Antimony-containing high-strength and high-toughness aluminum-silicon alloy and preparation method thereof

An aluminum-silicon alloy, high-strength and high-toughness technology, which is applied in the field of alloys, can solve the problems that the high-strength and high-toughness aluminum-silicon alloy cannot be satisfied, the influence relationship is not clear, and it is difficult to expand the application range of the antimony element aluminum-silicon alloy, so as to improve the strength and toughness , increased branching and high fluidity

Active Publication Date: 2020-08-07
GUANGXI UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the current addition of antimony element is around the trace addition of antimony element accounting for 0.1-0.4% of the mass of aluminum-silicon alloy, and the relationship between the specific ratio of antimony element and aluminum-silicon alloy on the performance of aluminum-silicon alloy is not clear, and it is difficult to determine the specific The effect of the specific addition relationship between Al-Si alloy and antimony element on improving the strength and toughness of Al-Si alloy cannot meet the industrial demand for high-strength and high-toughness Al-Si alloy
[0004] Furthermore, it is also unknown what elements to add to the Al-Si alloy can ensure the high strength and high toughness of the Al-Si alloy under the premise of avoiding the "poisoning" of the alloy (for example, both Na and Sr will offset or weaken the metamorphic effect of the Sb element, and there is an alloy " "poisoning" phenomenon), it is difficult to expand the scope of application of antimony to the modification of aluminum-silicon alloys containing multiple elements

Method used

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  • Antimony-containing high-strength and high-toughness aluminum-silicon alloy and preparation method thereof
  • Antimony-containing high-strength and high-toughness aluminum-silicon alloy and preparation method thereof
  • Antimony-containing high-strength and high-toughness aluminum-silicon alloy and preparation method thereof

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preparation example Construction

[0045] The present invention also provides a method for preparing an antimony-containing high-strength and high-toughness aluminum-silicon alloy described in the above technical solution, comprising the following steps:

[0046] (1) Provide primary aluminum-silicon alloy melt;

[0047] (2) adding an intermediate alloy to the primary aluminum-silicon alloy melt described in step (1), performing a metamorphic reaction to obtain a metamorphic alloy feed liquid; then performing refining and casting in sequence to obtain an antimony-containing high-strength and high-toughness aluminum-silicon alloy;

[0048] The master alloy is an aluminum-antimony master alloy or a mixture of an aluminum-antimony master alloy and an aluminum-zirconium master alloy.

[0049] The invention provides a primary aluminum-silicon alloy melt, preferably melting a raw material alloy containing silicon and aluminum to obtain a primary aluminum-silicon alloy melt. In the present invention, the melting tempe...

Embodiment 1

[0060] Melt 420g of Al-20Si alloy at 700°C for 20 minutes to obtain an aluminum alloy melt; heat up to 740°C, preheat 80g of Al-5Sb master alloy to 200°C, add it to the aluminum alloy melt, and stir for 2 minutes Afterwards, the metamorphic reaction was carried out at 740°C for 8 minutes, and the melt obtained after the metamorphic reaction was cooled to 720°C, left to stand for 3 minutes, and 10gC was added 2 Cl 6 , standing still for 15 minutes for refining and degassing, removing slag, and casting the melt into a mold preheated to 220°C to obtain an antimony-containing aluminum-silicon alloy containing 0.8wt% Sb.

[0061] According to the ASTM E8M-04 standard, the tensile strength and elongation of the obtained aluminum-silicon alloy were measured. It was determined that the tensile strength of the antimony-containing aluminum-silicon alloy containing 0.8 wt% Sb obtained in Example 1 was 154.12 MPa, and the elongation was 1.97%.

[0062] The antimony-containing aluminum-s...

Embodiment 2

[0064] Melt 405g of Al-20Si alloy at 700°C for 20 minutes to obtain molten aluminum alloy; heat up to 740°C, preheat 15g of Al-10Zr master alloy and 80g of Al-5Sb master alloy to 200°C, then add to the aluminum alloy In the melt, after stirring for 2 minutes, carry out a metamorphic reaction at 740°C for 15 minutes, cool the melt obtained after the metamorphic reaction to 720°C, let it stand for 3 minutes, and add 10gC 2 Cl 6 , standing for 15 minutes for refining and degassing, slag removal, and casting the melt into a preheated mold at 220°C to obtain an antimony-containing aluminum-silicon alloy containing 0.3wt.% Zr and 0.8wt.% Sb.

[0065] The tensile strength and elongation of the antimony-containing aluminum-silicon alloy containing 0.8 wt% Sb obtained in Example 2 were tested by the same test method as in Example 1. It is determined that the tensile strength of the antimony-containing aluminum-silicon alloy containing 0.3wt.% Zr and 0.8wt.% Sb obtained in Example 2 is...

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Abstract

The invention belongs to the technical field of alloy, and particularly relates to a stibium-contained high strength and high toughness aluminum-silicon alloy and a preparation method thereof. The stibium-contained high strength and high toughness aluminum-silicon alloy comprises following constituents by weight percentage: Si of 18-22%, Sb of 0.4-1.2%, and the balance of Al and unavoidable impurities. According to the stibium-contained high strength and high toughness aluminum-silicon alloy, a specific element content scope of Si, Sb and Al is confirmed, and strength and toughness of the aluminum-silicon alloy is effectively improved through synergistic cooperation of all the elements. Experiment results show that the stibium-contained high strength and high toughness aluminum-silicon alloy has tensile strength which can reach 159.22MPa, has elongation which can reach 2.81%, and has mechanical properties of being high in strength and high in toughness.

Description

technical field [0001] The invention belongs to the technical field of alloys, in particular to an antimony-containing high-strength and high-toughness aluminum-silicon alloy and a preparation method thereof. Background technique [0002] Addition of modifying elements, such as Ba, Ca, Mg, Na, Ni, P, Sb, Sr, Ti, Y, or Yb, to Al-Si alloys is an effective way to improve the shape and size of the silicon phase in Al-Si alloys. Among them, Na and Sr are the most widely used commercial modification elements, which can transform the coarse structure of eutectic Si into fibrous eutectic structure; but the effective modification time of Na is short, and it will decay after about 1 hour of heat preservation, while Sr has Severe inhalation and shrinkage tendencies, both Na and Sr have a corrosive effect on the crucible, and also increase the solubility of hydrogen in the alloy, resulting in an increase in porosity, which in turn has an adverse effect on the mechanical properties of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/02C22C1/03C22C1/06
CPCC22C1/026C22C1/03C22C1/06C22C21/02
Inventor 唐鹏韩振尧刘裔源胡治流沈育全
Owner GUANGXI UNIV
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