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Boron-containing high-modulus magnesium alloy and preparation method thereof

A high-modulus, magnesium alloy technology, applied in the field of magnesium alloys, can solve the problems of poor bonding force between reinforced particles and magnesium matrix, poor surface quality, limited application scope, etc. The effect of improving mechanical properties

Active Publication Date: 2019-07-23
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the preparation of composite materials by adding high-modulus reinforcing phases is a common method to increase the elastic modulus of alloys, the bonding force between the added reinforcing particles and the magnesium matrix is ​​often poor, and the surface quality after cutting is often poor, which greatly limits range of applications

Method used

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  • Boron-containing high-modulus magnesium alloy and preparation method thereof
  • Boron-containing high-modulus magnesium alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Alloy composition

[0022] The alloy composition (mass fraction) is: Gd 7.46%, Y 2.86%, Nd 0.94%, La 0.46%, B 1.52%, Zr 0.38%; impurity elements Al≤0.02%, Cu≤0.02%, Fe≤0.02%, Ni ≤0.02%, Si≤0.02%, and the rest is Mg.

[0023] (2) Alloy casting

[0024] After the batching is completed, the weighed raw materials are placed in an oven for drying and the temperature of the oven is 120°C; when the alloy is smelted, the pure magnesium and the intermediate alloys Mg-Gd, Mg-Y, Mg-Nd, Mg-La Put it into the crucible and heat up to melt. After the pure magnesium and the master alloy are completely melted, add magnesium rods containing boron powder, raise the temperature to 800°C, add the Mg-Zr master alloy, and refine for 10 minutes after the Mg-Zr master alloy is completely melted, then After removing the slag, let it stand still, then lower the temperature to 750°C, pour the alloy liquid into a steel mold preheated to 200°C, and use inert gas to protect it during the entire...

Embodiment 2

[0031] (1) Alloy composition

[0032] The alloy composition (mass fraction) is: Gd 9.63%, Y 1.58%, Nd 1.18%, La 0.89%, B 1.82%, Zr 0.63%; impurity elements Al≤0.02%, Cu≤0.02%, Fe≤0.02%, Ni ≤0.02%, Si≤0.02%, and the rest is Mg.

[0033] (2) Alloy casting

[0034] After the batching is completed, the weighed raw materials are placed in an oven for drying and the temperature of the oven is 120°C; when the alloy is smelted, the pure magnesium and the intermediate alloys Mg-Gd, Mg-Y, Mg-Nd, Mg-La Put it into the crucible and heat up to melt. After the pure magnesium and the master alloy are completely melted, add boron-containing powdered magnesium rods, raise the temperature to 800°C, add the Mg-Zr master alloy, and refine for 10 minutes after the Mg-Zr master alloy is completely melted, then After removing the slag, let it stand still, then lower the temperature to 750°C, pour the alloy liquid into a steel mold preheated to 200°C, and use inert gas to protect it during the enti...

Embodiment 3

[0041] (1) Alloy composition

[0042] The alloy composition (mass fraction) is: Gd 9.72%, Y 2.86%, Nd 1.12%, La 0.54%, B 1.07%, Zr 0.51%; impurity elements Al≤0.02%, Cu≤0.02%, Fe≤0.02%, Ni ≤0.02%, Si≤0.02%, and the rest is Mg.

[0043] (2) Alloy casting

[0044] After the batching is completed, the weighed raw materials are placed in an oven for drying and the temperature of the oven is 120°C; when the alloy is smelted, the pure magnesium and the intermediate alloys Mg-Gd, Mg-Y, Mg-Nd, Mg-La Put it into the crucible and heat up to melt. After the pure magnesium and the master alloy are completely melted, add boron-containing powdered magnesium rods, raise the temperature to 800°C, add the Mg-Zr master alloy, and refine for 10 minutes after the Mg-Zr master alloy is completely melted, then After removing the slag, let it stand still, then lower the temperature to 750°C, pour the alloy liquid into the steel mold, and the steel mold is preheated to 200°C in advance. Inert gas ...

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Abstract

The invention discloses a boron-containing high-modulus magnesium alloy and a preparation method thereof. The alloy comprises the following components of, by mass, 5.0% to 10.0% of Gd, 0.01% to 3.0% of Y, 0.01% to 1.2% of Nd, 0.01% to 2.0% of B, 0.01% to 1.0% of La, 0.3% to 0.7% of Zr, impurities with the total content less than or equal to 0.1% and the balance Mg, wherein the total content of therare earth elements of Gd, Y, Nd and La is less than or equal to 15.0%, the impurity elements comprises less than or equal to 0.02% of Al, less than or equal to 0.05% of Cu, less than or equal to 0.05% of Fe, less than or equal to 0.02% of Ni and less than or equal to 0.05% of Si. preparation method comprises two parts of alloy casting and heat treatment. The alloy prepared by adopting the preparation method has the advantages that the casting-T6 state room-temperature tensile strength is more than 350 MPa, the elastic modulus is more than 50 GPa, the elongation after fracture is not lower than 3.0%, and the comprehensive performance is obviously superior to that of a general magnesium alloy material.

Description

technical field [0001] The invention relates to a magnesium alloy, in particular to a boron-containing high-modulus magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium alloy has the advantages of low density, high specific strength, good damping and shock absorption performance, and good electromagnetic shielding performance, and has broad application prospects in the aerospace field. However, for commonly used magnesium alloys, the elastic modulus is low, about 40-45GPa, resulting in low component stiffness. As the new generation of missiles has increasingly stringent requirements for strike accuracy, the performance requirements for materials used in manufacturing components are also getting higher and higher. Although the preparation of composite materials by adding high-modulus reinforcing phases is a common method to increase the elastic modulus of alloys, the bonding force between the added reinforcing particles and the magnesium ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06C22C1/03C22F1/06
CPCC22C1/03C22C23/06C22F1/06
Inventor 唐昌平吴凯刘文辉王雪兆张超邓运来
Owner HUNAN UNIV OF SCI & TECH
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