal d'apport est un alliage d'aluminium de la série 2xxx, comprenant les éléments d'alliage suivant : Cu, selon une fraction massique comprise entre 3 % et 7 % ; Mg, selon une fraction massique comprise entre 0.1 % et 0.8 %. 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 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 0.01% and 2%, preferably of at most 1% and in a preferred manner of at most 0.3%; * V, in a weight fraction of between 0.05% and 2%, preferably of at most 1% and in the preferred manner of at most 0.3%; * Zr, in a weight fraction of between 0.05% and 2%, preferably of at most 1% and in a preferred manner of at most 0.3%; * Cr, in a weight fraction of between 0.05% and 2%, preferably of at most 1% and in the preferred manner of at most 0.3%; and - optionally at least one element, or at least two elements or even at least three elements chosen from: * Ag, in a weight fraction of between 0.1% and 0.8%; * Li, in a weight fraction of between 0.1% and 2%, preferably 0.5% and 1.5%; * Zn, in a weight fraction of between 0.1% and 0.8%.