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Fine-grain aluminum alloy and preparation method and application thereof

An aluminum alloy and fine-grain technology, applied in the field of aluminum alloys, can solve the problems of reducing the deformation properties, poor tensile properties and deformation properties of aluminum alloys, and declining mechanical properties of aluminum alloys, and achieve excellent extrusion properties and excellent tensile properties. , The effect of excellent thermal fatigue resistance

Pending Publication Date: 2022-04-15
GUANGDONG HOSHION IND ALUMINUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The grain size and alloy type in aluminum alloy have a significant impact on the performance of aluminum alloy; for example: if the grain size is large (coarse grain), the aluminum alloy is more likely to cause stress concentration at the grain boundary during the load-bearing process , resulting in sudden intergranular cracking, that is, poor tensile properties and deformation properties; at the same time, due to the short path of crack propagation, coarse grains will accelerate crack growth, and eventually cause the load-bearing profile to rupture, bringing safety hazards, that is, It is said that the coarse grain will reduce the deformation performance of aluminum alloy to a certain extent.
In addition, during the heat-bearing process of the aluminum alloy, the grains in it usually re-grow, that is, from fine grains to coarse grains, which eventually leads to a decrease in the mechanical properties of the aluminum alloy, that is to say, the growth of the grains will lead to the deterioration of the aluminum alloy. poor thermal fatigue resistance
[0004] Among the aluminum alloys obtained by related technologies, it is difficult to meet the requirements of fine grains, and it is even more difficult to meet the requirements of aluminum alloys not to grow grains in a heat-bearing environment

Method used

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  • Fine-grain aluminum alloy and preparation method and application thereof
  • Fine-grain aluminum alloy and preparation method and application thereof
  • Fine-grain aluminum alloy and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0113] In this embodiment, a fine-grained aluminum alloy is prepared, and the specific process is as follows:

[0114] S1. Casting:

[0115]S1a. Melting aluminum ingots at 780-800°C (the set temperature is 790°C, but the actual temperature during the process may fluctuate within the range of 780-800°C);

[0116] S1b. According to the ratio in Table 1, add Al-Si master alloy, magnesium ingot, Al-Mo master alloy, Al-Zr master alloy, red copper, Mn agent, Cr agent and Fe agent to the melt obtained in step S1a;

[0117] S1c. According to the ratio of refining agent: melt = 2kg: 1 ton, add refining agent to the melt obtained in step S1b for refining; the refining temperature is 730°C, and the refining time is 30 minutes. Pass argon gas (purity ≥ 99.999%) into the body for stirring, exhaust, and then slag removal;

[0118] S1d. The composition of the melt in the adjustment step S1c meets the requirements of Table 1 (except titanium), and then adds an Al-Ti master alloy to control ...

Embodiment 2

[0131] In this embodiment, a fine-grained aluminum alloy is prepared, and the specific process is as follows:

[0132] S1. Casting:

[0133] S1a. melting the aluminum ingot at 780-800°C (same as Example 1);

[0134] S1b. According to the ratio in Table 1, add Al-Si master alloy, magnesium ingot, Al-Mo master alloy, Al-Zr master alloy, red copper, Mn agent, Cr agent and Fe agent to the melt obtained in step S1a;

[0135] S1c. According to the ratio of refining agent: melt = 2kg: 1 ton, add refining agent to the melt obtained in step S1b for refining; the refining temperature is 730°C, and the refining time is 30 minutes. Pass argon gas (purity ≥ 99.999%) into the body for stirring, exhaust, and then slag removal;

[0136] S1d. The composition of the melt in the adjustment step S1c meets the requirements of Table 1 (except titanium), and then adds an Al-Ti master alloy to control the Ti content to 0.015%;

[0137] S1e. Within 10 minutes after the end of step S1d, cast the mel...

Embodiment 3

[0149] In this embodiment, a fine-grained aluminum alloy is prepared, and the specific process is as follows:

[0150] S1. Casting:

[0151] S1a. melting the aluminum ingot at 780-800°C (same as Example 1);

[0152] S1b. According to the ratio in Table 1, add Al-Si master alloy, magnesium ingot, Al-Mo master alloy, Al-Zr master alloy, red copper, Mn agent, Cr agent and Fe agent to the melt obtained in step S1a;

[0153] S1c. According to the ratio of refining agent: melt = 2kg: 1 ton, add refining agent to the melt obtained in step S1b for refining; the refining temperature is 730°C, and the refining time is 30 minutes. Pass argon gas (purity ≥ 99.999%) into the body for stirring, exhaust, and then slag removal;

[0154] S1d. The composition of the melt in the adjustment step S1c meets the requirements of Table 1 (except titanium), and then adds an Al-Ti master alloy to control the Ti content to 0.015%;

[0155] S1e. Within 10 minutes after the end of step S1d, cast the mel...

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Abstract

The invention discloses a fine-grain aluminum alloy and a preparation method and application thereof. The invention relates to a fine grain aluminum alloy which comprises the following components in percentage by mass: 0.02-0.08% of zirconium; 0.10 to 0.13 percent of chromium; 0.02 to 0.08% of molybdenum; 0.01 to 0.03 percent of titanium; 0.05% to 0.30% of copper; 0.25 to 0.30 percent of manganese; 0.15%-0.25% of iron; 0.78 to 0.88% of silicon; 0.62 to 0.82 percent of magnesium; and the balance aluminum and impurities. The aluminum alloy with the grain grade larger than or equal to 4 can be obtained by adjusting the variety and content of the components, and meanwhile, the special alloy phase can inhibit growth of grains in the heat bearing environment to a certain extent.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloys, and in particular relates to a fine-grained aluminum alloy and a preparation method and application thereof. Background technique [0002] Aluminum alloy is the most widely used non-ferrous metal structural material in industry. Because of its light weight and corrosion resistance, it has been widely used in aviation, aerospace, automobile, machinery manufacturing, shipbuilding, chemical industry and household small electronics. application. [0003] The grain size and alloy type in aluminum alloy have a significant impact on the performance of aluminum alloy; for example: if the grain size is large (coarse grain), the aluminum alloy is more likely to cause stress concentration at the grain boundary during the load-bearing process , resulting in sudden intergranular cracking, that is, poor tensile properties and deformation properties; at the same time, due to the short path of crack pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/02C22C21/08C22C1/02
Inventor 宋海海杨干周达科丁小理李建湘李信
Owner GUANGDONG HOSHION IND ALUMINUM CO LTD
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