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Improved 7XXX aluminum alloys, and methods for producing the same

A technology of aluminum alloy and aluminum alloy sheet, which is applied in transportation and packaging, superstructure, vehicle parts, etc., and can solve problems such as improving aluminum alloy and increasing alloy strength

Inactive Publication Date: 2015-01-28
ALUMINUM CO OF AMERICA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, improving one property of aluminum alloys without degrading the other is difficult to achieve
For example, it is difficult to increase the strength of an alloy without reducing its toughness

Method used

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  • Improved 7XXX aluminum alloys, and methods for producing the same
  • Improved 7XXX aluminum alloys, and methods for producing the same
  • Improved 7XXX aluminum alloys, and methods for producing the same

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0494] A first 7xxx aluminum alloy having the composition listed in Table 3 below was cast, homogenized and hot rolled into plates / sheets having intermediate gauges of approximately 0.53 inches, 0.32 inches, 0.16 inches (x2) and 0.106 inches, respectively . One of the 0.16 inch samples (the control) was then cold rolled to about 0.08 inch final sheet gauge, solution heat treated by soaking at about 885°F for about 30 minutes, followed by cold water quenching and subsequent stretching for 1- 2% for stress relief. The control was naturally aged for approximately four days, followed by heat treatment to a T6 type condition.

[0495] The others of the samples were first solution heat treated (in the same process) and then cold rolled to 0.08 inch final sheet gauge, representing about 85%, 75%, 50% and 25% cold work, respectively.

[0496] Table 3 - Composition of the first 7xxx aluminum alloys (all values ​​are expressed in weight percent)

[0497] Si

Fe

Cu ...

example 2

[0519] Additional mechanical properties of the first 7xxx aluminum alloys were tested. Specifically, the first 7xxx aluminum alloys were tested for longitudinal (L) and long transverse (LT) strength, elongation, and fracture toughness properties, the results of which are provided in Tables 11-12 below. These results indicate that 7xxx aluminum alloy bodies can achieve similar strength and elongation properties in the L and LT directions.

[0520] Table 11 - Strength and elongation properties of the first 7xxx aluminum alloys

[0521]

[0522]

[0523] Table 12 - Toughness properties of the first 7xxx aluminum alloys

[0524]

[0525] Fracture toughness test according to ASTM test standard ASTM E561 and ASTM B646 (for K app and K R25 ) and E399 and B645 (K IC / K Q )conduct. Use the middle crack fracture sample (M(T)) for K app Measurement. The sample width (W) is 6.3 inches, the thickness (B) is 0.08 inches, and the initial crack length (2a 0 ) is 1.573 in...

example 3

[0538] Two additional 7xxx aluminum alloy bodies were prepared according to Example 1 . Both are known Russian alloys. One alloy is a copper-free 7xxx aluminum alloy (alloy 1980) and the other alloy is a low-copper 7xxx aluminum alloy (alloy 1953). The compositions of these aluminum alloys are provided in Tables 16-17 below. The alloy contains the listed ingredients, with the balance being aluminum and not greater than 0.05% by weight of each other element, and the sum of these other elements is not greater than 0.15% by weight.

[0539] Table 16 - Composition of the second 7xxx alloys (all values ​​are expressed in weight percent)

[0540] 1953

[0541] Table 17 - Composition of third 7xxx alloys (all values ​​are expressed in weight percent)

[0542] 1980

[0543] The results of Example 3 illustrate that the cold working step and heat treatment step must be properly accomplished to achieve improved properties such as strength. As shown in Figures ...

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Abstract

New 7xxx aluminum alloy bodies and methods of producing the same are disclosed. The new 7xxx aluminum alloy bodies may be produced by preparing the aluminum alloy body for post-solutionizing cold work, cold working by at least 25%, and then thermally treating. The new 7xxx aluminum alloy bodies may realize improved strength and other properties.

Description

[0001] Cross references to related patent applications [0002] This patent application claims U.S. Provisional Patent Application No. 61 / 608,034, filed March 7, 2012, entitled "IMPROVED 7XXX ALUMINUM ALLOYS, AND METHODS FOR PRODUCTING THE SAME" Priority, this patent application is incorporated herein by reference in its entirety. [0003] This patent application is related to (a) U.S. Provisional Patent Application No. 61 / 608,050 filed March 7, 2012 and (b) U.S. Provisional Patent Application No. 61 / 608,075 filed March 7, 2012 and (c) 2012 U.S. Provisional Patent Application No. 61 / 608,092, filed March 7, 2012 and (d) U.S. Provisional Patent Application No. 61 / 608,098, filed March 7, 2012. Background technique [0004] Aluminum alloys can be used in a variety of applications. However, improving one property of an aluminum alloy without deteriorating another property is difficult to achieve. For example, it is difficult to increase the strength of an alloy without reducing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22C21/10B22D21/04
CPCC22F1/002B62D29/008C22C21/10B22D11/1213C22F1/053B22D11/0622C22C21/00B22D11/003
Inventor 雷杰夫·卡迈特约翰·M·纽曼拉尔夫·R·索泰尔林正淳达尔·G·博伊赛尔加里·H·布雷詹姆斯·丹尼尔·布赖恩特布雷特·P·康纳马里奥·格雷科吉诺·诺曼·亚塞拉戴维·J·麦克尼什肖恩·J·默撒罗伯托·J·洛加肖恩·P·沙利文
Owner ALUMINUM CO OF AMERICA
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