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Grain refinement and modification master alloy for aluminum and aluminum alloy and method for preparing same

An intermediate alloy and grain refinement technology, which is applied in the field of aluminum alloy melting and casting, to achieve uniform distribution, good combination and excellent effect

Active Publication Date: 2009-12-02
广州工业投资控股集团有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the existing disclosed inventions all completely separate grain refinement and deterioration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Prepare 1Kg complex agent master alloy, its component weight percent is: Ti 3.0%, B1.0%, Sr0.5%, RE0.5%, A195.0%, preparation process is as follows:

[0017] 1) Ingredients: Potassium Fluotitanate (K 2 TiF 6 ) 150.4g; potassium fluoroborate (KBF 4 ) 116.5g; Al-5RE 100g; Al-10Sr 50g; pure aluminum ingot 805g.

[0018] 2) Mix potassium fluorotitanate and potassium fluoroborate evenly and dry in a drying oven at 80°C for 60 minutes;

[0019] 3) Place the weighed pure aluminum ingot and Al-5RE alloy in a graphite crucible for heating. Once melted, the surface of the molten aluminum will be covered with flux. The composition ratio of the flux is as follows (mass percentage): 32-40% KCl, 3-5% Ca 2 F, 6-8BaCl 2 , 38-46% MgCl;

[0020] 4) Superheat the molten aluminum to 800°C, add the dried potassium fluotitanate and potassium fluoborate and stir until the reaction is complete;

[0021] 5) After standing for 10 minutes, add the Al-10Sr alloy weighed and stir, and remove...

Embodiment 2

[0025] Prepare 1Kg of compounding agent master alloy, its component weight percent is: Ti 5.0%, B1.0%, Sr5.0%, RE2.0%, A187.0%, preparation process is as follows.

[0026] 1) Ingredients: Potassium Fluotitanate (K 2 TiF 6 ) 250.6g; potassium fluoroborate (KBF 4 ) 116.5g; Al-5RE 400g; Al-10Sr 500g; pure aluminum ingot 40g.

[0027] 2) Mix potassium fluorotitanate and potassium fluoroborate evenly and dry in a drying oven at 80°C for 60 minutes;

[0028]3) Place the weighed pure aluminum ingot and Al-5RE alloy in a graphite crucible for heating. Once melted, the surface of the molten aluminum is covered with flux, 32-40% KCl, 3-5% Ca 2 F, 6-8BaCl 2 , 38-46% MgCl;

[0029] 4) Superheat the molten aluminum to 900°C, add the dried potassium fluotitanate and potassium fluoborate and stir until the reaction is complete;

[0030] 5) After standing for 10 minutes, add the Al-10Sr alloy weighed and stir, and remove slag after 20 minutes of heat preservation;

[0031] 6) add hexac...

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Abstract

The invention discloses a grain refinement and modification master alloy for aluminum and an aluminum alloy, which comprises the following components by weight percentage: 3.0 to 10.0 percent of titanium, 1.0 to 3.0 percent of boron, 0.5 to 5.0 percent of strontium, 0.5 to 2.0 percent of cerium-enriched rare earth, and the balance of aluminum. The preparation method for the master alloy comprises the following steps: weighting potassium fluotitanate, potassium fluoborate, a mixed rare earth ingot, an alloy, and a pure aluminum ingot in proportion; drying the potassium fluotitanate and the potassium fluoborate; heating and melting the aluminum ingot and the aluminum rare earth ingot, adding the mixture of the potassium fluotitanate and the potassium fluoborate, and stirring until the melted mass is completely reacted; adding a Al-Sr master alloy, stirring, and performing heat preservation and slagging off; adding hexachloroethane and evenly stirring; and standing, performing heat preservation for 20 to 30 minutes, casting into an ingot and then extruding into a wire. The master alloy can be well combined with an interface of an aluminum matrix; the particle phase is evenly distributed; the grain size of the refinement phase is small; the activated Sr is enough to ensure the following modification; the conglobation of the refinement phase is effectively reduced, and the degradation is inhibited; and the preparation process is low in cost.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy melting and casting, and in particular relates to a grain refinement and metamorphic master alloy for aluminum and aluminum alloy, and also relates to a preparation method of the master alloy. Background technique [0002] The quality of processed aluminum alloy products is affected by the microstructure of the slab, including the grain size of the initial α-Al, and for Al-Si alloys, the morphology distribution of the Si phase. Therefore, the refining process of aluminum alloy casting usually includes two aspects of grain refinement and modification. The method of grain refinement of aluminum alloy can be roughly divided into two categories: one is the endogenous nucleation particle method, that is, through certain means, such as electromagnetic action, ultrasonic vibration, rapid cooling method, etc., to change the number of crystal nuclei in the alloy Or hinder the nucleation and growth ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22C1/03
Inventor 彭继华李文芳聂铁安李绍康李烈军杨传柱赵璞玉陈英发许德英杜军张果戈
Owner 广州工业投资控股集团有限公司
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