EP3818187A1 - Alliage d'aluminium et produit d'alliage d'aluminium survieilli obtenu à partir d'un tel alliage - Google Patents

Alliage d'aluminium et produit d'alliage d'aluminium survieilli obtenu à partir d'un tel alliage

Info

Publication number
EP3818187A1
EP3818187A1 EP18743409.7A EP18743409A EP3818187A1 EP 3818187 A1 EP3818187 A1 EP 3818187A1 EP 18743409 A EP18743409 A EP 18743409A EP 3818187 A1 EP3818187 A1 EP 3818187A1
Authority
EP
European Patent Office
Prior art keywords
weight
aluminum alloy
alloy
eac
aluminum
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.)
Granted
Application number
EP18743409.7A
Other languages
German (de)
English (en)
Other versions
EP3818187B1 (fr
Inventor
Joachim Becker
Matthias Hilpert
Thomas Witulski
Michael BESEL
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Otto Fuchs KG
Original Assignee
Otto Fuchs KG
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Filing date
Publication date
Application filed by Otto Fuchs KG filed Critical Otto Fuchs KG
Publication of EP3818187A1 publication Critical patent/EP3818187A1/fr
Application granted granted Critical
Publication of EP3818187B1 publication Critical patent/EP3818187B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • C22C21/10—Alloys based on aluminium with zinc as the next major constituent
    • 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
    • C22F1/053—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 zinc as the next major constituent

Definitions

  • the invention relates to an aluminum alloy, in particular one from the 7000 group according to the classification of the Aluminum Association (AA).
  • the invention further relates to an aged aluminum alloy product made from such an alloy.
  • high-strength aluminum alloys are required to manufacture, in particular, load-bearing fuselage, wing and landing gear parts that have high strength under both static and dynamic loads.
  • the required strength properties can be achieved by using alloys from the 7000 group in accordance with the classification of aluminum alloys made by the Aluminum Association (AA).
  • Highly stressed parts in the aerospace industry are used, for example, from the alloys AA7075, AA7175, AA7475 and particularly preferably from the alloys AA7049 and AA7050 in the American area and from the alloys AA7010, AA7049A and AA7050A in Europe.
  • WO 02/052053 A1 discloses a high-strength aluminum alloy of the aforementioned type with an increased zinc content compared to previous alloys of the same type, coupled with a reduced copper and magnesium content.
  • the copper and magnesium content in this known alloy together is less than 3.5% by weight.
  • the copper content itself is given at 1.2-2.2% by weight, preferably at 1.6-2.2% by weight.
  • this previously known alloy necessarily contains one or more elements from the group of zircon, scandium and hafnium with maximum proportions of 0.4% by weight of zirconium, 0.4% by weight of scandium and 0.3% by weight hafnium.
  • EP 1 683 882 A1 discloses a quench-insensitive aluminum alloy from which highly stressed parts, for example for use in aerospace technology, and thus components with high static and dynamic strength properties with good fracture toughness and good stress-crack corrosion behavior are produced , These components can also have a thickness of more than 200 mm.
  • This previously known alloy consists of: 7 to 10.5% by weight of Zn, 1.0 to 2.5% by weight of Mg, 0.1 to 1.15% by weight of Cu, 0.06 to 0.25 % By weight of Zr, 0.02 to 0.15% by weight of Ti as obligatory alloying elements, the total of the alloying elements Zn + Mg + Cu being at least 9% by weight and with a remainder of AI together with unavoidable impurities.
  • the semi-finished product made from this aluminum alloy is aged in one or more stages in order to optimize the desired material properties.
  • the fracture toughness determined in a neutral environment according to ASTM E399 on the semi-finished products made from this alloy is improved compared to the known prior art.
  • the relevant properties include the fracture toughness and, furthermore, the stress-crack corrosion resistance in an environment influenced by the environment (according to ASTM E1823: environment assisted cracking; EAC for short).
  • stress-crack corrosion is usually carried out in a salt water environment with the usual experimental setup to determine the stress-crack corrosion resistance (SRK resistance).
  • SRK resistance stress-crack corrosion resistance
  • a pre-notched sample for example ASTM G168-00
  • K factor decreases until the crack propagation finally stops.
  • the SRK resistance of aluminum alloys can be very different for one and the same alloy depending on the ambient conditions in which the SRK test is carried out. The condition of the aging of the semi-finished or test specimen also has an influence on the SRK resistance.
  • the SRK resistance increases significantly with increasing aging of the specimen starting from the T6 state via state T76 to state T74, in particular also in a salt water environment.
  • Other 7xxx alloys also show basically the same behavior in the classic SRK test (ie in salt water). With changed environmental conditions (eg high air humidity at elevated temperature) it can be seen that especially 7xxx alloys with a high zinc content tend to “environment assisted cracking” even when they are too old (ie T7x).
  • the crack propagation occurs due to hydrogen propagation - brittleness preferably along the grain boundaries (see e.g. EASA Safety Information Bulletin No. 2018-04).
  • the AA7010 can achieve KiEAc values between 6 and 7 MPaVm in the T6 state, but in the aged T74 state the KiEAc values rise to up to 25 MPaVm due to the aging in comparison to the T6 state significantly reduced strength.
  • the K-factor KIEAC is a measure of the EAC resistance, since there is no crack propagation for stresses Ki ⁇ KIEAC.
  • the alloy (AA7037) known from EP 1 683 882 A1, which is improved with respect to its strength properties compared to alloy AA7010, surprisingly does not show the expected EAC resistance with increasing aging, as is the case with a specimen made of alloy AA7010 watch is. Even in the aged T7452 state, the alloy according to AA 7037 can only achieve an EAC resistance of about KIEAC 6 to 7 MPaVm in a humid environment at elevated temperature (50 ° C, 85% relative air humidity).
  • the invention is therefore based on the object of proposing an aluminum alloy from which an aluminum alloy product with strength values comparable to that which an alloy product made from alloy AA7037 has, can be produced, but which has an improved EAC resistance under crack initiation and crack propagation-promoting environmental influences.
  • this object is achieved by an aluminum alloy with the following composition:
  • the fracture toughness is more than 20 MPaVrm and can reach values of 25 MPaVrm and more.
  • KIEAC stress intensity factors
  • An aluminum alloy product produced from the aluminum alloy according to the invention is preferably aged to the state T74, T7451, T7452 or T7454.
  • the aluminum alloy product still has sufficient mechanical strength values and the desired SRK resistance both in the classic immersion test in salt water solution and in a hydrogen-favoring EAC environment, such as in an environment with 85% humidity and temperature of 50 ° C.
  • higher mechanical strength values can be achieved, but the SRK / EAC resistance does not generally set to the desired extent.
  • this aluminum alloy contains 0.35 to 0.6% by weight of Ag, in particular 0.40 to 0.50% by weight of Ag.
  • the preferred Zn / Mg ratio is more than 3.4 up to and including 4.95.
  • a Zn-Mg ratio between 3.5 and 4.25 is preferred.
  • the preferred copper content of this alloy configuration is between 0.8 and 1.35% by weight of Cu, in particular between 0.9 and 1.2% by weight of Cu, combined with a Mn content between 0.18 and 0.
  • the alloy product has comparable alloy product properties if the Mn Content is less than 0.1% by weight, in particular less than 0.05% by weight.
  • These special properties - high strength values and a special EAC resistance - are also exhibited by an alloy with a lower Ag content compared to the embodiment described above, namely if it contains less than 0.35% by weight of Ag but more than 0 , 15% by weight.
  • the Cu and Zn content corresponds to the Ag-rich alloy, with the Zn / Mg ratio between 3.9 and 4.3.
  • Be can optionally participate in the alloy.
  • the introduction of Be into the melt serves to reduce its susceptibility to oxidation.
  • Be can be involved in the construction of the alloy between 0.0015 and 0.008, in particular in the range 0.0015 to 0.0035, for the purposes mentioned.
  • FIG. 1 E in a diagram to show the EAC resistance in the form the plateau crack speeds as well as the KiEAc resistance of a conventional AA7010 alloy with different aging or aging conditions
  • FIG. 2 a diagram to show the test results of a
  • Test specimens were produced from the comparison alloys and the test alloy, as follows:
  • Test alloys in% by weight are as follows:
  • the samples in state T7452 were subjected to an EAC test in accordance with ASTM E1681 using DCB samples in accordance with ASTM G168 in the present case at a relative atmospheric humidity of 85% and a temperature of 50 ° C.
  • the stresses on the samples provided with the crack were between 20 and 30 MPaVm at the start of the test.
  • the investigations regarding the EAC behavior on the DCB samples were carried out in an S-L orientation.
  • the KiEAc values thus refer to this orientation.
  • the S-L orientation is the direction in which a sample is most susceptible to an EAC-based failure.
  • the specimen is loaded in the ST direction of the forging (in the direction of the smallest expansion). A crack formation in the L direction (direction of greatest expansion) is therefore to be expected. Therefore, the EAC tests were carried out on S-L oriented samples.
  • FIG. 1 shows the influence of aging on the increase in the KiEAc values and the simultaneous drop in the initial crack propagation rate on the basis of the AA7010 alloy sample. While the KiEAc values in state T6 are low and do not meet the requirements (KIEAC of 5 MPaVm), the EAC resistance is improved with increasing aging. In state T7452, the KiEAc value is 24 MPaVm. However, the mechanical strength values of this alloy are only up to that State T76 acceptable and exhibit a fracture toughness Kic of about 21 MPaVm and a yield point R P o, 2 of 470 MPa. In the state T7452 Although the KiEAc value with 24 MPaVm is relatively high, as is the Kic value of about 32 MPaVm, however, the yield point R P o, 2 to 420 MPa is not sufficient.
  • the alloy AA7037 which has already been improved in terms of strength compared to alloy AA7010, shows sufficient mechanical strength values even in state T7452 with a yield strength R P o, 2 of 450 MPa and more and a fracture toughness Kic of approximately 30 MPaVm, but no EAC that meets the requirements -Resistance, see Figure 2.
  • the KiEAc value is about 6 MPaVm.
  • KiEAc values of more than 20 MPaVm are achieved with sample E1 from the alloy according to the invention, it being found for this sample that crack propagation occurs within the test period of 30 days could not be observed in the mentioned EAC environment.
  • the non-occurrence of crack propagation or crack propagation in the environment conducive to EAC is evident from the point accumulation of the different samples, which are only the result of scattering in the crack length measurements.
  • a typical stress-crack resistance behavior, which leads to crack propagation and fracture, can be seen in the diagram in FIG. 2 on the basis of the AA7037 alloy sample.
  • the yield point R P o, 2 is about 480 MPa for E1.
  • the fracture toughness Kic is about 26 MPaVm (SL sample layer).
  • FIG. 4 shows a diagram corresponding to that of FIG. 3 with the results of a sample of alloy E2. No crack propagation was observed in this sample either within the test period of 30 days. The EAC resistance is reflected in the KIEAC values of more than 35 MPaVm.
  • FIG. 5 shows a further diagram of the type mentioned above with the Ki EA c values of approximately 20 MPaVm obtained, which are obtained with four samples from the Alloy E4 have been achieved. No crack growth was found for this sample either within the test period of 30 days.
  • the Ki EA c values can also be seen from the diagram in FIG. 6 from four samples of the alloy according to the invention in accordance with E5. These are between approximately 22 to 26 MPaVrm. The accumulation of points in this diagram also shows that crack growth could not be observed within the duration of the test.
  • the strength values of the test specimens from the comparative alloys and those of the alloys E1-E6 according to the invention discussed above are summarized in the table below:

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  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Materials For Medical Uses (AREA)
  • Heat Treatment Of Steel (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Powder Metallurgy (AREA)

Abstract

L'invention concerne un alliage d'aluminium comprenant 0,04 à 0,1 % en poids de Si, 0,8 à 1,8 % en poids de Cu, 1,5 à 2,3 % en poids de Mg, 0,15 à 0,6 % en poids d'Ag, 7,05 à 9,2 % en poids de Zn, 0,08 à 0,14 % en poids de Zr, 0,02 à 0,08 % en poids de Ti, au plus 0,35 % en poids de Mn, au plus 0,1 % en poids de Fe, au plus 0,06 % en poids de Cr, éventuellement 0,0015 à 0,008 % en poids de Be, le reste étant de l'aluminium ainsi que des impuretés inévitables. L'invention concerne en outre un produit d'alliage d'aluminium, lequel est survieilli selon T74xx, qui est préparé à partir d'un tel alliage.
EP18743409.7A 2018-07-02 2018-07-02 Alliage d'aluminium et produit d'alliage d'aluminium survieilli obtenu à partir d'un tel alliage Active EP3818187B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2018/067740 WO2020007437A1 (fr) 2018-07-02 2018-07-02 Alliage d'aluminium et produit d'alliage d'aluminium survieilli obtenu à partir d'un tel alliage

Publications (2)

Publication Number Publication Date
EP3818187A1 true EP3818187A1 (fr) 2021-05-12
EP3818187B1 EP3818187B1 (fr) 2021-11-17

Family

ID=62981171

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18743409.7A Active EP3818187B1 (fr) 2018-07-02 2018-07-02 Alliage d'aluminium et produit d'alliage d'aluminium survieilli obtenu à partir d'un tel alliage

Country Status (7)

Country Link
US (1) US11970756B2 (fr)
EP (1) EP3818187B1 (fr)
JP (1) JP7321195B2 (fr)
CN (1) CN112218963B (fr)
ES (1) ES2902204T3 (fr)
RU (1) RU2765103C1 (fr)
WO (1) WO2020007437A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11879166B2 (en) 2018-11-12 2024-01-23 Novelis Koblenz Gmbh 7XXX-series aluminium alloy product

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113015816A (zh) * 2018-11-14 2021-06-22 奥科宁克技术有限责任公司 改进的7xxx铝合金

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2052000C3 (de) * 1970-10-23 1974-09-12 Fa. Otto Fuchs, 5882 Meinerzhagen Verwendung einer hochfesten Aluminiumlegierung
JP2915481B2 (ja) * 1990-04-19 1999-07-05 古河電気工業株式会社 耐応力腐食割れ性に優れた溶接構造材用高力アルミニウム合金
IL156386A0 (en) * 2000-12-21 2004-01-04 Alcoa Inc Aluminum alloy products and artificial aging method
RU2233902C1 (ru) * 2002-12-25 2004-08-10 Федеральное государственное унитарное предприятие "Всероссийский научно-исследовательский институт авиационных материалов" Высокопрочный сплав на основе алюминия и изделие, выполненное из этого сплава
ES2293813B2 (es) * 2003-04-10 2011-06-29 Corus Aluminium Walzprodukte Gmbh Una aleacion de al-zn-mg-cu.
RU2243278C1 (ru) * 2003-10-21 2004-12-27 Федеральное государственное унитарное предприятие "Всероссийский научно-исследовательский институт авиационных материалов" Сплав на основе алюминия и изделие, выполненное из него
DE502005001724D1 (de) 2005-01-19 2007-11-29 Fuchs Kg Otto Abschreckunempfindliche Aluminiumlegierung sowie Verfahren zum Herstellen eines Halbzeuges aus dieser Legierung
WO2009156283A1 (fr) * 2008-06-24 2009-12-30 Aleris Aluminum Koblenz Gmbh Produit d'alliage al-zn-mg avec une sensibilité à la trempe réduite
US20160348224A1 (en) * 2015-06-01 2016-12-01 Kaiser Aluminum Fabricated Products, Llc High Strength 7xxx Series Aluminum Alloy Products and Methods of Making Such Products
EP3294918B8 (fr) * 2016-08-04 2019-02-27 Indian Institute of Technology, Bombay Procédé de vieillissement thermique à quatre étapes pour l'amélioration de la résistance à la fissuration influencée par l'environnement d'alliages d'aluminium de série 7xxx

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11879166B2 (en) 2018-11-12 2024-01-23 Novelis Koblenz Gmbh 7XXX-series aluminium alloy product

Also Published As

Publication number Publication date
CN112218963A (zh) 2021-01-12
US11970756B2 (en) 2024-04-30
WO2020007437A1 (fr) 2020-01-09
JP2021534320A (ja) 2021-12-09
RU2765103C1 (ru) 2022-01-25
EP3818187B1 (fr) 2021-11-17
US20210164076A1 (en) 2021-06-03
JP7321195B2 (ja) 2023-08-04
ES2902204T3 (es) 2022-03-25
CN112218963B (zh) 2022-09-20

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