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A kind of aluminum lithium alloy and rolling method

An aluminum-lithium alloy, rolling deformation technology, applied in the field of metal material engineering, can solve the problems of original grain boundary residue, unsuitable for manufacturing large-thickness parts of more than 40mm, low high-direction elongation, etc., to improve high-direction elongation. rate effect

Active Publication Date: 2019-08-16
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 alloying elements will produce a large number of grain boundary precipitated phases. These phases have a "pinning" effect in the plastic forming process, resulting in a large number of original grain boundary residues, resulting in low elongation in the high direction, which is not suitable for manufacturing large thickness specifications above 40mm parts

Method used

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  • A kind of aluminum lithium alloy and rolling method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Alloy composition: 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 ≤0.15%, the balance is Al.

[0024] Homogenization treatment: heat the blank to 420°C, hold for 2 hours; continue to heat up to 480°C, hold for 38 hours; cool to 200°C with the furnace, and air cool to room temperature;

[0025] Ingot rolling and billet opening: the rolling temperature is 380°C, and the rolling deformation is 35%;

[0026] Low temperature rolling: rolling start temperature 330℃, rolling deformation 20%;

[0027] High-temperature rolling: the rolling start temperature is 380°C, and the rolling deformation is not less than 45%.

Embodiment 2

[0029] Alloy composition: 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 is Al.

[0030] Homogenization treatment: heat the blank to 420°C for 4 hours; continue to heat up to 490°C and hold for 38 hours; cool to 200°C with the furnace, then air cool to room temperature;

[0031] Ingot rolling and billet opening: the rolling temperature is 400°C, and the rolling deformation is 38%;

[0032] Low temperature rolling: rolling start temperature 300℃, rolling deformation 19%;

[0033] High-temperature rolling: the rolling start temperature is 400°C, and the rolling deformation is not less than 52%.

Embodiment 3

[0035] Alloy composition: 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 is Al.

[0036] Homogenization treatment: heat the blank to 430°C, hold for 6 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 rolling and billet opening: the rolling temperature is 420°C, and the rolling deformation is 45%;

[0038] Low temperature rolling: rolling start temperature 270℃, rolling deformation 25%;

[0039] High-temperature rolling: the rolling start temperature is 420°C, and the rolling deformation is not less than 50%.

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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 a rolling method thereof. The Al and Li alloy material is preparedfrom 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 balanceof Al, wherein the total amount of other impurities is less than or equal to 0.15%. The rolling method comprises the following steps of equalizing; rolling. The Al and Li alloy material and the rolling 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 a rolling method thereof. Background technique [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 curren...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/16C22C21/18C22C21/14C22F1/057
CPCC22C21/14C22C21/16C22C21/18C22F1/057
Inventor 王胜强冯朝辉何维维
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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