EP 3899075 A1 20211027 - AL- ZN-CU-MG ALLOYS AND THEIR MANUFACTURING PROCESS
Title (en)
AL- ZN-CU-MG ALLOYS AND THEIR MANUFACTURING PROCESS
Title (de)
AL-ZN-CU-MG-LEGIERUNGEN UND DEREN HERSTELLUNGSVERFAHREN
Title (fr)
ALLIAGES AL-ZN-CU-MG ET LEUR PROCÉDÉ DE FABRICATION
Publication
Application
Priority
- EP 18214960 A 20181220
- EP 2019086106 W 20191218
Abstract (en)
[origin: EP3670690A1] The invention relates to a rolled aluminum-based alloy product having a thickness of at least 80 mm comprising, (in weight %) : Zn 6.85 - 7.25, Mg 1.55 - 1.95, Cu 1.90 - 2.30, Zr 0.04 - 0.10, Ti 0 - 0.15, Fe 0 - 0.15, Si 0 - 0.15, other elements ≤ 0.05 each and ≤ 0.15 total, remainder Al, wherein at mid-thickness more than 75 % of grains are recrystallized or at mid-thickness 30 to 75 % of grains are recrystallized and non-recrystallized grains have an aspect ratio in a L/ST cross section less than 3. A process for the manufacture of a rolled aluminum-based alloy product comprises the steps of: (a) casting an ingot made in an alloy according to the invention, (b) conducting an homogenization of the ingot (c) conducting hot rolling of said homogenized ingot in one or more stages by rolling, (d) conducting a solution heat treatment a quench, (e) conducting stress relieving, and, (f) conducting an artificial aging treatment. The products of the invention are suitable for aircraft construction and have advantageous fatigue crack growth properties.
IPC 8 full level
C22C 21/10 (2006.01); C22F 1/053 (2006.01)
CPC (source: EP US)
C21D 9/46 (2013.01 - US); C22C 21/10 (2013.01 - EP US); C22F 1/053 (2013.01 - EP US)
Citation (search report)
See references of WO 2020127592A1
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
EP 3670690 A1 20200624; BR 112021010783 A2 20210831; CA 3121837 A1 20200625; CN 113166859 A 20210723; EP 3899075 A1 20211027; EP 3899075 B1 20221116; US 2022081740 A1 20220317; WO 2020127592 A1 20200625
DOCDB simple family (application)
EP 18214960 A 20181220; BR 112021010783 A 20191218; CA 3121837 A 20191218; CN 201980083452 A 20191218; EP 19828721 A 20191218; EP 2019086106 W 20191218; US 201917415590 A 20191218