Zn-containing medium-strength high-ductility die-cast aluminum alloy and preparation method thereof

A technology for casting aluminum alloy and casting aluminum alloy, applied in the field of metal materials, can solve problems such as being unsuitable for die-casting, restricting alloy plasticity, etc., and achieve the effects of low cost, improving alloy plasticity, and promoting transformation

Active Publication Date: 2020-11-24
肇庆南都再生铝业有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the hypoeutectic Al-Si alloy represented by A356 has medium strength and plasticity. After heat treatment, the elongation can reach more than 10%, but due to the low Si content in the alloy (~7%), it is not suitable for die casting. Forming: eutectic Al-Si alloy represented by German SF36 (domestic brand is AlSi10

Method used

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  • Zn-containing medium-strength high-ductility die-cast aluminum alloy and preparation method thereof
  • Zn-containing medium-strength high-ductility die-cast aluminum alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The design composition is: Al-10% Si-5.5% Zn-0.6% Fe-0.3% Mn-0.02% Sr; that is, 10% Si, 5.5% Zn, 0.6% Fe, 0.3% Mn, 0.02% Sr and the balance are composed of Al.

[0023] (1) Proportionate ingredients, 85% of the aluminum ingots by mass fraction, all Si ingots, Fe agent, Mn agent, etc. are put into the smelting furnace, and the temperature is raised to 780 ° C;

[0024] (2) After the raw materials in the furnace are completely melted, add the remaining aluminum ingots and Zn ingots, and stir the melt, while the temperature in the furnace drops to 700°C;

[0025] (3) Sampling and testing the alloy composition in the middle of the melt, comparing the design composition with the measured composition, and adjusting the alloy composition to the design range;

[0026] (4) Press the aluminum foil-wrapped and preheated Al-Sr master alloy into the melt with a titanium tool, and slowly stir the melt;

[0027] (5) Spray the refining agent into the melt with high-purity nitrogen as...

Embodiment 2

[0029] The design composition is: Al-12% Si-4.1% Zn-0.8% Fe-0.15% Mn-0.03% Sr, that is, 12% Si, 4.1% Zn, 0.8% Fe, 0.15% Mn, 0.03% Sr and the balance are composed of Al.

[0030] (1) Dosing in proportion, 90% of the aluminum ingot by mass fraction, all Si ingots, Fe agent, Mn agent, etc. are put into the smelting furnace, and the temperature is raised to 800 ° C;

[0031] (2) After the raw materials in the furnace are completely melted, add the remaining aluminum ingots and Zn ingots, and stir the melt, while the temperature in the furnace drops to 720°C;

[0032] (3) Sampling and testing the alloy composition in the middle of the melt, comparing the design composition with the measured composition, and adjusting the alloy composition to the design range;

[0033] (4) Press the aluminum foil-wrapped and preheated Al-Sr master alloy into the melt with a titanium tool, and slowly stir the melt;

[0034] (5) Spray the refining agent into the melt with high-purity nitrogen as a c...

Embodiment 3

[0036] The design composition is: Al-11% Si-7.0% Zn-0.5% Fe-0.4% Mn-0.02% Sr, that is, 11% Si, 7.0% Zn, 0.5% Fe, 0.4% Mn, 0.02% Sr and the balance are composed of Al.

[0037] (1) Proportionate batching, wherein 70% of the mass fraction of aluminum ingots, all Si ingots, Fe agent, Mn agent, etc. are put into the smelting furnace, and the temperature is raised to 760 ° C;

[0038] (2) After the raw materials in the furnace are completely melted, add the remaining aluminum ingots and Zn ingots, and stir the melt, while the temperature in the furnace drops to 710°C;

[0039] (3) Sampling and testing the alloy composition in the middle of the melt, comparing the design composition with the measured composition, and adjusting the alloy composition to the design range;

[0040] (4) Press the aluminum foil-wrapped and preheated Al-Sr master alloy into the melt with a titanium tool, and slowly stir the melt;

[0041] (5) Spray the refining agent into the melt with high-purity nitrog...

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Abstract

The invention discloses a Zn-containing medium-strength high-ductility die-cast aluminum alloy and a preparation method thereof, and belongs to the field of metal materials. The invention provides a casting aluminum alloy material which is medium in strength, is high in ductility, is free of thermal treatment and is suitable for die-cast formation as well as a preparation method thereof. The medium-strength high-ductility die-cast aluminum alloy consists of the following chemical components in percentage by weight: 10.0-13.0% of Si, 4.1-7.1% of Zn, 0.5-0.8% of Fe, 0.1-0.4% of Mn, 0.02-0.04% ofSr, less than or equal to 0.01% of Mg, less than or equal to 0.01% of Cu, less than or equal to 0.15% of other impurity elements, and the balance of Al. The preparation method comprises the followingsteps: smelting, sampling to rest, regulating alloy components, adding intermediate alloy to refine, de-slagging and casting. Through thermodynamic calculation, content range of Si, Fe and Mn of ternary eutectic Al-Si-Al(FeMn)Si is determined to reduce adverse effects, on alloy plasticity, of Mn and Fe; and Sr is the most common and effective eutectic silicon modifier, so that eutectic silicon ispromoted to convert to fine fibers from thick faller gills, and therefore, alloy plasticity is further improved.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to a Zn-containing medium-strength and high-toughness die-casting aluminum alloy and a preparation method thereof. Background technique [0002] Cast aluminum alloy has the advantages of excellent casting molding and air tightness, low thermal expansion coefficient, good weldability and machining characteristics, and is widely used in automobiles, motorcycles, aerospace, communications and other fields. Among them, the amount of cast aluminum alloy in the automotive field accounts for more than 85% of the total aluminum consumption. Typical components include engine block, cylinder head, clutch housing, oil pan, engine bracket, etc. [0003] At present, cast aluminum alloys mainly include Al-Si series, Al-Cu series, Al-Mg series and Al-Zn series, among which Al-Si series cast aluminum alloys are the most commonly used, accounting for more than 85% of the total aluminum alloy castings....

Claims

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Application Information

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IPC IPC(8): C22C21/04C22C1/03
CPCC22C21/04C22C1/03C22C1/026
Inventor 宋东福乡家发张卫文周立智叶猛刘秋霞黄正华张大童
Owner 肇庆南都再生铝业有限公司
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