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Modification Method of Hypoeutectic Cast Al-Si Alloy

A technology for casting aluminum-silicon alloys and aluminum-silicon alloys, which is applied in the field of preparation of Al-Si casting alloys and chemical modification of Al-Si casting alloys, can solve the problems of no research, limited application occasions, and no technical features provided. Achieve the effects of improving deterioration efficiency, reducing material costs, and reducing processing material costs and time costs

Active Publication Date: 2021-06-04
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] 3. The existing technology does not conduct relevant research on whether the addition of the rare earth element La can achieve synergistic effect with Sr to improve the metamorphic effect without damaging the grain refinement effect, which limits the application occasions of this technology;
[0007] 4. According to the applicant's recent research, the influence of Sr, La, and B mass fractions on the effect of modification and grain refinement is only a superficial phenomenon, and the real decisive factors are the mass ratio of Sr / B and La / B or RE / B mass ratio, the prior art does not provide this technical feature, and no relevant research has been carried out

Method used

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Embodiment 1

[0049] In this embodiment, a method for modifying a hypoeutectic cast aluminum-silicon alloy involves modifying an aluminum-silicon alloy with a silicon mass fraction of 10% to control the morphology and grain size of the eutectic silicon phase of a cast aluminum-silicon alloy , to obtain the hypoeutectic aluminum-silicon alloy structure; during the efficient modification of the hypoeutectic cast aluminum-silicon alloy, industrial silicon, industrial pure aluminum, Al-10Sr alloy, Al-10La alloy, and Al-3B alloy are used as raw materials. The mass percentage of elements is: Si: 10.000%, Sr: 0.015%, La: 0.049%, B: 0.020%, the balance is mainly Al, and the materials are prepared accordingly. Among them, Sr in the Al-10Sr alloy is Al 4 Exist in the form of Sr, La in Al-10La alloy as Al 11 La 3 、Al 4 La form exists, B in Al-3B alloy is AlB 2 The target hypoeutectic cast aluminum-silicon alloy is prepared according to the mass percentage requirements of the above elements, and the...

Embodiment 2

[0075] This embodiment is basically the same as Embodiment 1, and the special features are:

[0076] In this example,

[0077] The steps not specifically described are the same as those in Example 1, except that La is added at a mass percentage of 0.029%, and the mass ratio of La / B is 1.45 at this time.

Embodiment 3

[0079] The steps not specifically described are the same as those in Example 1, except that La is added at a mass percentage of 0.099% for feeding, and the La / B mass ratio is 4.95 at this time.

[0080] The changes in the modification effect and grain refinement effect of the cast aluminum-silicon alloy samples prepared in comparative example 2, embodiment 2, embodiment 1 and embodiment 3 are as follows Figure 5 As shown, when the La / B mass ratio is lower than 2.45, there is a critical value. When the La / B mass ratio is lower than this critical value, the alloy loses the modification effect and is in an unmodified state, but the primary aluminum grain size has no obvious Change; when the La / B mass ratio is greater than 2.45, the primary aluminum grain size tends to increase significantly, but the modification effect does not change significantly.

[0081] The results show that one of the decisive factors that really affects the modification effect of the hypoeutectic cast Al-...

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Abstract

The invention discloses a method for modifying a hypoeutectic cast aluminum-silicon alloy. The mass percentages of elements are Si: 6.000-12.600%, Sr: 0.001-0.150%, La or RE: 0.020-0.122%, and B: 0.001-0.150%. , and the mass ratio of Sr / B is not greater than 1.351, and the mass ratio of La / B or RE / B is between 1-5; the balance is Al for material preparation, and melting and casting is carried out through melting, refining degassing, feeding and heat preservation casting process Obtain the aluminum-silicon alloy, the grade of deterioration is 4-6 grade, and the validity period of deterioration is 2-3 hours. The invention reduces the total amount of Sr, La, and B by 62.3-72.5%, and the sum of the mass fractions of modifying elements is only 0.022-0.237%; the production time is reduced by 37.5-52.0%, only 60-100 minutes, and has a very high Economic Value.

Description

technical field [0001] The invention relates to a preparation method of Al-Si casting alloy, in particular to a chemical modification treatment method of Al-Si casting alloy, which is applied in the technical field of aluminum alloy smelting. Background technique [0002] For hypoeutectic Al-Si casting alloys, the mechanical properties of castings, especially the elongation, are obviously affected by the shape, size and distribution of eutectic silicon. For cast aluminum-silicon alloys with a silicon mass fraction greater than 6%, modification must be carried out. Usually The chemical modification method is used to modify the hypoeutectic cast aluminum-silicon alloy, that is, the purpose of changing the morphology and size of the eutectic silicon phase is achieved by adding a modification agent to it. Commercial hypoeutectic Al-Si alloy modifiers mainly include Na salt modifiers and Al-Sr master alloy modifiers. Sr-containing modifiers are more environmentally friendly and h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/04C22C1/03C22C1/06
CPCC22C1/026C22C1/03C22C1/06C22C21/04
Inventor 李谦李星睿黎阳
Owner SHANGHAI UNIV
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