CN107964602A - Improve the effective ways of high intensity Mg-Gd-Y-Nd-Zr magnesium alloy plastic forming abilities - Google Patents
Improve the effective ways of high intensity Mg-Gd-Y-Nd-Zr magnesium alloy plastic forming abilities Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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Abstract
Plasticity the present invention relates to high-strength magnesium alloy improves field, is specially that a kind of element Li that efficiently uses improves the method for high intensity Mg Gd Y Nd Zr magnesium alloy plastic forming abilities, solves the problems, such as that high intensity plasticity is very poor.On the premise of all elements relative amount in keeping alloy is constant, by adding the Li elements that weight percentage is 5~20%, make to form the β Li phases with compared with forced plasticity deforming ability in alloy, and control the volume fraction (20~90%) for forming β Li phases, prepare the Gd Y Nd Zr alloys of Mg containing lithium with high intensity and preferable plasticity, plate is processed into through alloy melting and subsequent thermal rolling, its processing technology is simple, convenient.Tensile strength of the material of the present invention under as-cast condition is σb=120~250MPa, yield strength σ0.2=80~150MPa, elongation percentage are δ=10~30%, and density is 1.50~1.89g/cm3, and plate is not at room temperature that phenomenon is split on side after the deformation of 40% amount of rolling.
Description
Technical field
Plasticity the present invention relates to high-strength magnesium alloy improves field, and it is high-strength to efficiently use element Li improvement for specially one kind
Spend the method for Mg-Gd-Y-Nd-Zr magnesium alloy plastic forming abilities.
Background technology
In all structural metallic materials, the density of magnesium alloy is minimum, is respectively the 2/3 of aluminium alloy, stainless steel
1/4.If magnesium alloy materials can largely substitute if stainless steel and aluminium alloy be applied on aircraft and vehicle, not only may be used
To achieve the purpose that to solve itself lightweight and speed-raising, and it can also efficiently solve energy saving and environmentally friendly relevant a series of ask
Topic.Meanwhile magnesium alloy is also with specific strength and specific stiffness are high, anti-high energy particle penetration capacity is strong, capability of electromagnetic shielding is good, damping
The advantages that performance is good, machinability is excellent so that magnesium alloy has potential in the high-technology field such as aerospace and automobile
Application prospect.
However, compared with conventional metal frames material, the absolute engineering strength of magnesium alloy is relatively low, it is difficult to meet engineering component
Bearing capacity requirement, seriously constrain the application of the alloy and further development.In recent years, researcher has found rare earth member
Element addition can notable reinforced magnesium alloy, the maximum tensile strength of Mg-Gd-Y-Nd-Zr alloys can be made to reach more than 400MPa,
It is substantially suitable with moderate strength aluminium alloy.However, the plasticity of Mg-Gd-Y-Nd-Zr magnesium alloys is very poor, its elongation percentage is difficult to surpass
5% is crossed, causes the plastic forming ability of alloy very limited.
Earlier studies have shown that the addition of element Li can promote the formation of β-Li phases in magnesium alloy, alloy is remarkably improved
Plastic forming ability.It is expected that if the Li of constant weight percentage is added into high intensity Mg-Gd-Y-Nd-Zr magnesium alloys
Element, forms the β-Li phases of certain volume fraction, can effectively improve the plastic forming ability of alloy, most greatly promotes at last
And widen the practical engineering application of high-strength magnesium alloy.
The content of the invention
Improve having for high intensity Mg-Gd-Y-Nd-Zr magnesium alloy plastic forming abilities it is an object of the invention to provide a kind of
Efficacious prescriptions method, on the premise of all elements relative amount in keeping alloy is constant, by the Li members for adding constant weight percentage
Element, makes to form the β-Li phases with compared with forced plasticity deforming ability in alloy, and controls the volume fraction for forming β-Li phases, prepares
The alloys of Mg-Gd-Y-Nd-Zr containing lithium with high intensity and preferable plasticity, solve high-strength magnesium alloy plastic forming energy force difference etc. and ask
Topic.
The technical scheme is that：
A kind of effective ways for improving high intensity Mg-Gd-Y-Nd-Zr magnesium alloy plastic forming abilities, lithium content in alloy
For 5~20%, the volume fraction for forming β-Li phases is 20~90%.
The effective ways of the improvement high intensity Mg-Gd-Y-Nd-Zr magnesium alloy plastic forming abilities, by weight percentage
Than meter, gadolinium concentrations are 5~10%；Yttrium content is 3~8%；Neodymium content is 0.5~2%；Zirconium content is 0.3~1.0%；Lithium contains
Measure as 5~20%；Magnesium surplus.
The effective ways of the improvement high intensity Mg-Gd-Y-Nd-Zr magnesium alloy plastic forming abilities, alloy is in as cast condition
Under the conditions of tensile strength be σb=120~250MPa；Yield strength is σ0.2=80~150MPa；Elongation percentage for δ=10~
30%；The density of alloy is 1.50~1.89g/cm3。
The effective ways of the improvement high intensity Mg-Gd-Y-Nd-Zr magnesium alloy plastic forming abilities, sheet alloy exist
Be not in that phenomenon is split on side after the deformation of 40% amount of rolling.
The effective ways of the improvement high intensity Mg-Gd-Y-Nd-Zr magnesium alloy plastic forming abilities, by Mg-Gd-Y-
Nd-Zr alloys and pure lithium ingot are melted in vacuum smelting furnace and carried out under conditions of having argon gas protection, in 740~780 DEG C of temperature
After when the lower insulation 3~5 of degree is small, cast molding acquisition ingot casting is carried out in stove.
The effective ways of the improvement high intensity Mg-Gd-Y-Nd-Zr magnesium alloy plastic forming abilities, by ingot casting 300
Carried out under~400 DEG C of temperature conditionss 6~10 it is small when Homogenization Treatments, and tightly wrapped up with aluminium foil, with prevent alloy because of height
The burning that temperature is aoxidized and is likely to occur.
The effective ways of the improvement high intensity Mg-Gd-Y-Nd-Zr magnesium alloy plastic forming abilities, in room temperature to 350
Under DEG C temperature conditionss, the ingot casting after Homogenization Treatments is subjected to plastic working processing.
The effective ways of the improvement high intensity Mg-Gd-Y-Nd-Zr magnesium alloy plastic forming abilities, at plastic working
Manage for different distortion than extruding, rolling or forging.
The present invention design philosophy be：
Li elements of the invention by rationally adding from constant weight percentage to high intensity Mg-Gd-Y-Nd-Zr magnesium alloys
(being preferably 8~12%), (by weight percentage, the gadolinium on the premise of other element relative amounts in keeping alloy are constant
(Gd) content is 5~10%；Yttrium (Y) content is 3~8%；Neodymium (Nd) content is 0.5~2%；Zirconium (Zr) content for 0.3~
1.0%；Content is 5~20%；Magnesium surplus), make the β-Li phases (volume of β-Li phases that certain volume fraction is formed in alloy
Fraction is preferably 60~90%).After Homogenization Treatments, thick eutectic structure in alloy is set to be dissolved, it is such to act on
In：Stress concentration caused by forming large scale eutectic structure in process of setting is eliminated, has greatly given play to the modeling that β-Li mutually have
Property compatibility of deformation ability, the side that effectively prevent plate during plastic processing deformation split phenomenon, finally significantly improve alloy
Plastic forming ability.
Advantages of the present invention and beneficial effect are：
1st, the present invention can make full use of raisings of the element Li to the magnesium alloy plastic deformation coordination ability using this method, show
Work improves magnesium alloy plastic working forming ability, has effectively promoted the practical engineering application of magnesium alloy.
2nd, the present invention is obtained with the strong magnesium alloy materials of low-density, high intensity, plastic forming ability using this method,
Particularly suitable for lightweight, high-strength, high-ductility material demand.
3rd, 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 contains and high intensity Mg-7%Gd-5%Y-1%Nd-0.5%Zr magnesium alloys (comparative example 1 and implementation without Li
Example 1) XRD facies analysis results.In figure, 2 θ of abscissa is the angle of diffraction (degree), and ordinate Intensity is intensity (a.u.)
Fig. 2 contains and high intensity Mg-7%Gd-5%Y-1%Nd-0.5%Zr magnesium alloys (comparative example 1 and implementation without Li
Example 1) microstructure photo.Wherein,
(a) 1 alloy Mg-7%Gd-5%Y-1%Nd-0.5%Zr of comparative example；(b) 1 alloy Mg-7%Gd-5% of embodiment
Y-1%Nd-0.5%Zr-10%Li.
Fig. 3 (a)-Fig. 3 (b) contain with without Li high intensity Mg-7%Gd-5%Y-1%Nd-0.5%Zr magnesium alloys (compared with
Example 1 and embodiment 1) plastic deformation ability contrast.Wherein, 1 amount of rolling of Fig. 3 (a) comparative examples is 12% Mg-7%Gd-5%
Y-1%Nd-0.5%Zr sheet alloys side, while it is serious to split phenomenon；1 amount of rolling of Fig. 3 (b) embodiments is 40% Mg-7%Gd-
5%Y-1%Nd-0.5%Zr-10%Li sheet alloys side, it is boundless to split phenomenon.
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.
Comparative example 1
In the present embodiment, the effective ways for improving high intensity Mg-Gd-Y-Nd-Zr magnesium alloy plastic forming abilities are as follows：
I), the magnesium lithium alloy component used
Using high intensity Mg-7%Gd-5%Y-1%Nd-0.5%Zr alloys, its chemical composition (weight percentage) is：
Gadolinium concentrations are 7%；Yttrium content is 5%；Neodymium content is 1%；Zirconium content is 0.5%；Magnesium surplus.
II), alloy smelting
Carry out alloy smelting under argon gas protective condition in vacuum smelting furnace, when insulation 4 is small at a temperature of 770 DEG C after, in stove
Interior carry out cast molding.
III), Homogenization Treatments
To high intensity Mg-7%Gd-5%Y-1%Nd-0.5%Zr alloys when 400 DEG C of insulations 8 are small, and it is tight with aluminium foil
Parcel, to prevent the burning being likely to occur by high-temperature oxydation of alloy.
IV), plastic processing deformation
At ambient temperature, roll forming is carried out to alloy after homogenization, rolls lower amount for 12%.
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.XRD the result shows that, mainly contain α-Mg and Mg5Gd phases, phase in 1 sample of comparative example
Photo is answered to see attached drawing 1.Optical observation the result shows that, β-Li phases are not present in 1 sample of comparative example, corresponding photo is shown in attached drawing 2 (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 220MPa, and elongation percentage 1%, is listed in table 1.
VII), plastic working forming ability
When amount of rolling is 12%, high intensity Mg-7%Gd-5%Y-1%Nd-0.5%Zr sheet alloys side occurs serious
Side split phenomenon, see Fig. 3 (a).
Embodiment 1
In the present embodiment, the effective ways for improving high intensity Mg-Gd-Y-Nd-Zr magnesium alloy plastic forming abilities are as follows：
I), the alloying components of Mg-7%Gd-5%Y-1%Nd-0.5%Zr-10%Li containing lithium used
Use the high intensity Mg-7%Gd-5%Y-1%Nd-0.5%Zr-10%Li alloys containing lithium, its chemical composition (weight
Amount percentage composition) be：Gadolinium concentrations are 7%；Yttrium content is 5%；Neodymium content is 1%；Zirconium content is 0.5%；Lithium content is 10%；
Magnesium surplus.
II), alloy smelting
Mg-Gd-Y-Nd-Zr alloys and pure lithium ingot are melted in vacuum smelting furnace and under conditions of having argon gas protection
Carry out alloy smelting, when insulation 4 is small at a temperature of 770 DEG C after, cast molding is carried out in stove.
III), Homogenization Treatments
To high intensity Mg-7%Gd-5%Y-1%Nd-0.5%Zr-10%Li alloys when 400 DEG C of insulations 8 are small, and use aluminium
Paper tinsel tightly wraps up, to prevent the burning being likely to occur by high-temperature oxydation of alloy.
IV), plastic processing deformation
At ambient temperature, roll forming is carried out to alloy after homogenization, rolls lower amount for 40%.
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.XRD the result shows that, mainly contain β-Li, α-Mg and Mg5Gd in 1 sample of embodiment
Phase, corresponding photo are shown in attached drawing 1.Optical observation the result shows that, the quasi-crystalline substance phase volume fraction formed in 1 sample of embodiment be 75%,
Corresponding photo is shown in attached drawing 2 (b).
VI), Mechanics Performance Testing
Tensile sample is processed and tensile property test method is as follows：The room temperature tensile properties sample of alloy is tabular, sample
Full-length is 25mm, width 5mm, thickness 4mm.The strain rate of tension test is 1 × 10-3s-1, tension test exists
Carried out on MTS (858.01M) tension-torsion testing machine, determine the corresponding tensile property of alloy.Measure bending for 1 alloy sample of embodiment
Clothes and tensile strength are respectively 105MPa and 195MPa, and elongation percentage 24%, is listed in table 1.
VII), plastic working forming ability
Amount of rolling be 40% when, high intensity Mg-7%Gd-5%Y-1%Nd-0.5%Zr-10%Li sheet alloys side without
While splitting phenomenon, Fig. 3 (b) is seen.
Embodiment 2
In the present embodiment, the effective ways for improving high intensity Mg-Gd-Y-Nd-Zr magnesium alloy plastic forming abilities are as follows：
I), the alloying components of Mg-9%Gd-6%Y-1.5%Nd-0.5%Zr-10%Li containing lithium used
Use the high intensity Mg-9%Gd-6%Y-1.5%Nd-0.5%Zr-10%Li alloys containing lithium, its chemical composition
(weight percentage) is：Gadolinium concentrations are 9%；Yttrium content is 6%；Neodymium content is 1.5%；Zirconium content is 0.5%；Lithium content is
10%；Magnesium surplus.
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.XRD the result shows that, β-Li, α-Mg are mainly contained in 2 sample of embodiment
With Mg5Gd phases.Optical observation the result shows that, the quasi-crystalline substance phase volume fraction formed in 2 sample of embodiment be 75%.
VI), Mechanics Performance Testing
Tensile sample is processed and tensile property test method, same as Example 1.Measure bending for 2 alloy sample of embodiment
Clothes and tensile strength are respectively 135MPa and 233MPa, and elongation percentage 21%, is listed in table 1.
VII), plastic working forming ability
When amount of rolling is 40%, high intensity Mg-9%Gd-6%Y-1.5%Nd-0.5%Zr-10%Li sheet alloys side
It is boundless to split phenomenon.
In the present invention, containing with high intensity Mg-Gd-Y-Nd-Zr alloys (comparative example 1, embodiment 1 and real without Li elements
Apply example 2) mechanical performance data, be shown in Table 1.
Table 1
| Sample state | Yield strength (MPa) | Tensile strength (MPa) | Elongation percentage (%) | Density (g/cm3) |
| 1 sample of comparative example | 148 | 220 | 1 | 1.93 |
| 1 sample of embodiment | 105 | 195 | 24 | 1.56 |
| 2 sample of embodiment | 135 | 233 | 21 | 1.72 |
Embodiment the result shows that, element Li can be efficiently used using the present invention and significantly improve high intensity Mg-Gd-Y-
The plastic forming ability of Nd-Zr magnesium alloys, solves the problems, such as that magnesium alloy plasticity is poor, while alloy is maintain higher work
Cheng Qiangdu, has widened the practical engineering application of such high-strength magnesium alloy.
Claims (8)
- A kind of 1. effective ways for improving high intensity Mg-Gd-Y-Nd-Zr magnesium alloy plastic forming abilities, it is characterised in that：Alloy Middle lithium content is 5~20%, and the volume fraction for forming β-Li phases is 20~90%.
- 2. the effective ways described in accordance with the claim 1 for improving high intensity Mg-Gd-Y-Nd-Zr magnesium alloy plastic forming abilities, It is characterized in that：By weight percentage, gadolinium concentrations are 5~10%；Yttrium content is 3~8%；Neodymium content is 0.5~2%；Zirconium Content is 0.3~1.0%；Lithium content is 5~20%；Magnesium surplus.
- 3. the effective ways described in accordance with the claim 1 for improving high intensity Mg-Gd-Y-Nd-Zr magnesium alloy plastic forming abilities, It is characterized in that：Tensile strength of the alloy under as-cast condition is σb=120~250MPa；Yield strength is σ0.2=80~ 150MPa；Elongation percentage is δ=10~30%；The density of alloy is 1.50~1.89g/cm3。
- 4. the effective ways described in accordance with the claim 1 for improving high intensity Mg-Gd-Y-Nd-Zr magnesium alloy plastic forming abilities, It is characterized in that：Sheet alloy is not in that phenomenon is split on side after the deformation of 40% amount of rolling.
- 5. the effective ways described in accordance with the claim 1 for improving high intensity Mg-Gd-Y-Nd-Zr magnesium alloy plastic forming abilities, It is characterized in that：Mg-Gd-Y-Nd-Zr alloys and pure lithium ingot are melted in vacuum smelting furnace and in the condition for thering is argon gas to protect Lower progress, at a temperature of 740~780 DEG C insulation 3~5 it is small when after, in stove carry out cast molding obtain ingot casting.
- 6. according to the effective ways of the improvement high intensity Mg-Gd-Y-Nd-Zr magnesium alloy plastic forming abilities described in claim 5, It is characterized in that：Ingot casting is carried out under 300~400 DEG C of temperature conditionss 6~10 it is small when Homogenization Treatments, it is and tight with aluminium foil Parcel, to prevent the burning being likely to occur by high-temperature oxydation of alloy.
- 7. according to the effective ways of the improvement high intensity Mg-Gd-Y-Nd-Zr magnesium alloy plastic forming abilities described in claim 6, It is characterized in that：Under room temperature to 350 DEG C of temperature conditionss, the ingot casting after Homogenization Treatments is subjected to plastic working processing.
- 8. according to the effective ways of the improvement high intensity Mg-Gd-Y-Nd-Zr magnesium alloy plastic forming abilities described in claim 7, It is characterized in that：Plastic working processing for different distortion than extruding, rolling or forging.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108774703A (en) * | 2018-08-23 | 2018-11-09 | 中国科学院长春应用化学研究所 | A kind of high-strength light magnesium alloy and preparation method thereof containing Li |
| CN111118364A (en) * | 2020-01-16 | 2020-05-08 | 江苏理工学院 | Mg-Y-Nd-Gd-Zr-Li alloy capable of being rapidly age-strengthened and preparation method thereof |
| CN116099031A (en) * | 2023-01-19 | 2023-05-12 | 北京科技大学 | Degradable and absorbable magnesium alloy suture line and preparation method and application thereof |
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| US20050129566A1 (en) * | 2003-12-11 | 2005-06-16 | Fetcenko Michael A. | Mg-Ni hydrogen storage composite having high storage capacity and excellent room temperature kinetics |
| CN102618758A (en) * | 2012-04-13 | 2012-08-01 | 江汉大学 | Cast magnesium alloy of low linear shrinkage |
| 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 |
| CN103627938A (en) * | 2012-08-27 | 2014-03-12 | 中国科学院金属研究所 | High-strength magnesium alloy extruded seamless tube and making technology thereof |
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| US20050129566A1 (en) * | 2003-12-11 | 2005-06-16 | Fetcenko Michael A. | Mg-Ni hydrogen storage composite having high storage capacity and excellent room temperature kinetics |
| CN102618758A (en) * | 2012-04-13 | 2012-08-01 | 江汉大学 | Cast magnesium alloy of low linear shrinkage |
| CN103627938A (en) * | 2012-08-27 | 2014-03-12 | 中国科学院金属研究所 | High-strength magnesium alloy extruded seamless tube and making technology thereof |
| 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 |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108774703A (en) * | 2018-08-23 | 2018-11-09 | 中国科学院长春应用化学研究所 | A kind of high-strength light magnesium alloy and preparation method thereof containing Li |
| CN111118364A (en) * | 2020-01-16 | 2020-05-08 | 江苏理工学院 | Mg-Y-Nd-Gd-Zr-Li alloy capable of being rapidly age-strengthened and preparation method thereof |
| CN111118364B (en) * | 2020-01-16 | 2021-08-24 | 江苏理工学院 | Mg-Y-Nd-Gd-Zr-Li alloy capable of being rapidly age-strengthened and preparation method thereof |
| CN116099031A (en) * | 2023-01-19 | 2023-05-12 | 北京科技大学 | Degradable and absorbable magnesium alloy suture line and preparation method and application thereof |
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