CN107541630A - Effectively strengthen two-phase Mg Li Zn Y magnesium lithium alloys and preparation method using rare earth element y - Google Patents
Effectively strengthen two-phase Mg Li Zn Y magnesium lithium alloys and preparation method using rare earth element y Download PDFInfo
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Abstract
The present invention relates to magnesium lithium alloy field, is specially a kind of effectively using rare earth element y reinforcing two-phase Mg Li Zn Y magnesium lithium alloys and preparation method, solves the problems, such as that magnesium lithium alloy absolute intensity is low.On the premise of Y contents are certain, pass through zinc yttrium ratio (Zn/Y=5~10) in reasonable selection alloy, the volume fraction for being incorporated into Icosahedral phases in magnesium lithium alloy matrix is reached maximum, prepare with extremely-low density, high intensity, preferable plasticity two-phase Mg Li Zn y alloys.The component and its content of the magnesium alloy materials be：Lithium (Li) content is 5~20%；Zinc (Zn) content is 3~20%；Yttrium (Y) content is 0.5~5% and magnesium (Mg) composition of surplus, and all percentages are percetage by weight.Product is deformed into through alloy melting and subsequent thermal extrusion process, its processing technology is simple, convenient.The tensile strength of material of the present invention is σb=200~350MPa, yield strength σ0.2=140~220MPa, elongation percentage are δ=10~40%, and density is 1.58~1.85g/cm3。
Description
Technical field
The present invention relates to magnesium lithium alloy field, is specially that one kind effectively strengthens two-phase Mg-Li-Zn-Y using rare earth element y
Magnesium lithium alloy and preparation method.
Background technology
So far, magnesium lithium alloy is structural metallic materials most light in engineer applied, and its density is in 1.35~1.65g/
cm3Between, have that density is low, specific strength and specific stiffness are high, cold and hot deformability is strong, anisotropy unobvious and cryogenic property
Well, the advantages that anti-high energy particle penetration capacity is strong, capability of electromagnetic shielding is good, damping capacity is good, machinability is excellent so that magnesium
Lithium alloy has potential application prospect in the high-technology field such as Aero-Space and automobile.However, compared with traditional magnesium alloy,
The absolute intensity of magnesium lithium alloy is relatively low, it is difficult to meet the bearing capacity requirement of engineering component, seriously constrains the application of the alloy
With further development.In recent years, researcher has found that the formation of Icosahedral phases has significant invigoration effect to magnesium lithium alloy.Can
It with prediction, can be entered the mechanical property of Mg-Li-Zn-Y magnesium lithium alloys by the volume fraction for increasing Icosahedral phases in alloy
The raising of one step.
However, the research work of early stage do not recognize deeply the formation of in magnesium lithium alloy Icosahedral phases and Zn/Y than pass
System, the mechanical property of alloy is improved only by the weight percentage of increase zinc (Zn) and yttrium (Y), this will make rare earth element
Invigoration effects of the Y to two-phase magnesium lithium alloy cannot be played effectively.Therefore, in order to give full play to rare earth element y to Mg-Li-
The invigoration effect of Zn-Y magnesium lithium alloys, propose and establish Icosahedral phases in magnesium lithium alloy formed with Zn/Y than relation be at present urgently
Solve the problems, such as.
The content of the invention
It is an object of the invention to provide it is a kind of effectively using rare earth element y strengthen two-phase Mg-Li-Zn-Y magnesium lithium alloys and
Preparation method, on the premise of certain Y contents, by Zn/Y ratios in reasonable selection alloy, make to be incorporated into magnesium lithium alloy matrix
The volume fraction of Icosahedral phases reaches maximum, prepares the quasi-crystalline substance with extremely-low density, high intensity, preferable plasticity and strengthens two-phase Mg-
Li-Zn-Y magnesium lithium alloys, solve the problems such as magnesium lithium alloy absolute intensity is low.
The technical scheme is that：
It is a kind of effectively to strengthen two-phase Mg-Li-Zn-Y magnesium lithium alloys using rare earth element y, the weight of zinc and yttrium ratio in alloy
Value Zn/Y is 5~10, and the volume fraction of Icosahedral phases is 3~20% in magnesium lithium alloy matrix.
Described effectively strengthens two-phase Mg-Li-Zn-Y magnesium lithium alloys, by weight percentage, alloy using rare earth element y
Middle lithium content is 5~20%；Zn content is 3~20%；Yttrium content is 0.5~5%；Magnesium surplus.
Described effectively strengthens two-phase Mg-Li-Zn-Y magnesium lithium alloys using rare earth element y, and the tensile strength of alloy is σb
=200~350MPa；Yield strength is σ0.2=140~220MPa；Elongation percentage is δ=15~30%；The density of alloy is 1.58
~1.85g/cm3。
The described preparation method for effectively strengthening two-phase Mg-Li-Zn-Y magnesium lithium alloys using rare earth element y, Mg-Li-Zn-
Y alloy melting is carried out in vacuum smelting furnace and under conditions of having argon gas to protect, and 3~5 hours are incubated at a temperature of 750~800 DEG C
Afterwards, cast molding is carried out in stove and obtains ingot casting.
The described preparation method for effectively being strengthened two-phase Mg-Li-Zn-Y magnesium lithium alloys using rare earth element y, ingot casting is existed
The Homogenization Treatments of 6~10 hours are carried out under 350~450 DEG C of temperature conditionss, and are tightly wrapped up with aluminium foil, with prevent alloy because
High-temperature oxydation and the burning being likely to occur.
The described preparation method for effectively strengthening two-phase Mg-Li-Zn-Y magnesium lithium alloys using rare earth element y, 100~
Under 350 DEG C of temperature conditionss, the ingot casting after Homogenization Treatments is subjected to plastic working processing.
The described preparation method for effectively strengthening two-phase Mg-Li-Zn-Y magnesium lithium alloys using rare earth element y, plastic working
Handle for different distortion than extruding, rolling or forging.
The present invention design philosophy be：
The present invention is by the Zn/Y ratios (being preferably 6~8) in Rational choice two-phase Mg-Li-Zn-Y magnesium lithium alloys, in alloy
Under conditions of element Y content (by weight percentage, Y is preferably 1~3%) is certain, make the quasi-crystalline substance quantity formed in alloy
Reach maximum (volume fraction of Icosahedral phases is preferably 5~15%).After METHOD FOR LARGE DEFORMATION ELASTOPLASTIC is handled, make the quasi-crystalline substance formed in alloy
Mutually crush and be evenly distributed, such effect is：Formation large-size quasi crystalline phase eutectic structure in process of setting is eliminated to cause
Stress concentration, the quasicrystal particle of fragmentation is effectively pricked dislocation motion surely, the intensity of alloy is significantly improved,
The alloy can also keep preferable plasticity simultaneously.
Advantages of the present invention and beneficial effect are：
1st, the present invention, will by controlling zinc yttrium ratio (Zn/Y) in alloying element and selecting reasonable METHOD FOR LARGE DEFORMATION ELASTOPLASTIC processing technology
The Icosahedral phases eutectic structure fragmentation of formation is simultaneously evenly distributed in the base, and its intensity is while significantly improving, moreover it is possible to keeps
Preferable plasticity.
2nd, the present invention can make full use of invigoration effect of the rare earth element y to magnesium lithium alloy using this method, greatly save
Element Y dosage, eventually reduce the cost that quasi-crystalline substance strengthens two-phase Mg-Li-Zn-Y.
3rd, the present invention obtains the two-phase quasi-crystalline substance reinforcing magnesium lithium with low-density, high intensity, high-ductility using this method and closed
Gold, particularly suitable for lightweight, high-strength, high-ductility material demand.
4th, the equipment used in the present invention is simple, and cost is relatively low, and processing technology is simple, convenient.
Brief description of the drawings
Fig. 1 (a)-Fig. 1 (c) quasi-crystalline substances strengthen two-phase Mg-Li-Zn-Y magnesium lithium alloys (embodiment 1, embodiment 2 and embodiment 3)
Microstructure photo.Wherein, the alloy Mg-8%Li-3%Zn-0.5%Y of Fig. 1 (a) embodiments 1；The 2-in-1 gold of Fig. 1 (b) embodiments
Mg-8%Li-6%Zn-1%Y；The alloy Mg-8%Li-8%Zn-1%Y of Fig. 1 (c) embodiments 3.
Fig. 2 quasi-crystalline substances strengthen Icosahedral phases in two-phase Mg-Li-Zn-Y magnesium lithium alloys (embodiment 1, embodiment 2 and embodiment 3)
Typical TEM image.
Embodiment
With reference to specific embodiment, the present invention will be further described, it is necessary to which explanation is that the embodiment provided is to be used for
Illustrate the present invention, rather than limitation of the present invention, protection scope of the present invention is not limited to the specific embodiment of following implementation.
Embodiment 1
I), the magnesium lithium alloy composition used
Strengthen two-phase Mg-Li-Zn-Y alloys using quasi-crystalline substance, its chemical composition (weight percentage) is：Lithium content is
8%；Zn content is 3%；Yttrium content is 0.5%；Magnesium surplus；Zn/Y ratios are 6 in alloy.
II), alloy smelting
Alloy smelting is carried out under argon gas protective condition in vacuum smelting furnace, after being incubated 4 hours at a temperature of 770 DEG C, in stove
Interior carry out cast molding.
III), Homogenization Treatments
Two-phase Mg-Li-Zn-Y alloys are strengthened to as cast condition quasi-crystalline substance and are incubated 8 hours at 400 DEG C, and are tightly wrapped up with aluminium foil, with
Prevent the burning being likely to occur by high-temperature oxydation of alloy.
IV), plastic processing deformation
Hot extrusion molding, extrusion ratio 10 are carried out at 350 DEG C to alloy after homogenization.
V), microstructure characterizes
Its preparation process of the sample of structure observation is as follows：Using No. 1000 carborundum silicon carbide paper flattened surfaces, then adopt
Mechanically polished with oil base diamond paste；Optical observation result shows the quasi-crystalline substance phase volume fraction formed in the sample of embodiment 1
For 5.6%, corresponding photo is shown in accompanying drawing 1 (a).
VI), Mechanics Performance Testing
The room temperature tensile properties sample of alloy is tabular, and sample full-length is 25mm, width 5mm, thickness 4mm.
The strain rate of tension test is 1 × 10-3s-1, tension test carries out on MTS (858.01M) tension-torsion testing machine, determines to close
The corresponding tensile property of gold, it is surrendered and tensile strength is respectively 148MPa and 229MPa, elongation percentage 30%, is listed in table 1.
Embodiment 2
I), the magnesium lithium alloy composition used
Strengthen two-phase Mg-Li-Zn-Y alloys using quasi-crystalline substance, its chemical composition (weight percentage) is：Lithium content is
8%；Zn content is 6%；Yttrium content is 1%；Magnesium surplus；Zn/Y ratios are 6 in alloy.
II), alloy smelting
It is same as Example 1.
III), Homogenization Treatments
It is same as Example 1.
IV), plastic processing deformation
It is same as Example 1.
V), microstructure characterizes
Structure observation method, it is same as Example 1.Optical observation result shows the Icosahedral phases formed in the sample of embodiment 2
Volume fraction is 8.3%, and corresponding photo is shown in accompanying drawing 1 (b).
VI), Mechanics Performance Testing
Tensile sample is processed and tensile property method of testing, same as Example 1.Measure bending for the 2-in-1 golden sample of embodiment
Clothes and tensile strength are respectively 159MPa and 254MPa, elongation percentage 24%, are listed in table 1.
Embodiment 3
I), the magnesium lithium alloy composition used
Strengthen two-phase Mg-Li-Zn-Y alloys using quasi-crystalline substance, its chemical composition (weight percentage) is：Lithium content is
8%；Zn content is 8%；Yttrium content is 1%；Magnesium surplus；Zn/Y ratios are 8 in alloy.
II), alloy smelting
It is same as Example 1.
III), Homogenization Treatments
It is same as Example 1.
IV), plastic processing deformation
It is same as Example 1.
V), microstructure characterizes
Structure observation method, it is same as Example 1.Optical observation result shows the Icosahedral phases formed in the sample of embodiment 3
Volume fraction is 12.5%, and corresponding photo is shown in accompanying drawing 1 (c).
VI), Mechanics Performance Testing
Tensile sample is processed and tensile property method of testing, same as Example 1.Measure bending for the alloy sample of embodiment 3
Clothes and tensile strength are respectively 185MPa and 293MPa, elongation percentage 21%, are listed in table 1.
In the present invention, quasi-crystalline substance strengthens the mechanical property of two-phase Mg-Li-Zn-Y alloys (embodiment 1, embodiment 2 and embodiment 3)
Energy data, are shown in Table 1.
Table 1
| Sample state | Yield strength (MPa) | Tensile strength (MPa) | Elongation percentage (%) | Density (g/cm3) |
| The sample of embodiment 1 | 148 | 229 | 30 | 1.63 |
| The sample of embodiment 2 | 159 | 254 | 24 | 1.69 |
| The sample of embodiment 3 | 185 | 293 | 21 | 1.72 |
As shown in Fig. 2 the electron diffraction pattern that can be seen that the alloy phase from the typical TEM image of Icosahedral phases has substantially
Fivefold symmetry feature, fully demonstrate the formation of quasi-crystalline substance in embodiment 1, embodiment 2 and the alloy sample of embodiment 3.
Embodiment result shows, effectively Mg-Li-Zn-Y two-phases can be significantly improved using rare earth element y using the present invention
The mechanical property of magnesium lithium alloy, solve the problems, such as that the absolute engineering strength of magnesium lithium alloy is low, while alloy is maintain well
Plasticity, widened the practical engineering application of such high strength magnesium lithium alloy.
Claims (7)
1. a kind of effectively strengthen two-phase Mg-Li-Zn-Y magnesium lithium alloys using rare earth element y, it is characterised in that：Zinc and yttrium in alloy
Weight ratio Zn/Y be 5~10, the volume fraction of Icosahedral phases is 3~20% in magnesium lithium alloy matrix.
2. effectively strengthening two-phase Mg-Li-Zn-Y magnesium lithium alloys using rare earth element y according to described in claim 1, its feature exists
In：By weight percentage, lithium content is 5~20% in alloy；Zn content is 3~20%；Yttrium content is 0.5~5%；More than magnesium
Amount.
3. effectively strengthening two-phase Mg-Li-Zn-Y magnesium lithium alloys using rare earth element y according to described in claim 1, its feature exists
In：The tensile strength of alloy is σb=200~350MPa；Yield strength is σ0.2=140~220MPa；Elongation percentage be δ=15~
30%；The density of alloy is 1.58~1.85g/cm3。
A kind of 4. preparation side for effectively strengthening two-phase Mg-Li-Zn-Y magnesium lithium alloys using rare earth element y described in claim 1
Method, it is characterised in that Mg-Li-Zn-Y alloy meltings are carried out under conditions of argon gas protection in vacuum smelting furnace and having, in 750~
After being incubated 3~5 hours at a temperature of 800 DEG C, cast molding acquisition ingot casting is carried out in stove.
5. according to the preparation side for effectively strengthening two-phase Mg-Li-Zn-Y magnesium lithium alloys using rare earth element y described in claim 4
Method, it is characterised in that ingot casting is carried out under 350~450 DEG C of temperature conditionss to the Homogenization Treatments of 6~10 hours, and uses aluminium foil
Tight parcel, to prevent the burning being likely to occur by high-temperature oxydation of alloy.
6. according to the preparation side for effectively strengthening two-phase Mg-Li-Zn-Y magnesium lithium alloys using rare earth element y described in claim 4
Method, it is characterised in that under 100~350 DEG C of temperature conditionss, the ingot casting after Homogenization Treatments is subjected to plastic working processing.
7. according to the preparation side for effectively strengthening two-phase Mg-Li-Zn-Y magnesium lithium alloys using rare earth element y described in claim 6
Method, it is characterised in that plastic working processing for different distortion than extruding, rolling or forging.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107675053A (en) * | 2017-08-29 | 2018-02-09 | 西安理工大学 | A kind of preparation method of high strength magnesium lithium alloy and its deep cooling intensive treatment |
| CN108456814A (en) * | 2018-01-24 | 2018-08-28 | 上海交通大学 | A kind of quasi-crystalline substance reinforcing magnesium lithium alloy and preparation method thereof containing Er |
| CN109127974A (en) * | 2018-10-15 | 2019-01-04 | 临沂高新区双航材料科技有限公司 | A kind of forging method of helmet magnesium lithium-base alloy guide rail |
| CN111235413A (en) * | 2020-02-08 | 2020-06-05 | 苏州轻金三维科技有限公司 | Preparation method of high-strength ultralight metal material |
| CN111270117A (en) * | 2020-02-08 | 2020-06-12 | 苏州轻金三维科技有限公司 | High-strength ultralight alloy and preparation method thereof |
| CN115896573A (en) * | 2022-12-23 | 2023-04-04 | 深圳市鑫申新材料科技有限公司 | High-strength high-heat-conductivity die-casting magnesium alloy and preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107675053A (en) * | 2017-08-29 | 2018-02-09 | 西安理工大学 | A kind of preparation method of high strength magnesium lithium alloy and its deep cooling intensive treatment |
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| CN108456814A (en) * | 2018-01-24 | 2018-08-28 | 上海交通大学 | A kind of quasi-crystalline substance reinforcing magnesium lithium alloy and preparation method thereof containing Er |
| CN109127974A (en) * | 2018-10-15 | 2019-01-04 | 临沂高新区双航材料科技有限公司 | A kind of forging method of helmet magnesium lithium-base alloy guide rail |
| CN111235413A (en) * | 2020-02-08 | 2020-06-05 | 苏州轻金三维科技有限公司 | Preparation method of high-strength ultralight metal material |
| CN111270117A (en) * | 2020-02-08 | 2020-06-12 | 苏州轻金三维科技有限公司 | High-strength ultralight alloy and preparation method thereof |
| CN115896573A (en) * | 2022-12-23 | 2023-04-04 | 深圳市鑫申新材料科技有限公司 | High-strength high-heat-conductivity die-casting magnesium alloy and preparation method and application thereof |
| CN115896573B (en) * | 2022-12-23 | 2023-09-01 | 深圳市鑫申新材料科技有限公司 | High-strength high-heat-conductivity die-casting magnesium alloy and preparation method and application thereof |
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Application publication date: 20180105 |