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Method for refining pure aluminum of Al-5% Ti intermediate alloy

A technology of al-5%ti and master alloy, which is applied in the field of metal material processing, can solve problems such as increasing production costs, difficulty in ensuring product stability and refinement effect, and coarse phase size

Inactive Publication Date: 2013-03-27
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ultrasonic treatment not only increases production costs, but also makes it difficult to ensure product stability and refinement in industrial production.
[0008] To solve TiAl 3 Phase size is coarse and many other problems, the present invention provides a kind of technology of Al-5%Ti master alloy refining pure aluminum, the TiAl in Al-5%Ti master alloy 3 The phase changes from lath to fine block, with more fine block TiAl 3 Serves as efficient heterogeneous nucleation cores, thereby increasing the refinement efficiency of Al-5%Ti master alloys

Method used

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  • Method for refining pure aluminum of Al-5% Ti intermediate alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add industrial pure aluminum and refining agent to the ceramic crucible, put it into a pit furnace and heat it to 760°C to melt it, and account for 0.6% of the total weight of pure aluminum, and undeformed Al-5%Ti Add the master alloy into the molten aluminum, stir, heat up, and let it stand for 60 minutes, then pour the molten aluminum into the iron mold at 760°C, demould, and water-cool to room temperature.

[0023] Saw the poured aluminum ingot 20mm above the bottom, and perform rough grinding, fine grinding, and polishing, and use an eddy current conductivity meter to test the conductivity. The calculated relative conductivity (at room temperature) of the aluminum ingot is 66.03%, the average grain size is 243.6μm, and the microhardness is 32.8HV 0.3 .

Embodiment 2

[0025] Add industrial pure aluminum and refining agent to the ceramic crucible, put it into a pit furnace and heat it to 760°C to melt it, and take 1 pass of Al-5%Ti with equal channel deformation (mold inner angle 110°) The intermediate alloy is added to the molten aluminum at 0.6% of the weight of pure aluminum. After stirring, heating, and standing for 5 minutes, the molten aluminum is poured into the iron mold at 760°C, demoulded, and cooled to room temperature.

[0026] Saw the poured aluminum ingot 20mm above the bottom, and perform rough grinding, fine grinding, and polishing, and use an eddy current conductivity meter to test the conductivity. The relative conductivity (room temperature) of the aluminum ingot is 63.78%, the average grain size is 216.3μm, and the microhardness is 36.1HV 0.3 .

Embodiment 3

[0028] Add industrial pure aluminum and refining agent to the ceramic crucible, put it into a well-type furnace and heat it to 760°C to melt it, and take 2 passes of Al-5%Ti with equal channel deformation (mold inner angle 110°) The intermediate alloy is added to the molten aluminum at 0.6% of the weight of pure aluminum. After stirring, heating, and standing for 30 minutes, the molten aluminum is poured into the iron mold at 760 ° C, demoulded, and cooled to room temperature.

[0029] Saw the poured aluminum ingot 20mm above the bottom, and perform rough grinding, fine grinding, and polishing, and use an eddy current conductivity meter to test the conductivity. The relative conductivity (room temperature) of the aluminum ingot is 62.58%, the average grain size is 178.7μm, and the microhardness is 38.9HV 0.3 .

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Abstract

The invention provides a process for refining pure aluminum of Al-5% Ti intermediate alloy. The process mainly comprises the following steps: 1), carrying out equal-channel deformation to the Al-5%Ti intermediate alloy under the room temperature; 2), putting a ceramic crucible with aluminum ingot and refining agent to a pit furnace for heating up to 760 DEG C for melting the aluminum ingot and refining agent; 3), adding the equal-channel deformed Al-5% Ti intermediate alloy, which is 0.1-1% of the weight of the pure aluminum, to the molten aluminum; 4), stirring and heating up the molten aluminum, stewing and keeping the temperature of the molten aluminum for 5-60 minutes; 5), pouring the molten aluminum to an iron mould at a temperature of 720 DEG C to 800 DEG C, de-moulding and water-cooling the molten aluminum to the room temperature. The refining process provided by the invention is adopted, TiAl3 phase of the Al-5%Ti intermediate alloy is changed to small blocks from plate strips, and used as effective heterogeneous nucleation core for improving the nucleation rate of the melt, so that grains are refined, grain size of industrial pure aluminum ingot can be reduced to lower than 200 microns, and good comprehensive physical and mechanical property is obtained.

Description

technical field [0001] The invention belongs to the field of metal material processing, and in particular relates to a method for refining pure aluminum with an Al-5%Ti master alloy. Background technique [0002] Due to its light weight, high specific strength, corrosion resistance, good electrical and thermal conductivity, and easy processing, aluminum alloys are widely used in the fields of machinery, aerospace, construction, electrical electronics, and automobiles. Especially in the application of high-tech fields, strict requirements are placed on the structure of aluminum ingots and aluminum billets in the subsequent deep processing process, and one of the keys to controlling their structure and properties is to cast the best as-cast grain structure ——Small and uniform equiaxed crystals. However, aluminum and its alloys are easy to form coarse grain structure under casting conditions. To realize its wide application, its as-cast structure must be improved. [0003] Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C1/06C22C21/00B22D27/20
Inventor 魏伟茆仁宇魏坤霞杜庆柏胡静
Owner CHANGZHOU UNIV