Aluminum alloy structure material and preparation thereof

A technology of structural materials and aluminum alloys, which is applied in the manufacture of ground vehicles and space vehicle structural products, low-density and high-strength aluminum alloy structural materials and their preparation, can solve the problems of inability to meet the design requirements for weight reduction, difficulty in the strength of structural materials, and Low strength and other problems, to achieve the effect of improving high-cost and complicated technical routes, scientific and reasonable formula design, and shortening the manufacturing process

Active Publication Date: 2015-05-27
NO 52 INST OF CHINA NORTH IND GRP CORP
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

In order to increase the strength, hot rolling + annealing treatment + large deformation cold hardening + stabilizing heat treatment process is adopted. As a result, the strength is further improved, but the plasticity of the material is often sacrificed, and the process is complicated and costly. It is only suitable for 2-3mm or less For other complex structural profiles, pipes, bars, forgings and large thickness plates and strips, it is difficult to process large deformation and cold work hardening, and it is difficult to improve the strength of structural materials, which greatly limits the application of high-strength aluminum alloy structural products. Development and Application
[0004] 7XXX series alloys such as 7A04, 7A09 and 7055 are high-strength alloys whose strength can reach 520-680MPa, but the density of such alloys is too large, about 2.78-2.86g / cm 3 , obviously not good for weight reduction design
Obviously, the density of the alloy is high, and the strength is as low as 379MPa, which cannot meet the design requirements for weight reduction.

Method used

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  • Aluminum alloy structure material and preparation thereof
  • Aluminum alloy structure material and preparation thereof
  • Aluminum alloy structure material and preparation thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0059] A method for preparing an aluminum alloy structural material, specifically:

[0060] 1. Alloy composition setting: (weight percentage):

[0061] AL-Mg-Si-Mn-Ti alloy:

[0062] Mg: 10.5% ~ 17.4%; and containing Be: 0.01% ~ 0.05%, based on magnesium charge;

[0063] Si: 1.0% to 5.0%;

[0064] Mn: 0.3% ~ 0.8%;

[0065] Ti: 0.15% to 0.25%;

[0066] Al: the balance of aluminum alloy and unavoidable impurities.

[0067] where the density estimate is calculated as:

[0068] The main contribution to the reduction of density ρ includes the combined effect of the contribution of the density value of each component element and the addition amount. Simplifies to:

[0069] ρ=G / Σ(W i / ρ i ) (1)

[0070] Where G is the total amount of the ingredient formula, which is calculated as 100% for the convenience of calculation;

[0071] W i Add weight percentage for each component in the ingredient formula;

[0072] ρ i is the density value of each component in the composition...

Embodiment 1

[0118] The ingredient formulations of Example 1, Example 2 and Example 3 are shown in Table 1.

[0119] Table 1 each embodiment chemical composition (wt%)

[0120]

[0121] The mechanical performance characteristics of each embodiment are shown in Table 2.

[0122] The characteristics of mechanical properties of each embodiment of table 2

[0123] Example

R m / N / mm 2

R p-1 / N / mm 2

A / %

ρ / g / cm 3

Example 1

555

485

32

2.53

Example 2

630

530

25

2.49

Example 3

670

595

11

2.48

[0124] The microstructure characteristics of each embodiment are shown in Table 3.

[0125] The microstructural characteristics of each embodiment of table 3

[0126]

[0127]

[0128] Take embodiment 2 as an example to do component design:

[0129] Density estimate calculation:

[0130] Al content is 100% - (15.0% + 3.0% + 0.5% + 0.20%) = 81.3%;

[0131] The density of Al is 2.699g / cm...

Embodiment 2

[0136] Then embodiment 2 alloy density:

[0137] ρ=G / Σ(W i / ρ i )=100 / (15.0 / 1.74+3.0 / 2.34+0.5 / 7.4+0.20 / 4.54+81.3 / 2.699)=2.48g / cm 3

[0138] Example 2 Alloy Strength Prediction Calculation:

[0139] R m =35MPa / %×W j +100~300MPa≥625MPa.

[0140] Taking Example 2 as an example to do batching calculation: smelting 120kg.

[0141] 1) The chemical composition of Example 2 is as follows:

[0142] Mg: 15.0%; Si: 3.0%; Mn: 0.50%; Ti: 0.20%; Al: the balance is aluminum alloy and other unavoidable impurities.

[0143] 2) The amount of each alloy element required in the alloy is:

[0144] According to the charge of 120 kg of furnace charge, the ingredients are calculated, and the weight of the alloy elements that need to be added is:

[0145] Mg: 18.0 kg; Si: 3.6 kg; Mn: 0.6 kg; Ti: 0.24 kg; Al: the balance is 120 kg - the total algebraic sum of the above alloy elements (22.44 kg) is 97.56 kg.

[0146] 3) Because silicon and manganese are added in the form of intermediate alloy...

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Abstract

The invention discloses an aluminum alloy structure material. The aluminum alloy structure material is Al-Mg-Si-Mn-Ti alloy and comprises the following elements based on a magnesium charging material as a benchmark in percentage by mass: 10.5-17.4% of Mg, 0.01-0.05% of Be, 1.0-5.0% of Si, 0.3-0.8% of Mn, 0.15-0.25% of Ti and the balance of Al and other unavoidable impurities. In the preparation process, the method comprises the following steps: putting the weighed charging material into a medium frequency smelting furnace for melting the alloy, degassing and purifying, pouring and carrying out spray depositing to obtain a round ingot blank; and performing extrusion processing, product processing and thermal processing to obtain the product. The aluminum alloy structure material is scientific and reasonable in compound design, simple in preparation process and short in technological process by adopting a spray deposition technology to prepare the low-density high-strength aluminum alloy metallurgy microstructure; the produced aluminum alloy has a mechanical property of the high-strength aluminum alloy and a low density of the aluminum lithium alloy and can be used for manufacturing the ground vehicles and space vehicle structure products.

Description

technical field [0001] The invention belongs to the technical field of metal alloy materials and preparation, and in particular relates to a low-density and high-strength aluminum alloy structural material and a preparation method thereof, which are applicable to the manufacture of ground vehicles and space vehicle structural products. Background technique [0002] Pure aluminum has the characteristics of low density, good thermal conductivity, good plasticity and corrosion resistance. It is often used to make various profiles and plates. However, pure aluminum has poor strength and is not suitable for structural materials. Therefore, people add various materials to pure aluminum. A series of aluminum alloys are obtained by adding different alloying elements to strengthen the performance of aluminum. [0003] Nowadays, people improve the strength and density characteristics of aluminum alloy materials by adding low-density alloying elements such as magnesium, lithium, and si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/08C22C1/03C22C1/06C22F1/047
CPCC22C1/026C22C1/03C22C1/06C22C21/08C22F1/047
Inventor 孙廷富薛跃军彭银江陈耘郭安振崔崇亮郭峰翟景张涛元涛
Owner NO 52 INST OF CHINA NORTH IND GRP CORP
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