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an in situ generation of mg 2 Si Reinforced Aluminum Matrix Composites Preparation and Microstructure Optimization Method

A technology of composite materials and reinforced aluminum matrix, which is used in the field of Mg2Si/Al composite material preparation and reinforcement and aluminum alloy matrix structure optimization, which can solve the problems of general melt flow properties, split matrix materials, coarse Al-Si eutectic phase, etc. problems, to achieve the effect of easy industrialized mass production, industrialized mass production, and simple operation methods

Active Publication Date: 2020-09-04
北京科技大学广州新材料研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, it is currently limited to the coarse dendritic reinforcement Mg in the composite structure of the high-quality reinforcement. 2 Si, the shape is not round enough to split the matrix material; in addition, the Al-Si eutectic phase is coarse, and the above structural characteristics seriously reduce the performance of the composite material
In addition, regarding Mg 2 The research matrix alloy of Si / Al composite material is mostly selected as pure Al or the hypereutectic Al-Si alloy with higher hardness. Due to the general melt flow performance, the casting quality is poor; the deterioration of the composite material is mostly concentrated in Mg 2 Si phase, but not enough attention is paid to the optimization of other structures in the material, and there is little research on composite refinement and modification

Method used

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  • an in situ generation of mg <sub>2</sub> Si Reinforced Aluminum Matrix Composites Preparation and Microstructure Optimization Method
  • an in situ generation of mg <sub>2</sub> Si Reinforced Aluminum Matrix Composites Preparation and Microstructure Optimization Method
  • an in situ generation of mg <sub>2</sub> Si Reinforced Aluminum Matrix Composites Preparation and Microstructure Optimization Method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1 20% Mg 2 Preparation of Si / Al-12Si Composite Material

[0036] (1) Calculate the addition amount of each raw material (pure aluminum, pure magnesium, crystalline silicon) according to the composition design of the composite material, and preheat and dry the weighed raw materials.

[0037] (2) Put pure aluminum (Al) into a graphite crucible that has been placed in a well-type resistance furnace for heating and melting, and heat up to 800°C after it is completely melted, then add crystalline silicon (Si), and stir after it is completely melted.

[0038] (3) Lower the temperature of the obtained melt to 720°C and add pure magnesium (Mg), stir evenly after melting, and keep the temperature at 720°C.

[0039] (4) Remove the scum on the surface of the melt and add C with a mass fraction of 1%. 2 Cl 6 The refining agent is stirred and refined.

[0040] (5) After standing for 5 minutes, the slag was removed again, and then cast to form, and the composite material sa...

Embodiment 2

[0042] Example 2 Sr vs. 20% Mg 2 Modification Treatment of Si / Al-12Si Composite Material

[0043] (1) adopt and make 20%Mg with (1)-(4) smelting in embodiment 1 2 The Si / Al-12Si composite material was melted and held at 730°C.

[0044] (2) A certain amount of Al-10Sr master alloy is added to the above melt and stirred sufficiently to make it melt rapidly, wherein the amount of modifier Sr added is 0.1% of the composite material melt.

[0045] (3) Refining by passing Ar gas at 730°C for 3 minutes, followed by holding at 720°C for 5 minutes, then removing slag and casting to obtain composite material samples for observation and analysis.

[0046] Figure 4 Sr versus 20% Mg prepared for Example 2 2 Metallographic photographs of Si / Al-12Si modified composites. It can be seen from the figure that the primary Mg in the unmodified composite 2 The Si phase changes from dendrite to irregular polygon; the eutectic Si phase in the composite material changes from flake or needle to ...

Embodiment 3

[0047] Example 3 P versus 20% Mg 2 Modification Treatment of Si / Al-12Si Composite Material

[0048] (1) adopt and make 20%Mg with (1)-(4) smelting in embodiment 1 2 Si / Al-12Si composite material and heat preservation at 780 ℃.

[0049] (2) A certain amount of Cu-14P master alloy is added to the above melt and stirred sufficiently to make it melt rapidly, wherein the amount of modifier P added is 0.2% of the composite material melt.

[0050] (3) Refining by passing Ar gas at 720°C for 5 minutes, followed by holding at 720°C for 5 minutes, then removing slag and casting to obtain composite material samples for observation and analysis.

[0051] Figure 5 P versus 20% Mg prepared for Example 3 2 Metallographic photographs of Si / Al-12Si modified composites. It can be seen from the figure that the primary Mg in the unmodified composite 2 The Si phase changes from dendrite to polygon, and the average particle size decreases from 80 μm in unmodified state to below 25 μm; the ef...

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Abstract

The invention discloses a preparation and structure optimization method for in-situ generation of an Mg2Si-particle-enhanced aluminum-based composite material. The preparation and structure optimization method comprises the following steps: (1) after being completely molten, pure aluminum, crystal silicon and pure magnesium of a certain proportion are refined and subjected to still standing at 700-760 DEG C, and Mg2Si / Al composite material melt is prepared; (2) a refinement and modification agent is added at 700-800 DEG C to be sufficiently stirred, and heat preservation is conducted for 5-30min at 700-760 DEG C, wherein the refinement and modification agent is prepared from the components in percentage by mass of the composite material: 0.05-0.5% of Sr, 0.05-1% of P and 0.05-0.5% of Ti;and (3) Ar gas is introduced into the composite material melt obtained through the steps for refining for 2-10 min, and after still standing for 5-20 min, casting forming is conducted at 700-760 DEG C. Composite material enhancer in-situ generation and structure composite refinement and modification optimization are achieved synchronously, a process is simple, and the composite material shows goodstructure morphology characteristics.

Description

technical field [0001] The invention relates to a method for preparing and optimizing the structure of an in-situ particle-reinforced aluminum-based composite material, in particular to a Mg 2 Preparation of Si / Al composite material and optimization method of reinforcement and aluminum alloy matrix structure. Background technique [0002] The aluminum matrix composite material is a new material formed by adding or generating a second phase substance (reinforcing phase) through a certain preparation process with an aluminum alloy as the matrix. This type of material can have a series of excellent comprehensive properties, such as high specific strength, high specific stiffness, high elastic modulus, small thermal expansion coefficient, good high temperature performance, and good fatigue resistance. Types of aluminum matrix composites include short-fiber, whisker-reinforced, long-fiber-reinforced, and particle-reinforced. There are various methods for the preparation of alum...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/10C22C1/03C22C1/06C22C21/04
Inventor 周文祥何新波许德英
Owner 北京科技大学广州新材料研究院