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A kind of high-strength corrosion-resistant 7-series aluminum alloy and casting method thereof

A technology of aluminum alloy and hexagonal boron nitride, which is applied in the field of aluminum alloy, can solve problems such as poor corrosion resistance, and achieve the effects of improving corrosion resistance, reducing cracks in ingots, and low thermal expansion coefficient

Active Publication Date: 2022-01-11
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the biggest defect of the 7-series aluminum alloy as a structural material is its poor corrosion resistance. The strength and corrosion resistance of the 7-series aluminum alloy are a pair of contradictions. In practical applications, part of the strength is usually sacrificed for corrosion resistance. promote

Method used

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  • A kind of high-strength corrosion-resistant 7-series aluminum alloy and casting method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The weight percentage of each element of the aluminum alloy chemical composition of embodiment 1 is as shown in table 1, and casting method comprises the following steps:

[0050] (1) Batching: According to the weight percentage of each component in Table 1, batching is carried out.

[0051] (2) Melting: raise the melting temperature to 350°C, add aluminum ingots, magnesium ingots, zinc ingots, aluminum-copper master alloys and aluminum-yttrium master alloys, raise the temperature, and control the melting temperature to 770°C. During the smelting process, the raw materials start to melt and then open Electromagnetic stirring ensures the rapid melting of raw materials in the furnace and uniform temperature and composition; after melting, cool down to semi-solid state, add h-BNμ@Ni preheated to 540°C, and continue to stir evenly. The stirring speed is 350 r / min, and the stirring time is 20min.

[0052] (3) Refining: add refining agent to the melt for refining, and let st...

Embodiment 2

[0058] The weight percent of each element of the aluminum alloy chemical composition of embodiment 2 is as shown in table 1, and casting method comprises the following steps:

[0059] (1) Batching: According to the weight percentage of each component in Table 1, batching is carried out.

[0060] (2) Melting: raise the melting temperature to 350°C, add aluminum ingots, magnesium ingots, zinc ingots, aluminum-copper master alloys and aluminum-yttrium master alloys, raise the temperature, and control the melting temperature to 780°C. During the smelting process, the raw materials start to melt and then open Electromagnetic stirring ensures the rapid melting of raw materials in the furnace and uniform temperature and composition; after melting, cool down to semi-solid, add h-BNμ@Ni preheated to 530°C, and continue to stir evenly. The stirring speed is 350 r / min, and the stirring time is 20min.

[0061] (3) Refining: add refining agent to the melt for refining, and let stand for 1...

Embodiment 3

[0067] Table 1 shows the weight percentage of each element in the chemical composition of the aluminum alloy in Example 3, and refer to Example 1 for the casting method.

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Abstract

The invention belongs to the technical field of aluminum alloys, in particular to a high-strength, corrosion-resistant 7-series aluminum alloy and a casting method thereof. The 7-series aluminum alloy includes the following components: Zn 6%~6.7%, Mg 2%~2.5%, Cu 2%~2.5%, Y 0.05%~2%, nickel-coated hexagonal boron nitride micro-particles, denoted as h‑BNμ@Ni 0.05%~2.5%, Si≤0.25%, Fe≤0.12%, the balance is aluminum and unavoidable impurities. The present invention properly increases the content of Zn and Mg, reduces the content of Cu, and adds an appropriate amount of rare earth element Y and reinforcing particles h-BNμ@Ni by rationally optimizing the content and ratio of Zn, Mg, and Cu elements in the aluminum alloy to achieve Reduce the cracks of the ingot, refine the grain, obtain good toughness and high strength, and improve the effect of corrosion resistance, so as to ensure that the aluminum alloy has high strength and good corrosion resistance at the same time.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloys, in particular to a high-strength, corrosion-resistant 7-series aluminum alloy and a casting method thereof. Background technique [0002] 7 series (also known as 7000 series or 7××× series) aluminum alloy, commonly known as superhard aluminum alloy, is an alloy of aluminum, zinc, copper, and magnesium. It has high specific strength, specific stiffness, and low density, and is easy to process and shape. It is widely used in the fields of aviation, spaceflight, weapons and transportation, etc. However, with the development of science and technology, the requirements of modern industry on materials are becoming more and more stringent, and the 7-series aluminum alloys are also facing more and more challenges. Not only are they required to have high strength, they must also have good corrosion resistance and Excellent fracture toughness. [0003] However, the biggest defect of the 7-series ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/10C22C1/03
Inventor 黄粒王少华李宏伟陈军洲臧金鑫何维维戴圣龙
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS