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A kind of high-temperature embrittlement-resistant free-cutting aluminum alloy and preparation method thereof

An aluminum alloy and high temperature resistance technology, which is applied in the field of high temperature embrittlement free-cutting aluminum alloy and its preparation, can solve the problems of human health and ecological environment hazards, insufficient heat resistance, high temperature brittleness, etc., to achieve increased strength, The effect of increasing the recrystallization temperature and improving the high temperature strength

Active Publication Date: 2020-04-28
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the addition of low-melting point metal elements can improve the machinability of aluminum alloys, these free-cutting aluminum alloys generally have the problems of low strength, high temperature brittleness, and insufficient heat resistance.
In addition, the existing free-cutting aluminum alloys usually contain low melting point metal elements such as lead, cadmium, and thallium, but lead, cadmium, and thallium are all toxic heavy metal elements, which will bring serious harm to human health and the ecological environment
Therefore, the existing free-machining aluminum alloys and their preparation methods still need to be improved and developed.

Method used

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  • A kind of high-temperature embrittlement-resistant free-cutting aluminum alloy and preparation method thereof
  • A kind of high-temperature embrittlement-resistant free-cutting aluminum alloy and preparation method thereof
  • A kind of high-temperature embrittlement-resistant free-cutting aluminum alloy and preparation method thereof

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preparation example Construction

[0050] The preparation method of the high-temperature embrittlement-resistant free-cutting aluminum alloy provided by the present invention is characterized in that it comprises the following steps:

[0051] Step 1: Select aluminum ingots, magnesium ingots, bismuth ingots, tin ingots, aluminum-silicon alloys, aluminum-manganese alloys, aluminum-copper alloys, aluminum-iron alloys, aluminum-chromium alloys, and aluminum-strontium alloy rods according to the composition and mass percentage of aluminum alloys and Al-Ti-B alloy rods as raw materials for batching;

[0052] Step 2: Heat and melt the aluminum ingot at 720-730°C, then add magnesium ingot, bismuth ingot, tin ingot, aluminum-silicon alloy, aluminum-manganese alloy, aluminum-copper alloy, aluminum-iron alloy and aluminum-chromium alloy, stir and melt to form aluminum alloy liquid;

[0053] The third step: use high-purity inert gas and sodium-free refining agent to carry out degassing and impurity removal treatment on al...

Embodiment 1

[0074] The aluminum alloy is composed of the following mass percentage components: Mg 1.1%, Si 0.8%, Mn 0.4%, Cu0.18%, Fe 0.16%, Cr 0.12%, Sr 0.045%, Ti 0.035%, B 0.007%, Sn 0.5% , Bi 0.4%, the balance is Al and unavoidable impurity elements, the individual content of impurity elements is ≤0.05%, and the total amount of impurity elements is ≤0.15%. The preparation method of aluminum alloy comprises the following steps:

[0075] The first step: according to the composition and mass percentage of aluminum alloy, select aluminum ingot with 99.7% aluminum content, magnesium ingot with 99.8% magnesium content, bismuth ingot with 99.9% bismuth content, tin ingot with 99.9% tin content, AlSi20 alloy, AlMn10 alloy, AlCu50 alloy, AlFe20 alloy, AlCr5 alloy, AlSr5 alloy rod and AlTi5B1 alloy rod are used as raw materials for batching;

[0076] Step 2: Heat and melt the aluminum ingot at 725°C, then add magnesium ingot, bismuth ingot, tin ingot, AlSi20 alloy, AlMn10 alloy, AlCu50 alloy, ...

Embodiment 2

[0085] The aluminum alloy is composed of the following mass percentages: Mg 1.2%, Si 0.6%, Mn 0.5%, Cu0.15%, Fe 0.2%, Cr 0.1%, Sr 0.05%, Ti 0.03%, B 0.006%, Sn 0.6% , Bi 0.3%, the balance is Al and unavoidable impurity elements, the individual content of impurity elements is ≤0.05%, and the total amount of impurity elements is ≤0.15%. The preparation method of aluminum alloy comprises the following steps:

[0086] The first step: according to the composition and mass percentage of aluminum alloy, select aluminum ingot with 99.7% aluminum content, magnesium ingot with 99.8% magnesium content, bismuth ingot with 99.9% bismuth content, tin ingot with 99.9% tin content, AlSi20 alloy, AlMn10 alloy, AlCu50 alloy, AlFe20 alloy, AlCr5 alloy, AlSr5 alloy rod and AlTi5B1 alloy rod are used as raw materials for batching;

[0087] Step 2: Heat and melt the aluminum ingot at 730°C, then add magnesium ingot, bismuth ingot, tin ingot, AlSi20 alloy, AlMn10 alloy, AlCu50 alloy, AlFe20 alloy a...

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Abstract

The invention provides a high-temperature-embrittlement-resistant free-cutting aluminum alloy and a preparation method thereof. The aluminum alloy is composed of the following components of, by mass,1.0-1.2% of Mg, 0.6-0.9% of Si, 0.3-0.5% of Mn, 0.15-0.2% of Cu, 0.15-0.2% of Fe, 0.1-0.15% of Cr, 0.04-0.05% of Sr, 0.03-0.04% of Ti, 0.006-0.008% of B, 0.4-0.6% of Sn, 0.3-0.5% of Bi and the balanceAl and unavoidable impurity elements. By optimizing and designing the composition and preparation process of the alloy, a continuous network Sn-Bi low-melting-point eutectic structure on the grain boundary is transformed into a discontinuous network, coarse needle-like Fe-rich phases and excess Si phases are transformed into fine grains which are dispersed in an aluminum matrix, grain boundary migration and dislocation motion are inhibited, the recrystallization temperature and high temperature stability of the free-cutting aluminum alloy are improved, and the problem of high temperature embrittlement of the free-cutting aluminum alloy is solved. The aluminum alloy has excellent cutting performance and high temperature resistance, does not contain heavy metal elements such as lead and cadmium, and belongs to environmental-friendly free-cutting aluminum alloys.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy preparation, and in particular relates to a high-temperature embrittlement-resistant free-cutting aluminum alloy and a preparation method thereof. Background technique [0002] Aluminum alloy has the advantages of low density, high specific strength, corrosion resistance, good thermal and electrical conductivity, easy processing and forming, and recyclability. It is widely used in construction, automobiles, electronics, electrical appliances, mechanical equipment and other fields. In the production and manufacturing process of many aluminum alloy parts, a large number of turning, milling, drilling, tapping and other cutting processes are required, such as automobile transmission valves, brake pistons, air-conditioning compressor pistons, mobile phone backplanes and middle frames, screws , Screws, pulleys, bearings and other aluminum alloy parts. [0003] The chips of traditional aluminum a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/08C22C1/03C22C1/06C22F1/047
CPCC22C1/026C22C1/03C22C1/06C22C21/08C22F1/047
Inventor 王顺成刘明阳李继林孙小燕
Owner GUANGDONG INST OF NEW MATERIALS
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