Al-Mg-Sc-Zr series aluminum alloy composition for selective laser melting technology and preparation method for molding part

A selective laser melting, aluminum alloy technology, applied in the direction of improving energy efficiency, additive processing, process efficiency, etc., can solve the problems of limited solid solution element content, low density, poor mechanical properties, etc., to reduce internal Holes, comprehensive performance improvement, and the effect of increasing formability

Active Publication Date: 2018-09-04
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a selective area casting process for the above-mentioned shortcomings of the limited content of solid solution elements in the traditional casting process and the shortcomings of the existing selected area laser melting technology to form Al-Mg-Sc-Zr series aluminum alloys with low density and poor mechanical properties. Al-Mg-Sc-Zr series aluminum alloy composition for laser melting technology and preparation method of molded parts thereof

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1. Composition and content of aluminum alloy composition:

[0036] Al 92.3 Mg 6 Mn 0.5 Sc 0.5 Zr 0.7

[0037] Second, the preparation steps of aluminum alloy forming parts:

[0038] (1) Master alloy melting:

[0039] After preheating the crucible to 520±5℃, place the pure aluminum in the crucible, and continue to heat up to 1100±5℃. After the pure aluminum is melted, press the Al-Zr master alloy into the pure aluminum, and stir for 30 minutes. After stirring evenly, reduce the melt temperature to 750±5°C, then add Mg, Mn and Al-Sc alloy, and stir for 30 minutes to obtain an alloy melt with uniform composition;

[0040] (2) Powder preparation:

[0041] After the alloy melt is melted uniformly, open the valve at the bottom of the crucible, the alloy melt flows out through an alumina conduit with an inner diameter of 5mm, and falls freely. The chemical pressure is 10MPa, and the powder of 15-60 microns is finally screened for use;

[0042] (3) Preparation of alum...

Embodiment 2

[0058] 1. Composition and content of aluminum alloy composition:

[0059] Al 86 Mg 10 Mn 1 Sc 2 Zr 1

[0060] Second, the preparation steps of aluminum alloy forming parts:

[0061] (1) Master alloy melting:

[0062] Same as step (1) in Example 1.

[0063] (2) Powder preparation:

[0064] With step (2) in embodiment 1.

[0065] (3) Preparation of aluminum alloy forming parts:

[0066] 1) Use CAD to establish a 3D model of the required forming parts and convert it into a divisible data format;

[0067] 2) Cut the three-dimensional model together with the support into multiple layers with a thickness of 0.04mm and import it into the SLM equipment;

[0068] 3) Spread a layer of 0.04mm metal powder on a removable substrate as described in step S2;

[0069] 4) Laser scanning step 3) The geometry of the cross section of the metal powder layer is 4 times, the laser spot during the scanning process is: 0.1mm, the laser power is: 360W, and the laser scanning rate is: 800mm / ...

Embodiment 3

[0081] 1. Composition and content of aluminum alloy composition:

[0082] Al 76 Mg 15 Mn 2 Sc 4 Zr 3

[0083] Second, the preparation steps of aluminum alloy forming parts:

[0084] (1) Master alloy melting:

[0085] Same as step (1) in Example 1.

[0086] (2) Powder preparation:

[0087] With step (2) in embodiment 1.

[0088] (3) Preparation of aluminum alloy forming parts:

[0089] 1) Use CAD to establish a 3D model of the required forming parts and convert it into a divisible data format;

[0090] 2) Cut the three-dimensional model together with the support into multiple layers with a thickness of 0.04mm and import it into the SLM equipment;

[0091] 3) Spread a layer of 0.04mm metal powder on a removable substrate as described in step S2;

[0092] 4) Laser scanning step 3) The geometry of the cross-section of the metal powder layer is 4 times. During the scanning process, the laser spot is: 0.1mm, the laser power is: 400W, and the laser scanning rate is: 800mm...

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Abstract

The invention discloses an Al-Mg-Sc-Zr series aluminum alloy composition for selective laser melting technology and a preparation method for a molding part. The composition comprises, by mass, 6-15% of Mg, 0.5-4% of Sc, 0.7-3% of Zr, 0.5-2% of Mn and the balance aluminum. An aluminum alloy molding part are prepared by smelting of master alloy, preparation of metal powder, preparation of aluminum alloy molding parts and heat treatment processes. According to the elective laser melting technology, the solubility of Mg, Sc and Zr alloy elements in aluminum matrix is greatly improved, the concentration of solid solution strengthening elements and dispersion strengthening particles in the aluminum alloy is increased, and the mechanical property of the aluminum alloy is improved. According to the aluminum alloy obtained by preparation of the selective laser melting technology, the highest density is 99.8%, the highest extension strength sigma b reaches 550 MPa, the yield strength sigma0.2 reaches 520 MPa, the plastic deformation rate of about 12 % is maintained, and the Al-Mg-Sc-Zr series aluminum alloy composition for the ctive laser melting technology and the preparation method for themolding part is applied to complicated structural parts with higher mechanical properties.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a preparation method of an Al-Mg-Sc-Zr series aluminum alloy composition for selective laser melting technology and a molding part thereof. Background technique [0002] Al-Mg series aluminum alloys are widely used in many fields such as automobile, construction and aerospace due to their light weight, high strength and good workability. With the continuous development of high technology, traditional aluminum alloy materials can no longer meet the requirements of engineering design and advanced processing technology in some high-tech fields in terms of material mechanical properties and processing performance. In order to further improve the mechanical properties and improve the processing properties of Al-Mg alloys, the application of rare earth microalloying methods has received extensive attention. [0003] The grain refinement effect of Sc on aluminum alloy is better t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/06C22C1/03B22F9/08B22F3/105B33Y70/00B33Y10/00
CPCC22C1/026C22C1/03C22C21/06B22F3/105B22F9/082B33Y10/00B33Y70/00B22F2009/0824Y02P10/25
Inventor 耿遥祥许俊华喻利花鞠洪博李洁
Owner JIANGSU UNIV OF SCI & TECH
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