Aluminum alloy powder for additive manufacturing and preparation method and application thereof

A technology of additive manufacturing and aluminum alloy powder, which is applied in the direction of additive manufacturing and additive processing, can solve the problems that the strength and toughness cannot meet the use requirements, difficult processing, and affect the mechanical properties of formed parts, so as to improve the powder fluidity, Effect of improving wettability and improving spatial distribution

Pending Publication Date: 2021-07-09
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Applying SLM technology to form a single piece or a small batch of aluminum alloy parts can greatly improve material utilization, shorten the manufacturing cycle, and reduce manufacturing costs. However, for SLM technology, aluminum-based materials are typical difficult-to-process materials. The reflectivity is very high, which makes the laser use less aluminum, and there are often problems of pores and cracks in the printing process, which seriously affects the mechanical properties of the formed parts
At present, the strength and toughness of aluminum alloy additively manufactured parts often cannot meet the use requirements of some key components.

Method used

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  • Aluminum alloy powder for additive manufacturing and preparation method and application thereof
  • Aluminum alloy powder for additive manufacturing and preparation method and application thereof
  • Aluminum alloy powder for additive manufacturing and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0031] Such as figure 1 Shown, a kind of preparation method of aluminum alloy powder for additive manufacturing comprises the following steps:

[0032] S1, compounding aluminum alloy powder, graphene powder and zirconia powder to obtain a composite material;

[0033] Specifically, the aluminum alloy powder, the graphene powder and the zirconia powder are compounded by stirring with a homogenizer.

[0034] The mass ratio of aluminum alloy powder, graphene powder and zirconia powder is 98.2%-99.4%: 0.3%-0.9%: 0.3%-0.9%; during the composite process, the aluminum alloy powder, graphene powder Alcohol is added to the mixture of body and zirconia powder and stirred evenly; the speed of the homogenizer is adjusted to 1300-1800r / min, and the stirring time is 1-3min. Specifically, alcohol can infiltrate the composite material during the mixing process, and the use of alcohol can make the graphene powder, zirconia powder and aluminum alloy powder more uniformly dispersed, and can red...

Embodiment 1

[0043] (1) Weigh 994g of AlSi10Mg aluminum alloy powder, 3g of graphene powder and 3g of zirconia powder;

[0044] (2) Put the AlSi10Mg aluminum alloy powder, graphene powder and zirconia powder into the homogenizer, add an appropriate amount of alcohol, and then set the homogenizer speed to 1500r / s and the stirring time to 1min. Stir to obtain a mixed slurry;

[0045] (3) Dry the mixed slurry in a dryer for 3H, and set the drying temperature to 75°C; then dry the powder after drying in the dryer for 12H in a vacuum, and set the drying temperature to 110°C;

[0046] (4) The obtained composite powder is printed into shape by using laser selective melting (SLM) technology.

[0047] The microstructure of the formed part is as Figure 4 As shown, the two-phase nano-reinforced phase space of the formed material is evenly distributed. The strength test of the above-mentioned material shows that the tensile strength reaches 483Mpa, the yield strength reaches 330Mpa, and the elongat...

Embodiment 2

[0049] (1) Weigh 988g AlSi10Mg aluminum alloy powder, 6g graphene powder and 6g zirconia powder;

[0050] (2) Put the AlSi10Mg aluminum alloy powder, graphene powder and zirconia powder into the homogenizer, add an appropriate amount of alcohol, and then set the homogenizer speed to 1500r / s and the stirring time to 1min. Stir to obtain a mixed slurry;

[0051] (3) Dry the mixed slurry in a dryer for 3H, and set the drying temperature to 75°C; then dry the powder after drying in the dryer for 12H in a vacuum, and set the drying temperature to 110°C;

[0052] (4) The obtained composite powder is printed into shape by using laser selective melting (SLM) technology.

[0053] A strength test was carried out on the material obtained above, wherein the tensile strength reached 532Mpa, the yield strength reached 356Mpa, and the elongation was 7.6%. The tensile strength of the material in Example 2 was also improved.

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Abstract

The invention discloses aluminum alloy powder for additive manufacturing and a preparation method and application of the aluminum alloy powder. A small amount of graphene powder, zirconium oxide powder and aluminum alloy powder are mixed, agglomeration of graphene can be prevented by mixing the zirconium oxide powder, the graphene can be subjected to interface reaction on a matrix to generate carbide, the carbide is uniformly dispersed in grain boundaries and grains to generate a pinning effect; the dislocation density is increased through Orowan strength, grains are refined through heterogeneous nucleation, and transfer of more loads from a matrix to graphene is promoted, so that a strengthening effect is achieved, spatial distribution of a double-phase reinforced phase is improved, interface bonding strength is improved, wettability of the reinforced phase and the matrix is improved, powder fluidity is improved, and the quality of the composite powder is improved; and meanwhile, by combining the high-temperature-resistant, wear-resistant and corrosion-resistant reinforcing phases of the graphene and the zirconium oxide powder, about 5% of volume expansion can be generated during conversion from a t phase (tetragonal phase) to an m phase (monoclinic phase), crack propagation in a matrix is hindered, and phase toughening is generated.

Description

technical field [0001] The invention belongs to the field of additively manufactured metal-based nanocomposite materials, and in particular relates to an aluminum alloy powder for additively manufactured and its preparation method and application. Background technique [0002] Additive manufacturing technology, also known as 3D printing technology, is relative to traditional machining and other "subtractive manufacturing" technologies. It is based on the principle of stacking, by accumulating two-dimensional sections point by point to create a three-dimensional solid. This technology can realize the direct preparation of three-dimensional digital models to physical parts, making the parts lighter in structure and more complex in performance. Compared with traditional manufacturing technology, additive manufacturing technology has the advantages of no mold, high flexibility, short cycle, and not limited by part structure and material. Additive manufacturing technology is ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F10/28B33Y70/10
CPCB22F1/0003B33Y70/10
Inventor 陈祯张树哲姚森卢秉恒魏培邹亚桐雷云佩
Owner XI AN JIAOTONG UNIV
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