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A kind of preparation method of high-strength a356 alloy

A high-strength, alloy technology, applied in the field of metal material engineering, can solve problems such as increased alloy cost, unsatisfactory effect, and inability to meet the performance requirements of A356 alloy

Active Publication Date: 2021-01-12
CITIC DICASTAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Although the above method has improved the mechanical properties of the A356 alloy, the effect is still unsatisfactory, and the introduction of noble metal elements (such as La, Ce, Y, etc.) also increases the cost of the alloy to a certain extent
At present, a single strengthening method can no longer meet the performance requirements of the A356 alloy in industrial production, and the comprehensive use of various strengthening methods for composite strengthening is considered to be an effective way to develop low-cost high-performance aluminum alloys

Method used

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  • A kind of preparation method of high-strength a356 alloy

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Comparison scheme
Effect test

Embodiment 1

[0026] A method for preparing a high-strength A356 alloy, the mass percent of each component is: Si7%, Mg0.3%, Cu0.06, Ti 0.1%, Ba 0.2%, Zr 0.5%, impurity elements ≤ 0.15%, more than The amount is Al.

[0027] Its preparation method is as follows:

[0028] (1) A356 cast aluminum ingots, pure Mg ingots, Al-Ba master alloys and Al-Zr master alloys are used as raw materials, and the required mass percentages of each raw material are calculated according to the target alloy composition;

[0029] (2) Preheating the raw materials described in step (1) at 300°C;

[0030] (3) Set the heating temperature of the crucible resistance furnace to 740°C, add A356 cast aluminum ingots when the crucible temperature reaches 300°C, and add Al-Ba master alloy and Al- Zr master alloy; add C after the raw material is completely melted 2 Cl 6 Refining agent and stirring gently; when the furnace temperature reaches 740°C, remove the scum on the surface of the melt, keep it warm for 15 minutes, an...

Embodiment 2

[0034] A method for preparing a high-strength A356 alloy, the mass percent of each component is: Si 6.5%, Mg0.4%, Cu 0.06%, Ti 0.1%, Ba 0.4%, Zr 0.7%, impurity elements ≤ 0.15%, The balance is Al.

[0035] Its preparation method is as follows:

[0036] (1) A356 cast aluminum ingots, pure Mg ingots, Al-Ba master alloys and Al-Zr master alloys are used as raw materials, and the required mass percentages of each raw material are calculated according to the target alloy composition;

[0037] (2) Preheating the raw materials described in step (1) at 300°C;

[0038] (3) Set the heating temperature of the crucible resistance furnace to 750°C, add A356 cast aluminum ingots when the crucible temperature reaches 300°C, and add Al-Ba master alloy and Al- Zr master alloy; add C after the raw material is completely melted 2 Cl 6 Refining agent and stirring gently; when the furnace temperature reaches 750 °C, remove the scum on the surface of the melt, keep it warm for 20 minutes, and t...

Embodiment 3

[0042] A method for preparing a high-strength A356 alloy, the mass percent of each component is: Si 7%, Mg 0.35%, Cu 0.05%, Ti 0.08%, Ba 0.3%, Zr 0.6%, impurity elements ≤ 0.15%, The balance is Al.

[0043] Its preparation method is as follows:

[0044] (1) A356 cast aluminum ingots, pure Mg ingots, Al-Ba master alloys and Al-Zr master alloys are used as raw materials, and the required mass percentages of each raw material are calculated according to the target alloy composition;

[0045] (2) Preheating the raw materials described in step (1) at 300°C;

[0046] (3) Set the heating temperature of the crucible resistance furnace to 730°C, add A356 cast aluminum ingots when the crucible temperature reaches 350°C, and add Al-Ba master alloy and Al- Zr master alloy; add C after the raw material is completely melted 2 Cl 6 Refining agent and stirring gently; when the furnace temperature reaches 730°C, remove the scum on the surface of the melt, keep it warm for 20 minutes, and t...

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Abstract

The invention discloses a method for preparing a high-strength A356 alloy. A novel low-cost, high-strength A356 alloy is prepared by means of modification treatment, solid solution strengthening, fine-grain strengthening and second phase strengthening. (1) Improve the as-cast structure of the alloy by adding modifiers Ba and Zr; (2) Use high-pressure solidification technology to prepare high-pressure solidified A356 with finer grains and higher supersaturated solubility of Mg, Si and other elements in the matrix (3) Further enhance the strength of the high-pressure solidified A356 alloy through aging strengthening.

Description

technical field [0001] The invention relates to a preparation method of high-strength A356 alloy, which belongs to the technical field of metal material engineering. Background technique [0002] Aluminum alloy has the characteristics of high strength and hardness, good machinability and castability, excellent shock absorption and heat dissipation, strong recyclability and good corrosion resistance, and is widely used in automobiles, aviation, aerospace and electronic appliances and other fields. [0003] A356 alloy (my country's brand name is ZL101) belongs to the cast Al-Si alloy, which not only has excellent casting performance, but also can be used to cast thin-walled or complex-shaped castings, so it is widely used in automotive aluminum alloy wheels. However, due to the coarse structure and dendrite segregation of the primary α-Al phase in the as-cast A356 alloy, the acicular eutectic Si phase is easy to split the matrix, and its comprehensive mechanical properties of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/02C22C1/03C22F1/043
CPCC22C21/04C22F1/043
Inventor 付守军徐佐刘金伟王春伟孙海超刘会莹
Owner CITIC DICASTAL
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