A high-strength and toughness cast aluminum-silicon alloy and its preparation method and application

A technology of casting aluminum-silicon alloy and aluminum-silicon alloy, which is applied in the field of high-strength and toughness casting aluminum-silicon alloy and its preparation, can solve the problems of unsatisfactory strength and plasticity, insufficient fracture toughness, low elongation, etc., and achieve uniform structure and composition properties, improve casting fluidity, improve plasticity and toughness

Active Publication Date: 2019-12-24
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although cast aluminum-silicon alloys have good casting fluidity and mechanical processing properties, the commonly used cast aluminum-silicon alloys still have problems of low strength, poor plasticity and insufficient fracture toughness. For example, A356 cast aluminum-silicon alloys in T6 The tensile strength in the heat treatment state is usually lower than 280MPa, the yield strength is lower than 240MPa, and the elongation is lower than 7%. The strength and plasticity cannot meet the requirements of most automotive structural parts.
[0004] Therefore, the existing cast aluminum-silicon alloy and its preparation method still need to be improved and developed.

Method used

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  • A high-strength and toughness cast aluminum-silicon alloy and its preparation method and application
  • A high-strength and toughness cast aluminum-silicon alloy and its preparation method and application
  • A high-strength and toughness cast aluminum-silicon alloy and its preparation method and application

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preparation example Construction

[0041] The preparation method of the high-strength and toughness cast aluminum-silicon alloy provided by the present invention comprises the following steps in sequence:

[0042] The first step: according to the composition and mass percentage of the high-strength cast aluminum-silicon alloy, select aluminum source, silicon source, magnesium source, titanium source, strontium source, lanthanum source and cerium source as raw materials for batching;

[0043] The aluminum source is an aluminum ingot with an aluminum content of 99.7%, the magnesium source is a magnesium ingot with a magnesium content of 99.95%, the silicon source is an AlSi20 alloy, the titanium source is an AlTi10 alloy, the strontium source is an AlSr10 alloy, the lanthanum source is an AlLa5 alloy, and the cerium source is an AlSi20 alloy. AlCe5 alloy;

[0044] Step 2: Heat and melt the aluminum source at 760-780°C, then add silicon source and magnesium source, stir and melt to form aluminum alloy liquid;

[...

Embodiment 1

[0054] The cast aluminum-silicon alloy is composed of the following mass percentages: Si 7.7%, Mg 0.42%, Fe 0.12%, Ti 0.16%, Sr 0.018%, La 0.036%, Ce 0.024%, and the rest are Al and unavoidable impurity elements, The individual content of impurity elements is less than 0.05%, and the total amount is less than 0.15%. The preparation method includes the following steps in sequence:

[0055] The first step: according to the composition and mass percentage of the cast aluminum-silicon alloy, aluminum ingots with an aluminum content of 99.7%, magnesium ingots with a magnesium content of 99.95%, AlSi20 alloys, AlTi10 alloys, AlSr10 alloys, AlLa5 alloys and AlCe5 alloys are selected as raw materials. Ingredients;

[0056] Step 2: Heat and melt the aluminum ingot at 770°C, then add magnesium ingot and AlSi20 alloy, stir and melt to form aluminum alloy liquid;

[0057] The third step: adding AlTi10 alloy, AlSr10 alloy, AlLa5 alloy and AlCe5 alloy to the aluminum alloy liquid for refin...

Embodiment 2

[0063] The cast Al-Si alloy is composed of the following mass percentages: Si 7%, Mg 0.5%, Fe 0.1%, Ti0.2%, Sr 0.01%, La 0.06%, Ce 0.04%, and the rest are Al and unavoidable impurity elements , the individual content of impurity elements is less than 0.05%, and the total amount is less than 0.15%; the preparation method includes the following steps in sequence:

[0064] The first step: according to the composition and mass percentage of the cast aluminum-silicon alloy, aluminum ingots with an aluminum content of 99.7%, magnesium ingots with a magnesium content of 99.95%, AlSi20 alloys, AlTi10 alloys, AlSr10 alloys, AlLa5 alloys and AlCe5 alloys are selected as raw materials. Ingredients;

[0065] Step 2: Heat and melt the aluminum ingot at 780°C, then add magnesium ingot and AlSi20 alloy, stir and melt to form aluminum alloy liquid;

[0066] The third step: adding AlTi10 alloy, AlSr10 alloy, AlLa5 alloy and AlCe5 alloy to the aluminum alloy liquid for refinement and modificat...

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Abstract

Provided in the present invention are a high strength and ductility casted aluminum-silicon alloy, a manufacturing method for same, and applications thereof. The aluminum-silicon alloy consists of the following components in terms of mass percent: Si 7-8%, Mg 0.4-0.5%, Fe 0.1-0.2%, Ti 0.1-0.2%, Sr 0.01-0.02%, La 0.03-0.06%, Ce 0.02-0.04%, and the remainder is Al and unavoidable elemental impurities. The manufacturing method comprises the smelting of an aluminum-silicon alloy liquid, refinement and modification, refining for gas removal and impurity removal, casting, and a solution ageing treatment. The present invention, by optimizing the content of elemental Si and Mg, refining and modifying an α-Al crystallite, a β-Fe iron-rich phase, and an eutectic Si phase, allows the α-Al dendritic crystal to be converted into fine equiaxed crystallites, allows the acicular and flaky β-Fe iron-rich phase and the eutectic Si phase to be converted into a fine granular or short rod form, and eliminates the hazards posed by the acicular and flaky β-Fe iron-rich phase and the eutectic Si phase on the strength, plasticity, and fracture toughness of the aluminum-silicon alloy. The casted aluminum-silicon alloy of the present invention is provided with high strength, great plasticity, and excellent fracture toughness and is applicable in casting various force-bearing structural parts, such as vehicular lightweight structural parts.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy and its preparation, in particular to a high-strength and toughness cast aluminum-silicon alloy and its preparation method and application. Background technique [0002] Aluminum alloy has the advantages of low density, high specific strength, corrosion resistance, easy processing and molding, and recyclability. It is widely used in transportation, electronic appliances, mechanical equipment, construction and other fields. With the development of lightweight automobiles, parts such as steering knuckles, airbag support arms, brake calipers, shock towers, suspension brackets, control arms, engine cylinder blocks and cylinder heads are in urgent need of "substituting aluminum for steel". The purpose of automobile lightweight. These parts are important structural parts in automobiles. In order to improve the safety and service life of automobiles, these parts also require high comprehensive me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/04C22C1/03C22C1/06C22F1/043
CPCC22C1/026C22C1/03C22C1/06C22C21/04C22F1/002C22F1/043
Inventor 王顺成康跃华宋东福孙小燕
Owner GUANGDONG INST OF NEW MATERIALS
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