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High Fe content Al-Mg2Si alloy prepared by laser selective melting and preparation method

A technology of laser selective melting and alloying, which is applied in the direction of improving process efficiency, additive manufacturing, and improving energy efficiency. It can solve problems such as high cost and difficulty in promotion, and achieve the effects of eliminating harmful effects, good strengthening effects, and excellent mechanical properties.

Inactive Publication Date: 2020-02-07
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The most basic methods to control the content of iron in industrial production are dilution method and gravity sedimentation method. The methods to reduce the harm of Fe-rich phase in aluminum alloy mainly include adding neutralizing elements, rapid solidification and melt superheating method, but these methods require high cost. , new technology support, it is difficult to promote in practical application

Method used

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  • High Fe content Al-Mg2Si alloy prepared by laser selective melting and preparation method
  • High Fe content Al-Mg2Si alloy prepared by laser selective melting and preparation method
  • High Fe content Al-Mg2Si alloy prepared by laser selective melting and preparation method

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Experimental program
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Effect test

Embodiment 1

[0067] 1. Composition and content of aluminum alloy composition

[0068] A1-89.7% Mg-5.5% Si-2.2% Mn-0.6% Fe-2%

[0069] 2. Preparation steps of aluminum alloy forming parts

[0070] 1) Provide the sieved Al-Mg Si gas atomized spherical powder;

[0071] 2) Use slicing software to slice the CAD model of the part to obtain the two-dimensional data of each layer, and then transmit the data to the SLM device;

[0072] 3) Spread 0.05mm of Al-Mg provided in step 1) on a detachable aluminum alloy substrate preheated to 100°C 2 Si alloy powder;

[0073] 4) Laser scanning step 3) The geometric shape of the cross-section of the metal powder layer. During the scanning process, the laser spot is 0.1mm, the laser power is 310W, and the laser scanning rate is 800mm / s to make it melt and solidify. Under the condition of Ar atmosphere;

[0074] 5) The piston of the forming cylinder is lowered by one powder layer thickness, the scraper runs to spread the second layer of powder evenly, and...

Embodiment 2

[0079] 1. Composition and content of aluminum alloy composition

[0080] A1-89.7% Mg-5.5% Si-2.2% Mn-0.6% Fe-2%

[0081] 2. Preparation steps of aluminum alloy forming parts

[0082] 1) Provide the sieved Al-Mg Si gas atomized spherical powder;

[0083] 2) Use slicing software to slice the CAD model of the part to obtain the two-dimensional data of each layer, and then transmit the data to the SLM device;

[0084] 3) Spread 0.05mm of the Al-Mg2Si alloy powder provided in step 1) on a detachable aluminum alloy substrate preheated to 100°C;

[0085] 4) Laser scanning step 3) The geometric shape of the cross-section of the metal powder layer. During the scanning process, the laser spot is 0.1mm, the laser power is 310W, and the laser scanning rate is 800mm / s to make it melt and solidify. Under the condition of Ar atmosphere;

[0086] 5) The piston of the forming cylinder is lowered by one powder layer thickness, the scraper runs to spread the second layer of powder evenly, an...

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Abstract

The invention discloses a high Fe content Al-Mg2Si alloy prepared by laser selective melting and a preparation method. The Al-Mg2Si alloy is formed by Al-Mg2Si alloy raw material powder through a laser selective melting technology, the Al-Mg2Si alloy is composed of the following components by mass percentage: 5-5.5% of Mg, 2-2.2% of Si, 0.4-0.6% of Mn, 1-3% of Fe and the balance of aluminum, and the total mass percentage is 100%. According to the invention, the high Fe content Al-Mg2Si alloy is prepared by the laser selective melting technology skillfully, through using the characteristic thatthe cooling rate in the laser selective melting technology can reach 105-108 k / s, after alloy raw material powder is melted, the alloy is in non-equilibrium solidification at an extremely fast cooling rate, alloy elements are uniformly distributed, all elements have no segregation, and (Al+Mg2Si) ultrafine eutectic structures are uniformly formed, meanwhile, the formation of coarse Fe-rich intermetallic compounds is inhibited, fine Fe-rich intermetallic compounds are uniformly dispersed, and the high Fe content Al-Mg2Si alloy with excellent mechanical properties is obtained.

Description

technical field [0001] The invention belongs to the technical field of new material preparation, in particular to Al-Mg with high Fe content prepared by laser selective melting 2 Si alloy and its preparation method. Background technique [0002] Mg 2 Si has good physical and mechanical properties and is widely used as a reinforcing phase to prepare Mg 2 Si reinforced aluminum matrix composites (Al-Mg 2 Si) or Mg 2 Si reinforced magnesium matrix composites (Mg-Mg 2 Si), they are attractive candidate materials in the fields of automobile, aerospace, biomedicine and so on. Due to Mg 2 The Si phase has good compatibility with the aluminum matrix, the interface is clean and firm, and it is dispersed on the matrix, and it has far better machinability and formability than ceramic particle-reinforced aluminum composites. Therefore, Mg 2 Si intermetallic compounds are very suitable as the reinforcement phase of aluminum-based alloy materials, and Al-Mg 2 The preparation metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/08C22C1/04B22F3/105C22F1/047
CPCC22C21/08C22C1/0416C22F1/047B22F10/00B22F10/36B22F10/32B22F10/366B22F10/28B22F10/64Y02P10/25
Inventor 杨海林张莹莹汪建英冀守勋闫锋周科朝
Owner CENT SOUTH UNIV
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