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Al-Cu-Li-Mg-Mn-Zn ALLOY WROUGHT PRODUCT

a technology of wrought alloys and cu-li, which is applied in the field of cu-li wrought alloy products, can solve the problems of insufficient combined strength and fracture toughness of such alloys, and the difficult casting of conventional alloys containing relatively high amounts of lithium

Inactive Publication Date: 2021-07-08
NOVELIS KOBLENZ GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is about a new alloy that has excellent strength, corrosion resistance, and fracture toughness. The alloy also has good thermal stability after being exposed to high temperatures for a long time. The alloy has a low amount of silver, which makes it more durable and reliable. The alloy can be used to make plate products, which have good properties and are less sensitive to changes in thickness. Overall, the new alloy has many desirable qualities that make it suitable for commercial delivery.

Problems solved by technology

However, casting of such conventional alloys containing relatively high amounts of lithium is difficult.
Furthermore, the combined strength and fracture toughness of such alloys is not optimal.

Method used

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  • Al-Cu-Li-Mg-Mn-Zn ALLOY WROUGHT PRODUCT

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[0057]On a laboratory scale 2 alloys have been cast and machined into rolling blocks of 260×200×80 mm. The alloy compositions are given in Table 1. These were homogenised for 5 h@500° C. followed by 10 h@510° C. After pre-heating to 480° C. the rolling blocks were hot rolled from 80 mm to a gauge of 30 mm. Then solution heat-treated for 30 min@500° C. followed by a cold water quench and within 30 minutes thereafter stretched by 2%.

TABLE 1Alloy composition (in wt. %) of the alloys processed.Balance is made by aluminium and unavoidableimpurities and with 0.03% Fe and 0.02% Si.Alloying elementAlloyCuLiMgMnZnZrTiAgA3.91.10.40.40.40.110.020.35B3.91.10.40.40.40.110.020.0

[0058]In order to bring the alloy to a T84 temper the Ag-free alloy was aged for 16 h@150° C. and the Ag containing alloy for 10.5 h@150° C. The difference in ageing time to arrive at the T84 temper is due to the difference in silver-content which has an effect on the ageing response.

[0059]In order to test the thermal stab...

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Abstract

An aluminium alloy wrought product for structural members having a chemical composition of, in wt. %: Cu 3.2% to 4.4%, Li 0.8% to 1.4%, Mg 0.20% to 0.90%, Mn 0.10% to 0.8%, Zn 0.20% to 0.80%, one or more elements selected from the group of: (Zr 0.05% to 0.25%, Cr 0.05% to 0.30%, Ti 0.01% to 0.25%, Sc 0.05% to 0.4%, Hf 0.05% to 0.4%), Ag<0.08%, Fe<0.15%, Si<0.15%, unavoidable impurities and balance aluminium.

Description

FIELD OF THE INVENTION[0001]The invention relates to an Al—Cu—Li wrought alloy product, more in particular an Al—Cu—Li—Mg—Mn—Zn type alloy product for structural members. Products made from this aluminium alloy product are very suitable for aerospace applications, but not limited to that. The alloy can be processed to various product forms, e.g. sheet, thin plate, thick plate, extruded or forged products.BACKGROUND TO THE INVENTION[0002]It is generally known in the aerospace industry that one of the most effective ways to reduce the weight of an aircraft is to reduce the density of aluminium alloys used in the aircraft construction. This desire led to the addition of lithium, the lowest density metal element, to aluminium alloys. Aluminium Association alloys, such as AA2090 and AA2091 contain about 2.0% lithium, which translates into about a 7% weight savings over alloys containing no lithium. Aluminium alloys AA2094 and AA2095 contain about 1.2% lithium. Another aluminium alloy, AA...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C22F1/057C22C21/18C22C21/16
CPCC22F1/057C22C21/16C22C21/18C22C21/14
Inventor SCHNITTGER, SVEN
Owner NOVELIS KOBLENZ GMBH
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