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Hypoeutectic Al-Si alloy and preparation method thereof

A hypoeutectic and al-si technology, applied in the field of casting aluminum alloy, can solve the problem of high cost, achieve the effect of improving plasticity, reducing overall cost and improving strength

Inactive Publication Date: 2021-07-09
GUANGDONG INST OF MATERIALS & PROCESSING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

By adding appropriate amount of Zr and Ti elements to form nano-sized (Al,Si) 3 (Zr,Ti) phase, providing α-Al nucleation particles, refining grains, the tensile strength, yield strength and elongation of castings after T6 heat treatment reach 320-340MPa, 280-300MPa and 8-10%, respectively, which are more conventional A356 aluminum alloys are increased by about 15%, 15% and 50% respectively; however, the alloy contains a higher content of Ti, the cost is higher, and there is a risk of reaction with Si

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  • Hypoeutectic Al-Si alloy and preparation method thereof
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  • Hypoeutectic Al-Si alloy and preparation method thereof

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[0039] Embodiments of the present invention also provide a method for preparing a hypoeutectic Al-Si alloy, comprising the following steps:

[0040] S1: Al-Si alloy and pure aluminum are put into the melting furnace and melted to obtain a melt;

[0041] In detail, the step of putting Al-Si alloy and pure aluminum into the melting furnace and melting to obtain the melt specifically includes: putting the raw material composed of Al-Si alloy and 70-90% pure aluminum into the melting furnace, which is the first time Feeding; Next, after the raw materials are completely melted, add the remaining 10-30% pure aluminum, which is the second feeding. Adding pure aluminum several times can not only ensure that the aluminum material is fully melted, but also better regulate the temperature of the melt.

[0042] It should be noted that, in this step, the melt temperature of the melting furnace is adjusted to 730-760° C. after the first feeding; and the temperature of the melt is adjusted to...

Embodiment 1

[0051] This embodiment provides a hypoeutectic Al—Si alloy, the alloy composition of which is 7.0% Si, 0.45% Mg, 0.03% Sr and 0.05% Ce in terms of mass percentage.

[0052] The preparation method of the hypoeutectic Al-Si alloy mainly includes the following steps:

[0053] S1: put Al-Si and 80% industrial pure aluminum prepared in proportion into the melting furnace, and raise the temperature to 750°C; after the raw materials are completely melted, add the remaining industrial pure aluminum, and keep the melt temperature at 720°C;

[0054] S2: Press the Mg block into the melt with a Ti alloy bell jar, and stir slightly;

[0055] S3: After keeping warm for 5 minutes, press the Al-Sr-Ce composite modifier into the melt with a Ti alloy bell jar, and stir slightly;

[0056] S4: After 10 minutes of heat preservation, high-purity argon gas with a purity of 99.99% was introduced into the melt for 5 minutes; the melt was allowed to stand for 20 minutes and then the slag was removed, ...

Embodiment 2

[0058] This embodiment provides a hypoeutectic Al—Si alloy, the alloy composition of which is 7.2% Si, 0.40% Mg, 0.02% Sr and 0.06% La in terms of mass percentage.

[0059] The preparation method of the hypoeutectic Al-Si alloy mainly includes the following steps:

[0060] S1: put Al-Si and 90% industrial pure aluminum prepared in proportion into the melting furnace, and raise the temperature to 730°C; after the raw materials are completely melted, add the remaining industrial pure aluminum, and keep the melt temperature at 710°C;

[0061] S2: Press the Mg block into the melt with a Ti alloy bell jar, and stir slightly.

[0062] S3: After keeping warm for 10 minutes, press the Al-Sr-RE composite modifier into the melt with a Ti alloy bell jar, and stir slightly.

[0063] S4: After 5 minutes of heat preservation, high-purity argon gas with a purity of 99.99% was introduced into the melt for 8 minutes; the melt was allowed to stand for 15 minutes, then the slag was removed, and...

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Abstract

The invention discloses a hypoeutectic Al-Si alloy and a preparation method thereof, and relates to a cast aluminum alloy technology. The hypoeutectic Al-Si alloy comprises the following components of, in percentage by mass, 7.0%-8.0% of Si, 0.4%-0.5% of Mg, 0.02%-0.03% of Sr, 0.03%-0.06% of RE, less than 0.15% of Fe, less than 0.15% of other impurity elements, and RE is one or two of Ce and La. According to the hypoeutectic Al-Si alloy, the rare earth element is adopted, no Ti element is used, the adding amount of the rare earth element is low, the overall cost can be reduced, and the strength of the alloy can be improved by increasing the content of Mg; and the Al-Sr-RE composite modifier can be added to deeply modify the eutectic silicon, so that the eutectic silicon with smaller size and lower length-diameter ratio is obtained, and the plasticity of a casting is improved.

Description

technical field [0001] The invention relates to the technical field of casting aluminum alloys, in particular to a hypoeutectic Al-Si alloy and a preparation method thereof. Background technique [0002] Al-Si series cast aluminum alloys have the advantages of high specific strength and rigidity, good casting performance, low thermal expansion coefficient and thermal cracking tendency, and excellent corrosion resistance. They are widely used in automobiles, communications, electronics, machinery and other fields. The Si content in the hypoeutectic Al-Si alloy is low, it has good casting forming properties and plasticity, and can greatly improve the strength of castings through heat treatment strengthening, and has been successfully used in automotive structural parts, including automotive wheels and engine blocks , Shock towers, brake calipers, steering knuckles, airbag support arms, etc. With the continuous improvement of automobile lightweight requirements, the requiremen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/04C22C1/03C22C1/06C22F1/043
CPCC22C21/04C22C1/026C22C1/03C22C1/06C22F1/043
Inventor 宋东福贾义旺周楠黄正华李继林
Owner GUANGDONG INST OF MATERIALS & PROCESSING