EXTRUDED PRODUCT MADE FROM AL-CU-MG ALLOY WITH IMPROVED COMPROMISE BETWEEN MECHANICAL RESISTANCE AND TOUGHNESS

摘要

The invention relates to an extruded product made from an alloy of composition (% by weight): Cu: 5.05-5.35; Mg: 0.20-0.40; Mn: 0.20-0.40; Zr: 0.08-0.1; Ti: 0.01-0.15; Zn: 0-0.15; Si 0.10; Fe 0.15 and other elements 0.05 each and 0.15 in total, the remainder being Al, treated by dissolving, at a temperature between 525 and 540 °C, quenching, controlled traction during quenching until a permanent deformation of at least 1.5% is achieved, and returning to a temperature of between 160 and 190 °C. The products according to the invention are particularly well suited to use as pistons in an internal combustion engine of a vehicle and in particular of a racing car.