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Nano granule reinforced high-tough cast magnesium alloy and its preparing and shaping process

A technology for casting magnesium alloys and nanoparticles, applied in the field of magnesium alloys, can solve the problems of small batch size, high equipment requirements, and high cost, and achieve effective distribution and strengthening effects, excellent mechanical properties, and improved strength and toughness

Inactive Publication Date: 2005-10-05
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of preparing nanoparticle-reinforced magnesium-based composites using mechanical alloying is suitable for the preparation of nanoparticle-reinforced deformed magnesium alloy materials (H.Ferkel et al., Materials Science and Engineering A, 2001, Vol 298), and the preparation of nanoparticle-reinforced magnesium by ultrasonic technology Alloy materials also have certain effects (Jie Lan et al., Materials Science and Engineering A, 2004, Vol 386), but the above methods all have the limitations of complex process, high equipment requirements, small preparation batches, and high cost, and are not suitable for nanoparticle strengthening. Preparation and Forming Technology of Cast Magnesium Alloy Material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Alloy composition (weight percentage): 6.0% Al, 0.3% Zn, 0.4% Mn, 0.03% Si, and the remaining impurity content is less than 0.02%.

[0024] The pretreatment process of nano-SiC particles is as follows: pour 500ml of analytical pure ethanol into a beaker, put 50g of dry SiC nanoparticles into the beaker, stir and fully wet, add 10ml of dilute solution of polyvinyl alcohol to SiO particles and ethanol The mixture is fully stirred and mixed evenly; the above mixture containing SiC nanoparticles is baked in an oven and dried, and the baking temperature is 85°C.

[0025] The preparation and forming process is: adding 2kg of magnesium alloy material to a dry crucible brushed with paint. In order to prevent the magnesium alloy from oxidizing and burning during the smelting process, a covering agent and high-purity argon gas are used for protection, and the melt temperature is maintained at 700 ℃ after melting. ; Control the temperature of the magnesium alloy liquid to 660°C, remov...

Embodiment 2

[0028] Alloy composition (weight percentage): 7.0% Al, 0.2% Zn, 0.2% Mn, 0.04% Si, and the remaining impurity content is less than 0.02%.

[0029] The pretreatment process of nano SiC particles is: pour 500ml of analytical pure ethanol into a beaker, put 150g of dry SiC nanoparticles into the beaker, stir and fully wet, add 25ml of dilute solution of polyvinyl alcohol to the SiC particles and ethanol In the mixture, fully stir and mix uniformly; the above-mentioned mixture containing SiC nanoparticles is baked in an oven and dried at a baking temperature of 90°C.

[0030] The preparation and forming process is as follows: add 2kg of magnesium alloy material to a dry crucible brushed with paint. In order to prevent the magnesium alloy from oxidizing and burning during the smelting process, a covering agent and high-purity argon gas are used for protection, and the melt temperature is kept at 720℃ after melting. ; Control the temperature of the magnesium alloy liquid to 700℃, remove...

Embodiment 3

[0033] Alloy composition (weight percentage): 7.5% Al, 0.1% Zn, 0.3% Mn, 0.03% Si, and the remaining impurity content is less than 0.02%.

[0034] The pretreatment process of nano-SiC particles is as follows: pour 500ml of analytical pure ethanol into a beaker, put 100g of dry SiC nanoparticles into the beaker, stir and fully wet, add 20ml of dilute solution of polyvinyl alcohol to the SiC particles and ethanol The mixture is fully stirred and mixed evenly; the above mixture containing SiC nanoparticles is baked in an oven and dried, and the baking temperature is 95°C.

[0035] The preparation and forming process is as follows: add 2kg of magnesium alloy material to a dry crucible brushed with paint. In order to prevent the magnesium alloy from oxidizing and burning during the smelting process, a covering agent and high-purity argon gas are used for protection, and the melt temperature is kept at 720℃ after melting. ; Control the temperature of the magnesium alloy liquid to 680 ℃,...

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Abstract

This invention provides a nano grain reinforcing high tenacity founding magnesium alloy and its preparation method, and belongs to magnesium alloy technology field. The components are: 5.0-10.0% Al, 0.1-1.0%Zn, 0.05-0.5%Mn, limiting element Si is less than or equal to 0.05%, Fe is less than or equal to 0.005%, Cu is less than or equal to 0.01%, Ni is less than or equal to 0.002%, and the rest is Mg. The grains are SiC grains with diameter less than 100nm, the adding amount is 0.1-3.0% of alloy volume content. Add pre-treated block nanometer grains in the melted liquid or half-solid magnesium alloy solution and make it dispersively distribute in the alloy and get the needed cast through gravity moulding and die casting. The strong points of this invention are: under the conditions of gravity moulding and die casting, the pulling resistance intension is more than 230MPa, and the extending ratio is more than 15%, and has good comprehensive performance. The magnesium alloy has good fluidity, and is suitable for the casting in cool chamber.

Description

Technical field [0001] The invention belongs to the technical field of magnesium alloys, and in particular provides a nano-particle reinforced high-strength and toughness cast magnesium alloy and a preparation and forming process thereof. Background technique [0002] Magnesium alloy is the lightest kind of modern metal structural materials, with a density of about 1.7g / cm 3 , About 1 / 4 of steel and 2 / 3 of aluminum. Magnesium is abundant in the earth's crust and seawater. China's magnesium resources are particularly abundant, and the reserves rank first in the world. The advantages of magnesium alloys are low density, high specific strength, high specific rigidity, good shock absorption, and also have excellent casting performance, cutting performance, thermal conductivity and electromagnetic shielding ability. They are widely used in automobile manufacturing, aviation, Aerospace, optical instrument manufacturing and national defense and other fields. Therefore, magnesium-based m...

Claims

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Application Information

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IPC IPC(8): C22C1/02C22C1/04C22C23/02
Inventor 康永林王朝辉
Owner UNIV OF SCI & TECH BEIJING
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