High-strength high-plastic rare earth magnesium alloy and preparation method thereof

A rare earth magnesium and alloy technology, applied in the field of high strength and high plastic rare earth magnesium alloy and its preparation, can solve the problems of high strength and high plasticity, and achieve the effects of balanced intragranular properties, increased energy, and increased alloy strength

Active Publication Date: 2019-06-28
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the problem that high strength and high plasticity are difficult to coordinate in the prior art, the present invention provides a high-strength and high-plastic rare earth magnesium alloy designed based on the idea of ​​multi-element and small amount and its preparation method. The preparation method adopts hierarchical heat treatment to control the microstructure, and the obtained alloy can be To meet the demand for high-strength and high-plasticity magnesium alloy materials in component manufacturing in the aerospace field

Method used

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  • High-strength high-plastic rare earth magnesium alloy and preparation method thereof
  • High-strength high-plastic rare earth magnesium alloy and preparation method thereof
  • High-strength high-plastic rare earth magnesium alloy and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Alloy composition

[0027] The alloy composition (mass fraction) is: Gd 7.22%, Y 2.14%, Nd 0.52%, Er 2.43%, Sm 0.42%, La0.34%, Ce 0.28%, Zr 0.46%; impurity elements Al≤0.02%, Cu≤ 0.02%, Fe≤0.02%, Ni≤0.02%, Si≤0.02%, and the rest is Mg.

[0028] (2) Alloy casting

[0029] After the batching is completed, place the weighed raw materials in an oven to dry for use, and the oven temperature is 120°C; when the alloy is smelted, pure magnesium and intermediate alloys Mg-Gd, Mg-Y, Mg-Nd, Mg-Er , Mg-Sm, Mg-La, and Mg-Ce are added to the crucible and heated up to melt. After the pure magnesium and the master alloy are completely melted, the temperature is raised to 800°C, and the Mg-Zr master alloy is added. After the Mg-Zr master alloy is completely melted, Refined for 10 minutes, then slag removed and left to stand, then cooled to 750°C, the alloy solution was poured into a steel mold, the steel mold was preheated to 200°C, and an inert gas was used for protection during ...

Embodiment 2

[0036] (1) Alloy composition

[0037] The alloy composition (mass fraction) is: Gd 8.42%, Y 2.84%, Nd 0.32%, Er 1.14%, Sm 0.21%, La0.12%, Ce 0.04%, Zr 0.45%; impurity elements Al≤0.02%, Cu≤ 0.02%, Fe≤0.02%, Ni≤0.02%, Si≤0.02%, and the rest is Mg.

[0038] (2) Alloy casting

[0039] After the batching is completed, place the weighed raw materials in an oven to dry for use, and the oven temperature is 120°C; when the alloy is smelted, pure magnesium and intermediate alloys Mg-Gd, Mg-Y, Mg-Nd, Mg-Er , Mg-Sm, Mg-La, and Mg-Ce are added to the crucible and heated up to melt. After the pure magnesium and the master alloy are completely melted, the temperature is raised to 800°C, and the Mg-Zr master alloy is added. After the Mg-Zr master alloy is completely melted, Refined for 10 minutes, then slag removed and left to stand, then cooled to 750°C, the alloy solution was poured into a steel mold, the steel mold was preheated to 200°C, and an inert gas was used for protection during ...

Embodiment 3

[0046] (1) Alloy composition

[0047] The alloy composition (mass fraction) is: Gd 8.35%, Y 1.24%, Nd 0.27%, Er 3.21%, Sm 0.19%, La0.11%, Ce 0.06%, Zr 0.42%; impurity elements Al≤0.02%, Cu≤ 0.02%, Fe≤0.02%, Ni≤0.02%, Si≤0.02%, and the rest is Mg.

[0048] (2) alloy casting

[0049] After the batching is completed, place the weighed raw materials in an oven to dry for use, and the oven temperature is 120°C; when the alloy is smelted, pure magnesium and intermediate alloys Mg-Gd, Mg-Y, Mg-Nd, Mg-Er , Mg-Sm, Mg-La, and Mg-Ce are added to the crucible and heated up to melt. After the pure magnesium and the master alloy are completely melted, the temperature is raised to 800°C, and the Mg-Zr master alloy is added. After the Mg-Zr master alloy is completely melted, Refined for 10 minutes, then slag removed and left to stand, then cooled to 750°C, the alloy solution was poured into a steel mold, the steel mold was preheated to 200°C, and an inert gas was used for protection during ...

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Abstract

The invention discloses high-strength high-plastic rare earth magnesium alloy and a preparation method thereof. The alloy is prepared from the following components in percentage by mass: 7-10% of Gd,0.01-3% of Y, 0.01-0.2% of Nd, 0.01-4% of Er, 0.01-1% of Sm, 0.01-1% of La, 0.01-1% of Ce, 0.3-0.7% of Zr, wherein total content of Gd, Y, Nd, Er, Sm, La and Ce is less than or equal to 15%, and totalcontent of Sm, La and Ce is less than or equal to 1.5%, less than or equal to 0.02% of impurity element Al, less than or equal to 0.05% of Cu, less than or equal to 0.05% of Fe, less than or equal to0.02% of N, less than or equal to 0.05% of Si, not more than 0.1% of total content of impurities, and the balance of Mg. The preparation method comprises alloy melting and casting, and thermal treatment. The alloy cast-T6 state prepared by the preparation method has room-temperature tensile strength exceeding 350 MPa, and has elongation not lower than 5.0%.

Description

technical field [0001] The invention relates to non-ferrous metal materials and processing, in particular to a high-strength and high-plasticity rare earth magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium alloy has the advantages of low density, high specific strength, high specific stiffness, good damping and shock absorption performance, and good electromagnetic shielding performance. It is the lightest metal structural material in current engineering applications and plays an important role in aerospace, automotive and electronics industries. application prospects. Studies in recent decades have shown that the use of rare earths as alloying elements can significantly improve the mechanical properties of alloys at room temperature and high temperature. For example, the British company Magnesium Elektron has developed WE54 and WE43 alloys containing Y and Nd elements. The WE54 alloy with higher alloy element content has a room tempe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06C22C1/03C22F1/06
Inventor 唐昌平王雪兆官立群吴凯刘文辉邓运来
Owner HUNAN UNIV OF SCI & TECH
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