Rapid aging of high strength 7xxx aluminum alloys and methods of making the same

An aluminum alloy, pre-aging technology, applied in the direction of chemical instruments and methods, metal layered products, layered products, etc., can solve problems such as expensive processing steps and low-efficiency manufacturing processes

Pending Publication Date: 2019-08-30
NOVELIS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Achieving such alloys often requires costly processing steps
For example, artificial aging procedures may require soaking at high temperatures for up to 24 hours, creating an extremely inefficient manufacturing process

Method used

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  • Rapid aging of high strength 7xxx aluminum alloys and methods of making the same
  • Rapid aging of high strength 7xxx aluminum alloys and methods of making the same
  • Rapid aging of high strength 7xxx aluminum alloys and methods of making the same

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0064] Example 1: Exemplary Method of Making 7xxx Series Aluminum Alloy Articles

[0065]An exemplary method 100 for processing an alloy as described herein is at figure 1 shown in . Fabricated 7xxx series aluminum alloy sheet, plate or sheet material (referred to as the F temper) is solutionized (at 110) at a temperature of at least 460°C for a period of at least 60 seconds. After solutionization, the aluminum alloy was quenched (at 120) with water at a temperature of about 55°C to room temperature. After the quenching step 120, the aluminum alloy is deformed (at 130) to produce an aluminum alloy article.

[0066] In another method as described herein, an aluminum alloy article is deformed and quenched (at 140) in one step. The aluminum alloy article is placed in a cooling mold at a temperature between about 380°C and about 480°C, deformed and mold quenched to form the aluminum alloy article.

[0067] In yet another method as described herein, after solutionizing, the al...

example 2

[0069] Example 2: Effect of rapid pre-aging temperature on mechanical properties

[0070] Six 7xxx series alloys were prepared for strength testing (see Table 1). Alloys 1-6 were prepared by the same method. The alloy is solutionized, quenched and deformed. Samples from each alloy were (1) conventionally aged by heating at 125°C for 24 hours (bringing the material to a "T6" temper); (2) conventionally aged by heating at 125°C for 24 hours with paint bake (to bring the material to a "T6" temper); (3) perform the rapid pre-aging method described herein by heating at 125°C for 10-15 minutes, followed by a paint bake (to bring the material to a T8x temper); (4 ) the rapid pre-aging method described herein by heating at 180°C for 30 minutes (to bring the material to a T8x temper); or (5) the rapid pre-aging method described herein by heating at 180°C for 45 minutes (to bring the material to a T8x temper); Material reaches T8x temper).

[0071] Table 1

[0072]

[0073]

...

example 3

[0079] Example 3: Effect of Annealing on Mechanical Properties

[0080] Alloys 3, 5 and 6 (see Table 1) were prepared by hot rolling, optional annealing, cold rolling, solutionizing, quenching, deformation, exemplary rapid aging and paint bake at 180°C for 30 minutes. image 3 The effect of annealing on the yield strength of the alloy is shown. An optional annealing step (ie, intermediate annealing between hot and cold rolling) was performed on samples designated "IA" and no optional annealing step was performed on samples designated "No IA". Annealing is performed by heating the coiled alloy product to a temperature of about 410°C at a heating rate of about 50°C / hour. The coiled alloy product was then soaked at about 410°C for about 1 hour, cooled to about 350°C and soaked at about 350°C for about 2 hours. The coil is then allowed to cool to room temperature.

[0081] like image 3 As shown, the samples processed without the optional annealing step exhibit higher yield st...

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Abstract

Disclosed herein are methods of processing 7xxx aluminum alloys using a rapid pre-aging step, along with alloys prepared according to the methods. The aluminum alloy products described herein have high strength when subjected to a rapid pre-aging step, as described above, and subsequent thermal treatment, such as paint baking or coating. The alloys prepared and processed according to the methods described herein can be used, for example, in automotive, transportation, electronics, and industrial applications.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS [0002] This application claims the benefit of U.S. Provisional Application No. 62 / 447,132, filed January 17, 2017, which is hereby incorporated by reference in its entirety. technical field [0003] This article describes high strength 7xxx series aluminum alloys and methods for their preparation and processing. Background technique [0004] Aluminum alloys with high strength are desirable in many applications to enhance product performance, including automotive applications, transportation (including, but not limited to, trucks, trailers, trains, aerospace and marine) applications, and electronic applications. Such alloys should have high strength, among other properties. Achieving such alloys often requires costly processing steps. For example, artificial aging procedures may require soaking at high temperatures for up to 24 hours, creating an extremely inefficient manufacturing process. The ability to eliminate this ine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/10C22F1/053
CPCC22C21/10C22F1/053B32B15/01C22F1/002
Inventor C.吴R.V.库尔卡尼R.G.卡马特R.R.莫罕蒂R.塔拉
Owner NOVELIS INC
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