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High strength Al-Mg-Sc alloy powder, preparation method thereof, application in 3D printer and 3D printing method of high strength Al-Mg-Sc alloy powder

An al-mg-sc, alloy powder technology, applied in the directions of additive manufacturing, energy efficiency improvement, process efficiency improvement, etc., can solve the problems of low elongation, grain growth, and tensile property decline, and achieve high strength. and plasticity, improve alloy strength, inhibit recrystallization effect

Active Publication Date: 2018-08-31
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) Domestic and foreign laser 3D aluminum alloys are mainly Al-12Si and AlSi10Mg, the strengthening effect mainly depends on grain refinement, the printing strength usually does not exceed 400Mpa, and the mechanical strength is low
[0005] (2) and the elongation rate is lower than 5%, although heat treatment can increase the elongation rate to 12%, the grain growth leads to a significant decrease in tensile properties (<280MPa)
[0006] (3) At present, there are reports in the literature that laser 3D printing of 2xxx aluminum alloys and 7xxx aluminum alloys produces a large number of cracks, resulting in low performance and unable to meet practical applications.

Method used

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  • High strength Al-Mg-Sc alloy powder, preparation method thereof, application in 3D printer and 3D printing method of high strength Al-Mg-Sc alloy powder
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  • High strength Al-Mg-Sc alloy powder, preparation method thereof, application in 3D printer and 3D printing method of high strength Al-Mg-Sc alloy powder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Prepare the following components in mass percentage: Mg: 6wt%, Sc: 0.3wt%, Zr: 0.15wt%, Ce: 0.1wt%, Mn: 0.3wt%, Ti: 0.5wt%, B: 0.3wt% , and the rest are Al.

[0044] The high-strength Al-Mg-Sc alloy powder for 3D printing with the above ingredients is prepared by vacuum melting, and then using argon atomization to make powder: the melting temperature is 750 ° C, and the pressure in the melting furnace is 0.4 MPa; then using argon as the The medium atomizes the metal droplets, and the atomization pressure is 3MPa.

[0045] The particle shape of the prepared powder is spherical, and the powder with a particle size below 270 mesh is sieved for SLM printing; the powder with a particle size above 200 mesh and below 50 mesh is used for LMD printing.

[0046] In an argon atmosphere, the sieved powder was kept at 350°C for 4 hours, and the heating temperature of the substrate was increased to 200°C during printing.

[0047] The above 3D printing high-strength Al-Mg-Sc alloy p...

Embodiment 2

[0050] Prepare the following components in mass percentage: Mg: 8wt%, Sc: 0.8wt%, Zr: 0.1wt%, Ce: 0.05wt%, Mn: 0.5wt%, Ti: 0.2wt%, B: 0.8wt% , and the rest are Al.

[0051] The high-strength Al-Mg-Sc alloy powder for 3D printing with the above ingredients is prepared by vacuum melting, and then using argon atomization to make powder: the melting temperature is 750°C, and the pressure in the melting furnace is 0.5MPa; then using argon gas The metal droplet is atomized as the medium, and the atomization pressure is 4MPa.

[0052] The particle shape of the prepared powder is spherical, and the powder below 270 mesh can be sieved for SLM printing; the powder above 200 mesh and below 50 mesh can be used for LMD printing.

[0053] In an argon atmosphere, the sieved powder was kept at 350°C for 4 hours, and the heating temperature of the substrate was increased to 200°C during printing.

[0054] The above 3D printing high-strength Al-Mg-Sc alloy powder fiber laser SLM printing proc...

Embodiment 3

[0057] Prepare the following components in mass percentage: Mg: 10wt%, Sc: 0.5wt%, Zr: 0.15wt%, Ce: 0.06wt%, Mn: 1wt%, Ti: 0.3wt%, B: 1wt%, the rest for Al.

[0058] The high-strength Al-Mg-Sc alloy powder for 3D printing with the above ingredients is prepared by vacuum melting, and then using argon gas atomization to make powder: the melting temperature is 770 ° C, and the pressure in the melting furnace is 0.6 MPa; then using argon gas The metal droplet is atomized as the medium, and the atomization pressure is 5MPa.

[0059] The particle shape of the prepared powder is spherical, and the powder below 270 mesh can be sieved for SLM printing; the powder above 200 mesh and below 50 mesh can be used for LMD printing.

[0060] In an argon atmosphere, the sieved powder was kept at 350°C for 4 hours, and the heating temperature of the substrate was increased to 200°C during printing.

[0061] The above 3D printing high-strength Al-Mg-Sc alloy powder fiber laser SLM printing proc...

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Abstract

The invention discloses high strength Al-Mg-Sc alloy powder, and a preparation method, application and 3D printing method thereof. The specific combination of the alloy powder has multiple strengthening mechanisms of nanometer precipitation strengthening, fine grain strengthening, solid solution strengthening and the like, and high strength and plasticity are achieved. The rare earth high strengthAl-Mg-Sc alloy powder is subjected to 3D printing, parts are free of cracks, the compactness degree is high, the tensile strength and the elongation percentage are far higher than those of AL-12Si and AlSi10Mg alloys for traditional 3D printing, and the problems that a traditional aluminum alloy is low in 3D printing strength and poor in elongation percentage, and the stretching performance and the elongation percentage cannot be improved at the same time are solved. The tensile strength of the parts formed by printing the high strength Al-Mg-Sc alloy powder can reach 523 MPa or above, and the elongation percentage can exceed 13%.

Description

technical field [0001] The invention belongs to the technical field of special materials for additive manufacturing (commonly known as 3D printing), and specifically relates to a high-strength Al-Mg-Sc alloy powder, its preparation method, its application in 3D printing and its 3D printing method. Background technique [0002] Aluminum alloys are widely used in lightweight structural parts due to their excellent high specific strength, corrosion resistance, and machinability. In the past 100 years, aluminum alloy components have been mainly formed by traditional methods such as plasticity, casting, welding, and mechanical connection. However, with the continuous improvement of the extremely high propulsion ratio of the engine, the lightweight design of aircraft structural parts poses a serious challenge to the forming method . Laser additive manufacturing technology is becoming an effective way to solve complex components of large aircraft, especially powder bed-based selec...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F9/08C22C21/06C22C1/02B22F3/105B33Y10/00B33Y70/00B33Y80/00
CPCB22F1/0003C22C1/026C22C21/06B22F9/082B33Y10/00B33Y70/00B33Y80/00B22F10/00B22F10/25B22F10/366B22F10/34B22F10/28B22F10/64B22F10/36Y02P10/25
Inventor 李瑞迪牛朋达袁铁锤王敏卜
Owner CENT SOUTH UNIV
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