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Rare-earth-modified Al-Si-Mg-Mn cast alloy and preparation method thereof

A technology for casting alloys and rare earth metamorphism, which is applied in the field of metal materials and metallurgy, and can solve the problems of not significantly improving the mechanical properties of alloys, coarsening of eutectic Si particles, decomposition of eutectic Si particles, and lower coarsening temperature

Active Publication Date: 2018-08-21
DARE WHEEL MFG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, studies have shown that simply further increasing the Mg content does not significantly improve the mechanical properties of the alloy, probably because increasing the Mg content leads to a decrease in the decomposition and coarsening temperature of the eutectic Si particles; too coarse

Method used

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  • Rare-earth-modified Al-Si-Mg-Mn cast alloy and preparation method thereof
  • Rare-earth-modified Al-Si-Mg-Mn cast alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039]Alloy composition and preparation method are the same as Comparative Example 1, the difference is:

[0040] Add Al-10Re (wherein Re is La-Ce mixed rare earth) master alloy to alloy melt as modification agent, carry out modification treatment, the addition amount is 0.9% of the total weight of aluminum alloy melt; Such as figure 2 As shown, it can be seen from the figure that the eutectic silicon is fully modified; the tensile strength of the casting after heat treatment is 365MPa, and the elongation is 6.2%;

Embodiment 2

[0042] Method is with embodiment 1, and difference is:

[0043] (1) The design composition is Si 6.5wt%, Mg 0.8wt%, Mn 0.45wt%, Ti 0.25wt%, Be0.02wt%, and the balance is Al; prepare aluminum ingot, aluminum-beryllium master alloy, aluminum-titanium master alloy, Magnesium ingot and 85 manganese agent are used as raw materials;

[0044] (2) The alloy melt temperature is controlled at 750°C;

[0045] (3) The addition of the refining agent is 0.2% of the total weight of the aluminum alloy melt; the Al-10La master alloy is added to the alloy melt as a modifier for modification, and the addition is 0.7% of the total weight of the aluminum alloy melt ; adding Al-5Ti-B grain refiner to the alloy melt to refine the grain, the addition amount is 0.1% of the total weight of the aluminum alloy melt;

[0046] (4) Solution treatment is to keep warm at 560°C for 13 hours, then quench and cool; aging treatment is to keep warm at 200°C for 3 hours, and then air-cool; the tensile strength of...

Embodiment 3

[0048] Method is with embodiment 1, and difference is:

[0049] (1) The alloy design composition is Si 7.5wt%, Mg 1.25wt%, Mn0.35wt%, Ti 0.2wt%, Zr0.09wt%, and the balance is Al; prepare aluminum ingots, aluminum-zirconium master alloys, and aluminum-titanium master alloys , magnesium ingot and 85 manganese agent as raw materials;

[0050] (2) The alloy melt temperature is controlled at 730°C;

[0051] (3) The addition of the refining agent is 0.8% of the total weight of the aluminum alloy melt; the Al-10La master alloy is added to the alloy melt as a modifier for modification, and the addition is 0.8% of the total weight of the aluminum alloy melt ;

[0052] (4) Solution treatment is heat preservation at 540°C for 20 hours, then quenching and cooling; aging treatment is heat preservation at 180°C for 10 hours, and then air cooling; the tensile strength of the casting is 372MPa, and the elongation is 6.1%.

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Abstract

The invention relates to a rare-earth-modified Al-Si-Mg-Mn cast alloy and a preparation method thereof, and belongs to the technical field of metal materials and metallurgy. The rare-earth-modified Al-Si-Mg-Mn cast alloy comprises the following components, by weight percentage: 6.0-8.5% of Si, 0.65-1.5% of Mg, 0.25-0.75% of Mn, 0.08-0.25% of Ti, less than or equal to 0.2% of Be, less than or equalto 0.5% of Zn, less than or equal to 0.5% of Cr, less than or equal to 0.5% of Zr, and the balance Al. The preparation method comprises the following steps that (1) raw materials are prepared; (2) analuminum ingot is heated into an aluminum melt, the other raw materials are added into the aluminum melt, and uniform stirring is carried out after the other raw materials are molten; (3) a refiningagent is added for refining treatment, and then an Al-10RE modifier is added for modification treatment; (4) slagging-off is carried out after degassing is carried out, standing is carried out at thetemperature of 700-800 DEG C, and then casting is carried out to form a casting; and (5) solid solution treatment and aging treatment are carried out on the casting. According to the method, after modification is carried out by utilizing rare earth, the problem that the modifying effect degenerates and declines due to the fact that the Mn content is increased can be solved, the precipitation strengthening effect of the high-Mg alloy is brought into full play, and the mechanical property of the alloy can be improved.

Description

technical field [0001] The invention belongs to the technical field of metal materials and metallurgy, and in particular relates to a rare earth-modified Al-Si-Mg-Mn casting alloy and a preparation method thereof. Background technique [0002] Al-Si casting alloys have good casting process performance and air tightness, and can be used in sand mold, metal mold casting and pressure casting, and are the most widely used cast aluminum alloys in the industry; they also have good mechanical properties and corrosion resistance, It can be used in various structural parts and accessories subjected to moderate loads, as well as corrosion-resistant parts. [0003] Add Mg to Al-Si binary alloy to form Al-Si-Mg alloy, Mg and Si combine to form Mg 2 Si phase can participate in the solid solution-precipitation strengthening of the alloy, so the mechanical properties of the alloy can be improved by heat treatment; for example, ZL101 and ZL101A contain 0.25-0.45wt% Mg, which has a signific...

Claims

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Application Information

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IPC IPC(8): C22C21/02C22C1/03C22C1/06C22F1/043
CPCC22C1/026C22C1/03C22C1/06C22C21/02C22F1/043
Inventor 刘玉林毕常兰何芳何国元裔国宇
Owner DARE WHEEL MFG
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