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High-strength and high-elastic-modulus magnesium lithium base composite material and preparation method thereof

A technology of composite materials and high elasticity, applied in the field of metal materials, can solve the problems of plasticity and toughness loss, reduce the specific strength of Mg-Li-based composite materials, affect the performance of composite materials, etc., achieve simple processing technology, improve mechanical properties and The effect of thermal stability

Active Publication Date: 2017-07-14
苏州轻金三维科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it improves the mechanical properties of the alloy to varying degrees, there are still some problems, such as: the addition of stainless steel wire greatly reduces the specific strength of the Mg-Li matrix composite due to its density; The Li alloy matrix suffered severe damage due to excessive interfacial reaction, which greatly affected the properties of the composite material; although the addition of boron particles can greatly improve the compressive properties of the material, it has no significant effect on the improvement of its tensile properties; while the ceramic The wettability and thermal matching between phase and Mg-Li alloy matrix are poor, and its own brittleness will bring serious loss of plasticity and toughness to the material, and its comprehensive strengthening effect is not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The matrix components and mass percentages of high-strength and high-elastic-modulus magnesium-lithium-based composite materials are: 11wt% Li, 1wt% Zn, 0.5wt% Gd, 0wt% Si, and Mg is 87.5wt% (wt% refers to the composition % of the total mass of the prepared alloy). Then take the magnesium-lithium alloy Mg-11Li-1Zn-0.5Gd as the matrix, and add 1wt% Al 2 Ca or Al 2 Y, Al 2 Ca or Al 2 The particle diameter of Y was 5 μm.

[0059] The preparation method of the high-strength and high-elastic-modulus magnesium-lithium-based composite material is as follows:

[0060] First, the smelting process is carried out, and the entire smelting process is carried out in SF 6 and CO 2 Carried out under the protection condition of mixed gas, specifically: Weigh pure Mg, pure Zn, Mg-Gd master alloy, Mg-Si master alloy and Li rod respectively, and weigh lithium salt flux, lithium salt The flux is made by mixing LiCl and LiF with a mass ratio of 2:1. Then, preheat all the above-mentio...

Embodiment 2

[0065] The matrix components and mass percentages of high-strength and high-elastic-modulus magnesium-lithium-based composites are: 16wt% Li, 5wt% Zn, 2.5wt% Gd, 1wt% Si, and 75.5wt% Mg (wt% refers to the composition % of the total mass of the prepared alloy). Then take the magnesium-lithium alloy Mg-16Li-5Zn-2.5Gd-1Si as the matrix, and add 10wt% Al 2 Ca or Al 2 Y, Al 2 Ca or Al 2 The particle diameter of Y was 40 μm.

[0066] The preparation method of the high-strength and high-elastic-modulus magnesium-lithium-based composite material is as follows:

[0067] First, the smelting process is carried out, and the entire smelting process is carried out in SF 6 and CO 2 Carried out under the protection condition of mixed gas, specifically: Weigh pure Mg, pure Zn, Mg-Gd master alloy, Mg-Si master alloy and Li rod respectively, and weigh lithium salt flux, lithium salt The flux is made by mixing LiCl and LiF with a mass ratio of 2:1. Then, preheat all the above-mentioned ra...

Embodiment 3

[0072] The matrix components and mass percentages of high-strength and high-elastic-modulus magnesium-lithium-based composite materials are: 13.5wt% Li, 3wt% Zn, 1.5wt% Gd, 0.5wt% Si, and 81.5wt% Mg (wt% refers to Components account for the percentage of the total mass of the prepared alloy). Then take the magnesium-lithium alloy Mg-13.5Li-3Zn-1.5Gd-0.5Si as the matrix, and add 5.5wt% Al 2 Ca or Al 2 Y, Al 2 Ca or Al 2 The particle diameter of Y was 22.5 μm.

[0073] The preparation method of the high-strength and high-elastic-modulus magnesium-lithium-based composite material is as follows:

[0074] First, the smelting process is carried out, and the entire smelting process is carried out in SF 6 and CO 2 Carried out under the protection condition of mixed gas, specifically: Weigh pure Mg, pure Zn, Mg-Gd master alloy, Mg-Si master alloy and Li rod respectively, and weigh lithium salt flux, lithium salt The flux is made by mixing LiCl and LiF with a mass ratio of 2:1. ...

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Abstract

The invention discloses a high-strength and high-elastic-modulus magnesium lithium base composite material and a preparation method thereof. A magnesium lithium alloy comprises the following basal body components in percentage by mass: 11-16 wt% of Li, 1-5 wt% of Zn, 0.5-2.5 wt% of Gd, 0-1 wt% of Si, and the balance of Mg. The magnesium lithium alloy Mg-Li-Zn-Gd-Si is used a parent body, and is added with 1-10 wt% of Al2Ca or Al2Y. The preparation method of the high-strength and high-elastic-modulus magnesium lithium base composite material comprises two processes of smelting and plastic deformation, wherein the smelting process comprises the steps of: baking, Mg and Si melting, Zn and Gd adding, Li adding, reinforced particle adding, and casting; and the plastic deformation process comprises homogenization and plastic deformation. Zn and Gd are synchronously added in a magnesium lithium alloy solidification structure to form a quasi-crystal reinforcing phase, and Si is added to form a heat-resistance second phase, so that the heat stability of the alloy is improved; and meanwhile, the reinforced particles are introduced in the basal body of the magnesium lithium alloy to form the composite material, so that the strength and the rigidity are comprehensively improved, the material density is guaranteed to be lower than 1.55 g / cm3, and the ultralight high-performance magnesium lithium base composite material is obtained.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and in particular relates to a magnesium-lithium-based composite material in the technical field of composite materials and a preparation method thereof, especially a high-strength and high-elastic-modulus magnesium-lithium-based composite material and a preparation method thereof. Background technique [0002] Mg-Li alloy as the lightest metal structure material (1.30~1.65g / cm 3 ), because of its high specific strength, high specific stiffness, excellent plasticity, shock absorption performance, cutting performance and good resistance to high-energy particle penetration, it is very widely used in aviation, aerospace, automobiles, electronics and modern weapons. potential. [0003] According to the Mg-Li binary phase diagram, when the Li content is below 5.7wt%, the alloy is α -Mg (solid solution of Li in Mg) single-phase structure; when the content of Li exceeds 10.3wt%, the alloy is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00C22C1/03
CPCC22C1/03C22C23/00
Inventor 刘文才李俊锋
Owner 苏州轻金三维科技有限公司
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