Rare earth-containing aluminum alloy used for semisolid state rheoforming and preparation method of semisolid state slurry thereof

A semi-solid rheological and semi-solid slurry technology, which is applied in the field of rare earth aluminum alloys for semi-solid rheological forming, can solve the problems of low roundness of the primary phase of the semi-solid structure and unfavorable semi-solid forming, and achieve a reduction in process Effects of cost control, fine spherical particles, and reduced control accuracy

Inactive Publication Date: 2010-05-12
BEIJING UNIV OF TECH
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Problems solved by technology

Liu Zheng et al. (Liu Zheng, et al., Effect of yttr um on the microstructure of a semi-solid A356 Al alloy. Rare metals, 2008, 27: 536-540) used heavy rare earth Y to refine A356 to prepare semi-solid slurry, but the primary phases of the semi-solid structure obtained have low roundness and are a

Method used

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  • Rare earth-containing aluminum alloy used for semisolid state rheoforming and preparation method of semisolid state slurry thereof
  • Rare earth-containing aluminum alloy used for semisolid state rheoforming and preparation method of semisolid state slurry thereof

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Embodiment 1

[0020] Embodiment 1: First, 631.7 g of high-purity aluminum (purity is 99.99%) and 838.4 g of Al-12% Si master alloy are added in a graphite clay crucible, and the alloy is melted in a resistance furnace at a melting temperature of 750° C. After the metal is completely melted, press 6.4g of pure Mg (99.9% purity) into the metal melt with a bell jar, and the alloy is heated at 720°C with C 2 Cl 6 Degassing and refining. After standing for 20 minutes, raise the temperature to 750°C and add 25Al-6% Er intermediate alloy. Use a K-type thermocouple to monitor the temperature of the molten metal. Lower the temperature of the molten metal to 615°C and pour it into a stainless steel mold. The inner diameter of the mold is 50mm, and the height is 100mm. Continue to reduce the temperature of the metal slurry, and control the temperature at 595±5°C to prepare the Al-7Si-0.4Mg-0.1Er alloy semi-solid slurry. At this time, the alloy is in the semi-solid range. Take the semi-solid alloy out...

Embodiment 2

[0021] Embodiment 2: First, 581.7 g of high-purity aluminum (purity is 99.99%) and 838.4 g of Al-12% Si master alloy are added in a graphite clay crucible, and the alloy is melted in a resistance furnace at a melting temperature of 750° C. After the metal is completely melted, press 6.4g of pure Mg (99.9% purity) into the metal melt with a bell jar, and the alloy is heated at 720°C with C 2 Cl 6 Degassing and refining. After standing still for 20 minutes, the temperature was raised to 750°C and 75g of Al-6% Er master alloy was added. A K-type thermocouple is used to monitor the temperature of the molten metal. Lower the temperature of the molten metal to 615°C and pour it into a stainless steel mold with an inner diameter of 50mm and a height of 100mm. Continue to reduce the temperature of the metal slurry, and control the temperature at 595±5°C to prepare an Al-7Si-0.4Mg-0.3Er alloy semi-solid slurry. At this time, the alloy is in the semi-solid range, and the semi-solid a...

Embodiment 3

[0022] Embodiment 3: First, 531.7 g of high-purity aluminum (purity is 99.99%) and 838.4 g of Al-12% Si master alloy are added in a graphite clay crucible, and the alloy is melted in a resistance furnace at a melting temperature of 750° C. After the metal is completely melted, press 6.4g of pure Mg (99.9% purity) into the metal melt with a bell jar, and the alloy is heated at 720°C with C 2 Cl 6 Degassing and refining. After standing still for 20 minutes, raise the temperature to 750°C and add 125g Al-6% Er master alloy. A K-type thermocouple is used to monitor the temperature of the molten metal. Lower the temperature of the molten metal to 630°C and pour it into a stainless steel mold with an inner diameter of 50mm and a height of 100mm. Continue to reduce the temperature of the metal slurry, and control the temperature at 595±5°C to prepare an Al-7Si-0.4Mg-0.5Er alloy semi-solid slurry. At this time, the alloy is in the semi-solid range, and the semi-solid alloy is taken...

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Abstract

The invention belongs to the technical field of semisolid state metal forming and aims at providing a rare earth-containing aluminum alloy used for semisolid state rheoforming and a preparation method of semisolid state slurry thereof. The ingredients of the alloy include: 6.5-7.5wt. percent of Si, 0.25-0.45wt. percent of Mg, 0.1-0.8wt. percent of Er and the balance of aluminum and unavoidable impurities. Compared with the alloy without adding element Er, the aluminum alloy has finer and more uniform spherical particles of the semisolid state tissue due to the addition of rare earth element Er and the refining of primary alpha-Al phase. The characteristic that the given alloy is suitable for the semisolid state forming is mainly represented in the following aspects: 1) the primary alpha-Al phase is fine and uniform spherical non-arborescent tissue; and 2) during the semisolid state rheoforming, the control accuracy on temperature is reduced and a complicated preparation device is not needed, thus reducing technological control cost.

Description

technical field [0001] The invention relates to a rare earth aluminum alloy for semi-solid rheological forming and belongs to the technical field of semi-solid metal forming. Background technique [0002] Since Professor M.C. Flemings proposed the concept of semi-solid forming in the 1970s, semi-solid forming technology has attracted the attention of various countries due to its unique technical advantages and broad application prospects. Compared with the traditional liquid or solid forming process, semi-solid forming technology has a series of advantages: 1) Improve product quality, reduce casting defects such as pores, shrinkage porosity, and segregation; 2) Reduce thermal shock of the mold and significantly increase the life of the mold; 3 ) The solidification shrinkage is small, the dimensional accuracy of the casting is high, and near-net forming can be realized; 4) Compared with the metal solid-state forming method, the flow stress of the semi-solid metal is significa...

Claims

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Application Information

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IPC IPC(8): C22C21/02B22D21/04
Inventor 聂祚仁郑学斌苏学宽
Owner BEIJING UNIV OF TECH
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