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High strength aluminum casting alloy

a casting alloy, high-tensile technology, applied in the field of aluminum casting alloys, can solve the problems of difficult casting of high-tensile 7xxx series alloys, and achieve the effects of improving mechanical properties, high strength, and improving mechanical properties

Inactive Publication Date: 2012-04-12
RAO UES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is about a high strength cast alloy made of aluminum, zinc, magnesium, copper, manganese, iron, and silicon. The alloy has a tensile strength of at least 500 MPa and 4% elongation at room temperature. The process for making the alloy involves melting the aluminum and adding the alloying additions. The alloy can be poured into a desired shape and solidified under pressure or at room temperature. The cast component can also be heat treated to improve its mechanical properties. The technical effect of this invention is to provide a high strength cast alloy with improved mechanical properties.

Problems solved by technology

However, high strength 7XXX series alloys are known to be difficult to cast, with most common defects resulting from the casting thereof being intergranular porosity, hot tears, and cold cracks.

Method used

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  • High strength aluminum casting alloy
  • High strength aluminum casting alloy
  • High strength aluminum casting alloy

Examples

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example 1

Direct Chill Casting

[0023]A cast aluminum (Al) alloy having the chemical composition shown in Table 1 was melted and cast at Universal Alloy Corporation, located in Anaheim, Calif. by direct chill (DC) casting in the form of 178 millimeter (mm) diameter billets.

TABLE 1Cast Alloy Composition.AlZnMgCuMnSiFeZrScTiOtherBal.7.122.011.620.330.010.030.170.28

After casting, the billets were homogenized by holding at 475° C. for 23 hours, then were slow cooled from 475 C to 250° C. within 14 hours and then cooled to room temperature in air. The homogenized billets were ultrasonically tested using an AMS standard AMS-STD-2154 N / C, Type I, Class A, and no cracks or porosity were detected. Tensile samples were extracted from the homogenized billets in three orthogonal directions. The longitudinal direction was parallel to the main axis of the billet. The radial direction was directed along the billet radius, and the transverse direction was perpendicular to the longitudinal and radial directions...

example 2

Sand Casting Under Hydrostatic Pressure

[0026]In this example, charges of the DC cast billets described in Example 1, of approximately 11.5 kilograms (kg) each, were re-melted in an electrically heated crucible furnace at 760° C., degassed using argon gas for 3 minutes, and poured into two wedge sand molds. One mold was kept in air under the normal atmospheric pressure, while another mold was immediately placed inside a pressure vessel. The pressure vessel was 1.2 meter (m) in diameter and 1.8 m in height, and pressure was applied via a near-equal mixture of dry compressed air and compressed nitrogen gas. The peak pressure of 10 atm was achieved within the pressure vessel approximately 90 seconds after pouring of a wedge. In this manner, one cast wedge of the Al alloy was solidified at 1 atm and another wedge was solidified at 10 atm of pressure.

[0027]A schematic of the wedge casting and gating system is shown in FIG. 1. The wedge thickness increased from 6.4 mm at the bottom of the ...

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Abstract

The present invention discloses a high strength Al—Zn—Mg—Cu (7000 series) alloy that can be cast, the cast alloy having a tensile strength of at least 500 megapascals (MPa) and 4% elongation. The cast alloy composition can include about 5.5-9.0 weight percent (wt. %) of zinc, 2.0-3.5 wt. % of magnesium, 0.1-0.5 wt. % scandium, 0.05-0.20 wt. % zirconium, 0.5-3.0 wt. % copper, 0.10-0.45 wt. % manganese, 0.01-0.35 wt. % iron, 0.01-0.20 wt. % silicon with a balance of aluminum and possible casting impurities. The alloy also has good fluidity comparable to high silicon cast aluminum alloys and components can be manufactured using direct chill casting, sand casting, and / or sand casting under high pressure.

Description

RELATED APPLICATION[0001]This application claims priority to U.S. Provisional Patent Application No. 61 / 392,310 filed on Oct. 12, 2010, having the same title and which is incorporated herein in its entirety by reference.FIELD OF THE INVENTION[0002]The present invention is related to an aluminum alloy, and in particular, to an aluminum casting alloy that exhibits high strength and adequate ductility.BACKGROUND OF THE INVENTION[0003]The use of aluminum alloys for lightweight components when compared to steel is known. For example, aluminum alloys are used extensively in the automotive and aircraft industry. In addition, with a face centered cubic structure, aluminum alloys have also found use in cryogenic type environments. For example, U.S. Pat. No. 7,060,139 filed on Nov. 8, 2002, titled “High Strength Aluminum Alloy Composition”, provides a high strength 7XXX series alloy that can be used at cryogenic temperatures and afford a tensile strength of at least 790 megapascals (MPa) with...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C22C21/10C22F1/053
CPCC22C21/10C22F1/057C22F1/053C22C21/12
Inventor SENKOV, OLEG N.SENKOVA, SVETLANA V.
Owner RAO UES
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