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Aluminium-silicon-copper-magnesium pack alloy and its preparing process

A technology of casting aluminum alloy and preparation process, applied in the field of metal materials, can solve the problems of air leakage, shrinkage porosity and poor plasticity of die-casting products

Inactive Publication Date: 2006-02-08
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1). Poor plasticity and poor machinability, making die-casting products difficult to machine
[0005] (2). The airtightness of die-casting parts is poor. During the smelting process, it is easy to generate air inhalation to increase the gas content, and shrinkage, pores and other defects are formed in the product, which makes the die-casting product leak during use.
[0006] (3). The wear resistance is poor. Due to the relatively high Si content, large massive phases are easily produced in the hypereutectic alloy structure, and the distribution is uneven, and the material is easy to wear
[0007] Due to the poor air tightness and poor wear resistance of the above-mentioned aluminum-silicon-copper-magnesium die-casting aluminum alloys, it is not suitable for precision valve bodies, automobiles, aviation parts and other parts that have high requirements for air tightness and wear resistance.

Method used

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  • Aluminium-silicon-copper-magnesium pack alloy and its preparing process
  • Aluminium-silicon-copper-magnesium pack alloy and its preparing process
  • Aluminium-silicon-copper-magnesium pack alloy and its preparing process

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Prepare 25 kg of aluminum-silicon-copper-magnesium die-casting aluminum alloy containing 13.5% silicon, 1.5% copper, 0.3% magnesium, 0.8% iron, 0.25% manganese, and the balance is aluminum (the composition ratios are all mass percentages, the same below). The process is as follows:

[0026] (1). Resistance crucible furnace and cast steel crucible are used;

[0027] (2). Raw material preparation: aluminum ingot (aluminum≥99.7wt%); silicon block (silicon≥99.0wt%); pure copper block (copper≥99.95wt%); pure magnesium block (magnesium≥99.95wt%); Iron master alloy (containing 80wt% aluminum, 20wt% iron); aluminum-manganese master alloy (containing 90wt% aluminum, 10wt% manganese);

[0028] Refer to "Casting Handbook" (Volume 3, Casting Non-ferrous Alloys, 2nd Edition, Machinery Industry Press, 2001.10, P187-188) and empirically determine the burning loss of alloying elements, aluminum: 1.5%, silicon: 1%, magnesium : 20%, Manganese: 0.8%

[0029] Addition calculation formul...

Embodiment 2

[0056] Prepare 25 kg of aluminum-silicon-copper-magnesium die-casting aluminum alloy containing 15.0% silicon, 3.5% copper, 0.3% magnesium, 1.0% iron, 0.3% manganese, and the balance is aluminum.

[0057] Take the same processing steps as in Example 1, wherein the amount of each raw material added in step (2) is: 18.67 kilograms of aluminum ingot, 3.82 kilograms of silicon block, 0.875 kilogram of pure copper, 0.094 kilogram of magnesium block, 1.25 kilogram of aluminum-iron master alloy, aluminum Manganese master alloy 0.76 kg;

[0058] The composition of the obtained alloy is: 15.0% of silicon, 3.5% of copper, 0.3% of magnesium, 1.0% of iron, 0.3% of manganese, impurity content≤0.15%, and the balance is aluminum. The tensile strength of the alloy in the as-cast state is 266.4MPa, the elongation after fracture is 1.98%, and the hardness is HB102.

Embodiment 3

[0060] Prepare 25 kilograms of aluminum-silicon-copper-magnesium die-cast aluminum alloy containing 14.5% silicon, 2.3% copper, 0.3% magnesium, 1.0% iron, 0.3% manganese, and the balance is aluminum.

[0061] Take the same processing steps as in Example 1, wherein the amount of each raw material added in step (2) is: 19.10 kilograms of aluminum ingot, 3.69 kilograms of pure silicon, 0.575 kilograms of pure copper, 0.094 kilograms of pure magnesium block, 1.25 kilograms of aluminum-iron master alloy, 0.76 kg of aluminum-manganese master alloy.

[0062] The composition of the obtained alloy is: 14.5% of silicon, 2.3% of copper, 0.3% of magnesium, 1.0% of iron, 0.3% of manganese, impurity content≤0.15%, and the balance is aluminum. The tensile strength of the alloy in the as-cast state is 264.1MPa, and the elongation after fracture is 2.01%. Hardness HB98.

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Abstract

The invention relates to an aluminium-silicon-copper-magnesium pack alloy and its preparing process, wherein the chemical constituents of the alloy include (by mass percent): silicon 13.0-15.0%, Cu 1.5-3.5%, Mg<=0.3%, Fe<=1.3%, Mn<=0.5%, impurity content <=0.15%, and balancing Al. The raw materials are prepared in a crucible furnace with a smelting temperature of 680-750 deg. C, after the pure aluminium and intermediate alloy are melt, silicon blocks and copper ingots are charged into the aluminium solution, magnesium blocks are charged in at 680-700 deg C, the pouring temperature is 660-720 deg C. The prepared alloy has a cast-state tensile strength of above 264 MPA, and a hardness of around HB95.

Description

technical field [0001] The invention belongs to the field of metal materials, and relates to an aluminum-silicon-copper-magnesium series die-casting aluminum alloy with high strength, good air tightness and excellent wear resistance and a preparation process thereof. Background technique [0002] General Al-Si alloys have the disadvantages of relatively low strength and unsatisfactory anodization. At present, Al-Si-Cu alloys are mainly used instead of Al-Si alloys. Al-Si-Cu-Mg series die-casting aluminum alloys are widely used high-strength aluminum alloys, and most of them use hypoeutectic and eutectic components. Composition of high-strength Al-Si-Cu-Mg die-casting aluminum alloy YL112 independently developed by my country: silicon 7.5-9.5, copper 3.0-4.0, magnesium ≤ 0.3, manganese ≤ 0.5, iron ≤ 1.2, lead ≤ 0.1, nickel ≤ 0.5, Aluminum balance; YL113 composition: silicon 9.6-12.0, copper 1.5-3.5, magnesium ≤ 0.3, manganese ≤ 0.5, iron ≤ 1.2, lead ≤ 0.1, nickel ≤ 0.5, alumi...

Claims

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Application Information

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IPC IPC(8): C22C21/02C22C1/02C22C1/06
Inventor 边秀房张士佼孟庆格王才东
Owner SHANDONG UNIV
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