CN102304653A - High-plasticity two-phase yttrium-containing magnesium-lithium-aluminum alloy and preparation method thereof - Google Patents
High-plasticity two-phase yttrium-containing magnesium-lithium-aluminum alloy and preparation method thereof Download PDFInfo
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Abstract
The invention discloses high-plasticity two-phase yttrium-containing magnesium-lithium-aluminum alloy and a preparation method thereof. The alloy comprises the following specific components in percentage by weight: 9.50-10.80% of Li, 3.00-5.00% of Al, 0.50-0.70% of Y, 0.10-0.30% of Zr and the balance of Mg; the alloy has the structural characteristics that an alpha phase, a beta phase and a precipitated phase exist at the same time, wherein the alpha phase is a Mg-based solid solution and is in a close-packed hexagonal structure, the beta phase is a Li-based solid solution and is in a body-centered cubic structure, and the precipitated phase is a rare earth compound Al2Y; and the alloy has the characteristics of low density, high plasticity and higher strength. The preparation method disclosed by the invention is a normal-temperature plastic deformation method which combines casting with equal channel angular extrusion or traditional extrusion deformation process; and compared with the traditional high-temperature deformation process, the preparation method has good practicality and is simpler and more convenient to operate, and can be used for effectively lowering the production cost, thus the preparation method has good industrial production prospects.
Description
Technical field
The present invention relates to magnesium alloy and plastic forming technology thereof, be meant that specifically a kind of high-ductility two-phase contains magnesium lithium aluminium (Mg-Li-Al) Alloy And Preparation Method of yttrium (Y).
Background technology
Be main to add elemental lithium in the magnesium alloy materials, promptly constituted magnesium lithium alloy.The density of magnesium lithium alloy has only 1.30g/cm
3～1.65g/cm
3, be 1/2 of aluminium alloy only, be 3/4 of traditional magnesium alloy, be the lightest so far structural metallic materials.As the lightest structural metallic materials; Magnesium lithium alloy can reduce the interference of Millikan's rays to electronic equipment; The demand of Aeronautics and Astronautics industry can be satisfied, therefore in communication electronic industry, military project and aerospace traffic and transport field, increasingly extensive application will be obtained light material.In recent years, the investigator makes every effort to improve the intensity of magnesium lithium alloy, and the method that can improve intensity often causes the reduction of magnesium lithium alloy plasticity.Chinese patent 201010103173.8 discloses a kind of low rare earth high strength magnesium lithium alloy and preparation method thereof, though the tensile strength of the magnesium lithium alloy of this invention has reached 200～260MPa, yet its unit elongation only is 20%.Chinese patent 200710144339.9 discloses a kind of high-strength magnesium-lithium alloy, though the strength of alloy of this invention reaches 245～300MPa, unit elongation only is 10～25%.
In magnesium lithium alloy; The adding of Li (body-centered cubic) can reduce the axial ratio (c/a value) of magnesium lattice (close-packed hexagonal); The magnesium alloy lattice symmetry is improved; Its prismatic plane and conical surface slip system are activated more easily; Thereby improve the plasticity of alloy material; But a large amount of addings of Li element not only can improve the cost of alloy, and can cause material erosion resistance and thermostability to reduce.For this reason, the investigator must improve the plasticity of alloy largely in control Li content; When improving plasticity, prevent its strength degradation.
At present the plastic deformation temperatures to the two-phase magnesium lithium alloy generally all is higher than 100 ℃, in industrial production, for easy and simple to handle, cut down finished cost and enlarge the range of application of such alloy, the texturing temperature that reduces magnesium lithium alloy is significant.
Summary of the invention
The objective of the invention is to overcome the weak point of prior art; Through improving design of alloy and optimizing plastic deformation process, provide the two-phase of a kind of high-ductility, low density and higher-strength to contain magnesium lithium-aluminium alloy of yttrium and preparation method thereof according to the characteristics of this alloy.
The object of the invention can be realized through following measure:
A kind of high-ductility two-phase contains the magnesium lithium-aluminium alloy of yttrium; It contains magnesium, lithium, aluminium; It is characterized in that: this alloy also contains rare earth element yttrium; Concrete component and content is following by mass percentage: Li 9.50～10.80%; Al 3.00～5.00%; Y 0.50～0.70%, and Zr 0.10～0.30%, and all the other are Mg;
The said magnesium lithium-aluminium alloy tissue signature that contains yttrium is that α phase, β phase and precipitated phase exist simultaneously, and wherein α is to be the sosoloid of base with Mg mutually, is close-packed hexagonal structure, and β is to be the sosoloid of base with Li mutually, is body-centered cubic structure, and precipitated phase is Al
2The rare earth compound of Y.
The concrete component of optimizing and content is following by mass percentage:
Li 10.46～10.73%, and Al 2.80～4.49%, and Y 0.51～0.60%, and Zr 0.12～0.18%, and all the other are Mg.
Above-mentioned high-ductility two-phase contains the preparation method of the magnesium lithium-aluminium alloy of yttrium, it is characterized in that: this method is the normal temperature plastic deformation method that the deformation technique of casting and equal channel angular extruding or casting and conventional extruded combines, and it comprises the steps and processing condition:
Step 1: casting
(1) take by weighing starting material: Li 9.50～10.80% by mass percentage, Al 3.00～5.00%, and Y 0.50～0.70%, and Zr 0.10～0.30%, and all the other are Mg;
(2) starting material that taken by weighing are added vacuum induction furnace, under vacuum state, charge into argon gas, and under the argon shield condition, be warming up to smelting temperature, said smelting temperature is 680～720 ℃; After treating that metal melts fully, adopt the argon gas protection, whipped state is insulation 5～15min down, then melt is poured in the metal die, obtains ingot casting;
(3) thermal treatment: under 350 ± 10 ℃, homogenizing is handled 12～24h with ingot casting;
Step 2: viscous deformation
Adopt the plastic deformation process of equal channel angular extruding or conventional extruded
Equal channel angular extruding plastic deformation process condition is following:
Extrusion temperature: normal temperature
Extruding rate: 1mm/s～3mm/s
Squeeze pressure: 50MPa～150MPa
Lubricant: the mixture of gasoline and Graphite Powder 99;
The plastic deformation process condition of conventional extruded is following:
Extrusion temperature: normal temperature
Extruding rate: 1mm/s～5mm/s
Squeeze pressure: 100MPa～200MPa
Lubricant: the mixture of gasoline and Graphite Powder 99;
After viscous deformation, the rare earth precipitated phase Al in the alloy
2The Y disperse be distributed in α mutually with β mutually in, obtain high-ductility two-phase magnesium lithium-aluminium alloy.
The present invention compared with prior art has following advantage:
1, a kind of high-ductility two-phase of the present invention's preparation contains the magnesium lithium-aluminium alloy of yttrium, the tensile strength sigma under the room temperature
b=145～175MPa, yield strength σ
s=125～150MPa, unit elongation δ=40～60%, density p=1.30～1.50g/cm
3Have low density, high specific strength, high specific stiffness, high-ductility; The performance characteristics of higher-strength; On the higher intensity based of maintenance, the room temperature unit elongation is higher than the magnesium alloy of similar component far away, has opened up the range of application of magnesium lithium alloy at (alpha+beta) phase region two-phase alloys.
2, the present invention is through improving design of alloy, and adding rare earth element y can form compound with matrix or other alloying elements, alloy is played the effect of dispersion-strengthened; Addition element Zr is a close-packed hexagonal structure, and is very little with the solid matter atomic plane spacing mismatch of magnesium lithium alloy matrix, has good crystallography matching relationship, can play the effect of heterogeneous forming core, thereby involutory gold utensil has refining effect.
3, the present invention optimizes plastic deformation process according to the characteristics of this alloy; The distortion that has the relative α phase of β of more slip system when being utilized in distortion in the two-phase magnesium lithium alloy has good coordinative role; And the precipitated phase rare earth compound can play dispersion-strengthened and the effect that improves plasticity, and this has significant effect to the comprehensive mechanical property that improves magnesium lithium alloy.
4, preparation method of the present invention has realized the normal temperature distortion; Technology is easier than conventional high-temperature deformation operation; Preparing method's required squeeze that is shaped is lower; Thereby reduced requirement to material installation; Adopt technology of the present invention simple; Practicality is good, and has reduced production cost effectively, therefore has the favorable industrial prospect of production.
Embodiment
Through following embodiment the present invention is described further, but embodiment of the present invention is not limited thereto.
Embodiment 1
Step 1: casting
(1) take by weighing starting material: Li 10.73% by mass percentage, Al 4.49%, and Y 0.52%, and Zr 0.12%, and Mg 84.14%, and the starting material that taken by weighing are added vacuum induction furnace.
(2) starting material that taken by weighing are added vacuum induction furnace, under vacuum state, charge into argon gas, and under the argon shield condition, be warming up to smelting temperature, said smelting temperature is 680 ℃; After treating that metal melts fully, adopt the argon gas protection, whipped state is insulation 15min down, then melt is poured in the metal die, obtains ingot casting;
(3) thermal treatment: the homogenizing of ingot casting being carried out 12h under 350 ± 10 ℃ is handled.
Step 2: equal channel angular extrusion process
The ingot was cut 22mm × 22mm × 120mm sample, at room temperature, the sample coated graphite mixture of gasoline and a lubricant; into the angles of φ = 90 ° exterior angle
the ECAP the extrusion die, the extrusion rate of 1mm / s, extrusion pressure of 50MPa, using Bc path (i.e. between each pass in the same direction of rotation of the sample) extruding the two times.
After the present embodiment viscous deformation, obtain containing the magnesium lithium-aluminium alloy of yttrium; Utilize X-ray diffractometer and scanning electron microscope (SEM) that the magnesium lithium alloy material of this state has been carried out the phase composite analysis; The result shows; This alloy is the two-phase alloys by (alpha+beta) phase composite; α is close-packed hexagonal structure mutually; β is body-centered cubic structure mutually, α mutually with β mutually in equal disperse distribution Al
2The Y precipitated phase.On the microcomputer control universal testing machine, do tensile test at room temperature, with the density of Archimedes's method beta alloy, its tensile strength is 166.8MPa, and yield strength is 132.5MPa, and unit elongation reaches 49%, and density is 1.40g/cm
3
Embodiment 2
Step 1: casting
(1) take by weighing starting material: Li 10.50% by mass percentage, Al 2.85%, and Y 0.57%, and Zr 0.18%, and Mg 85.90%, and the starting material that taken by weighing are added vacuum induction furnace.
(2) starting material that taken by weighing are added vacuum induction furnace, under vacuum state, charge into argon gas, and under the argon shield condition, be warming up to smelting temperature, said smelting temperature is 720 ℃; After treating that metal melts fully, adopt the argon gas protection, whipped state is insulation 10min down, then melt is poured in the metal die, obtains ingot casting;
(3) thermal treatment: the homogenizing of ingot casting being carried out 12h under 350 ± 10 ℃ is handled.
Step 2: the plastic deformation process of conventional extruded
To extrusion ratio is that 9.7: 1 mould heats, and Heating temperature is 35 ℃ (normal temperature), insulation 2h; Specimen surface is coated the mixture lubricant of gasoline and Graphite Powder 99; Put into mould and push behind the insulation 20min down at 35 ℃ with mould, extruding rate is 3mm/s, and squeeze pressure is 180MPa, quenches immediately after the sample extruding.
After the present embodiment viscous deformation, obtain containing the magnesium lithium-aluminium alloy of yttrium; Utilize X-ray diffractometer and scanning electron microscope (SEM) that the magnesium lithium alloy material of this state has been carried out the phase composite analysis; The result shows; This alloy is the two-phase alloys by (alpha+beta) phase composite; α is close-packed hexagonal structure mutually; β is body-centered cubic structure mutually, α mutually with β mutually in equal disperse distribution Al
2The Y precipitated phase.On the microcomputer control universal testing machine, do tensile test at room temperature, with the density of Archimedes's method beta alloy, its tensile strength is 155.8MPa, and yield strength is 130.4MPa, and unit elongation reaches 43%, and density is 1.46g/cm
3
Embodiment 3
Step 1: casting
(1) take by weighing starting material: Li 9.80% by mass percentage, Al 4.50%, and Y 0.65%, and Zr 0.26%, and Mg 84.79%, and the starting material that taken by weighing are added vacuum induction furnace.
(2) starting material that taken by weighing are added vacuum induction furnace, under vacuum state, charge into argon gas, and under the argon shield condition, be warming up to smelting temperature, said smelting temperature is 700 ℃; After treating that metal melts fully, adopt the argon gas protection, whipped state is insulation 5min down, then melt is poured in the metal die, obtains ingot casting;
(3) thermal treatment: the homogenizing of ingot casting being carried out 16h under 350 ± 10 ℃ is handled.
Step 2: equal channel angular extrusion process
The ingot was cut 22mm × 22mm × 120mm sample, at room temperature, the sample coated graphite mixture of gasoline and lubricant into the interior angle of φ = 90 ° exterior angle
the ECAP the extrusion die, extrusion rate of 5mm / s, extrusion pressure is 120MPa, using A path (that is, each sample according to the original position and then extruded into a mold for the next one second squeeze) extrusion 2 passes.
Claims (3)
1. a high-ductility two-phase contains the magnesium lithium-aluminium alloy of yttrium; It contains magnesium, lithium, aluminium; It is characterized in that: this alloy also contains rare earth element yttrium; Concrete component and content is following by mass percentage: Li 9.50～10.80%; Al 3.00～5.00%; Y 0.50～0.70%, and Zr 0.10～0.30%, and all the other are Mg;
The said magnesium lithium-aluminium alloy tissue signature that contains yttrium is that α phase, β phase and precipitated phase exist simultaneously, and wherein α is to be the sosoloid of base with Mg mutually, is close-packed hexagonal structure, and β is to be the sosoloid of base with Li mutually, is body-centered cubic structure, and precipitated phase is Al
2The rare earth compound of Y.
2. a kind of high-ductility two-phase according to claim 1 contains the magnesium lithium-aluminium alloy of yttrium; It is characterized in that: saidly contain the magnesium lithium-aluminium alloy component of yttrium and content is following by mass percentage: Li 10.46～10.73%; Al 2.80～4.49%; Y 0.51～0.60%; Zr 0.12～0.18%, and all the other are Mg.
3. a high-ductility two-phase contains the preparation method of the magnesium lithium-aluminium alloy of yttrium; It is characterized in that: this method is the normal temperature plastic deformation method that the deformation technique of casting and equal channel angular extruding or casting and conventional extruded combines, and it comprises the steps and processing condition:
Step 1: casting
(1) take by weighing starting material: Li 9.50～10.80% by mass percentage, Al 3.00～5.00%, and Y 0.50～0.70%, and Zr 0.10～0.30%, and all the other are Mg;
(2) starting material that taken by weighing are added vacuum induction furnace, under vacuum state, charge into argon gas, and under the argon shield condition, be warming up to smelting temperature, said smelting temperature is 680～720 ℃; After treating that metal melts fully, adopt the argon gas protection, whipped state is insulation 5～15min down, then melt is poured in the metal die, obtains ingot casting;
(3) thermal treatment: under 350 ± 10 ℃, homogenizing is handled 12～24h with ingot casting;
Step 2: viscous deformation
Adopt the plastic deformation process of equal channel angular extruding or conventional extruded
Equal channel angular extruding plastic deformation process condition is following:
Extrusion temperature: normal temperature
Extruding rate: 1mm/s～3mm/s
Squeeze pressure: 50MPa～150MPa
Lubricant: the mixture of gasoline and Graphite Powder 99;
The plastic deformation process condition of conventional extruded is following:
Extrusion temperature: normal temperature
Extruding rate: 1mm/s～5mm/s
Squeeze pressure: 100MPa～200MPa
Lubricant: the mixture of gasoline and Graphite Powder 99;
After viscous deformation, the rare earth precipitated phase Al in the alloy
2The Y disperse be distributed in α mutually with β mutually in, obtain the magnesium lithium-aluminium alloy that the high-ductility two-phase contains yttrium.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103624238A (en) * | 2013-11-21 | 2014-03-12 | 太原理工大学 | Equal-channel angular pressing method of iron-covered magnesium |
| CN103643096A (en) * | 2013-12-13 | 2014-03-19 | 内蒙古科技大学 | Preparation method of high-performance magnesium alloy plate with double-phase structure |
| CN104099502A (en) * | 2014-08-05 | 2014-10-15 | 安徽江淮汽车股份有限公司 | Magnesium lithium alloy, preparation method thereof and preparation method for magnesium lithium alloy plate |
| CN104152765A (en) * | 2014-08-29 | 2014-11-19 | 重庆大学 | Magnesium-lithium-aluminum-neodymium alloy |
| 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 |
| CN105886804A (en) * | 2016-05-16 | 2016-08-24 | 扬州大学 | Preparation method of high-performance magnesium-zinc system alloy |
| CN108193109A (en) * | 2017-12-30 | 2018-06-22 | 鼎镁（昆山）新材料科技有限公司 | One kind contains ZrO2Refine magnesium lithium alloy composite material of double structure and preparation method thereof |
| CN110343922A (en) * | 2019-08-14 | 2019-10-18 | 西京学院 | A kind of magnesium tin alloy and its preparation method and application that human body is degradable |
| CN115505857A (en) * | 2022-09-28 | 2022-12-23 | 歌尔股份有限公司 | Magnesium-lithium alloy material and preparation method thereof |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103624238A (en) * | 2013-11-21 | 2014-03-12 | 太原理工大学 | Equal-channel angular pressing method of iron-covered magnesium |
| CN103624238B (en) * | 2013-11-21 | 2015-12-30 | 太原理工大学 | A kind of Equal-channel Angular Pressing method of iron bag magnesium |
| CN103643096A (en) * | 2013-12-13 | 2014-03-19 | 内蒙古科技大学 | Preparation method of high-performance magnesium alloy plate with double-phase structure |
| CN104099502A (en) * | 2014-08-05 | 2014-10-15 | 安徽江淮汽车股份有限公司 | Magnesium lithium alloy, preparation method thereof and preparation method for magnesium lithium alloy plate |
| CN104152765A (en) * | 2014-08-29 | 2014-11-19 | 重庆大学 | Magnesium-lithium-aluminum-neodymium alloy |
| 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 |
| US10077492B2 (en) | 2014-12-11 | 2018-09-18 | Jiangyin Biodegrade Medical Technology Co., Ltd. | Ultrafine-grained profile of twin-crystal wrought magnesium alloys, preparation process and use of the same |
| CN105886804A (en) * | 2016-05-16 | 2016-08-24 | 扬州大学 | Preparation method of high-performance magnesium-zinc system alloy |
| CN108193109A (en) * | 2017-12-30 | 2018-06-22 | 鼎镁（昆山）新材料科技有限公司 | One kind contains ZrO2Refine magnesium lithium alloy composite material of double structure and preparation method thereof |
| CN110343922A (en) * | 2019-08-14 | 2019-10-18 | 西京学院 | A kind of magnesium tin alloy and its preparation method and application that human body is degradable |
| CN115505857A (en) * | 2022-09-28 | 2022-12-23 | 歌尔股份有限公司 | Magnesium-lithium alloy material and preparation method thereof |
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Application publication date: 20120104 |