High-strength aluminum alloy obtained by removing inclusion through HfC and preparation method of aluminum alloy

An aluminum alloy, high-strength technology, applied in the field of high-strength aluminum alloy, can solve the problems of not meeting the requirements of mechanical properties, low hardenability of large ingots, poor tempering resistance, etc., to shorten the time of dispersion and uniformity, High heat treatability, strength and hardness enhancement 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] Therefore, 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 certain requirements. 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

[0030]A high-strength aluminum alloy, by mass percentage, including 0.2% Si, 0.35% Fe, 0.1% Cu, 0.1% Mn, 0.1% Cr, 0.45% Mg, 0.1% Zn, 0.1% Ti, 0.8% Hf, 0.05% C, the balance is 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.

[0031] The present invention also provides a method for preparing the high-strength aluminum alloy, adding HfC in a composite treatment manner, including the following steps:

[0032] Step 1: Prepare materials according to the components of the high-strength aluminum alloy, including 0.2-0.6% of Si, 0.35% or less of Fe, 0.1% or less of Cu, 0.1% or less of Mn, less than or equal to 0.1% of the total product mass percentage Equal to 0.1% Cr, 0.45-0.9% Mg, less than or equal to 0.1% Zn, less than or equal to 0.1% Ti;

[0033] Step 2: Add aluminum ingots or molten aluminum into the smelting furnace first, heat...

Embodiment 2

[0038] A high-strength aluminum alloy, by mass percentage, including 0.4% Si, 0.3% Fe, 0.08% Cu, 0.08% Mn, 0.06% Cr, 0.7% Mg, 0.07% Zn, 0.05% Ti, 1.3% Hf, 0.08% C, the balance is 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.

[0039] The present invention also provides a method for preparing the high-strength aluminum alloy, adding HfC in a composite treatment manner, including the following steps:

[0040] Step 1: Prepare materials according to the components of the high-strength aluminum alloy, including 0.4% Si, 0.3% Fe, 0.08% Cu, 0.08% Mn, 0.06% Cr, and 0.7% Mg in the mass percentage of the total product , 0.07% Zn, 0.05% Ti;

[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, mak...

Embodiment 3

[0046] A high-strength aluminum alloy, by mass percentage, including 0.6% Si, 0.25% Fe, 0.06% Cu, 0.09% Mn, 0.03% Cr, 0.9% Mg, 0.09% Zn, 0.05% Ti, 1.8% Hf, 0.12% C, the balance is 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.

[0047] The present invention also provides a method for preparing the high-strength aluminum alloy, adding HfC in a composite treatment manner, including the following steps:

[0048] Step 1: Prepare materials according to the components of the high-strength aluminum alloy, including 0.6% of Si, 0.25% of Fe, 0.06% of Cu, 0.09% of Mn, 0.03% of Cr, and 0.9% of Mg in the mass percentage of the total product , 0.09% Zn, 0.05% Ti;

[0049] Step 2: First add aluminum ingots or molten aluminum into the smelting furnace, heat it to melt it completely, add the raw materials in step 1 according to the formula r...

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Abstract

The invention discloses a high-strength aluminum alloy obtained by removing inclusion through HfC and a preparation method of the aluminum alloy. The method comprises the following steps of: heating aluminum ingots or molten aluminum till complete melting; adding Si, Fe, Cu, Mn, Mg, Cr, Zn and Ti, and completely dissolving and melting the elements; preserving the heat at the temperature of between 700 and 1,000 DEG C after refining, and obtaining an alloy melt; performing degassing purification operation on the alloy melt by using nitrogen or inert gas or mixed gas of the nitrogen and the inert gas in a random ratio, and continuously introducing the gas till the reaction is finished; adding HfC powder into the alloy melt in a fluidized form together with the gas; stirring to make the HfC distributed uniformly in the alloy melt and fully reacted with the alloy melt; and standing, regulating the temperature to 680-730 DEG C, and discharging the molten alloy for casting. By the method, the defects of the properties of the conventional aluminum alloy can be overcome, the toughness, the forming property and the hardening capacity of the aluminum alloy are improved, and a high-end base material is provided for efficient deep processing.

Description

technical field [0001] The invention relates to a high-strength aluminum alloy and a preparation method thereof. Background technique [0002] Various inclusions often appear in aluminum alloy castings, mainly including oxide inclusions, molding materials and flux slag inclusions. Among them, aluminum oxide inclusions are the most common. In Mg-containing aluminum alloys, most of the inclusions are a mixture of alumina and magnesia, so in the aluminum alloy smelting process, the content of oxide inclusions is one of the important indicators reflecting the metallurgical quality of molten aluminum. [0003] In appearance and fracture, oxide inclusions generally exist in the form of gray to black small flakes, some of which have a certain interface with the alloy matrix, and some oxides are distributed along the grain, and the plane and crack morphology of intergranular separation can be seen in the fracture under high magnification , since the oxide isolates the continuity o...

Claims

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Application Information

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