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A kind of high strength toughness high modulus sand mold gravity casting magnesium alloy and preparation method thereof

A gravity casting, magnesium alloy technology, applied in casting molding equipment, metal processing equipment, cores and other directions, can solve the problem of reducing the strength and toughness of magnesium alloys, and achieve the improvement of the elastic modulus, the preparation method is simple, and the elastic modulus of the alloy is improved. Effect

Active Publication Date: 2021-03-19
SHANGHAI JIAOTONG UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, although the introduction of high-modulus reinforcing phases can effectively increase the modulus of magnesium alloys, the high-modulus reinforcing phases generated in situ by alloying, such as Al 3 Li, Mg 2 Si, Al 2 Ca, etc. belong to brittle phases, which will become crack initiation points distributed in grain boundaries, reducing the strength and toughness of magnesium alloys, especially the plasticity.

Method used

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  • A kind of high strength toughness high modulus sand mold gravity casting magnesium alloy and preparation method thereof
  • A kind of high strength toughness high modulus sand mold gravity casting magnesium alloy and preparation method thereof
  • A kind of high strength toughness high modulus sand mold gravity casting magnesium alloy and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0047] Alloy composition (mass percentage) of sand gravity casting magnesium alloy: 3.50% Al, 1.72% Ce, 0.87% La, 0.91% Pr, 1.04% Sm, 0.03% Tb, 0.04% Er, 0.50% Si, 0.20% Mn, others Unavoidable impurities are less than 0.2%, and the rest is Mg.

[0048] The present embodiment relates to the smelting method of conventional rare earth magnesium alloy and the alloy sand mold gravity casting method in the present invention:

[0049] Among them, the smelting process is in SF 6 and CO 2 Under the condition of mixed gas protection, the steps are as follows:

[0050] (1) Baking material: Preheat the smelting raw material at 200°C for 3 hours;

[0051] (2) Molten magnesium: Put the dried pure magnesium into the SF 6 / CO 2 Melting in a gas shielded crucible resistance furnace;

[0052] (3) Adding pure aluminum and magnesium-manganese master alloy: when the pure magnesium is completely melted and the temperature reaches 670°C, add the preheated pure aluminum and magnesium-manganese ...

Embodiment 2

[0059] Alloy composition (mass percentage) of high strength, toughness and high modulus sand gravity casting magnesium alloy: 4.12% Al, 0.50% Ce, 1.06% Sm, 1.36% Gd, 0.03% Eu, 0.01% Dy, 0.02% Ho, 0.01% Tm, 0.01% Lu, 0.50% Si, 0.01% Mn, other unavoidable impurities are less than 0.2%, and the rest is Mg.

[0060] The present embodiment relates to the smelting method of conventional rare earth magnesium alloy and the alloy sand mold gravity casting method in the present invention:

[0061] Among them, the smelting process is in SF 6 and CO 2 Under the condition of mixed gas protection, the steps are as follows:

[0062] (1) Baking material: Preheat the smelting raw material at 250°C for 2 hours;

[0063] (2) Molten magnesium: Put the dried pure magnesium into the SF 6 / CO 2 Melting in a gas shielded crucible resistance furnace;

[0064] (3) Add pure aluminum and magnesium-manganese master alloy: when the pure magnesium is completely melted and the temperature reaches 680°C...

Embodiment 3

[0071] Alloy composition (mass percentage) of high strength, toughness and high modulus sand gravity casting magnesium alloy: 5.67% Al, 2.20% Ce, 1.13% La, 1.17% Pr, 0.01% Yb, 5.00% Si, 0.41% Mn, other unavoidable Impurities are less than 0.2%, and the rest is Mg.

[0072] The present embodiment relates to the smelting method of conventional rare earth magnesium alloy and the alloy sand mold gravity casting method in the present invention:

[0073] Among them, the smelting process is in SF 6 and CO 2 Under the condition of mixed gas protection, the steps are as follows:

[0074] (1) Baking material: Preheat the smelting raw material at 250°C for 2 hours;

[0075] (2) Molten magnesium: Put the dried pure magnesium into the SF 6 / CO 2 Melting in a gas shielded crucible resistance furnace;

[0076] (3) Add pure aluminum and magnesium-manganese master alloy: when the pure magnesium is completely melted and the temperature reaches 680°C, add the preheated pure aluminum and ma...

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PUM

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Abstract

The invention discloses high-strength high-toughness high-modulus sand mold gravity cast magnesium alloy and a parathion method thereof. The high-strength high-toughness high-modulus sand mold gravitycast magnesium alloy comprises the following elements of, by mass, a% of Al, b% of one or a mixture of two or all of La, Ce and Pr, c% of Mn, d% of one or more of rare elements including Gd, Y, Sm, Nd, Er, Eu, Ho, Tm, Lu, Dy and Yb, e% of one or more of Si, Ge, Ca, Li, Sn, Zn and Sb, less than 0.2% of impurities and the balance Mg, wherein a is larger than or equal to 3.5 and smaller than or equal to 6.5, b is larger than or equal to 0.5 and smaller than or equal to 4.5, c is larger than or equal to 0.01 and smaller than or equal to 1.5, d is larger than or equal to 0.01 and smaller than or equal to 2.5, and e is larger than 0 and smaller than or equal to 5.0. Raw materials are subjected to preheating, melting, pouring, and sand mold gravity casting to form a magnesium alloy casting piece, the method is simple, and the technology is good in stability and high in controllability.

Description

technical field [0001] The invention belongs to the field of non-ferrous metal materials and their processing, and in particular relates to a high-strength, high-toughness, high-modulus sand-type gravity casting magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium and its alloys are the lightest metal structural materials currently available in industry, with low density (about 2 / 3 of aluminum and 1 / 4 of steel), high specific strength and specific stiffness, damping, and machinability , Casting performance and other advantages, has been widely used in automotive, communication electronics, aerospace, military and other fields. In recent years, with the rapid development of aerospace and transportation tools, the power required for operation is increasing, so higher requirements are placed on the strength, toughness and elastic strain resistance of material components. However, the lower absolute strength, plasticity and elastic modulus o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/02C22C1/03C22C1/06B22C9/02C22F1/06
CPCB22C9/02C22C1/03C22C1/06C22C23/02C22F1/06
Inventor 魏杰王渠东
Owner SHANGHAI JIAOTONG UNIV