High strength aluminum alloy capable of reducing porosity and dispersed shrinkage and preparation method thereof

A high-strength, aluminum alloy technology, applied in the field of high-strength aluminum alloys, can solve the problems of low hardenability, poor tempering resistance, and poor formability of large ingots, and achieve high heat treatability, strength and hardness. , the effect of enhancing the strength of the alloy

Inactive Publication Date: 2012-06-27
GUIZHOU ALUMINUM MATERIALS ENG TECHRES CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] 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 performance requirements or some special requirements. Performance (such as heat resistance, corrosion resistance), etc., is also a major defect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A high-strength aluminum alloy, by mass percentage, including 0.3% Si, 0.5% Fe, 0.1% Cu, 0.03% Mn, 0.35% Mg, 0.03% Cr, 0.1% Zn, 1.2% Mo, 0.09% N, 0.04% Li, 0.07% B, the balance is Al and unavoidable impurities, the content of each impurity does not exceed 0.05% of the total mass percentage, and the content of all impurities does not exceed the total mass 0.1% of the percentage.

[0023] The present invention also provides a preparation method of the high-strength aluminum alloy, adding Mo 2 N and LiBHEt 3 , including the following steps:

[0024] Step 1: Prepare materials according to the components of the high-strength aluminum alloy, including 0.3% Si, 0.5% Fe, 0.1% Cu, 0.03% Mn, 0.35% Mg, and 0.03% Cr in the mass percentage of the total product , 0.1% Zn;

[0025] Step 2: Add aluminum ingots or molten aluminum into the smelting furnace first, heat it to melt it completely, add the materials prepared in Step 1 first according to the formula ratio, make it complete...

Embodiment 2

[0030]A high-strength aluminum alloy, by mass percentage, including 0.5% Si, 0.4% Fe, 0.08% Cu, 0.02% Mn, 0.6% Mg, 0.02% Cr, 0.08% Zn, 1.5% Mo, 0.11% N, 0.06% Li, 0.08% B, the balance is Al and unavoidable impurities, the content of each impurity does not exceed 0.05% of the total mass percentage, and the content of all impurities does not exceed the total mass 0.1% of the percentage.

[0031] The present invention also provides a preparation method of the high-strength aluminum alloy, adding Mo 2 N and LiBHEt 3 , including the following steps:

[0032] Step 1: Prepare materials according to the components of the high-strength aluminum alloy, including 0.5% Si, 0.4% Fe, 0.08% Cu, 0.02% Mn, 0.6% Mg, and 0.02% Cr in the mass percentage of the total product , 0.08% Zn;

[0033] Step 2: Add aluminum ingots or molten aluminum into the smelting furnace first, heat it to melt it completely, add the materials prepared in Step 1 first according to the formula ratio, make it complet...

Embodiment 3

[0038] A high-strength aluminum alloy, in terms of mass percentage, including 0.7% Si, 0.25% Fe, 0.07% Cu, 0.01% Mn, 0.8% Mg, 0.15% Cr, 0.07% Zn, 1.8% Mo, 0.13% N, 0.07% Li, 0.1% B, the balance is Al and unavoidable impurities, the content of each impurity does not exceed 0.05% of the total mass percentage, and the content of all impurities does not exceed the total mass 0.1% of the percentage.

[0039] The present invention also provides a preparation method of the high-strength aluminum alloy, adding Mo 2 N and LiBHEt 3 , including the following steps:

[0040] Step 1: Prepare materials according to the components of the high-strength aluminum alloy, including 0.7% of Si, 0.25% of Fe, 0.07% of Cu, 0.01% of Mn, 0.8% of Mg, and 0.15% of Cr , 0.07% Zn;

[0041] Step 2: Add aluminum ingots or molten aluminum into the smelting furnace first, heat it to melt it completely, add the materials prepared in Step 1 first according to the formula ratio, make it completely dissolved a...

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Abstract

The invention discloses a high strength aluminum alloy capable of reducing porosity and dispersed shrinkage and a preparation method thereof, wherein the preparation method comprises the steps of: firstly heating an aluminum ingot or a molten aluminum solution to completely smelt the aluminum; adding Si, Fe, Cu, Mn, Mg, Cr and Zn, completely dissolving and smelting the elements; refining and maintaining at 700-1000 DEG C to obtain an alloy fused mass; performing a degasification purification treatment on the alloy fused mass by nitrogen or inert gas or mixed gas of nitrogen and inert gas in any proportion, and continuously filling the gas until the reaction is finished; meanwhile, adding Mo2N and LiBHEt3 powder in the alloy fused mass with the gas in a fluidization state; stirring to uniformly distribute the Mo2N and LiBHEt3 in the alloy fused mass and to fully react with the alloy fused mass; and stewing, regulating the temperature to 680-730 DEG C, discharging the alloy solution from the furnace, and casting the alloy solution. The preparation method of the invention has the advantages of overcoming the performance defects of the current aluminum alloy, improving the roughness, forming property and hardenability thereof, and providing a high-end base material for effective deep processing.

Description

technical field [0001] The invention relates to a high-strength aluminum alloy and a preparation method thereof. Background technique [0002] 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 performance requirements or some special requirements. Performance (such as heat resistance, corrosion resistance), etc., is also a major defect. These defects make it difficult to cross the technical breakpoint in the process of replacing heavy and strong materials and structures such as steel products in the field of engineering technology. [0003] Generally, porosity and shrinkage will occur in parts of castings with coarse grains and non-dense structures, such as connecting with shrinkage cavities near the inner gate of castings, or at the root of risers, thick hot joints and thin walls w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22C1/06C22C1/02
Inventor 门三泉张中可车云
Owner GUIZHOU ALUMINUM MATERIALS ENG TECHRES CENT
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