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Die-cast aluminum-silicon alloy and preparation method thereof

A technology of aluminum-silicon alloy and silicon alloy, which is applied in the field of preparation of aluminum alloy materials, can solve the problems of insufficient mechanical properties in as-cast and heat-treated states, and achieves prevention of the formation of needle-like β-Fe phase, high strength and plasticity, and improvement of The effect of formability

Inactive Publication Date: 2019-07-02
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problem of insufficient mechanical properties of the existing vacuum die-casting aluminum alloy materials in the as-cast state and heat-treated state. The primary purpose of the present invention is to provide a die-casting aluminum-silicon alloy with high strength and high toughness both in the as-cast state and in the heat-treated state of vacuum die-casting , another object is to provide the preparation method of the above-mentioned die-casting aluminum-silicon alloy

Method used

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  • Die-cast aluminum-silicon alloy and preparation method thereof
  • Die-cast aluminum-silicon alloy and preparation method thereof
  • Die-cast aluminum-silicon alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Step 1: Ingredients

[0021] Carry out batching according to table 1.

[0022] Table 1 Ingredients list

[0023]

[0024] Step 2: Smelting

[0025] Add high-purity aluminum into the melting furnace, and then raise the temperature by 150°C per hour to 670°C. After the alloy is completely melted, add high-purity silicon, pure magnesium and Al-Mn10 master alloy in sequence to ensure uniform alloy composition. Add AlSr10 master alloy and Al-10Ti-B master alloy to the molten aluminum, then add a commercial solid refining agent to the molten aluminum at a ratio of 4 per thousand, refine at 670-680°C, and remove with argon or nitrogen Air, stand still for 5 minutes and remove slag.

[0026] Step 3: Vacuum Die Casting

[0027] Using the smelted alloy, the mold preheating temperature is 180°C, the alloy pouring temperature is 675°C, the high injection speed is 2.0m / s, the boost pressure is 88MPa, and the vacuum degree is 55mbar.

[0028] Step Four: Heat Treatment

[002...

Embodiment 2

[0034] Step 1: Ingredients

[0035] Carry out batching according to table 3.

[0036] Table 3 Ingredients list

[0037]

[0038] Step 2: Smelting

[0039] Add high-purity aluminum into the melting furnace, and then raise the temperature by 150°C per hour to 690°C. After the alloy is completely melted, add high-purity silicon, pure magnesium and Al-Mn10 master alloy in sequence to ensure uniform alloy composition. Add AlSr10 master alloy and Al-10Ti-B master alloy to the molten aluminum, then add a commercial solid refining agent to the molten aluminum at a ratio of 4 per thousand, refine at 680-690°C, and remove with argon or nitrogen Air, stand still for 5 minutes and remove slag.

[0040] Step 3: Die Casting

[0041] Using the smelted alloy, the mold preheating temperature is 200°C, the alloy pouring temperature is 685°C, the high injection speed is 2.5m / s, the boost pressure is 78MPa, and the vacuum degree is 70mbar.

[0042] Step Four: Heat Treatment

[0043] The ...

Embodiment 3

[0048] Step 1: Ingredients

[0049] Carry out batching according to table 5.

[0050] Table 5 ingredient list

[0051]

[0052] Step 2: Smelting

[0053] Add high-purity aluminum into the melting furnace, and then raise the temperature by 150°C per hour to 680°C. After the alloy is completely melted, add high-purity silicon, pure magnesium and Al-Mn10 master alloy in sequence to ensure uniform alloy composition. Add AlSr10 master alloy and Al-10Ti-B master alloy to the molten aluminum, then add a commercial solid refining agent to the molten aluminum at a ratio of 4 per thousand, refine at 675-685°C, and remove with argon or nitrogen Air, stand still for 5 minutes and remove slag.

[0054] Step 3: Die Casting

[0055]Using the smelted alloy, the mold preheating temperature is 190°C, the alloy pouring temperature is 680°C, the high injection speed is 2.2m / s, the boost pressure is 80MPa, and the vacuum degree is 65mbar.

[0056] Step Four: Heat Treatment

[0057] The ca...

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Abstract

The invention discloses a die-cast aluminum-silicon alloy and a preparation method thereof. The die-cast aluminum-silicon alloy is prepared through vacuum die-casting and T6 heat treatment processes and prepared from the components in percentage by mass: 8.50-11.0% of silicon, 0.40-0.65% of magnesium, 0.45-0.65% of manganese, 0.10-0.15% of titanium, 100 ppm-200 ppm of strontium, smaller than or equal to 0.12% of iron, smaller than or equal to 0.10% of other elements, and the balance of aluminum. The prepared aluminum-silicon alloy has the high strength and toughness in both casting and heat treatment states, and is good in forming property and high in dimensional precision; as for large complex thin wall castings, high properties can be provided when the alloy is in the casting state, anddeformation in the heat treatment process is prevented; and the die-cast aluminum-silicon alloy and the preparation method thereof have very wide application prospects in the fields of automobiles, rail transportation and the like.

Description

technical field [0001] The invention belongs to the field of preparation of aluminum alloy materials, and in particular relates to a die-casting aluminum-silicon alloy with high strength and high toughness in both the cast state and the heat-treated state formed by vacuum die-casting and a preparation method thereof. Background technique [0002] For every 100kg reduction in body weight, the emission per 100 kilometers will be reduced by 8-11g. The current lightweight method of automobiles is to replace steel materials with lightweight materials, one of which is to use aluminum alloy materials, which have high specific strength and corrosion resistance. [0003] Die-casting has the advantages of high molding efficiency and high dimensional accuracy of castings. The traditional die-casting process is characterized by high speed and high pressure, which is prone to turbulent flow, which leads to gas entrapment and holes, which reduces the performance of castings. During high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/04C22C1/03B22D17/14C22F1/043
CPCB22D17/14C22C1/026C22C1/03C22C21/04C22F1/043
Inventor 赵海东胡宸张春姣
Owner SOUTH CHINA UNIV OF TECH
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