AL-MG-ZN WROUGHT ALLOY PRODUCT AND METHOD OF ITS MANUFACTURE

摘要

An aluminum alloy wrought product including, in wt. %, Mg 3.0 to 7.0, Zn 0.6 to 2.8, Mn 0 to 1.0, Cu 0 to 2.0, Sc 0 to 0.6, at least one element selected from the group of Zr 0.04 to 0.4, Cr 0.04 to 0.4, Hf 0.04 to 0.4 and Ti 0.01 to 0.3; Fe maximum 0.3, Si maximum 0.3, inevitable impurities, and balance aluminum. The range for the Zn-content in wt. % is a function of the Mg-content according to: lower-limit of the Zn-range: [Zn]=0.34[Mg]−0.4, and upper-limit of the Zn-range: [Zn]=0.34[Mg]+0.4.

主权项

1. Method of manufacturing an aluminium wrought product comprising the steps of:
a) casting stock of an ingot of an AlMg alloy having a chemical composition comprising, in wt. %, Mg 3.0 to 7.0 Zn 0.6 to 2.8 Mn 0 to 1.0 Cu 0 to 2.0 Sc 0 to 0.05, at least one element selected from the group consisting of:
Zr 0.04 to 0.4Cr 0.04 to 0.4Hf 0.04 to 0.4 andTi 0.01 to 0.3, Fe max. 0.3 Si max. 0.3,
inevitable impurities, balance aluminium, and whereby the range for the Zn-content is a function of the Mg-content according to:
lower-limit of the Zn-range: [Zn]=0.34[Mg]−0.4, andupper-limit of the Zn-range: [Zn]=0.34[Mg]+0.4; b) preheating and/or homogenising the cast stock; c) hot working the stock by one or more methods selected from the group consisting of rolling, extrusion, and forging; d) annealing of the hot worked stock, wherein the annealing treatment is carried out at a temperature in a range of 350° C. to 475° C., followed by rapid cooling; e) cold working the annealed and cooled stock; f) optionally stretching or compressing of the cold worked stock; g) heat treating of the stock to achieve a desired temper.