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Tissue control method for near-eutectic cast aluminum-silicon alloy

A technology of casting aluminum-silicon alloy and control method, which is applied in the field of structure control of near-eutectic aluminum-silicon alloy, can solve the problems of being difficult to apply to actual production and high price, and achieve the effects of cheap price, improved comprehensive performance and abundant resources

Active Publication Date: 2014-07-23
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The study found that rare earth Sc and Y have obvious refining effect on aluminum alloy, but they are expensive and not easy to apply in actual production

Method used

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  • Tissue control method for near-eutectic cast aluminum-silicon alloy
  • Tissue control method for near-eutectic cast aluminum-silicon alloy
  • Tissue control method for near-eutectic cast aluminum-silicon alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The cast aluminum-silicon alloy was prepared according to the above steps. In step 1), the composition mass percentage was set as Si: 11%, and the rest was Al. In step 3), lanthanum is selected as the rare earth and added in the form of master alloy Al-10La, and the mass percentages of B and La are 0.03%-0.05% and 0.05%-0.1% respectively. like image 3 As shown, the cast Al-11Si alloy prepared by joint refinement of boron and rare earth lanthanum was obtained. Obtain equiaxed primary aluminum with an average size of 40-50 microns, and at the same time, the modification effect of eutectic silicon is equivalent, which can be seen Figure 4 .

Embodiment 2

[0037] The cast aluminum-silicon alloy was prepared according to the above steps. In step 1), the composition mass percentage was set as Si: 11%, and the rest was Al. In step 3), cerium is selected as the rare earth and added in the form of master alloy Al-10Ce, and the mass percentages of B and Ce are 0.03%-0.05% and 0.05%-0.15% respectively. like Figure 5 As shown, the cast Al-11Si alloy prepared by joint refinement of boron and rare earth cerium was obtained. Obtain equiaxed primary aluminum with an average size of 35-45 microns, and the eutectic silicon modification effect is equivalent, it can be seen Image 6 .

Embodiment 3

[0039]The cast aluminum-silicon alloy was prepared according to the above steps. In step 1), the composition mass percentage was set as Si: 11%, and the rest was Al. The rare earth in step 3) is mixed rare earth, which is added in the form of master alloy Al-10Re, and the mass percentages of B and Re are 0.03%-0.05% and 0.08%0.12% respectively. like Figure 7 As shown, the cast Al-11Si alloy prepared by joint refinement of boron and mixed rare earth was obtained. Obtain equiaxed primary aluminum with an average size of 30-40 microns, and the modification effect of eutectic silicon is equivalent, which can be seen Figure 8 .

[0040] refer to figure 1 Low-magnification metallographic photograph of Al-11Si with boron added and no rare earth added. In the photo, the white is coarse and developed primary aluminum, and the black is fibrous eutectic silicon.

[0041] refer to figure 2 The high-magnification metallographic photograph of Al-11Si with boron added and no rare ear...

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Abstract

The invention relates to a tissue control method for near-eutectic cast aluminum-silicon alloy. The method comprises the following steps: preparing raw materials, namely commercially pure aluminum, ZL102, Al-Sr, Al-B and one of Al-La, Al-Ce and Al-Re, in a manner that the raw materials contain the following ingredients in percentage by mass: 9-12% of Si, 0.05-0.5% of B, 0.01-0.1% of La, Ce or RE, 0.02-0.03% of Sr and the balance of Al; then carrying out smelting of the following steps: preheating the raw materials, heating an empty furnace, then, adding ZL102 and the commercially pure aluminum, and heating for melting; adding a sodium-free refining agent of which the mass accounts for 0.4-0.6% the total mass of the raw materials; treating a melt treated in the step (2) by adopting a boron and rare-earth combined refining method; carrying out secondary refining treatment on the melt; cooling to 690-700 DEG C, adding an Al-Sr alterant after temperature is stabilized, pressing the alterant into the bottom of the melt, and stirring, so as to enable the alterant to be thoroughly dissolved into the melt; carrying out heat preservation for 10-20 minutes at the temperature of 700 DEG C, then, heating to 720-730 DEG C, casting the melt into a metal mold which is preheated at the temperature of 200-250 DEG C, cooling, and then, taking out a casting.

Description

technical field [0001] The invention relates to a method for controlling the structure of a near-eutectic aluminum-silicon alloy. Background technique [0002] Fine-grain strengthening is one of the most important methods to improve the mechanical properties of materials. Casting aluminum alloys can achieve fine-grain strengthening by adding a refiner to it. At present, the common aluminum alloy refiners mainly include binary Al-Ti, Al-B and other alloys, ternary Al-Ti-B, Al-Ti-C and other alloys, and KBF 4 、K 2 ZrF 6 etc. as the main component of the compound salt. However, when these refiners are applied, there will be a decline in refinement, and the interaction between the refiner and other elements, such as the "poisoning" phenomenon of B and Sr. How to solve the interaction of these refiners so that the components can play the role of refiners is very necessary to improve the mechanical properties of cast aluminum-silicon alloys. [0003] As "industrial vitamins",...

Claims

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Application Information

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IPC IPC(8): C22C1/03C22C1/06C22C21/04
Inventor 陆韬潘冶陶诗文陈宇
Owner SOUTHEAST UNIV
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