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Aluminum silicon alloy series possessing granulated silicon phase and its process

A technology of an aluminum-silicon alloy and a process method, which is applied to the aluminum-silicon alloy series with a granular silicon phase and the process field thereof, can solve problems such as difficult popularization and application, difficult production process, etc., achieve high wear resistance, and avoid process difficulties. , light weight effect

Inactive Publication Date: 2004-11-17
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these high-temperature overheating treatments bring many technical difficulties to production, making it difficult to popularize and apply

Method used

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  • Aluminum silicon alloy series possessing granulated silicon phase and its process
  • Aluminum silicon alloy series possessing granulated silicon phase and its process
  • Aluminum silicon alloy series possessing granulated silicon phase and its process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026]The chemical composition of the electrolytic eutectic aluminum-silicon alloy ingot is: Si 12.12%, Cu 0.88%, Mg 0.91%, Mn 0.01%, Ni 0.81%, Fe 0.25%, Ti 0.09%, Srfigure 1 ). After solution treatment at 500°C for 6 hours, the silicon phase transformed into particles, which were evenly distributed on the aluminum substrate, most of which were less than 5 μm in size. (See figure 2 ).

Embodiment 2

[0028] Electrolytic eutectic Al-Si alloy ingot. Chemical composition and melting process are the same as Example 1. Remelt 3 times. After solid solution treatment at 500°C for 6 hours, the silicon phase transforms into particles, which are evenly distributed on the aluminum substrate, with a slight increase in size, most of which are still less than 10 μm (see image 3 ). It shows that the spheroidization property of the silicon phase of the electrolytic Al-Si alloy gradually weakens with the increase of remelting times.

Embodiment 3

[0030] The chemical composition of the hypereutectic aluminum-silicon alloy is Si 13.7%, Cu 0.98%, Mg 0.55%, Mn 0.49%, Ni 0.30%, Fe 0.26%, Ti 0.08%, and Srfigure 1 Description), Al-25% Si master alloy. Melt in a resistance furnace. Raise the temperature to 720°C and degas with nitrogen. No modifiers are added. 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, no primary silicon phase appears, and the Al-Si eutectic and a large number of dendritic primary aluminum phases are the main components. The silicon phase is metamorphic, unusually fine and distorted. After solution treatment at 500°C for 6 hours, the silicon phase transformed into particles, which were evenly distributed on the aluminum substrate, most of which were less than 5 μm in size. Some larger silicon phases are distributed around the eutectic (see Figure 4 ). It shows that the addition...

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Abstract

The invention relates to an aluminum silicon alloy series possessing granulated silicon phase and its preparation process, wherein the alloy comprises the constituents of (wt%) Si 11.5-17.0, Cu 0.5-5.0, Mg 0.2-1.5, Ni 0.5-3.0, Mn 0.1-0.9, Zn<1.0, Fe<1.3, Ti 0.02-0.30, and balancing Al. The cast metallurgical structure consists of deteriorated or less-deteriorated aluminium-silicon eutecticevaporate and arborescent crystal form aluminium, and the heat treated metallurgical structure comprises aluminium matrix and adequately distributed granular silicon phase. The invention also discloses the process for preparing the alloy.

Description

technical field [0001] The invention relates to an aluminum-silicon alloy series with granular silicon phase and a process method thereof. More precisely, aluminum-silicon alloys with different amounts of silicon are formed by adding or not adding aluminum-silicon intermediate alloys to electrolytic aluminum-silicon alloys (usually with a silicon content <12%), and then adding a small amount of modifiers such as strontium or rare earth or sodium salts or not. Al-Si alloys composed entirely of modified or under-modified eutectics can be obtained by modification treatment. After solid solution treatment, these silicon phases are transformed into granular silicon phases. Background technique [0002] Aluminum-silicon alloy is a lightweight metal material with high specific strength and wear resistance. 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 th...

Claims

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Application Information

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IPC IPC(8): C22C21/02
Inventor 王汝燿鲁薇华
Owner DONGHUA UNIV
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