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Nanometer refining method of Al-Si system aluminum alloy structure

An aluminum alloy, al-si technology, which is applied in the field of aluminum alloy material preparation, can solve the problems of serious inhalation tendency, coarse nucleation particles, and short refining time, and achieves improved strength and toughness, good thermal stability, and refinement. The effect of alloy structure

Active Publication Date: 2014-06-04
CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for nano-refinement of the structure of Al-Si series aluminum alloys, so as to solve the problem of coarse nucleation particles, short refinement time, and serious gas-absorbing tendency in the modification process of Al-Si series aluminum alloys. and the problem of thinning failure in the presence of Zr or Cr

Method used

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  • Nanometer refining method of Al-Si system aluminum alloy structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (a) Nanoparticle identification. Through performance and cost comparative analysis and chemical compatibility analysis, select TiC nanoparticles with high strength, good thermal stability, and moderate material cost, with an average particle size of 60nm;

[0024] (b) Pretreatment of nanoparticles. Use chemical methods to carry out metal coating treatment on selected nanoparticles, and the surface coating metal is Ni to obtain pretreated nanoparticles, see figure 1 ;

[0025] (c) Melt the ZL101 aluminum alloy, raise the temperature to 730°C, pass in Ar gas for 10 minutes, and then keep it for 10 minutes;

[0026] (d) adding the nanoparticles treated in step (b) into the aluminum alloy melt, and mechanically stirring for 3 minutes, raising the temperature to 730°C, and keeping the temperature for 20 minutes;

[0027] (e) adopting metal mold casting to obtain aluminum alloy ingots;

[0028] (f) placing the aluminum alloy ingot prepared in (e) in a heat treatment furna...

Embodiment 2

[0032] (a) Nanoparticle identification. Through performance and cost comparative analysis and chemical compatibility analysis, select TiN nanoparticles with high strength, good thermal stability, and moderate material cost, with an average particle size of about 60nm;

[0033] (b) Pretreatment of nanoparticles. Carry out metal coating treatment on the selected nanoparticles, and the surface coating metal is Al to obtain pretreated nanoparticles;

[0034] (c) Melt the aluminum alloy, heat up to 740 ° C, pass through Ar gas for 5 minutes, and then keep it for 15 minutes;

[0035] (d) adding the nanoparticles treated in step (b) into the aluminum alloy melt, and mechanically stirring for 3 minutes, raising the temperature to 740° C., and keeping the temperature for 15 minutes;

[0036] (e) Casting to obtain alloy ingots;

[0037] (f) placing the alloy ingot prepared in (e) in a heat treatment furnace, the treatment temperature is 525°C, the holding time is 6 hours, and cooled ...

Embodiment 3

[0040] (a) Nanoparticle identification. Through performance and cost comparative analysis and chemical compatibility analysis, select TiC nanoparticles with high strength, good thermal stability, and moderate material cost, with an average particle size of about 60nm;

[0041] (b) Pretreatment of nanoparticles. Carrying out metal coating treatment on the selected nanoparticles, the surface coating metal is Cu, to obtain pretreated nanoparticles;

[0042] (c) Melt the ZL101 aluminum alloy, raise the temperature to 735°C, pass in Ar gas for 8 minutes, and then keep it for 12 minutes;

[0043] (d) adding the nanoparticles treated in step (b) into the aluminum alloy melt, and mechanically stirring for 3 minutes, raising the temperature to 750° C., and keeping the temperature for 10 minutes;

[0044] (e) Casting to obtain alloy ingots;

[0045] (f) placing the alloy ingot prepared in (e) in a heat treatment furnace, the treatment temperature is 530°C, the holding time is 6 hours...

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Abstract

The invention relates to a nanometer refining method of an Al-Si system aluminum alloy structure. The method is characterized by comprising the steps that TiC or TiN or AlN nano-particles are selected for metal wrapping processing, and after the preprocessed nano-particles are dried, the nano-particles are wrapped by aluminum foil to be used; aluminum alloy is subjected to fusion, temperature is raised to 730 DEG C-740 DEG C, and standing is carried out for 10 min-15 min in a heat-preservation mode; the preprocessed nano-particles are added into an aluminum alloy fusion body, mechanical stirring is carried out for 3 min-10 min, temperature is raised to 730 DEG C-750 DEG C, and standing is carried out for 10 min-20 min in a heat-preservation mode; metal type casting is used, and an aluminum alloy ingot is obtained; and the obtained aluminum alloy ingot is placed in a heat treatment furnace for heat treatment, and finally cooling is carried out to room temperature. The nano-particles are introduced, nucleation rate is improved, crystalline grains and a silicon phase structure are refined, then the obtained alloy is subjected to heat processing, and aluminum alloy materials with small and even structures and good strength and plasticity are obtained. The obdurability of the Al-Si alloy can be obviously improved, and compared with traditional Al-Si alloy, alloy tensile strength and elongation rate can be improved by at least 15% and at least 40% respectively.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy material preparation, and relates to a method for preparing an Al-Si series aluminum alloy, in particular to a method for nanometer refinement of the structure of an Al-Si series aluminum alloy. Background technique [0002] Al-Si series aluminum alloys are widely used industrial aluminum alloys, which can be used in the fields of automobile industry, aviation industry and weaponry, etc., accounting for more than 90% of all aluminum alloys. Applying aluminum alloy to auto parts can greatly reduce the weight of the car and achieve the purpose of light weight, energy saving and emission reduction. [0003] In traditional aluminum-silicon alloys, the silicon phase exists in coarse needle-like crystals, and the mechanical properties of the alloy are low. For example, the tensile strength of the ZL101 alloy is 160-200MPa, and the elongation is 1%-4%, which largely limits its scope of use. At p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D27/20C22C1/06C22C21/04C22F1/043
Inventor 聂景江徐永东朱秀荣王军王荣陈大辉邵志文
Owner CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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