AlSiLi phase aging strengthening type low-density aluminum alloy and preparation method thereof

A technology of aging strengthening and aluminum alloy, which is applied in the direction of additive manufacturing, energy efficiency improvement, process efficiency improvement, etc., can solve the problems that aluminum alloy strengthening and light weight cannot be combined, and achieve the effect of obvious advantages in light weight

Active Publication Date: 2021-12-03
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problem that aluminum alloy strengthening and light weight cannot be combined in the prior art, the present invention provides an AlSiLi phase aging-strengthened low-density aluminum alloy and its preparation method, the room temperature yield strength of the aluminum alloy can exceed 300MPa, the tensile strength can exceed 500MPa, the elongation rate is not less than 2%, and the density is lower than that of pure aluminum, which has the advantages of light weight and high strength, and can be used to prepare aircraft crankcases and cylinders Covers, car bodies and containers, etc.

Method used

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  • AlSiLi phase aging strengthening type low-density aluminum alloy and preparation method thereof

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Effect test

Embodiment 1

[0060] Example 1: Al-Si-Li ternary aluminum alloy and its preparation and processing

[0061] In the inventive aluminum alloy of this example, the content of alloying elements added to Al is shown in Table 1, and the preparation method is: die casting → high temperature solid solution → single-stage aging heat treatment.

[0062] The first step of die casting: According to the ratio of raw materials in Table 1, Si and Li are added in the form of Al-20Si and Al-10Li master alloys respectively. Put the prepared raw materials into the crucible and melt in the vacuum induction melting furnace. After evacuating, argon protection is introduced, the temperature is raised to 720-750°C and kept for 10-20 minutes, and commercial aluminum alloy refining agent C is added. 2 Cl 6 Refining for 5-10 minutes. The melt was then purified using a commercial rotary degassing technique and maintained at a temperature of 680-700 °C. The alloy melt is injected into the pressure chamber of the di...

Embodiment 2

[0069] Example 2: Al-Si-Li-based quaternary aluminum alloy and its preparation and processing

[0070] In the inventive aluminum alloy of this example, the content of alloying elements added to Al is shown in Table 2, and the preparation method is: casting → high temperature solid solution → extrusion → double-stage aging heat treatment.

[0071] The first step of casting: According to the ratio of raw materials in Table 2, Si and Li are added in the form of Al-10Si and Al-5Li master alloys respectively. Put the prepared raw materials into the crucible and melt in the vacuum induction melting furnace. After evacuating, argon protection is introduced, the temperature is raised to 750-770°C and kept for 10-20 minutes, and the commercial aluminum alloy refining agent CCl is added 4 Refining for 10-15 minutes. Then, the alloy melt was poured into a graphite mold and cooled to room temperature to obtain an ingot containing micron-sized AlSiLi phases.

[0072] The second step is ...

Embodiment 3

[0078] Embodiment 3: Al-Si-Li-based multi-element aluminum alloy and rolling aging thereof

[0079] In the inventive aluminum alloy of this example, the content of alloying elements added to Al is shown in Table 3, and the preparation method is: casting → high temperature solid solution → cumulative stack rolling → single-stage aging heat treatment → cryogenic rolling → double-stage Aging heat treatment.

[0080] The first step of casting: According to the ratio of raw materials in Table 3, Si and Li are added in the form of Al-10Si and Al-10Li master alloys respectively. Put the prepared raw materials into the crucible and melt in the vacuum induction melting furnace. After evacuating, put in argon protection, raise the temperature to 700-760°C and keep it warm for 10-15 minutes, then add commercial aluminum alloy refining agent C 2 Cl 6 Refining for 5-15 minutes. Then, the alloy melt was poured into a graphite mold and cooled to room temperature. Observation by scanning...

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Abstract

The invention discloses an AlSiLi phase aging strengthening type low-density aluminum alloy and a preparation method thereof, and belongs to the technical field of nonferrous metal preparation and processing. The aluminum alloy comprises the following basic components in percentage by weight: 0.01%-1.0% of Si, 0.01%-1.0% of Li and the balance of Al, and at least one of the following elements in percentage by mass: 0.01-1.0% of Mg, Ca, Sr, Ti, B, Cu, Zn, Mn, Ag, Sc, Zr, Fe, Cr and Ge can be further added; the microstructure of the aluminum alloy is characterized in that AlSiLi precipitated phases with the size smaller than 30 nm are dispersed and distributed in an aging peak state aluminum matrix, and a remarkable aging strengthening effect is achieved. The preparation method comprises the steps of die casting, high-temperature solid solution treatment and aging heat treatment, or casting, high-temperature solid solution, plastic deformation and aging heat treatment, or atomization powder preparation, 3D printing and aging heat treatment. According to the aluminum alloy, the room-temperature yield strength is 90-380 MPa, the tensile strength is 150-550 MPa, the ductility is not lower than 2%, the density is lower than that of pure aluminum, and the aluminum alloy has the advantages of light weight and high strength and can be used for preparing aircraft crankcases, cylinder covers, vehicle bodies, containers and the like.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal preparation and processing, and in particular relates to an AlSiLi phase aging-strengthened low-density aluminum alloy and a preparation method thereof. Background technique [0002] The density of pure aluminum is 2.70g / cm 3 , to meet the needs of lightweight and green. However, the strength of pure aluminum is low. In order to improve its strength, people use alloying and aging strengthening methods. Common alloying elements are Cu, Mg and Zn, and fine Al particles are formed by solution aging heat treatment. 2 Cu, MgZn 2 and Al 2 Strengthening phases such as CuMg hinder dislocation movement, and combined with plastic deformation can increase the strength of the alloy. However, the densities of Cu and Zn are 8.96 g / cm 3 and 7.14g / cm 3 , which is 2.6-3.3 times the density of Al, resulting in the contradiction that aluminum alloy strengthening and light weight cannot be achieved at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22C1/03C22C1/04B22F10/28B33Y10/00B33Y70/00C22C21/02C22F1/04C22F1/043C22C21/08C22F1/05C22F1/047
CPCC22C21/00C22C1/026C22C1/03C22C1/0416B22F10/28B33Y10/00B33Y70/00C22C21/02C22F1/002C22F1/04C22F1/043C22C21/08C22F1/05C22F1/047Y02P10/25
Inventor 石章智游明乐陈王璋
Owner UNIV OF SCI & TECH BEIJING
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