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Hypereutectoid alpax with eutectic structure and technological method thereof

A technology of eutectic structure and aluminum-silicon alloy, which is applied in the field of hypereutectic aluminum-silicon alloy to achieve the effect of avoiding shrinkage porosity

Inactive Publication Date: 2003-10-22
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hypereutectic electrolytic aluminum-silicon alloys with more than 12% silicon cannot be produced at present

Method used

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  • Hypereutectoid alpax with eutectic structure and technological method thereof
  • Hypereutectoid alpax with eutectic structure and technological method thereof
  • Hypereutectoid alpax with eutectic structure and technological method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Hypereutectic aluminum-silicon alloy chemical composition Si13.7%, Cu0.98%, Mg0.55%, Mn0.49%, Ni0.30%, Zn0.010%, Fe0.26%, Ti0.08%, Srfigure 1 Description), Al-25% Si master alloy. Melt in a resistance furnace. Raise the temperature to 720°C and degas with nitrogen. After 15 minutes of heat preservation, pour into the metal mold preheated to 300°C. The sample size is 45×50×120mm. In the as-cast metallographic structure of the alloy (see figure 2 ) does not appear primary silicon phase, aluminum silicon eutectic and a large number of dendritic primary aluminum phase as the main composition. The silicon phase in the center of the eutectic is metamorphic, extremely fine and distorted, while the eutectic silicon on the grain boundaries is somewhat coarsened. It shows that the hypereutectic aluminum-silicon alloy with electrolytic aluminum-silicon alloy as the main body can still maintain the original self-modifying property after adding a small amount of silicon.

Embodiment 2

[0026] The chemical composition of the hypereutectic aluminum-silicon alloy is Si15.4%, Cu1.05%, Mg0.52%, Mn0.50%, Ni0.28%, Zn0.010%, Fe0.32%, Ti0.08%, Sr0 .001%. The charge composition and melting process are as in Example 1. The as-cast structure of the alloy is basically composed of Al-Si eutectic, and a small amount of primary Al phase is distributed on the Al-Si eutectic grain boundary. Eutectic silicon is under-modified, and a considerable part is in the form of short rods ( image 3 ) and appear angular primary silicon phases with a size of about 10 μm ( Figure 4 ). It shows that when more Al-25% Si master alloy is added, the inherent self-modification performance of the electrolytic aluminum-silicon alloy is greatly reduced due to too many undissolved silicon crystals. At this time, there is also a slight silicon phase floating

Embodiment 3

[0028] The chemical composition of the hypereutectic aluminum-silicon alloy is Si15, 7%, Cu1.00%, Mg0.55%, Mn0.50%, Ni0.28%, Zn0.010%, Fe0.33%, Ti0.09%, Sr0 .0051%. Charge composition and melting process are the same as Example 1. After degassing, Al-10% Sr master alloy is added for modification treatment. Stir well and let sit for another 15 minutes before pouring. The sample is the same as Example 2. The as-cast metallographic structure of the alloy is basically composed of Al-Si eutectics, and each eutectic is surrounded by the Al phase ( Figure 5 ). The silicon phase in the center of the eutectic has been fully modified and is very fine, but the silicon phase on the grain boundary is distributed in the form of short rods on the aluminum matrix in a radial manner. The amount of aluminum phase is greatly increased than that of the alloy without strontium modification (Example 2). It shows that when the silicon content of the alloy is close to 16% of the non-equilibriu...

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Abstract

The present invention relates to a hyper-eutectic aluminium-silicon alloy with eutectic structure and its technological process. It is characterized by that in the electrolysis of aluminium silicon alloy (generally, Si content is in the range of 6-12 wt%) the aluminium silicon intermediate alloy is added, and in the melt small quantity of strontium or rare earth or sodium salt can be added or notbe added so as to obtain complete eutectic structure, and the nascent silicon can not be produced. Its method includes the following steps: melting electrolytic aluminium silicon alloy and their intermediate alloy, heating to above 150 deg.C, gas-removing and refinering, adding or no adding Al-Sr intermediate alloy or Al-Re intermediate alloy, uniformly stirring, then standing still for 15 min. so that it can be used for pouring cast.

Description

Technical field: [0001] The invention relates to a hypereutectic aluminum-silicon alloy with eutectic structure or metamorphic eutectic structure and a process method. More precisely, the Al-Si master alloy is added to the electrolytic aluminum-silicon alloy (Si<12%) to form a hypereutectic composition (Si>12%), and then a small amount of modifiers such as strontium or rare earth or sodium salt are added, or not Modification treatment can suppress the precipitation of primary silicon, so as to obtain a hypereutectic aluminum-silicon alloy with metamorphic eutectic structure. Background technique: [0002] Hypereutectic Al-Si alloy is a lightweight and wear-resistant material. With the increase of silicon content, the wear resistance of the alloy is further improved, but the coarse and angular primary silicon is precipitated, which deteriorates the mechanical properties and processing properties of the alloy. The toughness, strength and processability of the alloy can...

Claims

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Application Information

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IPC IPC(8): C22C21/04
Inventor 王汝耀鲁薇华
Owner DONGHUA UNIV
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