US20050238529A1 - Heat treatable Al-Zn-Mg alloy for aerospace and automotive castings - Google Patents

Heat treatable Al-Zn-Mg alloy for aerospace and automotive castings Download PDF

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Publication number
US20050238529A1
US20050238529A1 US11/111,585 US11158505A US2005238529A1 US 20050238529 A1 US20050238529 A1 US 20050238529A1 US 11158505 A US11158505 A US 11158505A US 2005238529 A1 US2005238529 A1 US 2005238529A1
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United States
Prior art keywords
aluminum alloy
concentration
less
shaped casting
alloy
Prior art date
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Abandoned
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US11/111,585
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English (en)
Inventor
Jen Lin
Cagatay Yanar
Michael Brandt
Xinyan Yan
Wenping Zhang
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Automotive Casting Technology Inc
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Individual
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Priority to US11/111,585 priority Critical patent/US20050238529A1/en
Priority to EP05743381A priority patent/EP1759028A4/en
Priority to MXPA06012242A priority patent/MXPA06012242A/es
Priority to PCT/US2005/013766 priority patent/WO2005106057A2/en
Priority to AU2005238478A priority patent/AU2005238478A1/en
Priority to JP2007509666A priority patent/JP2007534839A/ja
Priority to KR1020067024487A priority patent/KR20070009719A/ko
Priority to CA002564078A priority patent/CA2564078A1/en
Assigned to ALCOA INC. reassignment ALCOA INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BRANDT, MICHAEL K., LIN, JEN C., YAN, XINYAN, YANAR, CAGATAY, ZHANG, WENPING
Publication of US20050238529A1 publication Critical patent/US20050238529A1/en
Assigned to ALCOA INC. reassignment ALCOA INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BRANDT, MICHAEL K., LIN, JEN C., YAN, XINYAN, YANAR, CAGATAY, ZHANG, WENPING
Priority to NO20065386A priority patent/NO20065386L/no
Assigned to AUTOMOTIVE CASTING TECHNOLOGY, INC. reassignment AUTOMOTIVE CASTING TECHNOLOGY, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ALCOA INC.
Assigned to WACHOVIA BANK, NATIONAL ASSOCIATION, AS US AGENT reassignment WACHOVIA BANK, NATIONAL ASSOCIATION, AS US AGENT SECURITY AGREEMENT Assignors: AUTOMOTIVE CASTING TECHNOLOGY, INC.
Assigned to COMPASS AUTOMOTIVE FINCO, LLC reassignment COMPASS AUTOMOTIVE FINCO, LLC SECURITY AGREEMENT Assignors: AUTOMOTIVE CASTING TECHNOLOGY, INC.
Assigned to AUTOMOTIVE CASTING TECHNOLOGY, INC., NOW KNOWN AS SHIPSTON ALUMINUM TECHNOLOGIES (MICHIGAN), INC. reassignment AUTOMOTIVE CASTING TECHNOLOGY, INC., NOW KNOWN AS SHIPSTON ALUMINUM TECHNOLOGIES (MICHIGAN), INC. RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: WELLS FARGO BANK, NATIONAL ASSOCIATION, SUCCESSOR BY MERGER TO WACHOVIA BANK, NATIONAL ASSOCIATION, AS AGENT
Abandoned legal-status Critical Current

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    • 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

  • This invention is an aluminum alloy for aerospace and automotive shaped castings, castings comprised of the alloy, and methods of making cast components of the alloy.
  • Cast aluminum parts are used in structural applications in automobile suspensions to reduce weight.
  • the most commonly used group of alloys, Al—Si 7 —Mg has well established strength limits. In order to obtain lighter weight parts, higher strength material is needed with established material properties for design.
  • 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.
  • forged products are often used. These are usually more expensive than cast products. There exists the potential for considerable cost savings if cast products can be used to replace forged products with no loss of strength, elongation, corrosion resistance, fatigue strength, etc. This is true in both automotive and aerospace applications.
  • Casting alloys exhibiting higher tensile strength and fatigue resistance than the Al—Si 7 —Mg material are desirable. Such improvements could be used to reduce weight in new parts or in existing parts which can be redesigned to use the improved material properties to great advantage.
  • 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, V-mold, or sand mold casting with the following composition ranges (all in weight percent):
  • 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. In other applications, manganese is to be avoided.
  • 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 purpose of the present invention is to provide a range of aluminum alloys having good strength, good castability for forming shaped castings, good corrosion resistance and good thermal shock resistance.
  • a fine grain size is often desirable for strength and for appearance, particularly for components which are anodized and then coated with a clear finish layer.
  • the present invention is an aluminum alloy including from about 3.5-5.5% Zn, from about 0.8-1.5% Mg. It contains less than about 1% Si, less than about 0.30% Mn; and less than 0.30% Fe and other incidental impurities.
  • the present invention is a heat treatable shaped casting of an aluminum alloy including from about 3.5-5.5% Zn, from about 0.8-1.5% Mg, and less than about 1% Si, less than about 0.30% Mn, and less than 0.30% Fe and other incidental impurities.
  • 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 0.8-1.5% Mg, and less than about 1% Si, less than about 0.30% Mn, and less than 0.30% Fe and other incidental impurities.
  • 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.
  • the figure presents the results of ASTM G44 stress corrosion test on Al—Zn—Mg alloys with and without copper.
  • any numerical range of values herein are understood to include each and every number and/or fraction between the stated range minimum and maximum.
  • a range of about 3.5 to 5.5 wt % zinc, for example, would expressly include all intermediate values of about 3.6, 3.7, 3.8 and 3.9%, all the way up to and including 5.3, 5.35, 5.4, 5.475 and 5.499% Zn.
  • the first alloy shown in Table 1 was Al-4.5Zn-1.2Mg. Two samples were tested, each in T5 and T6 tempers. The tensile strength and yield strength are presented in megapascals, and the elongation in percent is presented, for two samples of the alloy, in both T5 and T6 tempers. This alloy is an example of the present invention.
  • the second alloy shown in Table 1 also has a composition in the range of the present invention. It contains Al-4.5Zn-1.2Mg-0.4Si. This shows lower values for tensile and yield strength than the previous alloy in T5 temper. However, it has significantly higher values for tensile strength, yield strength and elongation in T6 temper than did the previous alloy.
  • the third alloy shown in Table 1 is not within the composition range of the present invention. It is presented for comparison.
  • the third alloy has higher values for tensile and yield strength and higher elongation values in T5 temper than the second alloy in T5 temper, but lower values for tensile and yield strength and lower value for elongation than the second alloy in T6 temper.
  • the fourth alloy shown in Table 1 is also not within the composition range of the present invention. It, also, is presented for comparison. The data presented illustrate the effect of zirconium, probably for preventing grain growth. The results for the T6 temper show very high values for tensile strength, yield strength and elongation.
  • composition for the first plant trial was Al-3.5Zn-0.97Mg.
  • the table presents tensile strength and yield strength in megapascals, as well as elongation in percent. Two samples were tested in T5 temper, and two samples of the as-cast material were tested. It is noted that the elongation for the as-cast material had the extraordinary values of 15.03 and 15.95%.
  • Table 3 The data in Table 3 are for an alloy containing Al-3.5 Zn-1.1 Mg. This is an alloy according to the present invention. Data are presented for three different heat treatments. The first was 160° C. for 1 hour, the second was 160° C. for six hours and the third was 143° C. for 32 hours. The tensile strength and yield strength values in this table are expressed in megapascals, and the elongation is expressed in percent.
  • Table 4 presents data for the same alloy as the samples in Table 3.
  • the samples reported in Table 4 were subjected to a T6 heat treatment that consisted of 471° C. for 3 hours, and then 527° C. for 10 hours followed by cold water quench.
  • the samples were than aged as reported in Table 4, and the stress results in Table 4 were then obtained.
  • the first line in the table is for a sample which was naturally aged only.
  • Corrosion tests were also performed employing the ASTM G44 test which is the “Standard Practice for Exposure of Metals and Alloys by Alternate Immersion in Neutral 3.5% Sodium Chloride Solution”.
  • ASTM G44 test is the “Standard Practice for Exposure of Metals and Alloys by Alternate Immersion in Neutral 3.5% Sodium Chloride Solution”.
  • stressed specimens are subjected to a 1-hour cycle which includes immersion in 3.5% NaCl solution for 10 minutes and then in lab air for 50 minutes. The samples were stressed at 75% of their yield strength, and the test was run for 180 days.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Continuous Casting (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Body Structure For Vehicles (AREA)
US11/111,585 2004-04-22 2005-04-21 Heat treatable Al-Zn-Mg alloy for aerospace and automotive castings Abandoned US20050238529A1 (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
US11/111,585 US20050238529A1 (en) 2004-04-22 2005-04-21 Heat treatable Al-Zn-Mg alloy for aerospace and automotive castings
KR1020067024487A KR20070009719A (ko) 2004-04-22 2005-04-22 항공우주선 및 자동차 주물용 열 처리가능한Ａｌ-Ｚｎ-Ｍｇ 합금
CA002564078A CA2564078A1 (en) 2004-04-22 2005-04-22 Heat treatable al-zn-mg alloy for aerospace and automotive castings
MXPA06012242A MXPA06012242A (es) 2004-04-22 2005-04-22 Aleacion termotratable de al-zn-mg para piezas aeroespaciales y automotrices moldeadas por vaciado.
PCT/US2005/013766 WO2005106057A2 (en) 2004-04-22 2005-04-22 Heat treatable al-zn-mg alloy for aerospace and automotive castings
AU2005238478A AU2005238478A1 (en) 2004-04-22 2005-04-22 Heat treatable AL-ZN-MG alloy for aerospace and automotive castings
JP2007509666A JP2007534839A (ja) 2004-04-22 2005-04-22 航空宇宙及び自動車の鋳物品用の熱処理可能なＡｌ−Ｚｎ−Ｍｇ合金
EP05743381A EP1759028A4 (en) 2004-04-22 2005-04-22 Heat treatable al-zn-mg alloy for aerospace and automotive castings
NO20065386A NO20065386L (no) 2004-04-22 2006-11-22 Varmebehandlet Al-Zn-Mg-legering for stopegods for luftfarts- og kjoretoyindustrien

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US56481304P 2004-04-22 2004-04-22
US11/111,585 US20050238529A1 (en) 2004-04-22 2005-04-21 Heat treatable Al-Zn-Mg alloy for aerospace and automotive castings

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US20050238529A1 true US20050238529A1 (en) 2005-10-27

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US11/111,585 Abandoned US20050238529A1 (en) 2004-04-22 2005-04-21 Heat treatable Al-Zn-Mg alloy for aerospace and automotive castings

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US (1) US20050238529A1 (enExample)
EP (1) EP1759028A4 (enExample)
JP (1) JP2007534839A (enExample)
KR (1) KR20070009719A (enExample)
AU (1) AU2005238478A1 (enExample)
CA (1) CA2564078A1 (enExample)
MX (1) MXPA06012242A (enExample)
NO (1) NO20065386L (enExample)
WO (1) WO2005106057A2 (enExample)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060289093A1 (en) * 2005-05-25 2006-12-28 Howmet Corporation Al-Zn-Mg-Ag high-strength alloy for aerospace and automotive castings
EP1978120A1 (de) * 2007-03-30 2008-10-08 Technische Universität Clausthal Aluminium-Silizium-Gussleglerung und Verfahren zu Ihrer Herstellung
US8083871B2 (en) 2005-10-28 2011-12-27 Automotive Casting Technology, Inc. High crashworthiness Al-Si-Mg alloy and methods for producing automotive casting
EP2295608A4 (en) * 2008-06-11 2012-08-08 Asturiana De Aleaciones S A ALUMINUM GRAIN REFINER
US8349462B2 (en) 2009-01-16 2013-01-08 Alcoa Inc. Aluminum alloys, aluminum alloy products and methods for making the same
US20130284322A1 (en) * 2010-12-14 2013-10-31 Constellium Valais Sa (Ag, Ltd) Thick products made of 7xxx alloy and manufacturing process
DE102014224229A1 (de) 2014-11-27 2016-06-02 Federal-Mogul Nürnberg GmbH Verfahren zur Herstellung eines Motorbauteils, Motorbauteil und Verwendung einer Aluminiumlegierung
CN114214547A (zh) * 2021-09-30 2022-03-22 中国航发北京航空材料研究院 一种铝锌镁钪合金及其制备方法
US11345980B2 (en) 2018-08-09 2022-05-31 Apple Inc. Recycled aluminum alloys from manufacturing scrap with cosmetic appeal

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1683882B2 (de) 2005-01-19 2010-07-21 Otto Fuchs KG Abschreckunempfindliche Aluminiumlegierung sowie Verfahren zum Herstellen eines Halbzeuges aus dieser Legierung
US10597762B2 (en) * 2013-09-30 2020-03-24 Apple Inc. Aluminum alloys with high strength and cosmetic appeal

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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

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US3616420A (en) * 1968-11-25 1971-10-26 British Aluminium Co Ltd Aluminium base alloys and anodes
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

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060289093A1 (en) * 2005-05-25 2006-12-28 Howmet Corporation Al-Zn-Mg-Ag high-strength alloy for aerospace and automotive castings
US8721811B2 (en) 2005-10-28 2014-05-13 Automotive Casting Technology, Inc. Method of creating a cast automotive product having an improved critical fracture strain
US8083871B2 (en) 2005-10-28 2011-12-27 Automotive Casting Technology, Inc. High crashworthiness Al-Si-Mg alloy and methods for producing automotive casting
US9353430B2 (en) 2005-10-28 2016-05-31 Shipston Aluminum Technologies (Michigan), Inc. Lightweight, crash-sensitive automotive component
EP1978120A1 (de) * 2007-03-30 2008-10-08 Technische Universität Clausthal Aluminium-Silizium-Gussleglerung und Verfahren zu Ihrer Herstellung
EP2295608A4 (en) * 2008-06-11 2012-08-08 Asturiana De Aleaciones S A ALUMINUM GRAIN REFINER
US8950465B2 (en) 2009-01-16 2015-02-10 Alcoa Inc. Aluminum alloys, aluminum alloy products and methods for making the same
US8349462B2 (en) 2009-01-16 2013-01-08 Alcoa Inc. Aluminum alloys, aluminum alloy products and methods for making the same
US20130284322A1 (en) * 2010-12-14 2013-10-31 Constellium Valais Sa (Ag, Ltd) Thick products made of 7xxx alloy and manufacturing process
KR101900973B1 (ko) 2010-12-14 2018-09-20 콩스텔리움 이수와르 7xxx 합금으로 제조된 두꺼운 제품 및 제조 방법
US11306379B2 (en) * 2010-12-14 2022-04-19 Constellium Valais Sa (Ag, Ltd) Thick products made of 7XXX alloy and manufacturing process
US12252771B2 (en) 2010-12-14 2025-03-18 Constellium Issoire Thick products made of 7XXX alloy and manufacturing process
DE102014224229A1 (de) 2014-11-27 2016-06-02 Federal-Mogul Nürnberg GmbH Verfahren zur Herstellung eines Motorbauteils, Motorbauteil und Verwendung einer Aluminiumlegierung
US11345980B2 (en) 2018-08-09 2022-05-31 Apple Inc. Recycled aluminum alloys from manufacturing scrap with cosmetic appeal
CN114214547A (zh) * 2021-09-30 2022-03-22 中国航发北京航空材料研究院 一种铝锌镁钪合金及其制备方法

Also Published As

Publication number Publication date
KR20070009719A (ko) 2007-01-18
EP1759028A4 (en) 2007-10-03
AU2005238478A1 (en) 2005-11-10
WO2005106057A3 (en) 2006-01-26
JP2007534839A (ja) 2007-11-29
NO20065386L (no) 2007-01-12
WO2005106057A2 (en) 2005-11-10
EP1759028A2 (en) 2007-03-07
CA2564078A1 (en) 2005-11-10
MXPA06012242A (es) 2007-01-31

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