CN111020325A - Corrosion-resistant magnesium-lithium alloy - Google Patents
Corrosion-resistant magnesium-lithium alloy Download PDFInfo
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- CN111020325A CN111020325A CN201911308707.8A CN201911308707A CN111020325A CN 111020325 A CN111020325 A CN 111020325A CN 201911308707 A CN201911308707 A CN 201911308707A CN 111020325 A CN111020325 A CN 111020325A
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- lithium alloy
- magnesium
- corrosion
- alloy
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- 229910000733 Li alloy Inorganic materials 0.000 title claims abstract description 68
- 239000001989 lithium alloy Substances 0.000 title claims abstract description 68
- GCICAPWZNUIIDV-UHFFFAOYSA-N lithium magnesium Chemical compound [Li].[Mg] GCICAPWZNUIIDV-UHFFFAOYSA-N 0.000 title claims abstract description 68
- 238000005260 corrosion Methods 0.000 title claims abstract description 42
- 230000007797 corrosion Effects 0.000 title claims abstract description 42
- 229910052684 Cerium Inorganic materials 0.000 claims abstract description 7
- 229910052779 Neodymium Inorganic materials 0.000 claims abstract description 7
- 229910052746 lanthanum Inorganic materials 0.000 claims abstract description 6
- 239000000956 alloy Substances 0.000 claims description 27
- 229910045601 alloy Inorganic materials 0.000 claims description 27
- 229910052744 lithium Inorganic materials 0.000 claims description 17
- 239000011777 magnesium Substances 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 10
- 239000000243 solution Substances 0.000 claims description 10
- 238000000137 annealing Methods 0.000 claims description 7
- 238000002360 preparation method Methods 0.000 claims description 6
- 238000003723 Smelting Methods 0.000 claims description 5
- 239000011261 inert gas Substances 0.000 claims description 5
- 239000006104 solid solution Substances 0.000 claims description 5
- 229910052726 zirconium Inorganic materials 0.000 claims description 3
- 229910052761 rare earth metal Inorganic materials 0.000 abstract 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 12
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 5
- 229910052749 magnesium Inorganic materials 0.000 description 5
- 239000013078 crystal Substances 0.000 description 4
- 229910000861 Mg alloy Inorganic materials 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000005501 phase interface Effects 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses a corrosion-resistant magnesium-lithium alloy which comprises the following components in percentage by weight: 8.1-11.9% of Li, 1.3-2.4% of Zr, 0.1-0.9% of Ce, 0.3-0.9% of Nd, 0.9-1.5% of La and the balance of Mg. According to the invention, three rare earth elements, namely Ce, Nd and La, are added into the magnesium-lithium alloy, so that the mechanical property of the magnesium-lithium alloy is ensured, and the corrosion resistance of the magnesium-lithium alloy is improved.
Description
Technical Field
The invention belongs to the technical field of metal materials, and particularly relates to a corrosion-resistant magnesium-lithium alloy.
Background
The alloy obtained by taking magnesium and lithium as main alloy elements and adding other alloying elements on the basis is called magnesium-lithium alloy, and the density of the alloy is generally 1.35-1.65 g/cm3The density is 1/5 of steel and 1/2 of aluminum alloy, which are true, the density of magnesium-lithium alloy can be even lower than 1.0g/cm when the lithium content is higher3Gold known as being able to float on waterBelongs to the field of medicine.
The magnesium-lithium alloy material has excellent mechanical properties of low density, high specific stiffness and high specific strength by adding metallic lithium into magnesium, the structure of the magnesium-lithium alloy also changes remarkably with the change of lithium content, when the lithium content is lower than 5.7%, the alloy is α (Mg) single-phase structure, the crystal structure is a close-packed hexagonal structure (HCP), when the lithium content is higher than 10.3%, the alloy is β (Li) single-phase structure, the crystal structure is a body-centered cubic structure (BCC), and when the lithium content is 5.7-10.3%, the alloy is α (Mg) + β (Li) double-phase structure.
Besides the ultra-light characteristics, the magnesium-lithium alloy also has the following characteristics:
(1) because the addition of lithium can reduce the c/a axial ratio of magnesium lattice and improve the symmetry of close-packed hexagonal lattice on one hand, and β (Li) of body-centered cubic lattice appears when the lithium content is higher on the other hand, the plastic deformation capability of the magnesium-lithium alloy is obviously better than that of the common magnesium alloy;
(2) high specific strength and specific stiffness;
(3) the penetration resistance of high-energy particles is strong, and the electromagnetic shielding performance is excellent;
(4) the low-temperature mechanical property is good;
(5) the cutting processing performance is good.
However, since magnesium and lithium are both active metals and are in a two-phase structure, corrosion is very likely to occur at the phase interface in the use environment to generate a galvanic cell, so that magnesium and lithium are constantly dissolved at the anode and H is present at the cathode2And precipitating to accelerate the corrosion of the alloy.
The magnesium-lithium alloy has poor corrosion resistance and can be seriously corroded when placed in normal temperature atmosphere. Furthermore, magnesium lithium alloys are very susceptible to stress corrosion cracking in humid atmospheres. The influence of alloying elements on the corrosion resistance of magnesium-lithium alloys is related to the lithium content.
Disclosure of Invention
The invention provides a corrosion-resistant magnesium-lithium alloy which has good corrosion resistance while ensuring good mechanical properties.
In order to achieve the technical purpose, the invention adopts the following technical scheme.
A corrosion resistant magnesium lithium alloy comprising the following components in weight percent: 8.1-11.9% of Li, 1.3-2.4% of Zr, 0.1-0.9% of Ce, 0.3-0.9% of Nd, 0.9-1.5% of La and the balance of Mg.
Further, the alloy comprises the following components in percentage by weight: 9.3 to 10.8 percent of Li, 1.6 to 2.4 percent of Zr, 0.3 to 0.8 percent of Ce, 0.4 to 0.6 percent of Nd, 0.9 to 1.5 percent of La and the balance of Mg.
Further, the alloy comprises the following components in percentage by weight: 9.3-10.8% of Li, 1.6-2.4% of Zr, 0.3-0.8% of Ce, 0.5% of Nd, 1.0% of La and the balance of Mg.
The preparation method of the corrosion-resistant magnesium-lithium alloy comprises the following steps:
(1) preparing raw materials according to the weight percentage of each component in the corrosion-resistant magnesium-lithium alloy;
(2) vacuum smelting is carried out on the prepared raw materials to obtain alloy melt, and then the alloy melt is cast into a mould to be cooled to obtain as-cast magnesium-lithium alloy;
(3) and (3) sequentially carrying out solid solution treatment and stress relief annealing on the as-cast magnesium-lithium alloy obtained in the step (2) to finally obtain the corrosion-resistant magnesium-lithium alloy.
Further, the cooling mode in the step (2) is furnace cooling.
Further, the specific contents of the solution treatment are as follows: heating the as-cast magnesium-lithium alloy to 643-667K, wherein inert gas is required to be used for protection in the heating process, then preserving heat for 5-11 hours, and then rapidly cooling in an organic medium.
Further, the specific content of the stress relief annealing is as follows: and heating the magnesium-lithium alloy subjected to the solution treatment to 527-553K, preserving the heat for 1-2 h, and cooling along with the furnace.
The invention has the beneficial effects that Ce is added into the magnesium-lithium alloy, and the alloy grains can be obviously refined, the refining effect of the Ce in the magnesium alloy is that the composition is supercooled due to the enrichment of the front edge of a solid/liquid interface in the solidification process of the Ce, and a new nucleation zone is formed in the supercooled zone to form fine isometric crystals;
the alloy is added with Nd, and the addition of Nd can obviously refine and improve the form and distribution of α -Mg crystal grains, thereby obviously reducing the corrosion rate of the magnesium-lithium alloy, improving the equilibrium potential and corrosion potential of the magnesium-lithium alloy, reducing corrosion current and improving the corrosion resistance of the magnesium-lithium alloy;
la is added into the alloy, the weight loss corrosion rate of the alloy can be obviously reduced, and the La can form a net-like β phase structure in the magnesium-lithium alloy, so that a relatively effective corrosion-resistant film is formed on the surface of the alloy in the corrosion process, and the corrosion resistance of the magnesium-lithium alloy is greatly improved.
Detailed Description
Example 1
A corrosion resistant magnesium lithium alloy comprising the following components in weight percent: 9.3 percent of Li, 1.6 percent of ZrC, 0.8 percent of Ce, 0.6 percent of Nd, 0.9 percent of La and the balance of Mg.
The preparation method of the corrosion-resistant magnesium-lithium alloy comprises the following steps:
(1) preparing raw materials according to the weight percentage of each component in the corrosion-resistant magnesium-lithium alloy;
(2) vacuum smelting is carried out on the prepared raw materials to obtain alloy melt, and then the alloy melt is cast into a mould to be cooled along with a furnace to obtain as-cast magnesium-lithium alloy;
(3) sequentially carrying out solid solution treatment on the as-cast magnesium-lithium alloy obtained in the step (2), wherein the specific process comprises the following steps: heating the as-cast magnesium-lithium alloy to 650K, wherein inert gas is required to be used for protection in the heating process, then preserving heat for 6 hours, and then rapidly cooling in an organic medium;
(4) then, carrying out stress relief annealing on the magnesium-lithium alloy subjected to the solution treatment, wherein the specific process comprises the following steps: and heating the magnesium-lithium alloy subjected to the solution treatment to 530K, preserving the heat for 1h, and cooling along with the furnace.
Example 2
A corrosion resistant magnesium lithium alloy comprising the following components in weight percent: 9.4 percent of Li, 2.0 percent of ZrC, 0.7 percent of Ce, 0.5 percent of Nd, 1.0 percent of La and the balance of Mg.
The preparation method of the corrosion-resistant magnesium-lithium alloy comprises the following steps:
(1) preparing raw materials according to the weight percentage of each component in the corrosion-resistant magnesium-lithium alloy;
(2) vacuum smelting is carried out on the prepared raw materials to obtain alloy melt, and then the alloy melt is cast into a mould to be cooled along with a furnace to obtain as-cast magnesium-lithium alloy;
(3) sequentially carrying out solid solution treatment on the as-cast magnesium-lithium alloy obtained in the step (2), wherein the specific process comprises the following steps: heating the as-cast magnesium-lithium alloy to 650K, wherein inert gas is required to be used for protection in the heating process, then preserving heat for 6 hours, and then rapidly cooling in an organic medium;
(4) then, carrying out stress relief annealing on the magnesium-lithium alloy subjected to the solution treatment, wherein the specific process comprises the following steps: and heating the magnesium-lithium alloy subjected to the solution treatment to 530K, preserving the heat for 1h, and cooling along with the furnace.
Example 3
A corrosion resistant magnesium lithium alloy comprising the following components in weight percent: 10.9 percent of Li, 2.1 percent of ZrC, 0.8 percent of Ce, 0.5 percent of Nd, 1.1 percent of La and the balance of Mg.
The preparation method of the corrosion-resistant magnesium-lithium alloy comprises the following steps:
(1) preparing raw materials according to the weight percentage of each component in the corrosion-resistant magnesium-lithium alloy;
(2) vacuum smelting is carried out on the prepared raw materials to obtain alloy melt, and then the alloy melt is cast into a mould to be cooled along with a furnace to obtain as-cast magnesium-lithium alloy;
(3) sequentially carrying out solid solution treatment on the as-cast magnesium-lithium alloy obtained in the step (2), wherein the specific process comprises the following steps: heating the as-cast magnesium-lithium alloy to 650K, wherein inert gas is required to be used for protection in the heating process, then preserving heat for 6 hours, and then rapidly cooling in an organic medium;
(4) then, carrying out stress relief annealing on the magnesium-lithium alloy subjected to the solution treatment, wherein the specific process comprises the following steps: and heating the magnesium-lithium alloy subjected to the solution treatment to 530K, preserving the heat for 1h, and cooling along with the furnace.
Claims (7)
1. A corrosion resistant magnesium lithium alloy, wherein the alloy comprises the following components in weight percent: li8.1-11.9%, Zr 1.3-2.4%, Ce 0.1-0.9%, Nd 0.3-0.9%, La 0.9-1.5%, and the balance Mg.
2. The corrosion-resistant magnesium-lithium alloy according to claim 1, wherein said alloy comprises the following components in weight percent: 9.3 to 10.8 percent of Li, 1.6 to 2.4 percent of Zr, 0.3 to 0.8 percent of Ce, 0.4 to 0.6 percent of Nd, 0.9 to 1.5 percent of La0, and the balance of Mg.
3. The corrosion-resistant magnesium-lithium alloy according to claim 1, wherein said alloy comprises the following components in weight percent: 9.3-10.8% of Li, 1.6-2.4% of Zr, 0.3-0.8% of Ce, 0.5% of Nd, 1.0% of La and the balance of Mg.
4. The method for preparing the corrosion-resistant magnesium-lithium alloy according to any one of claims 1 to 3, which is characterized by comprising the following steps:
(1) preparing raw materials according to the weight percentage of each component in the corrosion-resistant magnesium-lithium alloy;
(2) vacuum smelting is carried out on the prepared raw materials to obtain alloy melt, and then the alloy melt is cast into a mould to be cooled to obtain as-cast magnesium-lithium alloy;
(3) and (3) sequentially carrying out solid solution treatment and stress relief annealing on the as-cast magnesium-lithium alloy obtained in the step (2) to finally obtain the corrosion-resistant magnesium-lithium alloy.
5. The method for preparing the corrosion-resistant magnesium-lithium alloy according to claim 4, wherein the cooling manner in the step (2) is furnace cooling.
6. The preparation method of the corrosion-resistant magnesium-lithium alloy according to claim 4, wherein the solution treatment specifically comprises: heating the as-cast magnesium-lithium alloy to 643-667K, wherein inert gas is required to be used for protection in the heating process, then preserving heat for 5-11 hours, and then rapidly cooling in an organic medium.
7. The preparation method of the corrosion-resistant magnesium-lithium alloy according to claim 4, wherein the stress relief annealing comprises the following specific contents: and heating the magnesium-lithium alloy subjected to the solution treatment to 527-553K, preserving the heat for 1-2 h, and cooling along with the furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911308707.8A CN111020325A (en) | 2019-12-18 | 2019-12-18 | Corrosion-resistant magnesium-lithium alloy |
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| CN201911308707.8A CN111020325A (en) | 2019-12-18 | 2019-12-18 | Corrosion-resistant magnesium-lithium alloy |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113355570A (en) * | 2021-06-23 | 2021-09-07 | 西安四方超轻材料有限公司 | High-elongation soluble magnesium-lithium alloy material and preparation method thereof |
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| CN102978492A (en) * | 2012-11-30 | 2013-03-20 | 东北大学 | Rare-earth and Zr reinforced Mg-Li based wrought magnesium alloy and preparation method thereof |
| CN104480330A (en) * | 2014-12-11 | 2015-04-01 | 江阴宝易德医疗科技有限公司 | Ultrafine twin-crystal deformed magnesium alloy profile as well as preparation method and application of ultrafine twin-crystal deformed magnesium alloy profile |
| CN105845884A (en) * | 2016-05-11 | 2016-08-10 | 天津大学 | Mg-Li-Al alloy electrode modified by cerium-rich mixed rare earth elements for sea cell and preparation method of Mg-Li-Al alloy electrode |
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2019
- 2019-12-18 CN CN201911308707.8A patent/CN111020325A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113355570A (en) * | 2021-06-23 | 2021-09-07 | 西安四方超轻材料有限公司 | High-elongation soluble magnesium-lithium alloy material and preparation method thereof |
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