HIGH STRENGTH, HIGH STRESS CORROSION CRACKING RESISTANT AND CASTABLE Al-Zn-Mg-Cu-Zr ALLOY FOR SHAPE CAST PRODUCTS

Inactive Publication Date: 2008-03-20
AUTOMOTIVE CASTING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0030]The inventive Al—Zn—Mg—Cu alloy and method of producing a shaped casting in addition to providing levels of strength and corrosion performance that wer

Problems solved by technology

Forged products are disadvantageously more expensive than cast products.
However these exhibit problems in castability, corrosion performance or fluidity, which are not readily overcome.
While the Al—Zn—Mg—Cu alloy disclosed in U.S. patent application Ser. N

Method used

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  • HIGH STRENGTH, HIGH STRESS CORROSION CRACKING RESISTANT AND CASTABLE Al-Zn-Mg-Cu-Zr ALLOY FOR SHAPE CAST PRODUCTS
  • HIGH STRENGTH, HIGH STRESS CORROSION CRACKING RESISTANT AND CASTABLE Al-Zn-Mg-Cu-Zr ALLOY FOR SHAPE CAST PRODUCTS
  • HIGH STRENGTH, HIGH STRESS CORROSION CRACKING RESISTANT AND CASTABLE Al-Zn-Mg-Cu-Zr ALLOY FOR SHAPE CAST PRODUCTS

Examples

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Example

[0040]The present invention provides an Al—Zn—Mg—Cu alloy having yield strengths, fatigue strength, general corrosion performance, and stress corrosion cracking (SCC) performance suitable for automotive and aerospace applications, while maintaining castability. All component percentages herein are by weight percent unless otherwise indicated. When referring to any numerical range of values, such ranges are understood to include each and every number and / or fraction between the stated range minimum and maximum. A range of about 0.5-1.2 wt. % Cu, for example, would expressly include all intermediate values of about 0.6, 0.7, 0.8 and all the way up to and including 1.1 wt. % Cu. As used herein, the term “incidental impurities” refers to elements that are not purposeful additions to the alloy, but that due to impurities and / or leaching from contact with manufacturing equipment, trace quantities of such elements being no greater than 0.05 wt. % that may, nevertheless, find their way into...

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Abstract

The present invention provides an Al—Zn—Mg—Cu casting alloy that provides high strength for automotive and aerospace applications and optimized stress corrosion cracking resistance in highly corrosive and tensile environments. The inventive alloy composition includes about 3.5 wt. % to about 5.5 wt. % Zn; about 1.0 wt. % to about 3.0 wt. % Mg; about 0.5 wt. % to about 1.2 wt. % Cu; less than about 1.0 wt. % Si; less than about 0.30 wt. % Mn; less than about 0.30 wt. % Fe; and a balance of Al and incidental impurities.

Description

RELATED APPLICATION[0001]This application claims the benefit of and priority to U.S. Provisional Application Ser. No. 60 / 826,131, filed Sep. 19, 2006, the contents of which are incorporated by reference herein in its entirety.FIELD OF THE INVENTION[0002]This invention relates generally to aluminum alloys for aerospace and automotive shaped castings having high tensile strength and high resistance to stress corrosion cracking (SCC).BACKGROUND OF THE INVENTION[0003]Cast aluminum parts are used in structural applications in automobile suspensions to reduce weight. The most commonly used group of alloys, Al7SiMg, has well established strength limits. In order to obtain lighter weight parts, higher strength material is needed with established material properties for design. At present, cast materials made of A356.0, the most commonly used Al7SiMg alloy, can reliably guarantee ultimate tensile strength of 290 MPa (42 ksi), and tensile yield strength of 220 MPa (32 ksi) with elongations of...

Claims

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Application Information

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IPC IPC(8): C22F1/053C22C21/10
CPCC22C21/10C22C1/06C22F1/053
Inventor LIN, JEN C.YAN, XINYANZHANG, WENPINGMORAN, JAMES P.NEWMAN, JOHN M.SAWTELL, RALPH R.SCOTT, GERALD D.BRANDT, MICHAELFORS, BOB R.BORNS, RICK A.MBAYE, MOUSTAPHA
Owner AUTOMOTIVE CASTING TECH
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