CN110983137B - High-damping magnesium-lithium alloy with enhanced twin crystals in long-period stacking ordered phase and preparation method thereof - Google Patents
High-damping magnesium-lithium alloy with enhanced twin crystals in long-period stacking ordered phase and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a high-damping magnesium-lithium alloy reinforced by twin crystals in a long-period stacking ordered phase and a preparation method thereof, wherein the high-damping magnesium-lithium alloy comprises the following components in percentage by mass: 8.0% of Li, 4.0% of Y, 2.0% of Er, 2.0% of Zn, 0.6% of Zr and the balance of magnesium, and smelting: carrying out alloy smelting on the raw materials in a high-vacuum electromagnetic induction smelting furnace, and preparing cubic block as-cast alloy by furnace cooling; and (3) heat treatment: carrying out heat treatment on the alloy obtained by casting at the temperature of 450 ℃ for 6h, and cooling by adopting a furnace cooling method at the cooling speed of 0.4 ℃/min; rolling: the sample obtained by the heat treatment is subjected to cold rolling at room temperature, the total pressing amount is 50%, and the pressing amount is 25% in a single pass. The invention improves the mechanical property and the damping property of the alloy, realizes the LPSO and twin crystal synergistic improvement of the damping property and the mechanical property, and obtains the ultralight magnesium-lithium alloy material with high mechanical property and damping property.
Description
Technical Field
The invention relates to a magnesium-lithium alloy and a preparation method thereof, in particular to a high-damping magnesium-lithium alloy with enhanced twin crystals in a long-period stacking ordered phase and a preparation method thereof.
Background
With the continuous development of aerospace, transportation and 3C products, the requirements on the lightweight and vibration and noise reduction performance of alloy materials are gradually improved, and magnesium alloy becomes one of the most promising light alloy materials due to the characteristics of low density and good damping performance. The magnesium-lithium alloy is a metal structure material with the minimum density so far, and the addition of lithium element in the alloy changes the crystal structure of the alloy. The body-centered cubic structure changes the damping mechanism of the magnesium-lithium alloy, and effectively improves the processing performance of the alloy, thereby having wider application prospect. However, the practical application of the magnesium-lithium alloy is limited due to the incompatible contradiction between the strength and the damping performance of the magnesium-lithium alloy. Therefore, people begin to explore some new strengthening mechanisms from the aspects of alloy component design, advanced manufacturing and processing technology and the like, so that the new strengthening mechanisms have favorable influence on the damping and mechanical properties of the magnesium-lithium alloy.
In recent years, researches show that long-period stacking ordered phases (called LPSO for short) can be generated in some Mg-RE-Zn, and the LPSO structure has a series of advantages of high strength, high ductility and toughness, high elastic modulus, good interface combination with a magnesium matrix and the like. Many research results show that the LPSO phase not only can improve the strength of the magnesium alloy, but also can improve the plasticity of the magnesium alloy and improve the damping performance of the alloy. In addition, twin boundaries with smooth interfaces are not easy to pin, and have good mobility under the action of external loads, so that twin crystals can be considered as a new energy consumption source, and the alloy material has good damping performance. It is well known that deformation twinning is one of the main plastic deformation modes of magnesium alloys.
Disclosure of Invention
The invention aims to provide a high-damping magnesium-lithium alloy containing an LPSO structural phase and a twin crystal structure, having high damping and mechanical property and enhanced twin crystal in a long-period stacking ordered phase, and a preparation method thereof.
The purpose of the invention is realized as follows:
the high-damping magnesium-lithium alloy with the twin crystal enhanced in the long-period stacking ordered phase comprises the following chemical components in percentage by mass: 8.0% of Li, 4.0% of Y, 2.0% of Er, 2.0% of Zn, 0.6% of Zr and the balance of magnesium;
the preparation method comprises the following steps:
the method comprises the following steps: smelting: placing alloy raw materials in a crucible, vacuumizing the furnace body to below 0.1Pa, filling argon to 0.05Mpa, and cooling with the furnace by adopting a vacuum and protective gas electromagnetic induction melting method to prepare a cube-shaped cast alloy with the thickness of 100mm multiplied by 40mm multiplied by 150 mm;
step two: and (3) heat treatment: the heat treatment temperature is 450 ℃, the heat treatment time is 6 hours, and the furnace cooling method is adopted for cooling, wherein the cooling speed is 0.4 ℃/min;
step three: rolling: and (3) cold-rolling the heat-treated alloy plate to a thickness of 2mm at room temperature, wherein the total pressing amount is 50%, and the pressing amount is 25% in a single pass, so that the long-period stacking ordered phase twin crystal enhanced high-damping magnesium-lithium alloy is obtained.
A preparation method of a twin crystal enhanced high damping magnesium-lithium alloy in a long-period stacking ordered phase comprises the following steps:
the method comprises the following steps: smelting: placing alloy raw materials in a crucible, vacuumizing the furnace body to below 0.1Pa, filling argon to 0.05Mpa, and cooling with the furnace by adopting a vacuum and protective gas electromagnetic induction melting method to prepare a cube-shaped cast alloy with the thickness of 100mm multiplied by 40mm multiplied by 150 mm;
step two: and (3) heat treatment: the heat treatment temperature is 450 ℃, the heat treatment time is 6 hours, and the furnace cooling method is adopted for cooling, wherein the cooling speed is 0.4 ℃/min;
step three: rolling: and (3) cold-rolling the heat-treated alloy plate to a thickness of 2mm at room temperature, wherein the total pressing amount is 50%, and the pressing amount is 25% in a single pass, so that the long-period stacking ordered phase twin crystal enhanced high-damping magnesium-lithium alloy is obtained.
The magnesium-lithium alloy comprises the following chemical components in percentage by mass: 8.0 percent of Li, 4.0 percent of Y, 2.0 percent of Er, 2.0 percent of Zn, 0.6 percent of ZrC and the balance of magnesium.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, through the design of alloy components, a long-period stacking ordered structure is obtained in the magnesium-lithium alloy by heat treatment, and a nanometer twin crystal structure is obtained in the long-period stacking ordered structure by adopting a room temperature cold rolling technology, so that a damping value Q is obtained-1High damping magnesium-lithium alloys up to 0.02.
On the basis, the magnesium-lithium alloy is subjected to large plastic deformation by means of rolling and the like, twin crystals are introduced into a matrix or the LPSO structure, the mechanical property and the damping property of the alloy are further improved, the damping property and the mechanical property are synergistically improved by the LPSO and the twin crystals, and the ultralight magnesium-lithium alloy material with high mechanical property and damping property is obtained.
Drawings
FIG. 1 is the microstructure of the alloy after furnace cooling at 450 ℃ for 6 h;
FIGS. 2a-b are TEM images of the bulk phase after a heat treatment at 450 ℃ for 6h and the corresponding selected area electron diffraction;
FIGS. 3a-b are TEM images of the alloy after heat treatment and after 50% reduction and corresponding selected area electron diffraction;
FIG. 4 is a room temperature damping-strain curve of a heat treated and cold rolled alloy;
FIG. 5 is a room temperature stress-strain curve of a heat treated and cold rolled alloy.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The invention aims to prepare the magnesium-lithium alloy which contains LPSO structural phase and twin crystal structure and has high damping and mechanical properties; provides a preparation method of a magnesium-lithium alloy with high damping and mechanical properties for generating a twin structure in an LPSO structural phase.
The invention aims to provide a magnesium-lithium alloy with high damping and mechanical properties and a preparation method thereof. The damping performance test of the high-damping magnesium-lithium alloy is carried out on a TA-Q800 type Dynamic Mechanical Analyzer (DMA), and the damping value Q of the material-1The damping material reaches 0.02, and the preparation method is simple, has high damping performance, and has good application prospect in the fields of aviation, aerospace, traffic and the like.
The preparation method of the twin crystal enhanced high-damping magnesium-lithium alloy in the long-period stacking ordered structure phase comprises the following steps:
a. the components by mass percentage are as follows: 8.0 percent of Li, 4.0 percent of Y, 2.0 percent of Er, 2.0 percent of Zn, 0.6 percent of Zr and the balance of magnesium.
b. The alloy raw materials are placed in a crucible, vacuum pumping is carried out, the furnace body atmosphere is vacuumized to be below 0.1Pa, and argon is filled to be 0.05 MPa.
c. A vacuum and protective gas electromagnetic induction smelting method is adopted, and cube block-shaped cast alloy with the thickness of 100mm multiplied by 40mm multiplied by 150mm is prepared by furnace cooling.
d. And (3) heat treatment: the heat treatment temperature is 450 ℃, the heat treatment time is 6 hours, and the furnace cooling method is adopted for cooling, wherein the cooling speed is 0.4 ℃/min.
e. Rolling: and (3) cold-rolling the heat-treated alloy plate to the thickness of 2mm at room temperature, wherein the total pressing amount is 50%, and the pressing amount is 25% in a single pass.
f. The nano twin crystal structure obtained by adopting the rolling technology in the long-period stacking ordered structure phase is a new vibration energy consumption source.
According to the invention, through the design of alloy components, a long-period stacking ordered structure is obtained in the magnesium-lithium alloy by heat treatment, and a nanometer twin crystal structure is obtained in the long-period stacking ordered structure by adopting a room temperature cold rolling technology, so that a damping value Q is obtained-1High damping magnesium-lithium alloys up to 0.02.
Examples
The magnesium-lithium alloy in the embodiment comprises the following chemical components in percentage by mass: 8.0 percent of Li, 4.0 percent of Y, 2.0 percent of Er, 2.0 percent of Zn, 0.6 percent of Zr and the balance of magnesium. The specific process comprises the following steps:
(1) smelting: the designed components are weighed and proportioned according to mass percent, alloy smelting is carried out in a high vacuum electromagnetic induction smelting furnace, and cube block-shaped cast alloy with the thickness of 100mm multiplied by 40mm multiplied by 150mm is prepared by furnace cooling.
(2) And (3) heat treatment: and (3) carrying out heat treatment on the alloy obtained by casting at the temperature of 450 ℃ for 6h, and cooling by adopting a furnace cooling method at the cooling speed of 0.4 ℃/min.
(3) Rolling: the sample obtained by the heat treatment is subjected to cold rolling at room temperature, the total pressing amount is 50%, and the pressing amount is 25% in a single pass.
After the magnesium-lithium alloy is cooled with the furnace at 450 ℃ for 6 hours, a long-period stacking ordered structure appears in the magnesium-lithium alloy, as shown in figures 1 and 2; after the heat-treated sample is subjected to cold rolling with the room-temperature pressing amount of 50%, nano twin crystals appear in the long-period stacking ordered phase in the alloy, as shown in FIG. 3; damping Properties of the alloy after Heat treatment and the alloy after Cold Rolling are shown in FIG. 4, and damping Property Q of the alloy after Heat treatment-10.01, belonging to high damping alloy, cold rolling and post-alloyingGold damping performance Q-1The damping performance of the alloy is obviously improved when the damping performance is 0.02; FIG. 5 is a graph of the mechanical properties of the alloy after heat treatment and the alloy after cold rolling.
Claims (3)
1. The high-damping magnesium-lithium alloy with the twin crystal enhanced in the long-period stacking ordered phase is characterized by comprising the following chemical components in percentage by mass: 8.0% of Li, 4.0% of Y, 2.0% of Er, 2.0% of Zn, 0.6% of Zr and the balance of magnesium;
the preparation method comprises the following steps:
the method comprises the following steps: smelting: placing alloy raw materials in a crucible, vacuumizing the furnace body atmosphere to below 0.1Pa, filling argon to 0.05MP a, and cooling with the furnace by adopting a vacuum and protective gas electromagnetic induction melting method to prepare a cube-shaped cast alloy with the thickness of 100mm, 40mm and 150 mm;
step two: and (3) heat treatment: the heat treatment temperature is 450 ℃, the heat treatment time is 6 hours, and the furnace cooling method is adopted for cooling, wherein the cooling speed is 0.4 ℃/min;
step three: rolling: and (3) cold-rolling the heat-treated alloy plate to a thickness of 2mm at room temperature, wherein the total pressing amount is 50%, and the pressing amount is 25% in a single pass, so that the long-period stacking ordered phase twin crystal enhanced high-damping magnesium-lithium alloy is obtained.
2. A preparation method of a twin crystal enhanced high damping magnesium-lithium alloy in a long-period stacking ordered phase is characterized by comprising the following steps:
the method comprises the following steps: smelting: placing alloy raw materials in a crucible, vacuumizing the furnace body atmosphere to below 0.1Pa, filling argon to 0.05MP a, and cooling with the furnace by adopting a vacuum and protective gas electromagnetic induction melting method to prepare a cube-shaped cast alloy with the thickness of 100mm, 40mm and 150 mm;
step two: and (3) heat treatment: the heat treatment temperature is 450 ℃, the heat treatment time is 6 hours, and the furnace cooling method is adopted for cooling, wherein the cooling speed is 0.4 ℃/min;
step three: rolling: and (3) cold-rolling the heat-treated alloy plate to a thickness of 2mm at room temperature, wherein the total pressing amount is 50%, and the pressing amount is 25% in a single pass, so that the long-period stacking ordered phase twin crystal enhanced high-damping magnesium-lithium alloy is obtained.
3. The preparation method of the high-damping magnesium-lithium alloy with the twin crystal enhanced in the long-period stacking ordered phase as claimed in claim 2, wherein the magnesium-lithium alloy comprises the following chemical components in percentage by mass: 8.0 percent of Li, 4.0 percent of Y, 2.0 percent of Er, 2.0 percent of Zn, 0.6 percent of Zr and the balance of magnesium.
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| JP2008069418A (en) * | 2006-09-14 | 2008-03-27 | Kumamoto Univ | High strength magnesium alloy with excellent corrosion resistance |
| CN101857936A (en) * | 2010-07-05 | 2010-10-13 | 重庆大学 | Method for preparing magnesium alloy |
| CN103122431A (en) * | 2013-03-01 | 2013-05-29 | 哈尔滨工程大学 | Magnesium-lithium alloy with enhanced long-period structure phase and preparation method thereof |
| EP1688509B1 (en) * | 2003-11-26 | 2014-01-15 | KAWAMURA, Yoshihito | High strength and high toughness magnesium alloy and method for production thereof |
| CN107630157A (en) * | 2017-08-29 | 2018-01-26 | 西安理工大学 | A kind of preparation method of the magnesium lithium alloy of LPSO long-periodic structures enhancing |
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| CN103993213B (en) * | 2014-05-27 | 2017-11-14 | 华东交通大学 | A kind of preparation method of double special construction phase composite strengthening Mg Zn y alloys |
| CN107675053B (en) * | 2017-08-29 | 2019-09-27 | 西安理工大学 | A kind of preparation method of high strength magnesium lithium alloy and its deep cooling intensive treatment |
| CN109136704B (en) * | 2018-09-26 | 2020-11-10 | 浙江海洋大学 | High-strength single-phase (alpha-phase) magnesium-lithium alloy material and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP1688509B1 (en) * | 2003-11-26 | 2014-01-15 | KAWAMURA, Yoshihito | High strength and high toughness magnesium alloy and method for production thereof |
| JP2008069418A (en) * | 2006-09-14 | 2008-03-27 | Kumamoto Univ | High strength magnesium alloy with excellent corrosion resistance |
| CN101857936A (en) * | 2010-07-05 | 2010-10-13 | 重庆大学 | Method for preparing magnesium alloy |
| CN103122431A (en) * | 2013-03-01 | 2013-05-29 | 哈尔滨工程大学 | Magnesium-lithium alloy with enhanced long-period structure phase and preparation method thereof |
| CN107630157A (en) * | 2017-08-29 | 2018-01-26 | 西安理工大学 | A kind of preparation method of the magnesium lithium alloy of LPSO long-periodic structures enhancing |
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