Magnesium/solid and liquid magnesium composite casting forming method
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A solid-liquid composite, casting molding technology, used in rotors, cylinders, heat exchange equipment and other directions, can solve the problems of thick interface reaction layer, complex process, many cracks and holes, etc., to achieve less cracks and holes and other defects, shear resistance Excellent mechanical properties and high bonding strength
Active Publication Date: 2015-02-25
UNIV OF SCI & TECH BEIJING
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[0005] The content of the present invention is to overcome the deficiencies in the prior art, and prepare magnesium / magnesium composite castings with the solid-liquid composite method, aiming to solve the complex process, poor repeatability, product shape and size that exist in the preparation of magnesium / magnesium composite materials in the existing process. Limitation, thick and uneven interface reaction layer, many defects such as cracks and holes, and low interface bonding strength
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Embodiment 1
[0024] Example 1: AZ31 / AZ91D Composite Casting
[0025] Magnesium alloy grade and composition:
[0026] AZ91D magnesium alloy, its mass fraction: Al8.5~9.5%, Zn0.45~0.90%, Mn0.17~0.40%, Si≤0.05%, Cu≤0.025%, Ni≤0.001%, Fe≤0.004%, others Element ≤ 0.10% and total ≤ 0.40%, the rest is Mg.
[0027] Magnesium alloy grade and composition:
[0028] AZ31 magnesium alloy, its mass fraction: Al2.5~3.1%, Zn0.82~0.90%, Mn0.30~0.50%, Si≤0.05%, Ca≤0.05%, Be≤0.10%, Fe≤0.005%, others Element ≤ 0.10% and total ≤ 0.40%, the rest is Mg.
[0029] Specific steps:
[0030] (1) Mechanically treat and chemically clean the surface of the AZ31 magnesium rod with a size of Φ30×110mm (diameter 30mm, length 110mm) obtained by machining, and remove oil stains and oxides on the surface. The mechanical treatment is to use 400#, 600#, 800#, 1000#, 1500#, 2000# sandpaper to polish in order to make the surface of the magnesium rod obtain the required roughness; the chemical cleaning is to use 5% NaOH solut...
Embodiment 2
[0035] Embodiment 2: AZ31 / AZ61 composite casting process
[0036] Magnesium alloy grade and composition:
[0037]AZ31 magnesium alloy, its mass fraction: Al2.5~3.1%, Zn0.82~0.90%, Mn0.30~0.50%, Si≤0.05%, Ca≤0.05%, Be≤0.10%, Fe≤0.005%, others Element ≤ 0.10% and total ≤ 0.40%, the rest is Mg.
[0038] Magnesium alloy grade and composition:
[0039] AZ61 magnesium alloy, its mass fraction: Al5.5~7.5%, Zn0.5~1.5%, Mn0.15~0.40%, Si≤0.10%, Fe≤0.01%, Si≤0.10%, Ni≤0.005%, other elements ≤0.10% and total ≤0.40%, the rest is Mg
[0040] Specific steps:
[0041] (1) Mechanically treat and chemically clean the surface of the AZ31 magnesium rod with a size of Φ30×110mm (diameter 30mm, length 110mm) obtained by machining, and remove oil stains and oxides on the surface. The mechanical treatment is to grind with 400#, 600#, 800#, 1000#, 1500#, 2000# sandpaper in order to obtain the required roughness on the surface of the magnesium rod; the chemical cleaning is to use 5% NaOH solution,...
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Abstract
The invention provides a magnesium/solid and liquid magnesium composite casting forming method and belongs to the field of material machining engineering. According to the method, solid magnesium alloy is arranged in magnesium alloy melt for preparation of magnesium-coated magnesium castings. The method includes the following steps that (1) the solid magnesium alloy is machined, so that a required material type is acquired, and the ideal surface roughness is acquired through turning and grinding; (2) the surface of the prefabricated solid magnesium alloy is chemically washed, so that oil dirt and oxide on the surface are removed; (3) magnesium alloy with other components is smelted until the magnesium alloy is completely fused; (4) the treated magnesium alloy of the different material type is inserted in the magnesium alloy melt, wherein the temperature is kept between 610 DEG C to 690 DEG C in the inserting process; (5) after the treated magnesium alloy is inserted, the temperature is maintained for 5 min to 15 min, and then the whole melt is taken out and cooled through air to the indoor temperature. According to the solid and liquid magnesium composite casting forming method, the metallurgical combination purpose that an interface of the magnesium alloy with the different components is completely even is achieved, the defects of magnesium alloy with a single component are overcome, the interface is excellent in tensile resistance and shearing resistance mechanical property and high in ductility and toughness, and therefore the magnesium alloy is hopefully and widely applied to the fields of traffic, national defense, aviation, aerospace, chemical engineering and the like.
Description
technical field [0001] The invention relates to a magnesium / magnesium solid-liquid composite casting molding method, which belongs to the field of material processing engineering. Background technique [0002] As the lightest industrial metal structural material, magnesium alloy has many characteristics such as high specific strength, high specific stiffness, and excellent damping performance. Its products are widely used in aviation, aerospace, automobile and 3C product (computer, communication, consumer electronics) manufacturing industries and other fields are becoming more and more widely used. In recent years, due to the increasingly urgent demand for automobile weight reduction, the low density of magnesium alloys has made it extremely attractive again in the field of transportation, and the demand for magnesium alloys has experienced a period of rapid growth. However, the relatively weak strength and plasticity of magnesium alloys and poor creep resistance at high te...
Claims
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