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A kind of preparation method of high-strength and high-plasticity Aln/az91d magnesium-based composite material

A composite material and high plasticity technology, which is applied in the field of preparation of high-strength and high-plasticity AlN/AZ91D magnesium-based composite materials, can solve the problems of flammability, poor stability, and difficult control of the reaction process of magnesium alloys, and achieve favorable strength and plasticity , the effect of improving mechanical properties and reducing grain size

Active Publication Date: 2017-04-19
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

However, due to the shortcomings of magnesium alloys such as flammability and oxidation, the current technology of in-situ strengthening magnesium alloys is still in the laboratory research stage.
The mechanical properties of the composite material are determined by the matrix, the reinforcing phase and the interface properties between the two. In the magnesium-based composite material, due to the high activity of magnesium, if the method of external reinforcement particles is used, on the one hand, the strengthening phase is easy to Contaminated, and impurities are brought into the alloy melt; on the other hand, some reinforced phases react with the magnesium matrix to form harmful phases, which affect the improvement of the performance of magnesium alloys.
Moreover, a series of problems such as uneven distribution and poor stability of the strengthening phase have also resulted in no corresponding reports on the tensile properties of in-situ magnesium-based composites prepared by this technology in various domestic and foreign literatures. In terms of microstructure analysis and hardness performance testing, and the performance is even lower than that of the base alloy, so it cannot be used in industrial production at all.
[0003] Problems of low strength and poor plasticity of current magnesium alloy and magnesium-based composite materials
The low strength and plasticity have always restricted the development and application of magnesium alloys, especially for the cast magnesium alloys of the AZ series, so far the industry has not succeeded in finding an ideal grain refiner to improve its mechanical properties; and Magnesium-based composites have problems such as oxide inclusions, uneven distribution of particle-reinforced phases, difficult control of the reaction process, many material casting defects, serious pollution, and high manufacturing costs during the preparation process, which have seriously affected the development and production of magnesium-based composites. application

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  • A kind of preparation method of high-strength and high-plasticity Aln/az91d magnesium-based composite material
  • A kind of preparation method of high-strength and high-plasticity Aln/az91d magnesium-based composite material
  • A kind of preparation method of high-strength and high-plasticity Aln/az91d magnesium-based composite material

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Experimental program
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Effect test

Embodiment 1

[0026] Embodiment 1: Adopting AZ91D alloy as matrix alloy

[0027] Step 1. Use in-situ magnesium-based composite material preparation equipment in a resistance furnace to prepare composite materials: put 1.5Kg of matrix alloy AZ91D into a vacuum chamber, and evacuate to 0.01Ma. When the temperature in the reaction chamber rises to about 200°C , stop vacuuming, turn on the Ar gas switch, and pass in Ar gas for protection to prevent the melt from burning. The flow rate of Ar gas is 100-150ml / min. Nitrogen is fed into the melt, the nitrogen flow rate is 300-500ml / min, the air pressure is 0.2-0.4MPa, the aeration time is 1-2h, and the melt is stirred periodically (20min) during the aeration process.

[0028] 3. After the aeration, the preparation device was taken out from the resistance furnace, and cooled to room temperature in air under the protection of Ar gas (flow rate 150ml / min).

[0029] 4. Remelt the cooled alloy ingot in a mixed atmosphere of carbon dioxide, sulfur hexaf...

Embodiment 2

[0031] Embodiment 2: adopting AZ91D alloy as matrix alloy

[0032] Step 1. Use in-situ magnesium-based composite material preparation equipment in a resistance furnace to prepare composite materials: put 1.5Kg of matrix alloy AZ91D into a vacuum chamber, and evacuate to 0.01Ma. When the temperature in the reaction chamber rises to 250-300°C , stop vacuuming, turn on the Ar gas switch, and pass in Ar gas for protection to prevent the melt from burning. The flow rate of Ar gas is 200ml / min. Nitrogen is fed into the body, the nitrogen flow rate is 300-500ml / min, the air pressure is 0.2-0.4MPa, the aeration time is 1-2h, and the melt is stirred periodically (40min) during the aeration process.

[0033] 3. After the aeration, the preparation device was taken out from the resistance furnace, and cooled to room temperature in air under the protection of Ar gas (flow rate 100ml / min).

[0034] 4. Remelt the cooled alloy ingot in a mixed atmosphere of carbon dioxide, sulfur hexafluorid...

Embodiment 3

[0035] Embodiment 3: adopting AZ91D alloy as matrix alloy

[0036]Step 1. Use in-situ magnesium-based composite material preparation equipment in a resistance furnace to prepare composite materials: put 1.5Kg of matrix alloy AZ91D into a vacuum chamber, and evacuate to 0.01Ma. When the temperature in the reaction chamber rises to 250-300°C , stop vacuuming, turn on the Ar gas switch, and pass in Ar gas for protection to prevent the melt from burning. The flow rate of Ar gas is 150ml / min. Nitrogen is fed into the body, the nitrogen flow rate is 300-500ml / min, the air pressure is 0.2-0.4MPa, the aeration time is 2-3h, and the melt is stirred periodically (30min) during the aeration process.

[0037] 3. After the aeration, the preparation device was taken out from the resistance furnace, and cooled to room temperature in air under the protection of Ar gas (flow rate 150ml / min).

[0038] 4. Remelt the cooled alloy ingot in a mixed atmosphere of carbon dioxide, sulfur hexafluoride...

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Abstract

The invention relates to a preparation method of a high-strength and high-plasticity AlN / AZ91D magnesium-based composite material, which adopts the method of vacuum smelting and argon protection, the reaction gas is nitrogen, and the matrix alloy adopts the most widely used AZ91D magnesium alloy in industry, so as to benefit the industry Production. In the preparation, the in-situ magnesium-based composite material preparation device of the patent application 201510670943.X is used. The entire smelting and preparation process is carried out in a vacuum-sealed environment, which is green and environmentally friendly without pollution. The reaction gas used is nitrogen, and the cost is low. No danger. Since the entire smelting and material preparation are carried out in a closed container, there is no oxide inclusion due to magnesium alloy combustion in the entire preparation process, and no SF6 gas protection and slag removal process is required. The process is simple and reliable. Moreover, the reaction gas is dry nitrogen, and the cost is low.

Description

technical field [0001] The invention belongs to the preparation method of AlN / AZ91D magnesium-based composite material, relates to a preparation method of high-strength and high-plasticity AlN / AZ91D magnesium-based composite material, especially relates to the use of in-situ generation of strengthening particles to improve AZ91D, which is the most widely used industrially. The properties of a wide range of magnesium alloys have prepared AlN / AZ91D magnesium matrix composites with excellent properties. Background technique [0002] The application of in-situ strengthening technology in aluminum alloy is relatively mature, and some industrial production has already been carried out. However, due to the shortcomings of magnesium alloys such as flammability and oxidation, the current technology of in-situ strengthening magnesium alloys is still in the laboratory research stage. The mechanical properties of the composite material are determined by the matrix, the reinforcing phas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/10C22C23/00
CPCC22C1/1036C22C23/00C22C1/1063
Inventor 杨长林张斌吕贺宾宋祺姣刘峰
Owner NORTHWESTERN POLYTECHNICAL UNIV