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Co2N-doped aluminium alloy and smelting method thereof

An aluminum alloy and alloy technology, applied in the field of high-strength aluminum alloys, can solve the problems of not meeting the requirements of mechanical properties, low hardenability of large ingots, poor formability, etc., to achieve high heat treatability, improve high temperature strength and Corrosion resistance, strength and hardness increase effect

Inactive Publication Date: 2013-04-10
GUIZHOU ALUMINUM MATERIALS ENG TECHRES CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] It can be seen that in addition to the poor formability of the current aluminum alloy materials when casting large ingots, the hardenability of large ingots during heat treatment is not high, the tempering resistance is poor, and they cannot meet higher mechanical property requirements. Or some special properties (such as heat resistance, corrosion resistance), etc., are also major defects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A high-strength aluminum alloy, by mass percentage, including 0.7% Si, 0.5% Fe, 0.1% Cu, 0.4% Mn, 0.4% Mg, 0.2% Zn, 0.2% Ti, 1.8% Co, 0.21% N, the balance being Al and unavoidable impurities, the content of each impurity is not more than 0.05% of the total mass percentage, and the content of all impurities is not more than 0.15% of the total mass percentage.

[0028] The present invention also provides a preparation method of the high-strength aluminum alloy, adding Co 2 N, including the following steps:

[0029] Step 1: Add aluminum ingots or molten aluminum to the smelting furnace, heat it to melt it completely,

[0030] Step 2: Prepare materials according to the components of the high-strength aluminum alloy, including 0.7% of Si, 0.5% of Fe, 0.1% of Cu, 0.4% of Mn, 0.4% of Mg, and 0.2% of Zn in the mass percentage of the total product , 0.2% Ti; make it completely dissolved and melted,

[0031] Step 3: heat preservation at 700-1000°C after refining to obtain allo...

Embodiment 2

[0036] A high-strength aluminum alloy, by mass percentage, including 0.9% Si, 0.4% Fe, 0.08% Cu, 0.6% Mn, 0.6% Mg, 0.1% Zn, 0.1% Ti, 2.2% Co, 0.26% N, the balance being Al and unavoidable impurities, the content of each impurity is not more than 0.05% of the total mass percentage, and the content of all impurities is not more than 0.15% of the total mass percentage.

[0037] The present invention also provides a preparation method of the high-strength aluminum alloy, adding Co 2 N, including the following steps:

[0038] Step 1: First add aluminum ingots or molten aluminum liquid into the melting furnace, heat it to melt it completely,

[0039] Step 2: Prepare materials according to the components of the high-strength aluminum alloy, including 0.9% of Si, 0.4% of Fe, 0.08% of Cu, 0.6% of Mn, 0.6% of Mg, and 0.1% of Zn in the mass percentage of the total product , 0.1% Ti, so that it is completely dissolved and melted,

[0040] Step 3: heat preservation at 700-1000°C after r...

Embodiment 3

[0045] A high-strength aluminum alloy, by mass percentage, including 1.3% Si, 0.35% Fe, 0.07% Cu, 0.8% Mn, 0.8% Mg, 0.09% Zn, 0.12% Ti, 2.8% Co, 0.33% N, the balance being Al and unavoidable impurities, the content of each impurity is not more than 0.05% of the total mass percentage, and the content of all impurities is not more than 0.15% of the total mass percentage.

[0046] The present invention also provides a preparation method of the high-strength aluminum alloy, adding Co 2 N, including the following steps:

[0047] Step 1: First add aluminum ingots or molten aluminum liquid into the melting furnace, heat it to melt it completely,

[0048] Step 2: Prepare materials according to the components of the high-strength aluminum alloy, including 1.3% of Si, 0.35% of Fe, 0.07% of Cu, 0.8% of Mn, 0.8% of Mg, and 0.09% of Zn in the mass percentage of the total product , 0.12% Ti, so that it is completely dissolved and melted,

[0049] Step 3: heat preservation at 700-1000°C a...

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Abstract

The present invention discloses a Co2N-doped aluminium alloy and a smelting method thereof. The method comprises: heating aluminium ingots or molten aluminium liquid to completely melt the material; adding Si, Fe, Cu, Mn, Mg, Zn and Ti to the resulting molten material to completely dissolve and melt the mixed materials; after refining, carrying out heat preservation at a temperature of 700-1000 DEG C to obtain an alloy melt; adopting nitrogen or inert gas or mixed gas to carry out gas removing and purifying operation for the alloy melt, and continuously introducing the gas until the reaction is completed, wherein the nitrogen and the inert gas are mixed according to any ratio to obtain the mixed gas; adding Co2N powder to the alloy melt along with the gas in the fluidization manner; carrying out stirring, such that the Co2N is uniformly distributed in the alloy melt, and completely reacts with the alloy melt; standing, and adjusting the temperature to 680-730 DEG C, removing the alloyliquid from the furnace, and carrying out casting production. With the present invention, the performance disadvantages of the aluminium alloy in the prior art can be overcome, the strength and toughness, the formability and the hardenability of the aluminium alloy can be improved, and the high-end substrate is provided for the efficient deep processing.

Description

technical field [0001] The invention relates to a high-strength aluminum alloy and a preparation method thereof. Background technique [0002] In the existing aluminum alloys, the components with high density in the alloy components or compounds will precipitate in the lower part of the casting, and the components with low density will float in the upper part. For example, Ti, a refractory metal, and Al are added to refine the grains to form a high-melting flake compound Al. 3 Ti will crystallize out of the alloy liquid earlier, and when it grows larger, it will easily sink to produce local density segregation. When the segregation is serious, you can see a white and bright gray compound with a smooth surface on the fracture of the casting. Coarse primary silicon in crystalline Al-Si aluminum alloy is also easy to form segregation due to its low density. [0003] In addition, when this alloy liquid is stirred unevenly before pouring, it will cause eutectic segregation. In ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/00C22C1/02C22C1/10
Inventor 门三泉车云张中可李祥
Owner GUIZHOU ALUMINUM MATERIALS ENG TECHRES CENT