Refiner for aluminum alloy and preparation method

A technology of refiner and aluminum alloy, which is applied in the field of aluminum alloy refiner, can solve the problems of increasing the cost of alloy manufacturing and achieve the effect of improving strength

Active Publication Date: 2015-10-07
HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

However, the addition of rare earth elements increases the cost of alloy manufacturi

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  • Refiner for aluminum alloy and preparation method
  • Refiner for aluminum alloy and preparation method
  • Refiner for aluminum alloy and preparation method

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[0024] The following examples describe the present invention in more detail.

[0025] According to the weight ratio of 4.5-5.5% titanium, 0.2-0.4% cerium, 0.6-1.8% magnesium and the balance of aluminum, in N 2 and SF 6 The smelting is carried out under a protective atmosphere. The smelting is carried out in an induction furnace. During smelting, the voltage is controlled at 300-400V, the current is controlled at 100-120A, and the melting temperature is 1200°C-1300°C. During the smelting process, first add pure aluminum ingots, After it melts, wrap it with aluminum foil, and use a bell jar to press the titanium powder under the liquid surface of the aluminum melt. After adding the titanium powder, stand still for ten minutes, and use a graphite bell jar to put Mg-30Ce (containing Mg element 70wt%, The master alloy containing 30wt% Ce element) is pressed under the liquid surface of the aluminum alloy melt, and after standing still for five minutes, the alloy melt is stirred by ...

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Abstract

The invention provides a refiner for aluminum alloy and a preparation method. The refiner for the aluminum alloy comprises, by weight, the components of 4.5-5.5% of titanium, 0.2-0.4% of cerium, 0.6-1.8% of magnesium and the balance aluminum. The refining effects of two refiners of Al-5Ti and Al-5Ti-0.7Mg-0.3Ce on Ai-Si alloy are compared to find that the refining effect of the Al-5Ti-0.7Mg-0.3Ce is better than that of the Al-5Ti due to the fact that the size of Al3Ti in the Al-5Ti-0.7Mg-0.3Ce is obviously smaller than that of the Al-5Ti in the Al-5Ti-0.7Mg-0.3Ce, therefore, the quantity of heterogeneous nucleation is increased, and the refining effect is more obvious; in addition, an element Mg and rare earth elements are filled in the interface of an alpha-Al dendritic crystal and eutectic silicon, therefore, the growth of the alpha-Al dendritic crystal is prevented, the improvement of the refining effect is facilitated, and more remarkable, the improvement effect of the interaction effect of the element Mg and the rare earth elements for a refining structure is more obvious than that of a single rare earth element.

Description

technical field [0001] The invention relates to an aluminum alloy refiner. Background technique [0002] Aluminum alloy has the advantages of light weight, good corrosion resistance, excellent electrical conductivity and good weldability, and is widely used in the fields of aerospace and automotive electronics. However, the solidification structure of cast aluminum alloy has the characteristics of coarse grains and a large number of columnar crystals, which affects its mechanical properties and the further production and processing of aluminum alloy parts. Therefore, it is necessary to take various measures to refine the solidification structure of aluminum alloy to obtain a fine and uniform equiaxed grain structure. [0003] The refining method of aluminum alloy is mainly to add a refining agent to the aluminum melt. Currently, the commonly used refining agents in production include Al-5Ti, Al-Ti-B, Al-Ti-C, etc., among which Al-5Ti, Al -Ti-B is the most widely used. Thes...

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Application Information

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IPC IPC(8): C22C21/00C22C1/03
Inventor 尹冬松赵继涛张忠凯安勇良毛新宇王振玲徐海杰于朝阳陈永生王春阳王振廷徐家文宋良刘兴李洲陈睿
Owner HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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