Al (aluminum) and Li (lithium) alloy material and extrusion method thereof

An aluminum-lithium alloy, extrusion method technology, applied in metal processing equipment and other directions, can solve the problems of original grain boundary residue, unsuitable for manufacturing large-thickness materials above 40mm, low vehicle high-direction elongation, etc. The effect of elongation

Active Publication Date: 2018-03-09
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Critically saturated alloy elements will produce a large number of grain boundary precipitated phases, which have a "pinning" effect in the plastic forming process, resulting in a large...

Method used

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  • Al (aluminum) and Li (lithium) alloy material and extrusion method thereof
  • Al (aluminum) and Li (lithium) alloy material and extrusion method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The alloy composition contains: 4.0% Cu, 0.8% Mg, 1.2% Li, 0.4% Ag, 0.10% Zr, 0.4% Mn, 0.4% Zn, Si≤0.08%, Fe≤0.10%, other impurities individually ≤0.05%, total Amount ≤ 0.15%, the balance is Al.

[0024] Homogenization treatment: heat the blank to 420°C, holding time for 6h; continue to heat up to 480°C, holding time for 38 hours; cool to 200°C with the furnace, and air cool to room temperature;

[0025] Ingot forging billet opening, initial forging temperature 380°C, final forging temperature 350°C, forging ratio 3;

[0026] Low temperature forging: initial forging temperature 340℃, forging ratio 2.5;

[0027] Extrusion, extrusion blank temperature 400 ℃, extrusion ratio 6.

Embodiment 2

[0029] Alloy composition contains: 4.0% Cu, 0.4% Mg, 1.2% Li, 0.4% Ag, 0.10% Zr, 0.4% Mn, Si≤0.08%, Fe≤0.10%, other impurities individually ≤0.05%, total ≤0.15% , the balance being Al.

[0030] Homogenization treatment: heat the blank to 420°C, hold for 2 hours; continue to heat up to 490°C, hold for 38 hours; cool to 200°C with the furnace, and air cool to room temperature;

[0031] Ingot forging billet opening, the initial forging temperature is 400°C, the final forging temperature is 360°C, and the forging ratio is 3.5;

[0032] Low temperature forging: initial forging temperature 300℃, forging ratio 3.3;

[0033] Extrusion, extrusion blank temperature 380 ℃, extrusion ratio 6.

Embodiment 3

[0035] Alloy composition contains: 3.2% Cu, 1.2% Mg, 1.0% Li, 0.4% Ag, 0.10% Zr, 0.4% Mn, Si≤0.08%, Fe≤0.10%, other impurities individually ≤0.05%, total ≤0.15% , the balance being Al.

[0036] Homogenization treatment: heat the blank to 420°C, hold for 8 hours; continue to heat up to 500°C, hold for 38 hours; cool to 200°C with the furnace, and air cool to room temperature;

[0037] Ingot forging billet opening, the initial forging temperature is 420°C, the final forging temperature is 350°C, and the forging ratio is 4;

[0038] Low temperature forging: initial forging temperature 260℃, forging ratio 2.5;

[0039] Extrusion, extrusion blank temperature 390 ℃, extrusion ratio 6.

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Abstract

The invention belongs to the field of metal material engineering, and relates to an Al (aluminum) and Li (lithium) alloy material and an extrusion method thereof. The Al and Li alloy material is prepared from the following components in percentage by mass: 3% to 4.2% of Cu (copper), 0.2% to 1.4% of Mg (magnesium), 0.6% to 1.5% of Li, 0 to 1% of Ag (silver), 0.06% to 0.15% of Zr (zirconium), 0.2% to 0.6% of Mn (manganese), 0 to 0.8% of Zn (zinc), less than or equal to 0.08% of Si (silicon), less than or equal to 0.10% of Fe (ferrum), less than or equal to 0.05% of single impurity, and the balance of Al, wherein the total amount of other impurities is less than or equal to 0.15%. The extrusion method comprises the following steps of equalizing; extruding. The Al and Li alloy material and theextrusion method have the advantages that a large amount of original intercrystalline residues due to production of a large amount of intercrystalline precipitation phase by the critical saturated alloy element can be avoided; the high-direction elongation rate is improved, and the manufacturing requirement of large and thick specification parts being 40mm or more is met.

Description

technical field [0001] The invention belongs to the field of metal material engineering and relates to an aluminum-lithium alloy material and an extrusion method. technical background [0002] Due to the addition of lithium element, aluminum-lithium alloy has obtained low density and high modulus characteristics, and has broad application prospects in aerospace, nuclear industry, transportation, sporting goods, weapons and other fields. In recent years, with the improvement of aluminum metallurgical equipment technology and basic metallurgical technology, the development trend of aluminum alloy is high purity, high performance and high alloying. There have been 600MPa grades manufactured by melting and casting technology and powder metallurgy technology. 800MPa grade aluminum alloy. The 500MPa aluminum-lithium alloy has been maturely applied in advanced fighter jets, large airliners and aerospace delivery equipment. The amount of alloying elements added to the current alum...

Claims

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Application Information

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IPC IPC(8): C22C21/18C22C21/16C22F1/057B21J5/00
CPCB21J5/002C22C21/16C22C21/18C22F1/057
Inventor 何维维冯朝辉王胜强
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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