Low-density aluminum-copper-lithium alloy products

Patent metadata

Field	Value
Publication number	US-11667997-B2
Application number	US-201816603703-A
Country	US
Kind code	B2
Filing date	Apr 9, 2018
Priority date	Apr 10, 2017
Publication date	Jun 6, 2023
Grant date	Jun 6, 2023

Abstract

The invention relates to a product made of an aluminium-based alloy comprising, by wt. %, Cu: 2.4-3.2; Li: 1.6-2.3; Mg: 0.3-0.9; Mn: 0.2-0.6; Zr: 0.12-0.18; such that Zr≥−0.06 *Li+0.242; Zn: <1.0; Ag: <0.15; Fe+Si≤0.20; optionally, at least one element selected from Ti, Sc, Cr, Hf and V, the content of the element, if selected, being: Ti: 0.01-0.1; Sc: 0.01-0.15; Cr: 0.01-0.3; Hf: 0.01-0.5; V: 0.01-0.3; other elements ≤0.05 each and ≤0.15 in total; the remainder being aluminium. The invention also relates to a method for manufacturing an as-cast aluminum alloy product according to the invention, comprising the following steps: preparing a liquid metal bath; casting an as-cast shape from said liquid metal bath; and solidifying the as-cast shape into a billet, a rolling plate or a forging blank; characterised in that the casting is performed without adding any grain refiner, or by adding a refiner comprising (i) Ti and (ii) B or C, such that the content of B from the refiner is less than 45 ppm, and that of C is less than 6 ppm, and/or characterised in that the casting is carried out, for an as-cast shape of thickness E or with a diameter D greater than 150 mm, at a casting rate v (mm/min) greater than 30 for a plate-type as-cast shape or 9000/D for a billet-type as-cast shape.

First claim

The invention claimed is:

1. An as-cast product comprising an alloy containing aluminum comprising, in % by weight,
Cu: 2.4-3.2;
Li: 1.6-2.3;
Mg: 0.3-0.9;
Mn: 0.2-0.6;
Zr: 0.12-0.18; and
such that Zr≥-0.06*Li+0.242 or Zr*Li≥0.235,

Zn: <1.0;
Ag: <0.15;
Fe+Si≤0.20;
optionally at least one element selected from the group consisting of Ti, Sc, Cr, Hf and V, the concentration of the element if chosen, being in % by weight:
Ti: 0.01-0.15;
Sc: 0.01-0.15;
Cr: 0.01-0.3;
Hf: 0.01-0.5;
V: 0.01-0.3;

other elements ≤0.05 each and ≤0.15 in total, the rest aluminum;
manufactured by a method comprising:
a) producing a bath of liquid metal;
b) casting an unwrought product from said bath of liquid metal;
c) solidifying the unwrought product into a billet, a rolling ingot or a forging blank;
wherein the casting is carried out without addition of a grain refiner or adding a refiner comprising (i) Ti and (ii) B or C, such that the concentration of B coming from a refining agent is less than 45 ppm, and the concentration of C is less than 6 ppm,
wherein the product after step c) is an as-cast product;
wherein the as-cast product has a thickness or a diameter greater than 150 mm, and a grain size less than 110 μm.

2. The as-cast product according to claim 1 , having a thickness or having a diameter greater than 250 mm and having a grain size less than 105 μm.

3. The as-cast product according to claim 1 , having a thickness or having a diameter greater than 300 mm, and having a grain size less than 90 μm.

4. The as-cast product according to claim 1 , wherein the concentration of manganese is from 0.3 to 0.6% by weight.

Assignees

• Constellium Issoire

Inventors

• CHEVY Juliette
• Jarry Philippe
• Blais Soizic
• Arbab Alireza

Classifications

• C22F1/057 Primary

  of alloys with copper as the next major constituent · CPC title

• C22C21/18

  with zinc · CPC title

• C22C21/16 Primary

  with magnesium · CPC title