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A melting preparation method suitable for high ag aluminum alloy

An aluminum alloy and alloy technology, which is applied in the field of non-ferrous metal material preparation, can solve the problems of performance degradation, low yield, and failure to achieve high yield, etc., and achieve the effect of reducing the holding time

Active Publication Date: 2019-11-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing technology and process of adding Ag to aluminum alloys cannot achieve a high yield, which affects the economical efficiency of the preparation of high-Ag aluminum alloy materials.
[0004] Therefore, a new process must be developed to solve the hot cracking and performance degradation of the material during the casting process caused by the segregation of Ag elements during the casting process, and the low yield of Ag during the casting process leads to an increase in the cost of material preparation

Method used

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  • A melting preparation method suitable for high ag aluminum alloy
  • A melting preparation method suitable for high ag aluminum alloy
  • A melting preparation method suitable for high ag aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Prepare 310kg containing Ag

[0046] Al-6.50%Cu-0.30%Mg-0.30%Mn-0.07%Zr-0.05%Ti-1.1%Ag aluminum alloy ingot, in which the content of Ag element added is 1.1%.

[0047] The melting and casting of the alloy is carried out according to the following steps: (1) First, the pure Ag ingot is rolled into a 0.2mm thick sheet, and then cut into 10×400mm 2 Clean the oil on it and dry it, wrap it with pure aluminum wire into 1.5-2.0kg / bundle, and configure the alloy material according to the alloy formula; (2) When the high-purity Al ingot and Al-Cu master alloy are being smelted When about half of the furnace is melted, the furnace temperature is adjusted to 760°C, and Ag bundles and Al-Mn, Al-Zr master alloys are dispersedly added; (3) After all of them are melted, the furnace temperature is reduced to 735°C and pure Mg and crystal Grain refiner Al-5%Ti master alloy, slowly stir the melt after all the raw materials are completely melted, and perform composition analysis, while supplem...

Embodiment 2

[0050] Prepare 310kg containing Ag

[0051] Al-6.70%Cu-0.28%Mg-0.30%Mn-0.05%Zr-0.05%Ti-1.85%Ag aluminum alloy ingot, in which the added content of Ag element is 1.85%.

[0052] The smelting and casting process of the alloy is basically the same as in Example 1, the difference is: (1) Ag ingots are made into 1.5×20×300mm 3 (2) Adjust the furnace temperature to 770℃ when Ag is added; (3) Add Al-5%Ti-1%B grain refiner when the furnace temperature is reduced to 720℃; (4) Degassing gas It is a mixed gas of high-purity argon and nitrogen, the gas pressure is 0.4 MPa, and the rotor speed is 200 revolutions per minute; (5) Adjust the melt temperature to 740°C and let it stand for 10 minutes.

[0053] The Ag content in the head and tail of the ingot is shown in Table 1. The yield of Ag element during the melting and casting process of the alloy is 99.5%.

Embodiment 3

[0055] Prepare 310kg containing Ag

[0056] Al-6.90%Cu-0.22%Mg-0.30%Mn-0.08%Zr-0.05%Ti-1.5%Ag aluminum alloy ingot, in which the added content of Ag element is 1.5%.

[0057] The melting and casting process of the alloy is basically the same as that of Example 1, except that: (1) Ag ingots are made into 2.0×30×200mm 3 (2) Adjust the furnace temperature to 780℃ when Ag is added; (3) Add Al-5%Ti grain refiner when the furnace temperature is lowered to 745℃; (4) The degassing gas is high purity The mixed gas of argon and nitrogen, the gas pressure is 0.3 MPa, and the rotor speed is 300 revolutions per minute; (5) Adjust the melt temperature to 740° C. and let it stand for 20 minutes.

[0058] The Ag content in the head and tail of the ingot is shown in Table 1. The yield of Ag element during the melting and casting of the alloy is 99.3%.

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Abstract

The invention relates to a smelting preparation method for high Ag aluminum alloy. The preparation method comprises the following steps: placing an Al ingot and an Al-Cu intermediate alloy into a smelting furnace, heating, melting, when the alloy melt coexists with the Al ingot and / or Al-Cu intermediate alloy solid, increasing the furnace temperature to 750 to 790 DEG C, dispersing and adding a silver sheet bundle or silver bar bundle into the smelting furnace, after the silver sheet bundle or silver bar bundle is molten, cooling the furnace to 720 to 745 DEG C, adding pure Mg and a grain refiner, melting, analyzing and adjusting an alloy melt component in 20 minutes, immediately performing the online refining to remove the gas, filtering, immediately transferring into an insulated bag, controlling the temperature of melt at 730 to 740 DEG C, standing in the insulated bag for less than or equal to 20 minutes, casting, and homogenizing and annealing an ingot blank in 1 to 5 hours. The high Ag aluminum alloy cast ingot prepared in the invention is high in component homogeneity, the yield of Ag is greater than or equal to 99 percent, and the economical performance in the smelting casting process of the high Ag aluminum alloy is improved. The method is suitable for smelting and casting high Ag 2,000-series, 6,000-series and 7,000-series aluminum alloy.

Description

Technical field [0001] The invention relates to a smelting preparation method suitable for high Ag aluminum alloys, in particular to a smelting preparation process of high Ag content aluminum alloys, and belongs to the technical field of non-ferrous metal material preparation. Background technique [0002] The Ag element plays an important role in aluminum alloys, and many aluminum alloys contain Ag elements; especially the new Al-Cu series high-strength heat-resistant aluminum alloys with a higher degree of alloying developed in recent years, and Ag is the main one. Alloying elements; such as a high heat resistance Al-Cu-Mg-Ag alloy (ZL200810030979.1) invented by this research group, and a method for improving the mechanical properties of aluminum-copper-magnesium-silver alloys after solid solution cold deformation (ZL201110093645) .0), and an aluminum-copper-magnesium-silver alloy with excellent high-temperature performance and its heat treatment method (ZL201618000350.8). The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/03C22C1/06C22C21/12C22F1/057
CPCC22C1/026C22C1/03C22C1/06C22C21/12C22F1/057
Inventor 刘志义曹靖陈烨王建柏松
Owner CENT SOUTH UNIV
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