Powder thixoforming preparation method of Al3Tip/Al-based in-situ composite material

A composite material and thixotropic forming technology, which is applied in the field of preparation and molding of metal matrix composite materials, can solve the problems of long process flow, high reaction temperature, poor tissue compactness, etc., and achieve simple process, low material cost, reinforced good effect

Inactive Publication Date: 2015-03-25
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has high reaction temperature, high energy consumption, serious burning loss of alloying elements, melt gas absorption and severe oxidation, and more importantly, the formed Al 3 Ti p Mostly in the shape of thick needles, rods or blocks, severely splitting the matrix
The powder metallurgy method is the most commonly used method for the preparation of artificially prepared particle-reinforced aluminum-based composites (AMCs) because of its uniform distribution of reinforcement particles and wide degree of freedom in composition design, which can obtain composite materials with different ratios of reinforcement particles. method, but the technical process is long, especially the encapsulation steps are complicated and the cost is high; and there are pores in the material, and the compactness of the structure is poor; it is difficult to obtain parts with complex shapes and large sizes

Method used

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  • Powder thixoforming preparation method of Al3Tip/Al-based in-situ composite material
  • Powder thixoforming preparation method of Al3Tip/Al-based in-situ composite material
  • Powder thixoforming preparation method of Al3Tip/Al-based in-situ composite material

Examples

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preparation example Construction

[0007] The invention is Al 3 Ti p / Al-based self-generated composite material powder thixomorphing preparation method, the steps are: mix pure titanium powder and aluminum alloy powder evenly by ball milling, cold press in a press to form a preform, and put the preform into a vacuum furnace. The alloy is heated in the semi-solid temperature range until the reaction is completed, and after the reaction is completed, it is taken out and placed in a preheated mold for thixotropic deformation, that is, the Al alloy is prepared. 3 Ti p / Al-based composites.

[0008] According to the above-mentioned preparation method, the mixing ball milling time of pure titanium powder and aluminum alloy powder is 0.5h-1h, the ball-material ratio is 5:1, and the rotation speed is 100r / min.

[0009] According to the above-mentioned preparation method, the pressure range for pressing the preform is 144MPa-224MPa.

[0010] According to the above-mentioned preparation method, the semi-solid temper...

Embodiment 1

[0016] This example uses Ti powder with a particle size of 0-20um and 2024Al alloy powder with a particle size of 10-20um as raw materials to prepare Al with a volume fraction of 10%. 3 Ti p Reinforced 2024Al-based autogenous composites. Through conversion, Al with a volume fraction of 10% is generated 3 For Ti, the weight ratio of Ti powder to 2024 aluminum alloy powder is 1:22. According to this ratio, the raw material powder is weighed, ball milled in a ball mill for 40 minutes (ball-to-material ratio 5:1), and then put into a press to press with a pressure of 192MPa. To form a Φ50×30mm preform, heat the preform in a vacuum furnace at 655°C for 8h, take it out and put it into a mold at a temperature of 300°C for thixotropic deformation. its organized as figure 1 , 2 shown.

Embodiment 2

[0018] Use Ti powder with a particle size of 0-20um and 2024Al alloy powder with a particle size of 10-20um as raw materials to prepare Al with a volume fraction of 10% 3 Ti p Reinforced 2024Al-based autogenous composites. Through conversion, Al with a volume fraction of 10% is generated 3 For Ti, the weight ratio of Ti powder to 2024 aluminum alloy powder is 1:22. According to this ratio, the raw material powder is weighed, ball milled in a ball mill for 40 minutes (ball-to-material ratio 5:1), and then put into a press to press with a pressure of 192MPa. To form a Φ50×30mm preform, heat the preform in a vacuum furnace at 645°C for 9 hours, take it out and put it into a mold at a temperature of 300°C for thixotropic deformation. its organized as image 3 , 4 shown.

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Abstract

The invention provides a powder thixoforming preparation method of an Al3Tip / Al-based in-situ composite material. The powder thixoforming preparation method is characterized by comprising the following steps: evenly mixing the pure titanium powder and aluminum alloy powder by virtue of ball milling, forming a preformed blank by virtue of cold pressing in a sample press, putting the preformed blank into a vacuum furnace and heating until the reaction terminates within the semi-solid state temperature range of the aluminum alloy, and after the reaction terminates, taking the preformed blank into a preheated mold for thixoforming, thereby obtaining the Al3Tip / Al-based in-situ composite material.

Description

technical field [0001] The invention relates to the preparation and molding technology of metal matrix composite materials, in particular to the preparation of aluminum trititanium particle reinforced aluminum (Al 3 Ti p / Al) based autogenous composites. Background technique [0002] Al 3 Ti p Al-based composite materials have the advantages of light weight, wear resistance, and good high-temperature performance, and have broad application prospects in the fields of aerospace and automotive lights. The melt reaction method is currently prepared (Al 3 Ti p / Al) based composites is the most commonly used method. The process is to combine Ti, TiO 2 、K 2 TiF 6 The powder or Al-Ti alloy is added into the high-temperature Al liquid, and cast after the reaction is completed. This method has high reaction temperature, high energy consumption, serious burning loss of alloying elements, melt gas absorption and severe oxidation, and more importantly, the formed Al 3 Ti p Mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/10C22C21/00
Inventor 陈体军秦亚红阎峰云李元东马颖
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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