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Aluminum-lithium alloys, and methods for producing the same

a technology of aluminum alloys and alloy strips, which is applied in the direction of manufacturing tools, metal-working apparatus, shaping tools, etc., can solve the problems of difficult to increase the strength of aluminum alloys without decreasing the toughness of aluminum alloys, and achieve the effect of avoiding non-uniformity problems, reducing the change of aluminum alloys during casting, and improving the properties of strips

Inactive Publication Date: 2014-12-18
ARCONIC INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text describes a method for making aluminum alloy bodies by continuous casting between two rolls. The continuous casting process results in a solutionizing of the alloy, which results in improved strength and ductility properties. The alloy can also be processed to have a tailored strength-to-ductility ratio for different applications, such as armor. The method includes using a ceramic feed tip to prevent exposure of the molten metal to the atmosphere and minimize leakage. The multi-layer product resulting from the process has improved properties with higher strength towards the inside of the product.

Problems solved by technology

However, improving one property of an aluminum alloy without degrading another property is elusive.
For example, it is difficult to increase the strength of an alloy without decreasing the toughness of an alloy.

Method used

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  • Aluminum-lithium alloys, and methods for producing the same
  • Aluminum-lithium alloys, and methods for producing the same
  • Aluminum-lithium alloys, and methods for producing the same

Examples

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Effect test

example 1

Testing of 2xxx Al—Li Alloy with New Process

[0453]A 2xxx Al—Li alloy having the composition listed in Table 5 is cast, homogenized, and hot rolled into plate / sheet having intermediate gauges of about 0.53 inch, 0.32 inch, 0.16 inch (×2), and 0.106 inch, respectively. One of the 0.16 inch samples (the control) is then cold rolled to a final gauge of about 0.08 inch, solution heat treated by soaking at about 940° F. for about 120 minutes, followed by a cold water quench. The control sample is then stretched 1-2%.

TABLE 5Composition of 2xxx Al—Li alloy (all values in weight percent)OtherOthersSiFeCuMgZnZrLiAgMnEachTotalBal.0.020.023.720.810.350.080.760.360.31≦0.05≦0.15Al

The other samples are first solution heat treated (by the same process) and then cold rolled to a final gauge of 0.08 inch, representing about 85%, 75%, 50%, and 25% cold work, respectively. All samples are naturally aged for about four days, and then thermally treated at three temperatures (250° F., 290° F., and 330° F....

example 2

Surface Roughness of 2xxx+Li Alloy

[0465]The surface roughness of a 2199 was tested. Specifically, a 2199 ingot was hot rolled to intermediate gauge, and then split into a first set and a second set. The first set was processed in accordance with conventional practices, i.e., cold rolled to final gauge and then solutionized. Some of the first set are then stretched a small amount for flatness (about 2%), and then thermally treated (“the 1S-A pieces”). Others of the first set are stretched a small amount for flatness (about 2%) and then naturally aged to a substantially stable condition (“the 1S-B pieces”). The second set of materials were processed according to the new processes disclosed herein, i.e., solutionized, then cold rolled to final gauge, either about 50% or about 75% (the “2S-50” and “2S-75” pieces, respectively). Some of the 2S-50 pieces are naturally aged (the “2S-50-NA pieces”) and some of the 2S-50 pieces are thermally treated (the “25-50-TT pieces”). Likewise, some of...

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Abstract

New Al—Li alloy bodies and methods of producing the same are disclosed. The new Al—Li 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 Al—Li alloy bodies may realize improved strength and other properties.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This patent application is a continuation of International Patent Application No. PCT / US2013 / 027858, filed Feb. 27, 2013, which claims priority to U.S. Provisional Patent Application No. 61 / 608,075, filed Mar. 7, 2012, entitled, “IMPROVED ALUMINUM-LITHIUM ALLOYS, AND METHODS FOR PRODUCING THE SAME”, which are both incorporated herein by reference in their entirety.[0002]This patent application is related to (a) U.S. Provisional Patent Application No. 61 / 608,050, filed Mar. 7, 2012, and (b) U.S. Provisional Patent Application No. 61 / 608,034, filed Mar. 7, 2012, and (c) U.S. Provisional Patent Application No. 61 / 608,092, filed Mar. 7, 2012, and (d) U.S. Provisional Patent Application No. 61 / 608,098, filed Mar. 7, 2012.BACKGROUND[0003]Aluminum alloys are useful in a variety of applications. However, improving one property of an aluminum alloy without degrading another property is elusive. For example, it is difficult to increase the strength...

Claims

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Application Information

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IPC IPC(8): C22F1/057C22C21/16C22C21/18C22C21/14
CPCC22F1/057C22C21/14B22D11/003C22C21/18C22C21/16B22D21/04C22C21/00C22F1/04
Inventor KAMAT, RAJEEV G.NEWMAN, JOHN M.SAWTELL, RALPH R.LIN, JEN C.
Owner ARCONIC INC
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