Composite metamorphic cast aluminum alloy and preparation method and application thereof

A technology of casting aluminum alloy and compound modification, which is applied in the field of non-ferrous metal casting

Active Publication Date: 2013-12-04
ANHUI JIANGHUAI AUTOMOBILE GRP CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The designer of the present invention found after checking novelties through science and technology that the rare earth modifiers commonly used at present are mainly concentrated in several light rare earth elements such as Y,

Method used

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  • Composite metamorphic cast aluminum alloy and preparation method and application thereof
  • Composite metamorphic cast aluminum alloy and preparation method and application thereof
  • Composite metamorphic cast aluminum alloy and preparation method and application thereof

Examples

Experimental program
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Embodiment 1

[0048] The composition (weight percentage) of this embodiment is: 9.0% Si, 0.3% Mg, 0.4% Mn, 0.5% Yb, 2.0% sodium salt, limiting impurity elements: Fe<0.2%, Sn<0.1% , Cu<0.1%, Pb<0.05%, the rest is Al.

[0049] The sodium salt is composed of the following weight percentages: 40% NaF; 30% NaCl; 15% KCl; 15% Na 3 AlF 6 .

[0050] Specific steps are as follows:

[0051] The test materials are industrial pure Al ingots (provided by Shanghai Yuhang Aluminum Company, purity ≥99.7%), industrial pure Mg ingots (provided by Shanxi Wenxi Yinguang Magnesium Industry Group Company, purity ≥99.8%), Al-12Si and Al-10Mn master alloy (provided by Tangshan Keyuan Nonferrous Alloy Casting Company, where the value is the mass percentage), Al-20Yb master alloy (provided by Yueyang Yuhua Metallurgical New Materials Company). The total mass ratio is in accordance with the above component ratio. Pit-type resistance furnace and graphite crucible are used for smelting alloy. When the crucible is preheate...

Embodiment 2

[0068] The composition of the present invention (weight percentage) is: 8.5% Si, 0.3% Mg, 0.4% Mn, 0.2% Yb, 1.0% sodium salt, limiting impurity elements: Fe<0.2%, Sn<0.1%, Cu<0.1%, Pb<0.05%, and the rest is Al.

[0069] The sodium salt is composed of the following weight percentages: 40% NaF; 30% NaCl; 15% KCl; 15% Na 3 AlF 6 .

[0070] Specific steps are as follows:

[0071] The alloy composition ratio designed according to Example 2 is intermediate. Pit-type resistance furnace and graphite crucible are used for smelting alloy. When the crucible is preheated to about 400℃, add industrial pure aluminum and Al-12Si master alloy in sequence, and heat up to 730℃; after all melted, add Al-10Mn master alloy and stir to make it fully dissolved, then press into the magnesium with a bell jar Block, stir for 1~2min; when the furnace temperature rises to 740℃, add Al-20Yb master alloy; after all is melted, refining with argon gas for 15min, stand for 10min; increase the temperature to 760℃,...

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Abstract

The invention provides a composite metamorphic cast aluminum alloy. The composite metamorphic cast aluminum alloy comprises, by weight, 8.0 % to 10.5 % of Si, 0.17 % to 0.3 % of Mg, 0.2 % to 0.5 % of Mn, 0.1 % to 1.0 % of Yb, 0.5 % to 3.0 % of sodium salt, less than 0.2 % of Fe, less than 0.1 % of Sn, less than 0.1 % of Cu and less than 0.05 % of Pb and the balance Al, wherein the Fe, the Sn, the Cu and the Pb are limited impurity elements. The invention further provides a preparation method and application of the composite metamorphic cast aluminum alloy. Due to metamorphism of the heavy rare earth element Yb and the alloying function, the casting-state structure of the alloy is significantly refined, strength and toughness of the alloy are improved, oxidation blending imported by the sodium salt metamorphism is reduced, and the compactness of a casting is improved.

Description

Technical field [0001] The invention relates to the technical field of non-ferrous metal casting, in particular to a composite metamorphic cast aluminum alloy and a preparation method thereof. The composite metamorphic cast aluminum alloy is mainly used for manufacturing automobile engine cylinder blocks, cylinder heads and other parts. Background technique [0002] Aluminum-silicon alloy has good casting properties and mechanical properties, and is currently the most widely used cast aluminum alloy in the industry. Among them, ZL104 (ZAlSi9Mg) belongs to a hypoeutectic cast aluminum-silicon alloy. The alloy has the following advantages: good fluidity; no hot cracking tendency; good airtightness; low linear shrinkage; the alloy has better comprehensive mechanical properties after modification and heat treatment. However, the alloy has a greater tendency to get gas during smelting, and it is easy to form pinholes after solidification, which reduces the strength and plasticity of ...

Claims

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Application Information

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IPC IPC(8): C22C21/04C22C1/06B22D27/20
Inventor 李坊平魏庆丰张宇张丽芳崔凯
Owner ANHUI JIANGHUAI AUTOMOBILE GRP CORP LTD
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