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Combined treating method for modified Mg2Si/Fe-rich aluminum matrix composite texture

An aluminum-based composite material and composite processing technology, which is applied in the field of processing Mg2Si/Fe-rich aluminum-based composite materials, can solve the problems of matrix splitting, reducing Fe content in aluminum, reducing the quality of waste aluminum, etc., and achieves simple operation and low cost , The effect of simple process

Active Publication Date: 2015-11-25
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The β-Fe phase in the aluminum alloy is in the shape of thick needle flakes, which has a serious splitting effect on the matrix, thereby significantly reducing the quality of waste aluminum.
At present, there is no particularly effective process technology to remove or significantly reduce the Fe content in aluminum

Method used

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  • Combined treating method for modified Mg2Si/Fe-rich aluminum matrix composite texture
  • Combined treating method for modified Mg2Si/Fe-rich aluminum matrix composite texture
  • Combined treating method for modified Mg2Si/Fe-rich aluminum matrix composite texture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1B

[0083] Example 1B-Cr vs. 20% Mg 2 Composite modification of Si / Fe-rich aluminum matrix composite

[0084] First, the specific composition of the Fe-rich aluminum alloy is determined by ICP direct reading spectroscopy, where the mass percentage of Si is 7%, the mass percentage of Fe is 1.3%, and the rest is mainly Al. Mg in this example 2 The Si reinforcement particles are generated in-situ in the aluminum alloy by melting pure magnesium and Al-20Si master alloy with the raw materials. The components and mass percentages of the refined modifier added in this embodiment are: B: 0.2%, Cr: 0.8%.

[0085] This embodiment deteriorates Mg 2 The specific operation method of the composite treatment technology of Si / Fe-rich aluminum matrix composite structure is as follows:

[0086] (1) First, preheat a certain amount of Fe-rich aluminum alloy, pure magnesium, and Al-20Si master alloy at 300°C for 5 minutes, then increase the temperature to 720°C for 20 minutes, and stir when the raw material...

Embodiment 2B

[0091] Example 2B-Cr vs. 20% Mg 2 Composite modification of Si / Fe-rich aluminum matrix composite

[0092] The modification operation process adopted in this embodiment is basically the same as that in Example 1, except for the content of the added modification agent. The components and mass percentages of the refined modifier added in this embodiment are: B: 0.2%, Cr: 1.0%.

[0093] Picture 12 It is the Mg treated by the multi-element composite refinement modifier used in this embodiment 2 SEM photos of Si / Fe-rich aluminum matrix composites, comparison figure 2 Mg without deterioration treatment 2 For Si / Fe-rich aluminum matrix composites, it can be seen that the long needle-like β-Fe phase is completely transformed into the skeleton-like α-Fe phase. The length of Fe is almost unchanged, but the width is increased by nearly 10 times, and the aspect ratio is increased from 20.4 Reduce to 3.3. Primary Mg after deterioration 2 The Si phase has a regular polygonal shape with uniform...

Embodiment 3

[0094] Example 3B-Cr vs. 20% Mg 2 Composite modification of Si / Fe-rich aluminum matrix composite

[0095] The modification operation process adopted in this embodiment is basically the same as that in Example 1, except for the content of the added modification agent. The components and mass percentages of the refined modifier added in this embodiment are: B: 0.1%, Cr: 0.8%.

[0096] Figure 13 It is the Mg treated by the multi-element composite refinement modifier used in this embodiment 2 SEM photos of Si / Fe-rich aluminum matrix composites, comparison figure 2 Mg without deterioration treatment 2 For Si / Fe-rich aluminum matrix composites, it can be seen that the long needle-like β-Fe phases are all transformed into tiny man-like and skeletal α-Fe phases, the size is reduced, and the aspect ratio is reduced to 2.3 . Primary Mg after deterioration 2 The Si phase is a regular polygon with uniform distribution, with an average size of about 45 μm, a decrease of about 36%.

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Abstract

The invention discloses a combined treating method for modified Mg2Si / Fe-rich aluminum matrix composite texture. The combined treating method comprises the following steps that firstly, melt of a Mg2Si / Fe-rich aluminum matrix composite is prepared, and heat preservation is carried out at 700-750 DEG C; secondly, a refining modificator is put into the melt, heat preservation is continued for 10-20 min at 700-750 DEG C, and stirring is carried out, wherein the refining modificator comprises Cr and B, the adding amount of Cr accounts for, by mass, 0.8-1.5% of the Mg2Si / Fe-rich aluminum matrix composite, and the adding amount of B accounts fro, by mass, 0.2-0.4% of the Mg2Si / Fe-rich aluminum matrix composite; and thirdly, degassing, purifying and refining molding are carried out on the melt obtained in the second step. According to the combined treating method, the synchronous refining modification of the Fe-phase and the Mg2Si-phase in the Mg2Si / Fe-rich aluminum matrix composite is achieved, and the combined treating method is simple in technology, easy to operate, obvious in modification effect and free of pollution.

Description

Technical field [0001] The present invention relates to Mg 2 The processing method of Si / Fe-rich aluminum-based composite material, especially relates to a kind of modified Mg 2 The composite treatment method of Si / Fe-rich aluminum-based composite material structure. Background technique [0002] Aluminum and its alloys are light in weight, high in strength, excellent in corrosion resistance, electrical conductivity and formability. They have become one of the widely used metal materials and the second largest metal structure material after steel. With the substantial increase in the amount of aluminum used, the recycling and reuse of waste aluminum alloys is an inevitable requirement for the sustainable development of society. However, in the recovery and reuse of scrap aluminum resources, high Fe content often exists after the scrap aluminum is melted due to repeated smelting or contact with Fe parts during the scrap period. There are mainly ternary phases α-Fe and β-Fe phases...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/06C22C1/03C22C21/00
Inventor 杜军关玉芹许德英彭淳李文芳周文祥吴桃泉
Owner SOUTH CHINA UNIV OF TECH
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