EP1759027A2 - Alliage al-zn-mg-cu a traitement thermique utilise pour des pieces coulees destinees a des applications dans le domaine de l'aerospatiale et de l'automobile - Google Patents

Alliage al-zn-mg-cu a traitement thermique utilise pour des pieces coulees destinees a des applications dans le domaine de l'aerospatiale et de l'automobile

Info

Publication number
EP1759027A2
EP1759027A2 EP05738780A EP05738780A EP1759027A2 EP 1759027 A2 EP1759027 A2 EP 1759027A2 EP 05738780 A EP05738780 A EP 05738780A EP 05738780 A EP05738780 A EP 05738780A EP 1759027 A2 EP1759027 A2 EP 1759027A2
Authority
EP
European Patent Office
Prior art keywords
aluminum alloy
concentration
alloy
shaped casting
copper
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.)
Withdrawn
Application number
EP05738780A
Other languages
German (de)
English (en)
Other versions
EP1759027A4 (fr
Inventor
Jen C. Lin
Cagatay Yanar
Michael K. Brandt
Xinyan Yan
Wenping Zhang
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.)
Howmet Aerospace Inc
Original Assignee
Alcoa Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Alcoa Inc filed Critical Alcoa Inc
Publication of EP1759027A2 publication Critical patent/EP1759027A2/fr
Publication of EP1759027A4 publication Critical patent/EP1759027A4/fr
Withdrawn legal-status Critical Current

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

Definitions

  • the most commonly used group of alloys Al-Si 7 -Mg
  • cast materials made of A356.0, the most commonly used Al-Si 7 -Mg alloy can reliably guarantee ultimate tensile strength of 290 MPa (42,060 psi), and tensile yield strength of 220 MPa (31,908 psi) with elongations of 8% or greater.
  • a variety of alternate alloys exist and are registered that exhibit higher strength than the Al-Si 7 -Mg alloys. However, these exhibit problems in castability, corrosion potential or fluidity that are not readily overcome. The alternate alloys are therefore less suitable for use.
  • the alloy of the present invention is an Al-Zn-Mg base alloy for low pressure permanent or semi-permanent mold, squeeze, high pressure die, pressure or gravity casting, lost foam, investment casting, N-mold, or sand mold casting with the following composition ranges (all in weight percent): Zn: about 3.5-5.5%, Mg: about 1-3%, Cu: about 0.05-0.5%, Si: less than about 1.0%, Fe and other incidental impurities: less than about 0.30%, Mn: less than about 0.30%. [0008] Silicon up to about 1.0% may be employed to improve castability. Lower levels of silicon may be employed to increase strength. For some applications, manganese up to about 0.3%) may be employed to improve castability.
  • the alloy may also contain grain refiners such as titanium diboride, TiB 2 or titanium carbide, TiC and/or anti-recrystallization agents such as zirconium or scandium. If titanium diboride is employed as a grain refiner, the concentration of boron in the alloy may be in a range from 0.0025% to 0.05%. Likewise, if titanium carbide is employed as a grain refiner, the concentration of carbon in the alloy may be in the range from 0.0025% to 0.05%. Typical grain refiners are aluminum alloys containing TiC or TiB 2 .
  • Zirconium if used to prevent grain growth during solution heat treatment, is generally employed in a range below 0.2%. Scandium may also be used in a range below 0.3%.
  • the alloy demonstrated 50%o higher tensile yield strength than is obtainable from A356.0-T6, while maintaining similar elongations. This will allow part designs requiring higher strength than alloys which are readily available today in Al-Si-Mg alloys such as A356.0-T6 or A357.0-T6. Fatigue performance in the T6 temper is increased over the A356.0-T6 material by 30%.
  • the present invention is an aluminum alloy including from about 3.5-5.5% Zn, from about l-3%Mg, about 0.05-0.5% Cu and it contains less than about 1% Si.
  • the present invention is a heat treatable shaped casting of an aluminum alloy including from about 3.5-5.5% Zn, from about 1-3% Mg, from about 0.05- 0.5%) Cu, and less than aboutl% Si.
  • the present invention is a method of preparing a heat treatable aluminum alloy shaped casting.
  • the method includes preparing a molten mass of an aluminum alloy including from about 3.5-5.5% Zn, from about 1-3% Mg, from about 0.05- 0.5%) Cu, and less than about 1% Si.
  • the method further includes casting at least a portion of the molten mass in a mold configured to produce the shaped casting, permitting the molten mass to solidify, and removing the shaped casting from the mold.
  • Figure 1 is a photograph of a cut surface of a cut sample of prior art A356.0 alloy cast in a shrinkage mold showing the shrinkage cracking tendency of the prior art A356.0 alloy
  • Figure 2 is a photograph, similar to Figure 1, of a cut surface of a second sample of prior art A356.0 cast in a shrinkage mold showing the shrinkage cracking tendency of the prior art A356.0 alloy
  • Figure 3 is a photograph of a cut surface of a sample of the alloy of the present invention cast in a shrinkage mold showing a lack of shrinkage cracking
  • Figure 4 is a photograph, similar to Figure 3, of a cut surface of a second sample of the alloy of the present invention cast in a shrinkage mold showing a lack of shrinkage cracking
  • Figure 5 presents strength and elongation data for directionally solidified samples of the present invention in T6 condition
  • Figure 6 is a photograph of a front knuckle casting of an alloy according
  • Table II presents room temperature mechanical properties of the directionally solidified alloys having the compositions shown in the first and third data lines of Table I.
  • the first data line in Table II is for a directionally solidified casting comprised of the alloy of the first data line in Table I after five weeks of natural ageing.
  • the second data line in Table 2 is for the same alloy after T5 heat treatment, and the third data line is for that alloy after T6 heat treatment.
  • the fourth and fifth data lines in Table II are for the alloy in the bottom line of Table 1, which is a high copper alloy. This alloy, also, was subjected to a T6 heat treatment.
  • Table III presents data for front knuckle castings as shown in Fig. 6. This is an alloy according to the present invention, and has the composition presented in the second data row in Table 1. The locations of tensile test samples 1, 2 and 3 are indicated in Fig. 6. Tests were performed on one casting subjected to a T5 heat treatment consisting of 160 °C for 6 hours, and one casting subjected to a T6 heat treatment consisting of solution heat treatment at 554 °C for 8 hours followed by a cold water quench, then by artificial ageing at 121 °C for 6 hours and 160 °C for 6 hours. Table HI: CS front knuckle room temperature mechanical properties
  • Figure 9 is a graph showing staircase fatigue testing of the alloy of the present invention in T6 condition compared to the response of the prior art alloy, A356.0-T6 with a calculated mean value for A356.0-T6.
  • the composition of the alloy of the present invention was as presented in the second data row of Table 1.
  • the samples were solution heat treated at 526 °C or 554 °C, quenched and artificially aged at 160 °C for 6 hours. As seen earlier, the fatigue response of these samples is appreciably improved when compared to A356.0-T6 material.
  • the mean fatigue strength of the alloy of the present invention was 109.33 MPa with a standard deviation of 9.02 MPa. The standard deviation of the mean fatigue strength was 3.01 MPa.
  • the calculated mean fatigue strength at 10 7 cycles of A356.0 T6 is 70MPa.
  • Corrosion resistance of the alloy of the present invention was tested using the ASTM Gl 10 corrosion test, which is the "Standard Practice for Evaluating Intergranular Corrosion Resistance of Heat Treatable Aluminum Alloys by Immersion in Sodium Chloride + Hydrogen Peroxide Solution".
  • ASTM Gl 10 corrosion test which is the "Standard Practice for Evaluating Intergranular Corrosion Resistance of Heat Treatable Aluminum Alloys by Immersion in Sodium Chloride + Hydrogen Peroxide Solution”.
  • specimens are immersed in a solution that contains 57g/L NaCl and 10 mL L H 2 O 2 (30%) for 6-24 hours. The specimens are then cross-sectioned and examined under optical microscope for type (intergranular corrosion or pitting) and depth of corrosion attack.
  • Figure 10 is a graph presenting the depth of attack following the ASTM Gl 10 corrosion test after 6 hours and 24 hours for an alloy according to the present invention and for the alloy A356.0.
  • Figures 11 and 12 are photomicrographs of an alloy according to the present invention after 24 hours exposure to the ASTM Gl 10 corrosion test. Nery little intergranular corrosion can be seen in these photomicrographs.
  • Figure 13 is a photomicrograph of the A356.0 alloy after 24 hours of exposure to the ASTM Gl 10 corrosion test. Considerable intergranular corrosion can be seen in this photomicrograph.
  • Table V presents the test results for the alloy compositions presented in Table IN.
  • Table V ASTM G44 test of alloys with various Mg and Cu contents
  • Figure 14 is a graph presenting the results of these tests. It is seen that, for alloys of the present invention, and at these high magnesium levels, increasing copper provides increased resistance to stress corrosion cracking.
  • Figure 15 is a graph showing the effect of copper and magnesium levels on stress corrosion cracking for alloys of the present invention. This shows that for alloys according to the present invention which have magnesium in the range from 1.5-2%, it is desirable to include copper in the range from 0.25-0.3%.
  • Table VI and VH present the results of plant trials in which repeated shots were made from a single liquid metal reservoir. One trial was performed on April 4; one was performed on June 4 and one on September 4. On each day, the composition for all the castings made varied very little.
  • Table VI presents the ranges of the compositions of samples taken on each of the test days. The compositions contained high levels of magnesium and copper, which were expected to provide exceptionally high strength levels.
  • Table VII presents the stress data, ultimate tensile strength, tensile yield strength, and elongation for four different locations in each casting.
  • the column for sample numbers labels the individual castings.
  • the column for location defines individual mechanical test samples cut from the castings.

Abstract

Un alliage d'aluminium à traitement thermique utilisé pour des pièces coulées façonnées comprend entre environ 3,5 et 5,5 % de Zn, entre environ 1 et 3 % de Mg, entre environ 0,05 et 0,5 % de Cu et moins d'environ 1 % de Si.
EP05738780A 2004-04-22 2005-04-22 Alliage al-zn-mg-cu a traitement thermique utilise pour des pieces coulees destinees a des applications dans le domaine de l'aerospatiale et de l'automobile Withdrawn EP1759027A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US56481304P 2004-04-22 2004-04-22
US11/111,212 US20050238528A1 (en) 2004-04-22 2005-04-21 Heat treatable Al-Zn-Mg-Cu alloy for aerospace and automotive castings
PCT/US2005/013769 WO2005106058A2 (fr) 2004-04-22 2005-04-22 Alliage al-zn-mg-cu a traitement thermique utilise pour des pieces coulees destinees a des applications dans le domaine de l'aerospatiale et de l'automobile

Publications (2)

Publication Number Publication Date
EP1759027A2 true EP1759027A2 (fr) 2007-03-07
EP1759027A4 EP1759027A4 (fr) 2007-10-03

Family

ID=35136635

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05738780A Withdrawn EP1759027A4 (fr) 2004-04-22 2005-04-22 Alliage al-zn-mg-cu a traitement thermique utilise pour des pieces coulees destinees a des applications dans le domaine de l'aerospatiale et de l'automobile

Country Status (9)

Country Link
US (1) US20050238528A1 (fr)
EP (1) EP1759027A4 (fr)
JP (1) JP2007534840A (fr)
KR (1) KR20070004987A (fr)
AU (1) AU2005238479A1 (fr)
CA (1) CA2564080A1 (fr)
MX (1) MXPA06012243A (fr)
NO (1) NO20065387L (fr)
WO (1) WO2005106058A2 (fr)

Families Citing this family (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1683882B2 (fr) 2005-01-19 2010-07-21 Otto Fuchs KG Alliage d'Aluminium avec sensitivité à la trempe réduite et procédé de fabrication d'un produit demi-final lors de cet alliage
US20060289093A1 (en) * 2005-05-25 2006-12-28 Howmet Corporation Al-Zn-Mg-Ag high-strength alloy for aerospace and automotive castings
US8157932B2 (en) * 2005-05-25 2012-04-17 Alcoa Inc. Al-Zn-Mg-Cu-Sc high strength alloy for aerospace and automotive castings
US8083871B2 (en) 2005-10-28 2011-12-27 Automotive Casting Technology, Inc. High crashworthiness Al-Si-Mg alloy and methods for producing automotive casting
US20080066833A1 (en) * 2006-09-19 2008-03-20 Lin Jen C HIGH STRENGTH, HIGH STRESS CORROSION CRACKING RESISTANT AND CASTABLE Al-Zn-Mg-Cu-Zr ALLOY FOR SHAPE CAST PRODUCTS
JP2011510174A (ja) * 2008-01-16 2011-03-31 ケステック イノベーションズ エルエルシー 熱間割れに耐性のある高強度アルミニウム鋳造合金
US8349462B2 (en) 2009-01-16 2013-01-08 Alcoa Inc. Aluminum alloys, aluminum alloy products and methods for making the same
WO2013105831A1 (fr) * 2012-01-12 2013-07-18 한국생산기술연구원 Alliage al-zn à haute conductivité thermique pour coulée sous pression
US9315885B2 (en) * 2013-03-09 2016-04-19 Alcoa Inc. Heat treatable aluminum alloys having magnesium and zinc and methods for producing the same
WO2015048788A1 (fr) 2013-09-30 2015-04-02 Apple Inc. Alliages d'aluminium à haute résistance et ayant un côté esthétique
CN106255771B (zh) 2014-04-30 2019-11-12 美铝美国公司 改善的7xx铝铸造合金及其制备方法
US10030292B2 (en) 2014-05-26 2018-07-24 Hrl Laboratories, Llc Hydride-coated microparticles and methods for making the same
CN107075619B (zh) 2014-08-27 2018-10-30 奥科宁克公司 具有锰、锌和锆的改进的铝铸造合金
US10648082B1 (en) 2014-09-21 2020-05-12 Hrl Laboratories, Llc Metal-coated reactive powders and methods for making the same
US10682699B2 (en) 2015-07-15 2020-06-16 Hrl Laboratories, Llc Semi-passive control of solidification in powdered materials
CN106868361A (zh) 2015-12-10 2017-06-20 华为技术有限公司 铝合金材料及应用该铝合金材料的外壳
US10208371B2 (en) 2016-07-13 2019-02-19 Apple Inc. Aluminum alloys with high strength and cosmetic appeal
US10865464B2 (en) 2016-11-16 2020-12-15 Hrl Laboratories, Llc Materials and methods for producing metal nanocomposites, and metal nanocomposites obtained therefrom
US10960497B2 (en) 2017-02-01 2021-03-30 Hrl Laboratories, Llc Nanoparticle composite welding filler materials, and methods for producing the same
US11286543B2 (en) 2017-02-01 2022-03-29 Hrl Laboratories, Llc Aluminum alloy components from additive manufacturing
US11117193B2 (en) 2017-02-01 2021-09-14 Hrl Laboratories, Llc Additive manufacturing with nanofunctionalized precursors
US11578389B2 (en) 2017-02-01 2023-02-14 Hrl Laboratories, Llc Aluminum alloy feedstocks for additive manufacturing
US11052460B2 (en) 2017-02-01 2021-07-06 Hrl Laboratories, Llc Methods for nanofunctionalization of powders, and nanofunctionalized materials produced therefrom
US20190032175A1 (en) * 2017-02-01 2019-01-31 Hrl Laboratories, Llc Aluminum alloys with grain refiners, and methods for making and using the same
US11674204B2 (en) 2017-02-01 2023-06-13 Hrl Laboratories, Llc Aluminum alloy feedstocks for additive manufacturing
US11396687B2 (en) 2017-08-03 2022-07-26 Hrl Laboratories, Llc Feedstocks for additive manufacturing, and methods of using the same
US11779894B2 (en) 2017-02-01 2023-10-10 Hrl Laboratories, Llc Systems and methods for nanofunctionalization of powders
EP3704279A4 (fr) 2017-10-31 2021-03-10 Howmet Aerospace Inc. Alliages d'aluminium améliorés et leurs procédés de production
US11345980B2 (en) 2018-08-09 2022-05-31 Apple Inc. Recycled aluminum alloys from manufacturing scrap with cosmetic appeal
US11865641B1 (en) 2018-10-04 2024-01-09 Hrl Laboratories, Llc Additively manufactured single-crystal metallic components, and methods for producing the same

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2240940A (en) * 1940-09-28 1941-05-06 Aluminum Co Of America Aluminum alloy
DE900499C (de) * 1941-01-12 1953-12-28 Ver Deutsche Metallwerke Ag Verguetbare korrosionsbestaendige Aluminium-Zink-Magnesium-Knetlegierungen
FR1343246A (fr) * 1962-12-26 1963-11-15 Ver Leichtmetallwerke Gmbh Emploi d'un alliage malléable d'aluminium, à teneur en cuivre faible ou nulle
CH498201A (de) * 1966-04-07 1970-10-31 High Duty Alloys Ltd Verfahren zur Wärmebehandlung geschmiedeter oder stranggepresster Aluminiumlegierungen
GB1218516A (en) * 1968-12-27 1971-01-06 Aluminum Co Of America Clad aluminum base alloy
US3694272A (en) * 1970-12-24 1972-09-26 Kaiser Aluminium Chem Corp Method for forming aluminum sheet
US3945861A (en) * 1975-04-21 1976-03-23 Aluminum Company Of America High strength automobile bumper alloy
WO1992003586A1 (fr) * 1990-08-22 1992-03-05 Comalco Aluminium Limited Alliage convenant a la fabrication de cannettes
EP1229141A1 (fr) * 2001-02-05 2002-08-07 ALUMINIUM RHEINFELDEN GmbH Alliage d'aluminium de fonderie
WO2004044256A1 (fr) * 2002-11-06 2004-05-27 Pechiney Rhenalu PROCEDE DE FABRICATION SIMPLIFIE DE PRODUITS LAMINES EN ALLIAGES Al-Zn-Mg, ET PRODUITS OBTENUS PAR CE PROCEDE

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5383913A (en) * 1976-12-29 1978-07-24 Kobe Steel Ltd Al-zn-mg cast alloy for welded structure
JPS62250149A (ja) * 1986-04-24 1987-10-31 Kobe Steel Ltd 自転車用アルミニウム合金
US4873054A (en) * 1986-09-08 1989-10-10 Kb Alloys, Inc. Third element additions to aluminum-titanium master alloys
US20010028861A1 (en) * 1997-12-17 2001-10-11 Que-Tsang Fang High strength Al-Zn-Mg alloy for making shaped castings including vehicle wheels and structural components
US7045094B2 (en) * 2000-12-12 2006-05-16 Andrei Anatolyevich Axenov Aluminum-based material and a method for manufacturing products from aluminum-based material

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2240940A (en) * 1940-09-28 1941-05-06 Aluminum Co Of America Aluminum alloy
DE900499C (de) * 1941-01-12 1953-12-28 Ver Deutsche Metallwerke Ag Verguetbare korrosionsbestaendige Aluminium-Zink-Magnesium-Knetlegierungen
FR1343246A (fr) * 1962-12-26 1963-11-15 Ver Leichtmetallwerke Gmbh Emploi d'un alliage malléable d'aluminium, à teneur en cuivre faible ou nulle
CH498201A (de) * 1966-04-07 1970-10-31 High Duty Alloys Ltd Verfahren zur Wärmebehandlung geschmiedeter oder stranggepresster Aluminiumlegierungen
GB1218516A (en) * 1968-12-27 1971-01-06 Aluminum Co Of America Clad aluminum base alloy
US3694272A (en) * 1970-12-24 1972-09-26 Kaiser Aluminium Chem Corp Method for forming aluminum sheet
US3945861A (en) * 1975-04-21 1976-03-23 Aluminum Company Of America High strength automobile bumper alloy
WO1992003586A1 (fr) * 1990-08-22 1992-03-05 Comalco Aluminium Limited Alliage convenant a la fabrication de cannettes
EP1229141A1 (fr) * 2001-02-05 2002-08-07 ALUMINIUM RHEINFELDEN GmbH Alliage d'aluminium de fonderie
WO2004044256A1 (fr) * 2002-11-06 2004-05-27 Pechiney Rhenalu PROCEDE DE FABRICATION SIMPLIFIE DE PRODUITS LAMINES EN ALLIAGES Al-Zn-Mg, ET PRODUITS OBTENUS PAR CE PROCEDE

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
HUFNAGEL W: "Key to Aluminium Alloys, 4th Edition" ALUMINIUM-SCHLUESSEL = KEY TO ALUMINIUM ALLOYS, 1991, pages 195-205, XP002194851 *
See also references of WO2005106058A2 *

Also Published As

Publication number Publication date
AU2005238479A1 (en) 2005-11-10
US20050238528A1 (en) 2005-10-27
WO2005106058A2 (fr) 2005-11-10
NO20065387L (no) 2007-01-17
JP2007534840A (ja) 2007-11-29
KR20070004987A (ko) 2007-01-09
MXPA06012243A (es) 2007-01-31
EP1759027A4 (fr) 2007-10-03
WO2005106058A3 (fr) 2006-09-14
CA2564080A1 (fr) 2005-11-10

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