Method for preparing in-situ Al matrix composite

An aluminum matrix composite material, in-situ technology, applied in the field of materials, can solve the problems of high residual stress cracks and holes, reduce material fatigue strength, plasticity and toughness, insufficient reliability, etc., to improve laser absorption rate, inhibit recrystallization, etc. The effect of growing, expanding the range of applications

Inactive Publication Date: 2019-11-29
SHANGHAI JIAOTONG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the prepared parts are prone to high residual stress and defects such as micron-level cracks and holes, thereby reducing the fatigue strength, plasticity and toughness of the material, resulting in low yield of parts, insufficient reliability and high cost.
Therefore, traditional commercial alloy powders cannot fully meet the requirements for the manufacture of high-performance components.

Method used

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  • Method for preparing in-situ Al matrix composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Experiments were carried out with high-purity Al, industrial pure Mg, Al-50Cu master alloy, KBF 4 and K 2 TiF 6 In situ self-generated 5wt.%TiB was formulated for the raw material 2 Reinforced Al-2.2Mg-2.2Cu composites. Put high-purity Al into the crucible to melt and heat up to 790°C, and cover it with JZF-03 high-temperature covering agent; put KBF 4 、K 2 TiF 6 Mix evenly according to the mass ratio of 1:2, dry and add to the melt; after the reaction is over, take out the reaction by-products, add Al-50Cu master alloy and industrial pure Mg in turn, and add JZJ type harmless aluminum to the melt The alloy refining agent is subjected to degassing refining, standing at 750°C for 15 minutes, and then gas atomized to make powder. The process of the gas atomization device is as follows: the solution temperature is 850°C, He is used for protection and gas atomization, the air pressure is 2.67MPa, and the nozzle diameter is 2.16mm. The morphology and microstructure of...

Embodiment 2

[0029] Experiments were carried out with high-purity Al, industrial pure Mg, Al-50Cu, Al-12Zr master alloy, KBF 4 and K 2 TiF 6 In situ self-generated 5wt.%TiB was formulated for the raw material 2 Reinforced Al-2.2Mg-2.2Cu-0.1Zr composites. Put high-purity Al into the crucible to melt and heat up to 790°C, and cover it with JZF-03 high-temperature covering agent; put KBF 4 、K 2 TiF 6 After mixing evenly according to the mass ratio of 1:2, dry it and add it to the melt; after the reaction is over, take out the reaction by-products, add Al-50Cu, Al-12Zr master alloy and industrial pure Mg in sequence, and add JZJ to the melt Type harmless aluminum alloy refining agent for degassing and refining, standing at 750°C for 15 minutes, and then gas atomizing to make powder. The gas atomization process is as follows: the solution temperature is 900°C, He is used for protection and gas atomization, the air pressure is 3.10 MPa, and the nozzle diameter is 1.5 mm. The average diame...

Embodiment 3

[0031] Experiments were carried out with high-purity Al, industrial pure Mg, Al-50Cu, Al-12Zr master alloy, KBF 4 and K 2 TiF 6 In situ self-generated 5wt.%TiB was formulated for the raw material 2 Reinforced Al-2.2Mg-2.2Cu-0.1Zr composites. Put high-purity Al into the crucible to melt and heat up to 780°C, and cover it with JZF-03 high-temperature covering agent; put KBF 4 、K 2 TiF 6After mixing evenly according to the mass ratio of 1:2, dry it and add it to the melt; after the reaction is over, take out the reaction by-products, add Al-50Cu, Al-12Zr master alloy and industrial pure Mg in sequence, and add JZJ to the melt Type harmless aluminum alloy refining agent for degassing and refining, standing at 750°C for 20 minutes, and then gas atomizing to make powder. The gas atomization process is as follows: the solution temperature is 920°C, Ar protection is used for gas atomization, the air pressure is 1.10 MPa, and the nozzle diameter is 2.16 mm. The average diameter ...

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Abstract

The invention discloses a method for preparing an in-situ Al matrix composite. The method comprises the following steps: adding a high-temperature covering agent into pure Al and carrying out smelting, so as to obtain a melt; adding KBF4 and KTiF6 into the melt, and carrying out uniform mixing for a reaction; and after a by-product is removed, sequentially adding an Al-Cu intermediate alloy, an Al-Zr intermediate alloy, an Al-Sc intermediate alloy, an Al-Mn intermediate alloy, an Al-Ti intermediate alloy and pure Mg, adding a harmless Al alloy refining agent, and sequentially carrying out degassing refining and gas atomization at 700-850 DEG C, so as to obtain in-situ synthesized TiB2 particle reinforced Al-Cu-Mg composite powder. Through the method disclosed by the invention, the Al matrix composite powder which can achieve high laser absorptivity and high particle sphericity is prepared; furthermore, the technological operation is simple and easy, the cost is low, and the efficiencyis high; and the method is suitable for mass production.

Description

technical field [0001] The invention relates to a method for preparing an in-situ aluminum-based composite material, which belongs to the field of material technology. Background technique [0002] In recent years, the rapid development of weapons manufacturing, aerospace and other high-end equipment fields has put forward more and more stringent requirements on the performance and preparation of materials: in addition to high specific stiffness and specific modulus, structural materials must also have high plasticity. and high strength. At present, large-scale aircraft and other equipment manufacturing industries are increasingly demanding large-scale, precise, and complex-structured light-weight, high-strength and tough alloys to meet their needs for high performance, high reliability, high economy, and high environmental protection. Laser additive manufacturing technology can well deal with the key technical problems in the above-mentioned high-end manufacturing fields s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/10C22C1/03C22C1/06C22C21/16C22C21/06C22C32/00
CPCC22C1/06C22C1/1036C22C21/06C22C21/16C22C32/0073C22C1/1052
Inventor 吴一陈哲廉清肖亚开王浩伟
Owner SHANGHAI JIAOTONG UNIV
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