Quasicrystal intermediate alloy containing Mg-Zn-Gd radical and preparation method thereof

A master alloy, mg-39wt.%gd technology, applied in the field of high-content quasi-crystal master alloy and its preparation, can solve the problems of looseness and unsuitability for the use of structural materials, and achieve an increase in the use temperature range, high corrosion resistance, and improved Effects of multiple mechanical properties

Inactive Publication Date: 2010-07-28
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Quasicrystalline materials are brittle at room temperature, and the looseness is not suitable for direct use as structural materials

Method used

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  • Quasicrystal intermediate alloy containing Mg-Zn-Gd radical and preparation method thereof
  • Quasicrystal intermediate alloy containing Mg-Zn-Gd radical and preparation method thereof
  • Quasicrystal intermediate alloy containing Mg-Zn-Gd radical and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021]I. The test raw materials are 181 grams of pure Mg (99.9wt.%) (calculated by 20% burning loss), 624 grams of pure Zn (99.99wt.%) (calculated by 20% burning loss), and Mg-39wt.% 410 grams of Gd master alloy (calculated on the basis of 30% burning loss);

[0022] II. Firstly dry the raw material ingot at 200°C, then clean the surface with a steel brush to remove surface oxides to reduce the generation of smelting impurities, and dry the smelting tools such as molds and crucibles in an oven at 200°C;

[0023] III. The smelting sequence of raw materials is Mg ingot, pure Zn, Mg-39wt.%Gd master alloy, and SF is used in the smelting process 6 +N 2 Mixed gas is used for protection to prevent oxidation and burning, and the composition of the protective gas is SF 6 (1vol.%)+N 2 (99vol.%). Put the preheated ingot into the crucible, put it into the well-type resistance furnace, and melt it under the protection of gas, and the melting temperature is 750°C;

[0024] IV. After th...

Embodiment 2

[0027] I. The test raw materials are 258 grams of pure Mg (99.9wt.%) (calculated by 20% burning loss), 512 grams of pure Zn (99.99wt.%) (calculated by 20% burning loss), and Mg-39wt.% 440 grams of Gd master alloy (calculated on the basis of 30% burning loss);

[0028] II. Firstly dry the raw material ingot at 200°C, then clean the surface with a steel brush to remove surface oxides to reduce the generation of smelting impurities, and dry the smelting tools such as molds and crucibles in an oven at 200°C;

[0029] III. The smelting sequence of raw materials is Mg ingot, pure Zn, Mg-39wt.%Gd master alloy, and SF is used in the smelting process 6 +N 2 Mixed gas is used for protection to prevent oxidation and burning, and the composition of the protective gas is SF 6 (1vol.%)+N 2 (99vol.%). Put the preheated ingot into the crucible, put it into the well-type resistance furnace, and melt it under the protection of gas, and the melting temperature is 750°C;

[0030] IV. After t...

Embodiment 3

[0033] I. The test raw materials are 78 grams of pure Mg (99.9wt.%) (calculated by 20% burning loss), 744 grams of pure Zn (99.99wt.%) (calculated by 20% burning loss), and Mg-39wt.% 390 grams of Gd master alloy (calculated on the basis of 30% burning loss);

[0034] II. First dry the raw material ingot at 200°C, and then clean the surface with a steel brush to remove surface oxides to reduce the generation of smelting impurities. Melting tools such as molds and crucibles are dried in an oven at 200°C;

[0035] III. The smelting sequence of raw materials is Mg ingot, pure Zn, Mg-39wt.%Gd master alloy, and SF is used in the smelting process 6 +N 2 Mixed gas is used for protection to prevent oxidation and burning, and the composition of the protective gas is SF 6 (1vol.%)+N 2 (99vol.%). Put the preheated ingot into the crucible, put it into the well-type resistance furnace, and melt it under the protection of gas, and the melting temperature is 740°C;

[0036] IV. After th...

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Abstract

The invention discloses a quasicrystal intermediate alloy containing Mg-Zn-Gd radical and a preparation method thereof. The alloy comprises the following chemical components in percentage by weight: 26.9-43.5% of Mg, 43.0-62.0% of Zn and 12.0-13.5% of Gd, the cast structure of the quasicrystal intermediate alloy is characterized by consisting of multi-phase compound structures of icosahedral MgaZnbGdc quasicrystal and Mg7Zn3 divorced eutectic, icosahedral MgaZnbGdc quasicrystaland MgZnGd ternary phase or icosahedral MgaZnbGdc quasicrystal and MgZn, and the volume of the quasicrystal phase can reach 40-70% of the total volumen of the master alloy. In the preparation method, a simple apparatus is utilized to obtain an intermediate alloy material of stable thermal icosahedral quasicrystal containing the Mg-Zn-Gd radical, through controlling the content of alloy elements and the casting process. The preparation process is simple and the production cost is low; the produced alloy has high content of the quasicrystal, wide range of the component, good thermal stability, heat processing performance and good market prospect, and is suitable for industrial production.

Description

technical field [0001] The invention relates to a high-content quasicrystal master alloy and a preparation method thereof. Specifically, a master alloy material containing Mg-Zn-Gd-based thermally stable icosahedral quasicrystals is prepared by using simple equipment, and belongs to the field of light alloy design and preparation . Background technique [0002] In 1984, American Shechtman (D.Shechtman) (Shechtman D, Blech I, GratiasD, et al. Metallic phase with long-range orientational order and notranslational symmetry. Phys Rev Lett, 1984, 53, 1951-1954.) etc. When people studied quenching Al-Mn alloy, they first discovered the alloy phase with 5 times rotational symmetry, which is different from the crystal and amorphous structure known before, and it is a new material form called quasi-crystal. The precise definition of a quasicrystal is a solid-state ordered phase with both long-range quasi-periodic translational order and amorphous rotational symmetry, with special sy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/06C22C18/00C22C1/03B22D21/02
Inventor 杜文博王旭东王朝辉李淑波
Owner BEIJING UNIV OF TECH
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