Aluminum material having improved precipitation hardening

Patent metadata

Field	Value
Publication number	US-10030293-B2
Application number	US-201414338652-A
Country	US
Kind code	B2
Filing date	Jul 23, 2014
Priority date	Jul 24, 2013
Publication date	Jul 24, 2018
Grant date	Jul 24, 2018

Abstract

An aluminum material for producing light-weight components includes aluminum (Al), scandium (Sc), zirconium (Zr) and ytterbium (Yb), where a weight ratio of scandium (Sc) to zirconium (Zr) to ytterbium (Yb) [Sc/Zr/Yb] is in a range from 10/5/2.5 to 10/2.5/1.25.

First claim

What is claimed is:

1. A method for producing an aluminum material, the method comprising the steps:
a) providing an aluminum (AD-scandium (Sc)-zirconium (Zr) base alloy;
b) adding ytterbium (Yb) to the AlScZr base alloy from step a) to produce a molten aluminum (Al)-scandium(Se)-zirconium(Zr)-ytterbium (Yb) alloy;
c) cooling the molten AlScZrYb alloy obtained in step b) in a temperature interval T liquidus to T 350° C. at a cooling rate of ≥100 K/sec to produce a solidified AlScZrYb alloy; and
d) heat treating the solidified AlScZrYb alloy in a temperature range from 250 to 500° C.,
wherein a weight ratio of scandium (Sc) to zirconium (Zr) to ytterbium (Yb) [Sc/Zr/Yb] is in a range from 10/5/2.5 to 10/2.5/1.25.

2. The method of claim 1 , wherein the AlScZr base alloy is obtained by previously adding zirconium (Zr) to an aluminum (Al)-scandium (Sc) base alloy.

3. The method of claim 1 , wherein an AlScZr base alloy or an AlSc base alloy is used, which comprises at least one further alloying element selected from the group consisting of Mg, Zn, Cu, Mn, Si, Li, Ag in an amount from 0.5 to 10.0% by weight, Ti, Nb, Ta, Hf, Fe, Ni, Co, Cr, V and/or at least one further alloying element selected from the group of lanthanides comprising Y, La, Eu, Nd, Gd, Tb, Dy, Er, Pr and Ce in an amount from 0.05 to 2.0% by weight, based on the total weight of the AlScZr or AlSc base alloy, per element.

4. The method of claim 1 , wherein the AlScZr base alloy and/or the AlSc base alloy are present
a) in powder or wire form, or
b) as sintered, cast, rolled or extruded molded parts.

5. The method of claim 1 , wherein the melting of the AlScZrYb alloy in step b) is carried out
a) by way of a laser beam, an electron beam or an arc,
b) by way of a chemical exothermic reaction, and/or
c) capacitively, conductively or inductively.

6. The method of claim 1 , wherein the molten AlScZrYb alloy is cooled in the temperature interval T liquidus to T 350° C. at a cooling rate of ≥150 K/sec.

7. The method of claim 1 , wherein the AlScZrYb alloy is cooled to room temperature.

8. The method of claim 1 , wherein the heat treatment of the solidified AlScZrYb alloy is carried out for a duration from 10 minutes to 100 hours and/or takes place in multiple stages and/or steps.

9. The method of claim 1 , wherein the heat-treated AlScZrYb alloy is subjected to cooling to room temperature and the cooling rate is ≥10 K/sec.

10. The method of claim 1 , wherein, following the heat treatment from step d), at least one further heat treatment process is carried out
a) in air, protective gas or under vacuum in a temperature range from 300 to 400° C. for a duration from 10 minutes to 100 hours and/or in multiple stages and/or steps, or
b) by way of hot isostatic pressing in a temperature range from 300 to 400° C. and a pressure range from 100 to 10000 bar and/or in multiple stages and/or steps.

Assignees

• Airbus Defence & Space Gmbh

Inventors

• Palm Frank

Classifications

• B22F1/00

  Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties · CPC title

• B22F1/142

  Thermal or thermo-mechanical treatment · CPC title

• C22F1/04 Primary

  of aluminium or alloys based thereon · CPC title

• C22F1/02

  in inert or controlled atmosphere or vacuum (adjusting the composition of the atmosphere C21D1/76) · CPC title

• C22C1/03

  using master alloys · CPC title