EP3072985B2 - Alliage d' al-cu-mg-li exempt d'ag - Google Patents
Alliage d' al-cu-mg-li exempt d'ag Download PDFInfo
- Publication number
- EP3072985B2 EP3072985B2 EP15161222.3A EP15161222A EP3072985B2 EP 3072985 B2 EP3072985 B2 EP 3072985B2 EP 15161222 A EP15161222 A EP 15161222A EP 3072985 B2 EP3072985 B2 EP 3072985B2
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- European Patent Office
- Prior art keywords
- weight
- alloy
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- free
- product
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 239000001989 lithium alloy Substances 0.000 title description 5
- 229910000733 Li alloy Inorganic materials 0.000 title 1
- 229910045601 alloy Inorganic materials 0.000 claims description 81
- 239000000956 alloy Substances 0.000 claims description 81
- 229910018182 Al—Cu Inorganic materials 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 9
- 239000012535 impurity Substances 0.000 claims description 5
- QYEXBYZXHDUPRC-UHFFFAOYSA-N B#[Ti]#B Chemical compound B#[Ti]#B QYEXBYZXHDUPRC-UHFFFAOYSA-N 0.000 claims 1
- 229910033181 TiB2 Inorganic materials 0.000 claims 1
- 239000010949 copper Substances 0.000 description 12
- 239000011777 magnesium Substances 0.000 description 9
- 229910000838 Al alloy Inorganic materials 0.000 description 6
- 229910052709 silver Inorganic materials 0.000 description 5
- 239000010936 titanium Substances 0.000 description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- 230000032683 aging Effects 0.000 description 4
- 238000011835 investigation Methods 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- 229910052749 magnesium Inorganic materials 0.000 description 4
- 239000004332 silver Substances 0.000 description 4
- 229910019400 Mg—Li Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- 229910009369 Zn Mg Inorganic materials 0.000 description 2
- 229910007573 Zn-Mg Inorganic materials 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 229910000601 superalloy Inorganic materials 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910017539 Cu-Li Inorganic materials 0.000 description 1
- 229910017818 Cu—Mg Inorganic materials 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 230000018199 S phase Effects 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000010120 permanent mold casting Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 229910052845 zircon Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/057—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with copper as the next major constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/12—Alloys based on aluminium with copper as the next major constituent
- C22C21/16—Alloys based on aluminium with copper as the next major constituent with magnesium
Definitions
- the invention relates to an Ag-free Al-Cu-Mg-Li alloy and an alloy product made therefrom.
- Components made from high-performance aluminum alloys are in many cases an indispensable part of the construction of aircraft.
- Components made of such high-performance aluminum alloys are used as structural components in the fuselage and wing, among other things. These parts are extruded and / or forged parts. These must meet the necessary combination of static and dynamic strength and have certain requirements in terms of tensile strength, yield strength, elongation at break and fracture toughness (K 1C and stress corrosion cracking).
- K 1C tensile strength
- fracture toughness K 1C and stress corrosion cracking
- the weight of components that are used in the aerospace industry plays a not insignificant role.
- the specific weight (density) of the high-performance alloy used is therefore also relevant.
- a conventionally used Al-Cu-Zn-Mg alloy that meets these requirements is the aluminum alloy AA 7449.
- This previously known alloy has a composition of 1.4 - 2.1% by weight Cu, 1.8 - 2.7 wt% Mg, 7.5-8.7 wt% Zn, max. 0.2 wt% Mn, max. 0.12 wt% Si, max. 0.15% by weight Fe and max. 0.25 wt% Ti + Zr.
- the components made from this alloy have a density of around 2.85 g / cm 3 .
- Al-Cu-Zn-Mg alloy used that meets these requirements is the aluminum alloy AA 7050.
- This previously known alloy has a composition of 2.0 - 2.6% by weight Cu, 1.9 - 2.6 wt% Mg, 5.7 - 6.7 wt% Zn, max. 0.10 wt% Mn, max. 0.12% by weight Si, max. 0.15% by weight Fe and max. 0.06 wt% Ti and 0.08-0.15 wt% Zr max. 0.06% by weight Ti.
- the components made from this alloy have a density of approximately 2.83 g / cm 3 .
- Al-Cu-Li alloys have been developed in order to meet this requirement, based on the alloy AA 7449 and AA7050, which have strength values comparable to those of the alloy AA 7449 and AA 7050, although the specific weight of components made from them is around 2.7 g / cm 3 .
- the aluminum alloy AA 2050 is an example of such a high-performance alloy, which often replaces components that were previously made from the alloy AA 7449 in the aerospace sector.
- the alloy AA 2050 has a Cu content of 3.2 - 3.9% by weight, a Li content of 0.7 - 1.3% by weight and an Mg content of 0.1 - 0, 5% by weight.
- Zn usually contributes up to 0.25% by weight to the structure of the alloy.
- silver is added to this alloy in a content of 0.2-0.7% by weight. This measure takes account of the prevailing opinion that silver, especially in lithium-containing Al-Cu alloys, is a necessary alloy component to achieve high strengths in components made from it.
- alloy AA 2196 with a Li content of 1.4-2.1% by weight.
- the Cu content of this alloy is slightly reduced compared to the Cu content in alloy 2050.
- only components with a lower fracture toughness and stress corrosion cracking can be produced from this alloy compared to components that can be produced from the AA 2050 alloy.
- the invention is based on the object of providing an Al-Cu-aluminum alloy with which high-strength and ultra-high-strength components can be produced, as well as a product made therefrom, particularly suitable for use as a component in an air or For aerospace engineering, to propose that not only meet the strength requirements, but are also more cost-effective in terms of materials compared to the components made from the AA 2050 alloy.
- All alloy compositions that are described in the context of these explanations can contain unavoidable impurities of 0.05% by weight per element, the total amount of impurities should not exceed 0.15% by weight. However, it is preferred to keep the impurities as low as possible hold, so that these per element do not exceed a proportion of 0.02% by weight and a total amount of 0.08% by weight.
- Components with extremely high-strength properties can only be produced within the narrow limits of the alloying elements used using an otherwise customary heat treatment process.
- Artificial aging is preferably carried out so that maximum strengths are set in the component made from the alloy.
- a conventional artificial aging process is considered to be one in which artificial aging is carried out between 145 ° C. and 170 ° C. with an adapted artificial aging time between 10 h and 90 h.
- This alloy is characterized by particularly narrow bandwidths in the proportions of alloy elements. Apart from this, the alloy is Ag and Zn-free, even if a certain amount of Zn can be tolerated. It was precisely against the background of the prevailing opinion that the necessary strengths could only be achieved with a Li-containing Al-Cu alloy in the components made from it if silver is added in not inconsiderable proportions, surprisingly to find that one of the Alloy-made component not only meets the strength requirements set by the options of alloy AA 7449, but even has increased strength properties compared to this and also to alloy AA 2050.
- the targeted narrow bandwidth of the contents of the alloy partners provides an Al-Cu-Mg-Li alloy from which high-strength components can be manufactured.
- a component has high-strength properties if the yield strength R p0.2 is at least 600 MPa.
- a component is assigned high-strength properties if the yield strength R p0.2 is at least 500 MPa.
- the Cu content is below 3.5% by weight, the necessary strength is not achieved in combination with the other alloy elements. Copper contents of more than 4.3% by weight in the alloy are unable to further increase the strength of a component made from the alloy. Rather, it is to be expected that with higher Cu contents. Phases arise that could damage the fracture properties and the fatigue behavior.
- Lithium is contained in the alloy to reduce the density (the specific weight).
- the lithium content is adapted to the Cu and Mg contents of the alloy, namely in such a way that as much lithium as possible is incorporated into the alloy, but only enough so that it is brought into solution and no undesired Li-containing phases arise. Therefore, the Li content of the alloy is limited to the narrow range between 0.8 and 1.3 wt%.
- Magnesium contributes to the desired properties of a component made from the alloy, but is only permitted in part so that no undesired phases (such as the S phases Al 2 CuMg) arise. Taking into account the other alloying elements, the Mg content should not exceed 0.8% by weight.
- Titanium is added to the alloy to refine the cast structure and zircon to avoid / inhibit undesirable recrystallization during hot forming.
- Components made from this alloy are cheaper because the alloy is Ag-free.
- the cost of the material used to create the alloy can be up to 30% and more lower than the corresponding costs of an Ag-containing comparison alloy.
- the specific weight of a component made from this alloy is approximately 2.7 g / cm 3 for a typical alloy composition and thus corresponds to the specific weight, for B. a component made from the alloy AA 2050.
- the components made from this alloy have the same weight-reducing advantage as these components that, for. B. made of the alloy AA 2050 is awarded.
- the strength properties are relatively uniform over the range of the alloyed elements.
- Fe cannot be completely avoided as an accompanying element.
- contents between 0.02-0.035% by weight are tolerable.
- alloys according to the invention and comparative alloys were melted and cast into test bars on a laboratory scale by permanent mold casting.
- the melted alloys have the following composition, the alloys XL21, XL29 being alloys according to the invention, while the other alloys have been melted as comparison alloys: alloy Cu Li Mg Mn Ti Zr Si Fe Ag Zn XL21 3.87 0.97 0.46 0.17 0.05 0.10 0.02 0.027 ⁇ 0.02 ⁇ 0.02 XL29 4.1 0.95 0.47 0.17 0.04 0.11 0.03 0.03 ⁇ 0.02 ⁇ 0.02 AA 2050 3.72 0.94 0.31 0.38 0.04 0.092 0.04 0.063 0.491 ⁇ 0.02 AA 2196 2.61 1.6 0.37 ⁇ 0.02 0.05 0.11 0.02 0.03 0.3 ⁇ 0.02 AA 7449 1.62 ⁇ 0.02 2.45 0.15 0.02 0.10 0.04 0.09 ⁇ 0.02 7.7 AA 7050 2.24 ⁇ 0.02 2.17 0.08 0.03 0.11 0.06 0.09 ⁇ 0.02 6.4
- a component made from this alloy is suitable due to the properties described above as a component for use in the aerospace industry, especially for structural components. At the same time, components made of this alloy can also be manufactured and used for other applications, especially if a low density should also play a role.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Conductive Materials (AREA)
- Extrusion Of Metal (AREA)
- Sliding-Contact Bearings (AREA)
Claims (7)
- Alliage Al-Cu exempt d'Ag comportant3,5 à 4,3 % de poids de Cu,0,9 à 1,2 % de poids de Li,0,38 à 0,6 % de poids de Mg,0,14 à 0,22 % de poids de Mn,0,08 à 0,17 % de poids de Zr,0,03 à 0,07 % de poids de Ti, le Ti étant présent sous forme de TiB2 ou de TiC,max. 0,08 % de poids de Fe,max. 0,05 % de poids de Si,le reste, de l'Al ainsi que les inévitables impuretés pour un total de 0,15 % de poids maximum.
- Alliage Al-Cu exempt d'Ag comportant3,7 à 4,0 % de poids de Cu,0,9 à 1,2 % de poids de Li,0,43 à 0,52 % de poids de Mg,0,14 à 0,20 % de poids de Mn,0,09 à 0,11 % de poids de Zr,0,04 à 0,06 % de poids de Ti,max. 0,08 % de poids de Fe,max. 0,05 % de poids de Si,le reste, de l'Al ainsi que les inévitables impuretés pour un total de 0,15 % de poids maximum.
- Alliage Al-Cu exempt d'Ag selon l'une des revendications 1 ou 2, caractérisé en ce que l'alliage contient en plus au maximum 0,03 % de poids de Si et/ou au maximum 0,05 % de poids de Fe.
- Alliage Al-Cu exempt d'Ag selon l'une des revendications 1 à 3, caractérisé en ce que le rapport Cu/mg correspond à la formule suivante : 3,85 % de poids - 0,7 % de poids de Mg < Cu < 4,63 % de poids -0,7 % de poids de Mg.
- Alliage Al-Cu exempt d'Ag selon l'une des revendications 1 à 4, caractérisé en ce que la composition de l'alliage a été sélectionnée de telle sorte qu'un produit fabriqué à partir de ce dernier présente une densité de moins de 2,73 g/cm3, notamment de moins de 2,71 g/cm3, de préférence d'environ 2,70 g/cm3.
- Produit d'alliage Al-Cu-Mg-Li exempt d'Ag constitué d'une composition d'alliage selon l'une des revendications 1 à 4 et de préférence d'une densité selon la revendication 5, caractérisé en ce que le produit a été homogénéisé, moulé à chaud, recuit en solution, étiré, vieilli à chaud et ensuite étiré de telle manière que le produit d'alliage présente une limite d'élasticité Rp0,2 de plus de 600 MPa et une résistance à la traction Rm de plus de 640 MPa et un allongement à la rupture de plus de 7 %.
- Produit d'alliage selon la revendication 6, caractérisé en ce que le produit d'alliage est un produit prévu pour une application technique aéronautique et/ou aérospatiale.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES15161222T ES2642730T5 (es) | 2015-03-27 | 2015-03-27 | Aleación de Al-Cu-Mg-Li exenta de Ag |
EP15161222.3A EP3072985B2 (fr) | 2015-03-27 | 2015-03-27 | Alliage d' al-cu-mg-li exempt d'ag |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP15161222.3A EP3072985B2 (fr) | 2015-03-27 | 2015-03-27 | Alliage d' al-cu-mg-li exempt d'ag |
Publications (3)
Publication Number | Publication Date |
---|---|
EP3072985A1 EP3072985A1 (fr) | 2016-09-28 |
EP3072985B1 EP3072985B1 (fr) | 2017-07-05 |
EP3072985B2 true EP3072985B2 (fr) | 2020-08-26 |
Family
ID=52780887
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15161222.3A Active EP3072985B2 (fr) | 2015-03-27 | 2015-03-27 | Alliage d' al-cu-mg-li exempt d'ag |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP3072985B2 (fr) |
ES (1) | ES2642730T5 (fr) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11220729B2 (en) * | 2016-05-20 | 2022-01-11 | Ut-Battelle, Llc | Aluminum alloy compositions and methods of making and using the same |
CN106893911B (zh) * | 2017-02-27 | 2018-05-15 | 广东省材料与加工研究所 | 一种高强耐热Al-Cu系铝合金及其制备方法 |
US11242587B2 (en) | 2017-05-12 | 2022-02-08 | Ut-Battelle, Llc | Aluminum alloy compositions and methods of making and using the same |
US11180839B2 (en) | 2017-10-26 | 2021-11-23 | Ut-Battelle, Llc | Heat treatments for high temperature cast aluminum alloys |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998033947A1 (fr) † | 1997-01-31 | 1998-08-06 | Reynolds Metals Company | Procede servant a ameliorer la tenacite d'alliages d'aluminium et de lithium |
US20090142222A1 (en) † | 2007-12-04 | 2009-06-04 | Alcoa Inc. | Aluminum-copper-lithium alloys |
US20100183474A1 (en) † | 2009-01-22 | 2010-07-22 | Alcoa Inc. | aluminum-copper alloys containing vanadium |
US20110030856A1 (en) † | 2009-06-25 | 2011-02-10 | Alcan Rhenalu | Casting process for aluminum alloys |
US20120225271A1 (en) † | 2011-02-17 | 2012-09-06 | Alcoa Inc. | 2xxx series aluminum lithium alloys |
US20140050936A1 (en) † | 2012-08-17 | 2014-02-20 | Alcoa Inc. | 2xxx series aluminum lithium alloys |
WO2014167191A1 (fr) † | 2013-04-12 | 2014-10-16 | Constellium France | Procédé de transformation de tôles en alliage al-cu-li améliorant la formabilité et la résistance à la corrosion |
-
2015
- 2015-03-27 ES ES15161222T patent/ES2642730T5/es active Active
- 2015-03-27 EP EP15161222.3A patent/EP3072985B2/fr active Active
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998033947A1 (fr) † | 1997-01-31 | 1998-08-06 | Reynolds Metals Company | Procede servant a ameliorer la tenacite d'alliages d'aluminium et de lithium |
US20090142222A1 (en) † | 2007-12-04 | 2009-06-04 | Alcoa Inc. | Aluminum-copper-lithium alloys |
US20100183474A1 (en) † | 2009-01-22 | 2010-07-22 | Alcoa Inc. | aluminum-copper alloys containing vanadium |
US20110030856A1 (en) † | 2009-06-25 | 2011-02-10 | Alcan Rhenalu | Casting process for aluminum alloys |
US20120225271A1 (en) † | 2011-02-17 | 2012-09-06 | Alcoa Inc. | 2xxx series aluminum lithium alloys |
US20140050936A1 (en) † | 2012-08-17 | 2014-02-20 | Alcoa Inc. | 2xxx series aluminum lithium alloys |
WO2014167191A1 (fr) † | 2013-04-12 | 2014-10-16 | Constellium France | Procédé de transformation de tôles en alliage al-cu-li améliorant la formabilité et la résistance à la corrosion |
Also Published As
Publication number | Publication date |
---|---|
ES2642730T3 (es) | 2017-11-17 |
ES2642730T5 (es) | 2021-06-09 |
EP3072985B1 (fr) | 2017-07-05 |
EP3072985A1 (fr) | 2016-09-28 |
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