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High-performance semi-solid die cast aluminum alloy and preparation method thereof

A cast aluminum alloy, semi-solid technology, applied in the field of aluminum alloy processing, can solve the problems of product scrap, high heat treatment cost, air bubbles, etc.

Pending Publication Date: 2020-01-21
ZHUHAI RUNXINGTAI ELECTRICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, aluminum alloys for semi-solid die-casting are mainly Al-Si series cast aluminum alloys such as ZL101, A356, ADC10, and ADC12. The mechanical properties of semi-solid die-casting products are low, and it is difficult to meet the high-performance strength requirements. It is necessary to perform T6 heat treatment on the product, and improve the tensile strength and hardness of the product through solid solution strengthening; for example, the conventional semi-solid aluminum alloy material adopts extrusion die-casting process After production, T6 solid solution strengthening heat treatment is carried out, but T6 heat treatment has higher requirements on the internal quality of the product. The internal pores and shrinkage of the product will cause air bubbles during the heat treatment process to cause the product to be scrapped, and the T6 heat treatment time is 8-12 hours, and the heat treatment cost is high. It is difficult to meet the high-efficiency and low-cost production requirements of semi-solid extrusion die-casting

Method used

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  • High-performance semi-solid die cast aluminum alloy and preparation method thereof
  • High-performance semi-solid die cast aluminum alloy and preparation method thereof
  • High-performance semi-solid die cast aluminum alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The content of each component of high-performance semi-solid die-casting aluminum alloy is expressed in weight percentage as follows: Si 6.00%, Mg0.15%, Cu 0.05%, Ti 0.01%, Mn 0.10%, Sr 0.01%, Fe≤0.20%, impurity elements The sum is <0.15, and the rest is Al. The preparation method of the high-performance semi-solid die-casting aluminum alloy comprises the following steps:

[0045] 1S batching and smelting: According to the above composition, the raw materials are 99.9% instant silicon, 99.95% magnesium ingot, 99.99% electrolytic copper, 99.8% aluminum ingot, Al-10Ti alloy, Al-10Mn alloy, Al-10Sr alloy, Heating and smelting the prepared raw materials to obtain molten aluminum alloy, wherein the smelting temperature is 760°C;

[0046] 2S semi-solid slurry preparation: prepare the aluminum alloy liquid obtained in step 1S under the conditions of a mechanical stirring speed of 115 rpm and a stirring time of 15 s to prepare an aluminum alloy semi-solid slurry at a temperatu...

Embodiment 2

[0050] The content of each component of the high-performance semi-solid die-casting aluminum alloy is expressed in weight percentage as follows: Si 13.50%, Mg 1.00%, Cu 0.50%, Ti 0.10%, Mn 1.00%, Sr 0.10%, Fe≤0.2%, impurity elements The sum is <0.15, and the rest is Al. The preparation method of the high-performance semi-solid die-casting aluminum alloy comprises the following steps:

[0051] 1S batching and smelting: According to the above composition, the raw materials are 99.9% instant silicon, 99.95% magnesium ingot, 99.99% electrolytic copper, 99.8% aluminum ingot, Al-10Ti alloy, Al-10Mn alloy, Al-10Sr alloy, Heat and smelt the prepared raw materials to obtain aluminum alloy liquid, wherein the smelting temperature is 730°C;

[0052] Preparation of 2S semi-solid slurry: After refining the aluminum alloy liquid obtained in step 1S with hexachloroethane to degas and remove slag, the aluminum alloy liquid was prepared at a temperature of Aluminum alloy semi-solid slurry at...

Embodiment 3

[0056] The content of each component of high-performance semi-solid die-casting aluminum alloy is expressed in weight percentage as follows: Si 7.50%, Mg0.20%, Cu 0.10%, Ti 0.01%, Mn 0.20%, Sr 0.01%, Fe≤0.20%, impurity elements The sum is less than 0.18, and the rest is Al. The preparation method of the high-performance semi-solid die-casting aluminum alloy comprises the following steps:

[0057] 1S batching and smelting: According to the above composition, the raw materials are 99.9% instant silicon, 99.95% magnesium ingot, 99.99% electrolytic copper, 99.8% aluminum ingot, Al-10Ti alloy, Al-10Mn alloy, Al-10Sr alloy, Heating and smelting the prepared raw materials to obtain aluminum alloy liquid, wherein the smelting temperature is 755°C;

[0058] Preparation of 2S semi-solid slurry: After refining the aluminum alloy liquid obtained in step 1S with hexachloroethane to degas and remove slag, prepare the aluminum alloy liquid at a temperature of Aluminum alloy semi-solid slur...

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Abstract

The invention relates to the technical field of aluminum alloy processing, in particular to a high-performance semi-solid die cast aluminum alloy and a preparation method of the high-performance semi-solid die cast aluminum alloy. The aluminum alloy comprises the following components of, by weight percentage, 6.00-13.50% of Si, 0.15-1.00% of Mg, 0.05-0.50% of Cu, 0.01-0.10% of Ti, 0.10-1.00% of Mn, 0.01-0.10% of Sr, not larger than 0.20% of Fe, impurity elements and the balance aluminum, wherein the sum of the impurity elements is less than 0.15, and the ratio of weight percent C 1 is equal toMg / Mn and is in the range of 0.75-1.50. According to the high-performance semi-solid aluminum alloy, on the basis of optimizing the Si, Mg and Mn main alloy elements, the Ti element is added to refine the alpha-Al crystal grains, the Sr element is added to refine the metamorphic eutectic Si phase, and the content of the elements and the impurity elements is controlled so that the elements can cooperate mutually, so that the aluminum alloy has high strength, good plasticity and excellent semi-solid state die casting process performance.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy processing, in particular to a high-performance semi-solid die-casting aluminum alloy and a preparation method thereof. Background technique [0002] Semi-solid die-casting molding technology refers to strong stirring during the solidification process of liquid metal, so that the dendrite network skeleton that is easy to form in ordinary casting is broken to form a dispersed granular structure, thereby making semi-solid metal liquid, and then It is die cast into billets or castings. In the ordinary casting process, the primary crystals grow up in the form of dendrites. When the solid phase ratio reaches about 0.2, the dendrites form a continuous network skeleton and lose macroscopic fluidity. If strong stirring is carried out during the cooling process of the liquid metal from the liquid phase to the solid phase, the dendrite network skeleton that is easy to form during ordinary casting wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/02C22C1/03B22D17/00C22F1/043
CPCB22D17/007C22C1/026C22C1/03C22C21/02C22F1/002C22F1/043
Inventor 张莹王继成黄子强王俊江景佰亨陈钦义任怀德
Owner ZHUHAI RUNXINGTAI ELECTRICAL
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