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High mechanical property die-casting aluminum alloy and preparation method thereof

A technology for casting aluminum alloys and aluminum alloys, which is applied in the field of die-casting aluminum alloys with high mechanical properties and its preparation, can solve problems such as difficulty in meeting demands, and achieve the effects of improving strength, small thermal expansion coefficient, and avoiding aggregation and precipitation

Inactive Publication Date: 2017-04-26
DANYANG RONGJIA PRECISION MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, die-casting aluminum alloys are widely used, but for die-casting parts that require high mechanical properties such as car bodies, it is difficult to meet the demand only by existing die-casting aluminum alloys

Method used

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  • High mechanical property die-casting aluminum alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Prepare raw materials: nano aluminum powder with a particle size of 50-100nm, Al-Si alloy, Al-Cu alloy, Al-Fe alloy, Cu-Mg alloy, Al-Ti alloy, La and Ce;

[0031] (2) Pretreatment: Dry the raw materials at a drying temperature of 90°C and a drying time of 4 hours. At the same time, preheat the graphite crucible under vacuum at a temperature of 500°C;

[0032] (3) Rough smelting: first add Al-Fe alloy, Cu-Mg alloy, Al-Si alloy, Al-Cu alloy, Al-Ti alloy to the graphite crucible, heat up to 650℃, and keep stirring until the alloy is completely melted. Heat for 8min-12min, heat up to 900℃, add nano aluminum powder, La and Ce to the bottom of the graphite tongs pot, stir continuously until it melts, and let it stand for 1-2h to obtain a crude aluminum alloy melt;

[0033] (4) Refining: Preheat He first, the preheating temperature is 150℃, when the temperature of the graphite clamp pot is 750℃, He is blown into the crude aluminum alloy melt for refining, the refining time is 40m...

Embodiment 2

[0036] It is basically the same as Example 1, and the difference is that in step (5), a die-cast aluminum alloy A2 is prepared, and the composition and weight percentage of the die-cast aluminum alloy A2 are: Si is 8.5wt%, Mg is 11.8wt%, and Cu It is 3.6wt%, Ti is 0.2wt%, Fe is 0.8wt%, La is 0.03wt%, Ce is 0.04wt%, and the balance of Al is.

Embodiment 3

[0038] It is basically the same as Example 1, and the difference is that in step (5), a die-cast aluminum alloy A3 is prepared. The composition and weight percentage of the die-cast aluminum alloy A3 are: Mg is 1.2wt%, Cu is 2.5wt%, and Ti It is 0.1wt%, Fe is 0.2wt%, Ce is 0.03wt%, and Al balance.

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Abstract

The invention discloses a high mechanical property die-casting aluminum alloy and a preparation method thereof. Based on an existing die-casting aluminum alloy, a rare earth element La and a rare earth element Ce are added. The La is the hardest and densest metal in rare earth elements. The Ce is helpful to improve strength, tenacity, corrosion resistance and oxidation resistance. Meanwhile, the La and the Ce are surface-active elements, and capable of increasing wetting angles between aluminum melting bodies and particles, therefore, spreadability is improved, and aggregation and precipitation phenomena of the particles are effectively avoided. According to the high mechanical property die-casting aluminum alloy, nanometer aluminum powder is adopted to replace pure aluminum ingots, the prepared die-casting aluminum alloy has the advantages of being high in strength, small in thermal expansion coefficient and good in thermal stability. The proportion of alloy elements is adjusted, the preparation method of the die-casting aluminum alloy is optimized, effective alloy designing is carried out, the comprehensive mechanical property of the die-casting aluminum alloy is improved, and the application field of the die-casting aluminum alloy is widened.

Description

Technical field [0001] The invention belongs to the field of metal materials, and specifically refers to a die-cast aluminum alloy with high mechanical properties and a preparation method thereof. Background technique [0002] At present, aluminum alloy die-casting technology continues to develop, and more and more stressed parts are produced by aluminum alloy die-casting. Therefore, most buyers have put forward mechanical properties such as tensile strength of aluminum alloy die-casting parts. At present, the die-cast aluminum alloys used in industry mainly include the following series: Al-Si, Al-Mg, Al-Si-Cu, Al-Si-Mg, etc. The die-cast aluminum alloy has high specific strength, corrosion resistance and Good casting performance, processing performance and reproducibility, as well as excellent electrical and thermal conductivity, are widely used in automotive, aerospace and electrical industries and other fields. With the development of automobile and other industries, the outp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/02C22C1/03C22C1/06
CPCC22C21/02C22C1/026C22C1/03C22C1/06
Inventor 殷敏殷来大
Owner DANYANG RONGJIA PRECISION MACHINERY