A kind of damage-resistant aluminum alloy and its preparation method

An aluminum alloy and damage-resistant technology, applied in the field of damage-resistant aluminum alloys and their preparation, can solve the problems of difficulty in improving the comprehensive properties of damage-resistant aluminum alloy profiles, and achieve the effects of realizing large-scale industrial production, improving fracture toughness, and reducing size

Active Publication Date: 2018-06-26
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The object of the present invention is to provide a damage-resistant aluminum alloy and its preparation method. By adjusting the content of main alloy elements and adding new alloy elements, an aluminum alloy with high fatigue crack growth resistance and excellent mechanical properties is obtained, which solves the problem of existing problems. It is difficult to improve the comprehensive performance of damage-resistant aluminum alloy profiles

Method used

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  • A kind of damage-resistant aluminum alloy and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) The alloy composition is: Cu: 3.6%, Mg: 1.0%, Mn: 0.5%, Zr: 0.11%, Er: 0.15%, the balance is Al and trace impurity elements, and the total content of the impurity elements is less than 0.1% .

[0033] (2) Prepare pure aluminum, pure magnesium, Al-Cu master alloy, Al-Mn master alloy, Al-Zr master alloy, and Al-Er master alloy according to the designed components, remove impurities on the surface and then dry them. The purity of the pure aluminum is greater than or equal to 99.99%, and the purity of the pure magnesium is greater than or equal to 99.99%.

[0034] (2) The metal aluminum is heated to 793°C ± 5°C, and when the charge begins to soften and settle down, then a covering agent is added in an amount of 0.55% of the total weight of the metal to form an aluminum melt with a covering agent on the surface. The covering agent is composed of the following components by weight: 33% Al 2 O 3 , 7% CaO, 35% charcoal, 12% KCl, 8% NaCl, 5% Na 3 AlF 6 .

[0035] (3) A...

Embodiment 2

[0043] (1) The alloy composition is: Cu: 3.8%, Mg: 1.1%, Mn: 0.5%, Zr: 0.12%, Er: 0.15%, the balance is Al and trace impurity elements, the total content of the impurity elements is less than 0.1% %.

[0044] (2) According to the designed components, get pure aluminum, pure magnesium, Al-Cu master alloy, Al-Mn master alloy, Al-Zr master alloy, Al-Er master alloy, remove the impurities on the surface and then dry it. The purity of the pure aluminum is ≥99.99%, and the purity of the pure magnesium is ≥99.99%.

[0045] (2) Raise the temperature of the metal aluminum to 793°C±5°C, when the charge begins to soften and settle down, then add a covering agent in an amount of 0.55% of the total weight of the metal to form an aluminum melt with a covering agent on the surface. The covering agent is composed of the following components by weight: 33% Al 2 o 3 , 7% CaO, 35% charcoal, 12% KCl, 8% NaCl, 5% Na 3 AlF 6 .

[0046] (3) Add Al-Zr master alloy, Al-Cu master alloy and Al-Mn ...

Embodiment 3

[0054] (1) The alloy composition is: Cu: 4.0%, Mg: 1.1%, Mn: 0.5%, Zr: 0.13%, Er: 0.13%, the balance is Al and trace impurity elements, the total content of the impurity elements is less than 0.1% %.

[0055] (2) According to the designed components, get pure aluminum, pure magnesium, Al-Cu master alloy, Al-Mn master alloy, Al-Zr master alloy, Al-Er master alloy, remove the impurities on the surface and then dry it. The purity of the pure aluminum is ≥99.99%, and the purity of the pure magnesium is ≥99.99%.

[0056] (2) Raise the temperature of the metal aluminum to 793°C±5°C, when the charge begins to soften and settle down, then add a covering agent in an amount of 0.55% of the total weight of the metal to form an aluminum melt with a covering agent on the surface. The covering agent is composed of the following components by weight: 33% Al 2 o 3 , 7% CaO, 35% charcoal, 12% KCl, 8% NaCl, 5% Na 3 AlF 6 .

[0057] (3) Add Al-Zr master alloy, Al-Cu master alloy and Al-Mn ...

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Abstract

The invention provides a damage-resistant aluminum alloy and a preparation method thereof. The damage-resistant aluminum alloy comprises the following components by mass percent: 3.6-4.3%of Cu, 1.0-1.6% of Mg, 0.3-0.8% of Mn, 0.1-0.15% of Zr, 0.1-0.2% of Er, and the balance Al and trace impurity elements, wherein the total content of the trace impurity elements is less than 0.1%. Through adjusting the content of a main alloy element and adding new alloy elements, the aluminum alloy having high resistance to fatigue crack extension and excellent mechanical property is obtained, and the problem that the comprehensive performance of the conventional damage-resistant aluminum alloy is difficult to improve is solved. With the adoption of a water atomization and steam heating mode for homogenizing treatment, the homogenizing time is shortened, the size of a second-phase particle is reduced, and significant effect is exerted on the improvement of the material fracture toughness. The damage-resistant aluminum alloy is simple in technology and low in cost, and large-scale industrial production can be realized easily.

Description

technical field [0001] The invention relates to an aluminum alloy and a preparation method thereof, in particular to a damage-resistant aluminum alloy and a preparation method thereof. Background technique [0002] Aluminum alloy is the most widely used non-ferrous metal structural material in the industry. It has low density, high specific strength, and excellent thermal conductivity, corrosion resistance, welding and processing properties. It is widely used in mechanical engineering, aerospace, etc. field. [0003] With the development of the new generation of aircraft durability / damage tolerance design ideas, the reliability, service life, safety and maintainability of the main structure of the aircraft body are increasingly required for damage resistance performance. It is urgent to adopt high fracture toughness. , new damage-resistant materials with fatigue resistance and low fatigue crack growth rate, especially in the lower wing siding girders, the lower edge strips ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/16C22C1/03C22C1/06C22F1/057
Inventor 伊琳娜吴秀亮陈高红汝继刚臧金鑫
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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