Low-density high-strength damage-resistant aluminum-lithium alloy hot-rolled plate and preparation method thereof

An aluminum-lithium alloy, low-density technology, applied in the field of low-density, high-strength, damage-resistant aluminum-lithium alloy hot-rolled sheets and its preparation, can solve the problems of low yield strength, low density, high density, etc., and achieve safe process operation and low cost , The effect of simple preparation method

Pending Publication Date: 2021-08-06
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although 1420 Al-Li alloy has low density and good welding performance, its yield strength is lower than 430MPa
Although the yield strength of 2195 aluminum-lithium alloy can reach more than 550MPa, its density is greater than 2.7g / cm 3 , the plane fracture toughness is lower than 30MPa·m 1 / 2 , the number of fatigue fractures under 240MPa is less than 1×10 6 Second-rate

Method used

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  • Low-density high-strength damage-resistant aluminum-lithium alloy hot-rolled plate and preparation method thereof
  • Low-density high-strength damage-resistant aluminum-lithium alloy hot-rolled plate and preparation method thereof
  • Low-density high-strength damage-resistant aluminum-lithium alloy hot-rolled plate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A low-density, high-strength, damage-resistant aluminum-lithium alloy hot-rolled plate, in terms of mass percentage, the final chemical composition of the alloy consists of the following components: Cu3.6%, Li1.1%, Mg0.5%, Ag0.3% , Zn0.26%, Zr0.1%, Mn0.3%, Fe0.05%, Si0.05%, the balance is Al, wherein Fe and Si elements are brought by raw materials and operating tools when preparing alloys, as Unavoidable impurity elements.

[0037] The preparation method of the above-mentioned lithium alloy hot-rolled plate comprises the following steps:

[0038] 1) Smelting: According to the designed aluminum-lithium alloy composition distribution ratio, the raw materials are added in the form of pure aluminum, pure lithium, pure magnesium, pure silver, pure zinc, Al-10Mn, Al-4Zr alloy, Al-50Cu alloy, in the vacuum Smelting in a smelting furnace, followed by casting to obtain ingots.

[0039] 2) Three-stage annealing: first raise the temperature of the cast ingot to 300°C, hold for 8...

Embodiment 2

[0045] A low-density, high-strength, damage-resistant aluminum-lithium alloy hot-rolled plate, the final chemical composition of the alloy consists of the following components in terms of mass percentage: Cu3.9%, Li1.1%, Mg0.76%, Ag0.3% , Zn0.34%, Zr0.1%, Mn0.27%, Fe0.04%, Si0.05%, the balance is Al, wherein Fe and Si elements are brought by raw materials and operating tools when preparing alloys, as Unavoidable impurity elements.

[0046] The preparation method of the above-mentioned lithium alloy hot-rolled plate comprises the following steps:

[0047] 1) Smelting: According to the designed aluminum-lithium alloy composition distribution ratio, the raw materials are added in the form of pure aluminum, pure lithium, pure magnesium, pure silver, pure zinc, Al-10Mn, Al-4Zr alloy, Al-50Cu alloy, in the vacuum Smelting in a smelting furnace, followed by casting to obtain ingots.

[0048] 2) Three-stage annealing: first raise the temperature of the cast ingot to 350°C, hold for ...

Embodiment 3

[0054] A low-density, high-strength, damage-resistant aluminum-lithium alloy hot-rolled plate, the final chemical composition of the alloy consists of the following components in terms of mass percentage: Cu3.8%, Li1.0%, Mg0.9%, Ag0.25% , Zn0.25%, Zr0.15%, Mn0.2%, Fe0.05%, Si0.04%, the balance is Al, wherein Fe and Si elements are brought by raw materials and operating tools when preparing alloys, as Unavoidable impurity elements.

[0055] The preparation method of the above-mentioned lithium alloy hot-rolled plate comprises the following steps:

[0056] 1) Smelting: According to the designed aluminum-lithium alloy composition distribution ratio, the raw materials are added in the form of pure aluminum, pure lithium, pure magnesium, pure silver, pure zinc, Al-10Mn, Al-4Zr alloy, Al-50Cu alloy, in the vacuum Smelting in a smelting furnace, followed by casting to obtain ingots.

[0057] 2) Three-stage annealing: first raise the temperature of the ingot to 380°C, hold for 3 hou...

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Abstract

The invention discloses a low-density high-strength damage-resistant aluminum-lithium alloy hot-rolled plate and a preparation method thereof. The aluminum-lithium alloy hot-rolled plate comprises the following components in percentage, by mass, 3.5-4.0% of Cu, 0.7-1.1% of Li, 0.5-1.0% of Mg, 0.2-0.5% of Ag, 0.25-0.5% of Zn, 0.1-0.2% of Zr, 0.1-0.3% of Mn, 0-0.1% of Ti, 0-0.08% of Sc, less than or equal to 0.05% of Fe, less than or equal to 0.05% of Si and the balance of Al, the total amount of Cu and Li is 4.0-5.5, and the mass ratio of Cu to Li is 3.0-5.0. The low-density aluminum alloy with excellent mechanical properties is obtained by regulating and controlling the mass fraction proportion of the main alloy elements and the process conditions of deformation heat treatment and the like, and the prepared aluminum alloy has excellent comprehensive mechanical properties such as room temperature strength, plane fracture toughness and fatigue fracture resistance.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy material preparation and processing, and in particular relates to a low-density, high-strength, damage-resistant aluminum-lithium alloy hot-rolled plate and a preparation method thereof. Background technique [0002] Advanced light metal materials with high specific strength, high specific stiffness, and high damage tolerance are one of the main measures to reduce the structural weight and reduce the structural weight factor. Experience shows that reducing the material density by 10% can generally reduce the weight of the structure by 10%; while increasing the mechanical properties of the material (such as: strength) by 10% can only reduce the weight of the structure by about 1% to 3%. Therefore, the development of low-density, high-strength, damage-resistant and lightweight structural materials is the most effective way to reduce the structural weight of transportation vehicles. Using dur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/16C22C21/18C22C21/14C22C1/03C22F1/057C21D1/26C21D8/02C21D1/18
CPCC22C21/16C22C21/18C22C21/14C22C1/026C22C1/03C22F1/057C21D1/26C21D8/0226C21D8/0247C22F1/002
Inventor 刘文胜肖代红黄兰萍
Owner CENT SOUTH UNIV
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