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

a technology of aluminum-magnesium-lithium alloys and alloys, which is applied in the field of new aluminum-magnesium-lithium alloys, can solve the problems of reducing ductility and too much lithium, and achieve the effects of reducing density, improving strength, and reducing ductility

Inactive Publication Date: 2015-12-31
ARCONIC INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The new aluminum-magnesium-lithium alloys described in this patent have improved strength and corrosion resistance. The new alloys should contain at least 2.25 wt. % Mg, and no more than 3.7 wt. % Mg. The new alloys can achieve a better combination of strength, corrosion resistance, and ductility.

Problems solved by technology

Magnesium may help improve strength, but too much magnesium may degrade corrosion resistance.
Lithium helps reduce density and may help improve strength, but too much lithium may reduce ductility.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0035]Twelve book mold ingots were produced, the compositions of which are provided in Table 1, below (all values in weight percent).

TABLE 1Example 1 Alloy CompositionsAlloyMgLiCuZn12.890.000022.800.210032.900.870042.801.200052.701.600065.030.000074.750.230084.750.870094.551.2000105.550.8500115.040.000.190.54124.500.860.180.46

[0036]Unless otherwise indicated, all alloys contained the listed elements, from about 0.10 to 0.13 wt. % Zr, about 0.60 wt. % Mn, not more than about 0.04 wt. % Fe, not more than 0.03 wt. % Si, about 0.02 wt. % Ti, the balance being aluminum and other elements, where the other elements did not exceed more than 0.05 wt. % each, and not more than 0.15 wt. % total of the other elements.

[0037]The alloys were cast as approximately 2.875 inch (ST)×4.75 inch (LT)×17 inch (L) ingots that were scalped (machined) to about 2 inches thick. Alloys 10-12 were then homogenized. Each ingot was then hot rolled to a gauge of about 0.25 inch. The finish hot rolling temperature v...

example 2

[0041]Fourteen book mold ingots were produced, the compositions of which are provided in Table 8, below (all values in weight percent).

TABLE 8Example 2 Alloy CompositionsAlloyMgLiZnCuAg134.422.010.960.350.24144.332.091.870.350.23154.532.130.970.950.24164.482.181.920.950.24174.412.030.970.350.65184.382.041.900.360.65194.412.060.980.950.66204.362.121.890.890.62214.372.081.440.650.44224.312.222.820.640.43234.432.161.441.850.45244.452.181.480.680.91254.452.061.450.670.45264.402.131.450.670.44

[0042]Unless otherwise indicated, all alloys contained the listed elements, from about 0.10 to 0.012 wt. % Zr, not more than about 0.03 wt. % Fe, not more than 0.04 wt. % Si, about 0.02 wt. % Mn, about 0.02 wt. % Ti, the balance being aluminum and other elements, where the other elements did not exceed more than 0.05 wt. % each, and not more than 0.15 wt. % total of the other elements. Alloy 25 contained about 0.24 wt. % Si. Alloy 26 contained about 0.87 wt. % Si.

[0043]The alloys were cast as approx...

example 3

[0047]Twenty-three book mold ingots were produced, the compositions of which are provided in Table 9, below (all values in weight percent).

TABLE 10Example 1 Alloy CompositionsAlloyMgLiMnCuZn272.21.10.550.05—282.51.00.58——293.31.00.54——303.51.10.56——314.11.10.57——322.91.10.54——333.11.00.29——343.21.1—0.01—353.01.01.10——363.01.01.60——373.01.00.56—0.10383.01.10.56—0.24392.91.10.57—0.51403.01.10.56—0.97413.01.10.56—1.90422.91.00.570.140.02433.11.10.560.29—442.91.10.560.48—453.11.00.560.250.50462.81.10.56——472.94—0.54——482.90.500.57——492.81.000.57——502.91.600.57——

Unless otherwise indicated, all alloys contained the listed elements, from about 0.10 to 0.14 wt. % Zr, not more than about 0.04 wt. % Fe, not more than 0.08 wt. % Si, the balance being aluminum and other elements, where the other elements did not exceed more than 0.05 wt. % each, and not more than 0.15 wt. % total of the other elements. Alloy 46 contained about 0.09 wt. % Zr, about 0.10 wt. % Fe and about 0.14 wt. % Si.

[0048]The...

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Abstract

New aluminum-magnesium-lithium alloys, and methods for producing the same are disclosed. The alloys generally contain 2.0-3.9 wt. % Mg, 0.1-1.8 wt. % Li, up to 1.5 wt. % Cu, up to 2.0 wt. % Zn, up to 1.0 wt. % Ag, up to 1.5 wt. % Mn, up to 0.5 wt. % Si, up to 0.35 wt. % Fe, 0.05 to 0.50 wt. % of a grain structure control element, up to 0.10 wt. % Ti, and up to 0.10 wt. % of any other element, with the total of these other elements not exceeding 0.35 wt. %, the balance being aluminum.

Description

BACKGROUND[0001]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 of an alloy without decreasing the toughness of an alloy. Other properties of interest for aluminum alloys include corrosion resistance and fatigue resistance, to name two.SUMMARY OF THE DISCLOSURE[0002]Broadly, the present patent application relates to new aluminum-magnesium-lithium alloys, and methods for producing the same. The alloys generally contain 2.0-3.9 wt. % Mg, 0.1-1.8 wt. % Li, up to 1.5 wt. % Cu, up to 2.0 wt. % Zn, up to 1.0 wt. % Ag, up to 1.5 wt. % Mn, up to 0.5 wt. % Si, up to 0.35 wt. % Fe, 0.05 to 0.50 wt. % of a grain structure control element (defined below), up to 0.10 wt. % Ti, and up to 0.10 wt. % of any other element, with the total of these other elements not exceeding 0.35 wt. %, the balance being aluminum.[0003]The new aluminum-mag...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C22C21/06
CPCC22C21/06C22F1/053C22F1/047C22F1/04
Inventor BOVARD, FRANCINERIOJA, ROBERTO J.SAWTELL, RALPH R.MOOY, DIRK C.
Owner ARCONIC INC
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