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a spoiled mg 2 Composite Treatment Method for Microstructure of Si/Fe-Rich Aluminum Matrix Composites

An aluminum-based composite material and a composite treatment technology, which is applied in the treatment field of Mg2Si/Fe-rich aluminum-based composite materials, can solve the problems of reducing the quality of scrap aluminum, reducing Fe content in aluminum, and matrix splitting, etc., and achieves low cost and easy operation. , the effect of obvious metamorphism

Active Publication Date: 2017-03-22
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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  • a spoiled mg <sub>2</sub> Composite Treatment Method for Microstructure of Si/Fe-Rich Aluminum Matrix Composites
  • a spoiled mg <sub>2</sub> Composite Treatment Method for Microstructure of Si/Fe-Rich Aluminum Matrix Composites
  • a spoiled mg <sub>2</sub> Composite Treatment Method for Microstructure of Si/Fe-Rich Aluminum Matrix Composites

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0084] First, the specific composition of the Fe-rich aluminum alloy was determined by ICP direct-reading spectroscopy, in which the mass percentage of Si was 7%, the mass percentage of Fe was 1.3%, and the rest was mainly Al. Mg in this example 2 Si-reinforced particles are produced in situ inside the aluminum alloy by melting pure magnesium and Al-20Si master alloy together 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 modifies 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 raise the temperature to 720°C and keep it for 20 minutes. After t...

Embodiment 2

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

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

[0093] Figure 12 It is the Mg after the treatment of the multi-element composite refinement modificator adopted in the present embodiment 2 SEM photos of Si / Fe-rich aluminum matrix composites, comparison figure 2 Unmodified Mg 2 Si / Fe-rich aluminum matrix composite material, it can be seen that all the long needle-like β-Fe phases have transformed into skeletal α-Fe phases, the length of Fe has hardly changed, but the width has increased by nearly 10 times, and the aspect ratio has changed from 20.4 Reduced to 3.3. Primary Mg after modification 2 The Si phase is regular polygonal, evenly distr...

Embodiment 3

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

[0095] The modification operation process that present embodiment adopts is basically the same as embodiment 1, and difference is the content of the modification agent that adds. 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 after the treatment of the multi-element composite refinement modificator adopted in the present embodiment 2 SEM photos of Si / Fe-rich aluminum matrix composites, comparison figure 2 Unmodified Mg 2 Si / Fe-rich aluminum matrix composite material, it can be seen that the long needle-like β-Fe phases are all transformed into fine Chinese-shaped and bone-like α-Fe phases, the size is reduced, and the aspect ratio is reduced to 2.3 . Primary Mg after modification 2 The Si phase is regular polygonal, evenly distributed, and the average size is about 45 μm, which is a...

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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 Process for processing Si / Fe-rich aluminum matrix composites, in particular involving a metamorphic Mg 2 Composite processing method of Si / Fe-rich aluminum matrix composite structure. Background technique [0002] Aluminum and its alloys are light in weight, high in strength, excellent in corrosion resistance, good in electrical conductivity and formability, and have become one of the most widely used metal materials and the second largest metal structural material after steel. With the substantial increase in the use of aluminum, the recycling and reuse of waste aluminum alloys is an inevitable requirement for the sustainable development of society. However, in the recycling and reuse of waste aluminum resources, due to repeated smelting or contact with Fe parts during the waste period, there is often a high Fe content after the waste aluminum is melted. The ternary phases α-Fe and β-Fe phases mainly exist in a...

Claims

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Application Information

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Patent Type & Authority Patents(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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