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Special high strength 7-series aluminum-based composite material for 3D printing and preparation method thereof

An aluminum-based composite, 3D printing technology, applied in the direction of additive processing, energy efficiency improvement, process efficiency improvement, etc., can solve problems such as limiting application, reducing mechanical properties, and 7 series aluminum alloys are prone to cracks, so as to improve mechanical properties. Effects of performance, suppression expansion, and mechanical performance improvement

Active Publication Date: 2020-10-30
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high residual stress during laser processing, the 7-series aluminum alloy prepared by SLM is extremely prone to cracks, which greatly reduces its mechanical properties and severely limits its application in modern industries.

Method used

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  • Special high strength 7-series aluminum-based composite material for 3D printing and preparation method thereof
  • Special high strength 7-series aluminum-based composite material for 3D printing and preparation method thereof
  • Special high strength 7-series aluminum-based composite material for 3D printing and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0027] A 7-series aluminum-based composite material without cracks, comprising 7-series aluminum alloy powder, copper-based alloy powder, and erbium oxide powder, wherein the mass fraction of erbium oxide is 0.8%, the mass fraction of copper-based shape memory alloy is 3%, and the remaining The amount is 7 series aluminum alloy powder. The mass fraction of each element in the above 7 series aluminum alloy powder is Si: 3%, Fe: 0.6%, Cu: 1%, Mn: 0.3%, Mg: 2.8%, Cr: 0.3%, Zn: 6.4%, Ti: 0.3 %, Zr: 1.1%, Sc: 0.6%, and the balance is Al.

[0028] The preparation method of the above-mentioned 7-series aluminum alloy without cracks comprises the following steps:

[0029] S1. Gas atomization treatment at 700°C and 7MPa for 1h to prepare 7-series aluminum alloy powder, and gas atomization treatment at 1100°C and 8MPa for 1h to prepare copper-based shape memory alloy powder. Afterwards, the erbium oxide is dispersed in the aqueous solution, first the oxide suspension system is ultraso...

Embodiment 2

[0034] A 7-series aluminum-based composite material without cracks, comprising 7-series aluminum alloy powder, copper-based alloy powder, and erbium oxide powder, wherein the mass fraction of erbium oxide is 0.8%, the mass fraction of copper-based shape memory alloy is 3%, and the remaining The amount is 7 series aluminum alloy powder. The mass fraction of each element in the above 7 series aluminum alloy powder is Si: 3%, Fe: 0.6%, Cu: 1%, Mn: 0.3%, Mg: 2.8%, Cr: 0.3%, Zn: 6.4%, Ti: 0.3 %, Zr: 1.1%, Sc: 0.6%, and the balance is Al.

[0035] The preparation method of the above-mentioned 7-series aluminum alloy without cracks comprises the following steps:

[0036]S1. Gas atomization treatment at 700°C and 7MPa for 1h to prepare 7-series aluminum alloy powder, and gas atomization treatment at 1100°C and 8MPa for 1h to prepare copper-based shape memory alloy powder. Afterwards, erbium oxide is dispersed in the aqueous solution, the oxide suspension system is ultrasonically osc...

Embodiment 3

[0041] A 7-series aluminum-based composite material without cracks, comprising 7-series aluminum alloy powder, copper-based alloy powder, and erbium oxide powder, wherein the mass fraction of erbium oxide is 0.8%, and the mass fraction of 7-series aluminum alloy powder is 99.2%. The mass fraction of each element in the above 7 series aluminum alloy powder is Si: 3%, Fe: 0.6%, Cu: 1%, Mn: 0.3%, Mg: 2.8%, Cr: 0.3%, Zn: 6.4%, Ti: 0.3 %, Zr: 1.1%, Sc: 0.6%, and the balance is Al.

[0042] The preparation method of the above-mentioned 7-series aluminum alloy without cracks comprises the following steps:

[0043] S1. The 7-series aluminum alloy powder was prepared by gas atomization treatment at 700°C and 7MPa for 1 hour. Afterwards, erbium oxide is dispersed in the aqueous solution, the oxide suspension system is ultrasonically oscillated for 0.5 h, and a surfactant alkylsulfonate is added to the nano oxide suspension system under high-speed stirring. Then magnetically stir at ro...

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Abstract

The invention discloses a special high strength 7-series aluminum-based composite material for 3D printing and a preparation method thereof. According to the preparation method of the special high strength 7-series aluminum-based composite material for 3D printing comprises, the special high strength 7-series aluminum-based composite material comprises 7-series aluminum alloy powder, copper-basedshape memory alloy powder and erbium oxide powder. The preparation method comprises the following steps of packaging the 7-series aluminum alloy powder, the copper-based shape memory alloy powder andthe erbium oxide powder in powder mixing equipment to be uniformly mixed; and drying and screening the mixed powder to obtain the 7-series aluminum-based composite powder for laser 3D printing of a powder bed, wherein the mixed powder comprises the following powder in percent by mass: 0.1-1% of erbium oxide powder, 0.1-3% of copper-based shape memory alloy powder and the balance of 7-series aluminum alloy powder. By adding the copper-based shape memory alloy and the erbium oxide, cracks of the 7-series aluminum alloy prepared by an SLM method are eliminated and the mechanical properties of the7-series aluminum alloy are improved.

Description

technical field [0001] The invention belongs to the technical field of metal material forming and manufacturing, and in particular relates to a high-strength 7-series aluminum-based composite material for 3D printing and a preparation method thereof. Background technique [0002] Aluminum alloys have high specific strength, electrical conductivity, thermal conductivity, and good corrosion resistance, and are widely used in industrial fields such as automobiles, transportation, aviation, and parts. However, due to the poor casting and welding properties of aluminum alloy, it is difficult to prepare by traditional processing methods. At the same time, traditional processing and manufacturing methods are difficult to meet the needs of preparing parts with complex shapes. 7-series aluminum alloy is a kind of high-strength aluminum alloy, which belongs to superhard aluminum alloy. Its mechanical properties and processing performance are extremely superior, and it plays a pivotal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B33Y10/00B33Y70/10C22C1/05C22C21/10
CPCB33Y10/00B33Y70/10C22C1/05C22C21/10Y02P10/25
Inventor 李瑞迪李澜波袁铁锤冉俊铭黄伟超
Owner CENT SOUTH UNIV
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