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A kind of cast magnesium rare earth alloy with high strength and high modulus of elasticity and preparation method thereof

A magnesium rare earth alloy, high elasticity technology, applied in the field of metal materials, can solve the problems of deteriorating alloy casting performance, reducing alloy melt fluidity, etc., and achieves the effects of improving elastic modulus, reducing crystallization range, and refining grains

Active Publication Date: 2018-05-04
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of Si also significantly reduces the fluidity of the alloy melt and deteriorates the castability of the alloy.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] This embodiment provides a cast magnesium rare earth alloy with high strength and high elastic modulus. The components and mass percentages of the cast magnesium rare earth alloy with high strength and high elastic modulus are: 11wt.%Gd, 4wt.%Y, 3wt .%Zn, 1.5wt.%Si, 0.7wt.%Zr, the total amount of impurity elements Fe, Cu and Ni is less than 0.02wt.%, and the balance is Mg (wt.% means that the components account for the prepared magnesium alloy The percentage of the total mass, the total mass is the mass sum of Mg, Zn, Si and various master alloys).

[0033] The preparation method of the magnesium alloy includes two process steps of smelting and subsequent heat treatment.

[0034] The smelting process described in SF 6 and CO 2 Under the condition of mixed gas protection, the steps are as follows:

[0035] (1) Material preparation: prepare Mg–25wt.% Gd master alloy containing 11wt.% Gd total weight of the prepared alloy, Mg–25wt.% Y master alloy containing 4wt.% Y, Mg...

Embodiment 2

[0046] This embodiment provides a cast magnesium rare earth alloy with high strength and high elastic modulus. The components and mass percentages of the cast magnesium rare earth alloy with high strength and high elastic modulus are: 14wt.%Gd, 2wt.%Y, 5wt .% Zn, 2.5wt.% Si, 1wt.% Zr, the total amount of impurity elements Fe, Cu and Ni is less than 0.02wt.%, and the balance is Mg.

[0047] The preparation method of the magnesium alloy includes two process steps of smelting and subsequent heat treatment.

[0048] The smelting process described in SF 6 and CO 2 Under the condition of mixed gas protection, the steps are as follows:

[0049] (1) Material preparation: Prepare Mg-30wt.% Gd master alloy containing 14wt.% Gd total weight of the formulated alloy, Mg-20wt.% Y master alloy containing 2wt.% Y, Mg-30wt. containing 1wt.% Zr. %Zr master alloy, containing 2.5wt.% pure Si, 5wt.% pure Zn, and the balance is pure Mg;

[0050] (2) Baking material: Preheat pure Mg, pure Zn, pu...

Embodiment 3

[0060] This embodiment provides a cast magnesium rare earth alloy with high strength and high elastic modulus. The components and mass percentages of the cast magnesium rare earth alloy with high strength and high elastic modulus are: 8wt.%Gd, 6wt.%Y, 1wt .%Zn, 0.5wt.%Si, 0.4wt.%Zr, the total amount of impurity elements Fe, Cu and Ni is less than 0.02wt.%, and the balance is Mg (wt.% means that the composition accounts for the prepared magnesium alloy The percentage of the total mass, the total mass is the mass sum of Mg, Zn, Si and various master alloys).

[0061] The preparation method of the magnesium rare earth alloy includes two process steps of smelting and subsequent heat treatment.

[0062] The smelting process described in SF 6 and CO 2 Under the condition of mixed gas protection, the steps are as follows:

[0063] (1) material preparation: prepare the Mg-Gd master alloy (Gd content is 20wt.%) containing the total weight of the prepared alloy 8wt.%Gd, the Mg-Y mast...

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Abstract

The invention discloses a cast magnesium rare earth alloy with high strength and high elastic modulus and a preparation method thereof. The cast magnesium rare earth alloy comprises the following components in mass percentage: 8-14wt.%Gd, 2-6wt.%Y, 1-5wt.% Zn, 0.5-2.5wt.% Si, 0.4-1wt.% Zr, the total amount of impurity elements Fe, Cu and Ni is less than 0.02wt.%, and the balance is Mg; the preparation method includes smelting, heat treatment. In the invention, Si is added to react with Mg and RE elements in the magnesium alloy to generate a Si-containing phase with high elastic modulus, and at the same time, Zn is added to react with Mg and RE elements in the magnesium alloy to generate a stable eutectic phase, reducing alloy melting. The crystallization range of the body is improved, and the melt fluidity is improved, and then through the corresponding heat treatment process, the alloy has higher room temperature strength and elastic modulus.

Description

technical field [0001] The invention relates to a magnesium alloy and a preparation method thereof, in particular to a cast magnesium rare earth alloy with high strength and high elastic modulus and a preparation method thereof, belonging to the technical field of metal materials. Background technique [0002] When the elastic deformation of a metal material fully satisfies Hooke's law, the ratio of its stress to strain is the modulus of elasticity. The elastic modulus is essentially a physical parameter that characterizes the bonding strength between solid atoms. The smaller the atomic radius and ionic radius, the higher the atomic valence, the greater the elastic modulus. For selected materials, the elastic modulus is tissue insensitive. [0003] Due to the advantages of low density, high specific strength and specific stiffness, magnesium alloy has been widely used in fields such as aerospace, military industry, and automobiles. In recent years, the speed of aerospace a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/06C22C1/03C22F1/06
Inventor 刘文才吴国华张亮丁文江
Owner SHANGHAI JIAO TONG UNIV
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