CN105220041B - A kind of high-strength wrought magnesium alloys and preparation method thereof - Google Patents
A kind of high-strength wrought magnesium alloys and preparation method thereof Download PDFInfo
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- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 51
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 48
- 239000000956 alloy Substances 0.000 claims abstract description 48
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 25
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 18
- 239000011777 magnesium Substances 0.000 claims abstract description 9
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 239000004615 ingredient Substances 0.000 claims abstract description 3
- 238000012545 processing Methods 0.000 claims description 10
- 238000005275 alloying Methods 0.000 claims description 4
- 229910052726 zirconium Inorganic materials 0.000 claims description 3
- 229910052688 Gadolinium Inorganic materials 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 229910052727 yttrium Inorganic materials 0.000 claims description 2
- 238000005242 forging Methods 0.000 claims 1
- 239000013078 crystal Substances 0.000 abstract description 10
- 238000001556 precipitation Methods 0.000 abstract description 8
- 238000005728 strengthening Methods 0.000 abstract description 5
- 230000003014 reinforcing effect Effects 0.000 abstract description 4
- 239000007769 metal material Substances 0.000 abstract description 3
- 238000006467 substitution reaction Methods 0.000 abstract description 3
- 230000002401 inhibitory effect Effects 0.000 abstract 1
- 239000000126 substance Substances 0.000 description 17
- 238000001125 extrusion Methods 0.000 description 13
- 238000005266 casting Methods 0.000 description 12
- 239000011701 zinc Substances 0.000 description 11
- 239000000203 mixture Substances 0.000 description 9
- 238000004458 analytical method Methods 0.000 description 8
- 230000005484 gravity Effects 0.000 description 6
- 238000000265 homogenisation Methods 0.000 description 6
- 229910052749 magnesium Inorganic materials 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 238000011282 treatment Methods 0.000 description 6
- 239000010419 fine particle Substances 0.000 description 5
- 229910052725 zinc Inorganic materials 0.000 description 5
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 4
- 229910001093 Zr alloy Inorganic materials 0.000 description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 3
- 239000010931 gold Substances 0.000 description 3
- 229910052737 gold Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 210000001787 dendrite Anatomy 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000001376 precipitating effect Effects 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 238000012827 research and development Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 1
- 229910052691 Erbium Inorganic materials 0.000 description 1
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 229910009378 Zn Ca Inorganic materials 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000006025 fining agent Substances 0.000 description 1
- LQHZJYFIRFRDKF-UHFFFAOYSA-N gold magnesium Chemical group [Mg].[Au] LQHZJYFIRFRDKF-UHFFFAOYSA-N 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000001192 hot extrusion Methods 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000001226 reprecipitation Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
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- Extrusion Of Metal (AREA)
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Abstract
The invention discloses a kind of high-strength magnesium alloys and preparation method thereof, belong to light metal material technical field.Weight percentage, the magnesium alloy ingredient are：Zn2.0 6.5%, RE0.1 3.0%, Ca0.1 2.0%, remaining is Mg and inevitable impurity；Grain refiner Mn and/or Zr can also be contained.Zn is main intensified element in alloy, it strengthens the room temperature intensity to improve magnesium alloy by solution strengthening and Precipitation；Ca is for promotion precipitation, crystal grain thinning, raising alloy high-temp intensity；A small amount of RE is for inhibiting to recrystallize, and alloy grain and regulation and control texture, improve alloy plasticity after refinement deformation.The present invention replaces expensive rare earth element by using cheap common alloy element, is allowed to the generation reinforcing effect same with rare-earth phase, completely substitution or reduction content of rare earth, cost of alloy is reduced while proof strength.
Description
Technical field
The present invention relates to light metal material technical fields, and in particular to a kind of high-strength wrought magnesium alloys and its preparation side
Method.
Background technology
Magnesium alloy is as a kind of novel light metal material, with density is low, specific strength is high, shock resistance, can be recycled
Etc. series of advantages, have broad application prospects.Especially along with armies such as the traffic and transport fields such as aviation, high ferro and space flight
The high speed development in work field, the demand to high-strength wrought magnesium alloys are increasingly urgent.
At present, high-strength wrought magnesium alloys commercially only have AZ80 (Mg-8Al-0.4Zn) and ZK60 (Mg-6Zn-
0.5Zr).Their tensile strength after deformation+aging strengthening model are about 300-350MPa, room temperature elongation 8%.And at present should
The tensile strength for being used as the aluminium alloy of structural member used in traffic and transport field is generally higher than 400MPa, therefore close high-strength magnesium
Gold substitution part aluminium alloy is applied in traffic and transport field, and there is an urgent need to develop tensile strength to be more than 400MPa, and cost and aluminium
The close low-cost high-strength wrought magnesium alloy of alloy.
By adding a small amount of rare earth element (1-3%RE) to AZ80 and ZK60 alloys, intensity is improved using ternary precipitated phase,
So as to obtain high-strength wrought magnesium alloys.Such as Chinese invention patent (denomination of invention：A kind of high-strength and high ductility weldable deformable rare earth magnesium closes
Gold, application number：200610172788.X) disclose a kind of Mg- (5.5wt%~6.4wt%) Zn- (0.7wt.%~
1.7wt%) Ym- (0.45wt%~0.8wt%) Zr alloys, under As-extruded, room temperature average tensile strength is the alloy
340MPa.A kind of high-strength deforming magnesium alloy, chemical composition Al are disclosed in CN101805865A patents：7.8~9.2%,
Zn：0.2~0.8%, Mn：0.2~0.5%, 0.5~2.0% rare earth, the maximum tensile strength of acquisition is 360MPa, maximum
Room temperature elongation is 11.5%.Mg- is disclosed in the patent of " a kind of Wrought magnesium alloys in high intensity, high plasticity and preparation method thereof "
(4.5wt%~5.5wt%) Zn- (0.5wt.%~2.5wt%) Ce- (0.01wt.%~0.2wt%) Ti alloys, after extruding
Room temperature average tensile strength for 360MPa, yield strength 245MPa, elongation after fracture 7%.Above-mentioned alloy be in ZK60 or
On the basis of person AZ80, a small amount of rare earth element (1~3wt%) is added in, improves the room temperature intensity, elevated temperature strength and weldability of alloy
Energy.But the content of rare earth added in these alloys is less, and precipitating reinforcing effect is undesirable, and deformation states strength of alloy is low
In 400MPa, it is impossible to meet requirement of the traffic and transport field to light material intensity.
Then, people make content of rare earth reach more than 10wt%, develop by reducing Zn contents and increasing content of rare earth
The Mg-RE-Zn-Zr systems alloy of the low zinc of high rare earth further improves the intensity of alloy by the techniques such as squeezing or rolling,
Intensity can be more than 400MPa, part in high-strength and high-ductility magnesium alloy and its manufacturing method as disclosed in patent CN101705404A
The intensity of alloy reaches 400MPa；[T.Homma, N.Kunito, and S.Kamado, Fabrication of also in document
extraordinary high-strength magnesium alloy by hot extrusion.Scripta
Materialia,2009.61(6):P.644-647 Mg-10Gd-3Y-1Zn-0.5Zr alloys] are referred to, after extruding and heat treatment
Tensile strength reaches 450MPa, and elongation reaches 6%.Due to containing in the Mg-RE-Zn-Zr systems alloy of the low zinc of this kind of high rare earth
A large amount of expensive rare earth element (alloy Rare-Earth Content is more than 10%) elements cause cost of alloy to be multiplied (20 yuan of magnesium/public affairs
Jin, rare earth 300-500 members/kilogram), thus this kind of high intensity Mg-RE-Zn-Zr alloys are difficult to industrially obtain scale application
With.
In conclusion the deformation high-strength magnesium alloy developed now, does not reach requirement there are intensity or intensity reaches
More than 400MPa but the shortcomings of too high cost.Therefore, it is low more than 400MPa there is an urgent need to explore and develop a kind of tensile strength
Cost wrought magnesium alloy to meet the needs of fields such as communications and transportation are to light-weight high-strength material, pushes high-strength deformation magnesium to close
The commercial Application process of gold.
Invention content
For existing wrought magnesium alloy there are the problem of intensity deficiency or excessively high cost, the present invention provides a kind of high-strength
Wrought magnesium alloy and preparation method thereof is spent, expensive rare earth element is replaced by using cheap common alloy element, is allowed to
Generate with rare-earth phase with reinforcing effect, completely substitution or reduce content of rare earth, while proof strength reduce alloy into
This.
The technical scheme is that：
A kind of high-strength wrought magnesium alloys, weight percentage, the magnesium alloy ingredient are：Zn2.0-6.5%,
RE0.1-3.0%, Ca0.1-2.0%, remaining is Mg and inevitable impurity；Wherein：RE is rare earth element, and RE can be
One or more of Gd, Y, Ce, La, Nd and Er.
Also contain grain refiner in the magnesium alloy, the brilliant material fining agent is Mn and/or Zr, and the content of the Mn is
The content of 0.2-2.0wt% (preferably 0.3-1.5wt%), Zr are 0.01-0.8wt% (preferably 0.3-0.7wt%).
In magnesium alloy of the present invention, Zn contents are preferably 2.0-6.0wt%, and RE contents are preferably 0.3-1.5wt%, Ca contents
Preferably 0.2-1.5wt%.
By above-mentioned alloying component batch mixing and alloy cast ingot is made, alloy cast ingot obtains this hair by plastic deformation hot-working
Bright high-strength wrought magnesium alloys；The plastic deformation hot-working is the plastic deformations such as to be squeezed, rolled or forge to process.
Design principle of the present invention is as follows：
The present invention makes it form the analysis of Mg-Zn-RE ternarys with Mg, Zn by Mg-Zn alloys, adding a small amount of rare earth element
Go out phase, while adding cheap Ca elements makes it form Mg-Zn-Ca ternary precipitated phases with Mg, Zn, can replace part
Mg-Zn-RE precipitation strength phases；Add a small amount of Mn and Zr elements, refine as-cast grain, and deforming with reference to RE and Ca elements
Grain Refinement Effect in the process realizes the complex intensifying of refined crystalline strengthening and precipitation strength, can both reduce the content of rare earth, also
Intensity can be further improved, obtains a kind of low-cost high-strength wrought magnesium alloy.
The present invention selects alloying element, optimization element to match by science, and regulation and control precipitated phase type, quantity and distribution increase
Strong precipitating reinforcing effect；The crystallite dimension of refining alloy as-cast grain and alloy after deformation simultaneously plays refined crystalline strengthening effect, profit
It is acted on the complex intensifying of precipitation strength and refined crystalline strengthening, improves magnesium alloy strength.
The present invention is by adding specific alloy elements organization of regulation control structure to improve mechanical property, by alloy into setting up separately
Meter and tissue modulation, and using plastic processing, obtain a kind of high-strength wrought magnesium alloys.With the high-strength ZK60 of business AZ80 magnesium close
High-strength magnesium alloy prepared by golden, high rare earth high-strength magnesium alloy and special process is compared, and the present invention has the advantages that a series of：
1st, high-strength wrought magnesium alloys Rare-Earth Content of the invention is less than 3%, and cost is than the Mg- of high rare-earth content
The cost reduction 2/3 of RE-Zn-Zr alloys.
2nd, high-strength wrought magnesium alloys tensile strength of the invention reaches more than 400MPa, far above business ZK60 and AZ80
High-strength magnesium alloys are waited, and cost only increases by 5%.
3rd, the preparation of high-strength wrought magnesium alloys of the invention can by industrial conventional equipment, such as it is common squeeze or
Rolling can be realized, and batch production can be realized on existing industrial equipment, without passing through special processing method, processing cost
It is low.
Description of the drawings
Fig. 1 is the tissue of low-cost high-strength wrought magnesium alloy in the embodiment of the present invention 1；Wherein：(a) as-cast structure, (b)
Tissue after extruding.
Fig. 2 is the tissue of low-cost high-strength wrought magnesium alloy in the embodiment of the present invention 2；Wherein：(a) as-cast structure, (b)
Tissue after extruding.
Fig. 3 is the tissue of low-cost high-strength wrought magnesium alloy in the embodiment of the present invention 3；Wherein：(a) as-cast structure, (b)
Tissue after extruding.
Fig. 4 is the tissue of low-cost high-strength wrought magnesium alloy in the embodiment of the present invention 4；Wherein：(a) as-cast structure, (b)
Tissue after extruding.
Specific embodiment
Technical solution of the present invention is described in detail with reference to the accompanying drawings and embodiments, described example is only this
Invention part of the embodiment is not limitation of the invention instead of all the embodiments yet.Based on the implementation in invention
Example, all other embodiment that those skilled in the art are obtained without making creative work belong to this hair
The range of bright protection.
Table 1 is low-cost high-strength wrought magnesium alloy Mg-Zn-RE-Ca-Mn- (Zr) alloying in 1-5 of the embodiment of the present invention
Composition (data are chemical analysis as a result, in terms of mass percentage in table) is learned, formula described in table 1 is only in protection domain
Fractions.Table 2 is room temperature tensile mechanical property of the alloy after extruding in embodiment 1-5.Table 3 is existing business and research and development
High-strength wrought magnesium alloys room-temperature mechanical property.
Embodiment 1
Metal mold gravity casting is used to obtain the length of side as 200mm, the square ingot casting of a height of 150mm.By chemical analysis,
Its chemical composition is：Mg-2.0Zn-0.8Gd-0.7Ca-0.5Mn.Shown in its as-cast structure such as Fig. 1 (a), as-cast grain size is
50-100 microns.
Alloy cast ingot carries out Homogenization Treatments 16h at 420 DEG C；The extrusion billet of a diameter of 50mm is cut into after processing.It squeezes
Pressure blank keeps the temperature 2 hours at 380 DEG C, is put into extrusion cylinder and is squeezed, obtains the extruded rod of a diameter of 12mm.Extruded rod it is micro-
See tissue such as Fig. 1 (b)；Crystal grain refinement is to 2-5 microns after extruding, and according to Hall-Petch relationships, crystal grain refinement will improve conjunction
The intensity of gold.Mechanics Performance Testing, tensile strength 418MPa, yield strength are carried out by national standard GB/T228-2002
405MPa, elongation 8.5%, as shown in table 2.
Embodiment 2
Metal mold gravity casting is used to obtain the length of side as 200mm, the square ingot casting of a height of 150mm.By chemical analysis,
Its chemical composition is：Mg-3.0Zn-0.2Gd-2.0Ca-0.2Mn-0.3Zr.Shown in its as-cast structure such as Fig. 2 (a), as-cast grain
Size is 50-100 microns, due to the increase of Zn contents, forms dendrite, and produce the second more phase.
Alloy cast ingot carries out Homogenization Treatments 12h at 400 DEG C；The extrusion billet of a diameter of 50mm is cut into after processing.It squeezes
Pressure blank keeps the temperature 2 hours at 380 DEG C, is put into extrusion cylinder and is squeezed, obtains the extruded rod of a diameter of 12mm.Extruded rod it is micro-
See tissue such as Fig. 2 (b)；Crystal grain refinement is to 1-5 microns after extruding, and produces many fine particle precipitated phases, crystal grain refinement
Intensity is further improved with precipitation hardened.Mechanics Performance Testing is carried out by national standard GB/T228-2002, tensile strength is
425MPa, yield strength 409MPa, elongation 7.3%, as shown in table 2.
Embodiment 3
Metal mold gravity casting is used to obtain the length of side as 200mm, the square ingot casting of a height of 150mm.By chemical analysis,
Its chemical composition is：Mg-4.1Zn-3Y-0.2Ca-2.0Mn.Shown in its as-cast structure such as Fig. 3 (a), as-cast grain size 50-
100 microns, continue to increase due to Zn contents, dentrite quantity is more, and the second phase amount also increases.
Alloy cast ingot carries out Homogenization Treatments 12h at 380 DEG C；The extrusion billet of a diameter of 50mm is cut into after processing.It squeezes
Pressure blank keeps the temperature 2 hours at 380 DEG C, is put into extrusion cylinder and is squeezed, obtains the extruded rod of a diameter of 12mm.Extruded rod it is micro-
See tissue such as Fig. 3 (b)；Crystal grain refinement is to 1-5 microns after extruding, and produces many fine particle precipitated phases, while also deposit
In some the second coarse phases, crystal grain refinement and precipitation hardened complex intensifying improve the intensity of alloy.By national standard GB/
T228-2002 carries out Mechanics Performance Testing, tensile strength 439MPa, yield strength 422MPa, elongation 7.0%, such as table 2
It is shown.
Embodiment 4
Metal mold gravity casting is used to obtain the length of side as 200mm, the square ingot casting of a height of 150mm.By chemical analysis,
Its chemical composition is：Mg-6.0Zn-1.5Y-1.0Ca-0.6Mn-0.8Zr.Shown in its as-cast structure such as Fig. 4 (a), as-cast grain
Size is 50-100 microns, continues to increase due to Zn contents, dentrite quantity is more, and the second phase amount also increases.
Alloy cast ingot carries out Homogenization Treatments 12h at 380 DEG C；The extrusion billet of a diameter of 50mm is cut into after processing.It squeezes
Pressure blank keeps the temperature 2 hours at 360 DEG C, is put into extrusion cylinder and is squeezed, obtains the extruded rod of a diameter of 12mm.Extruded rod it is micro-
See tissue such as Fig. 4 (b)；Crystal grain refinement is to 1-5 microns after extruding, and produces many fine particle precipitated phases, while also deposit
In some the second coarse phases, crystal grain refinement and precipitation hardened complex intensifying improve the intensity of alloy.By national standard GB/
T228-2002 carries out Mechanics Performance Testing, tensile strength 460MPa, yield strength 446MPa, elongation 6.5%, such as table 2
It is shown.
Embodiment 5
Metal mold gravity casting is used to obtain the length of side as 200mm, the square ingot casting of a height of 150mm.By chemical analysis,
Its chemical composition is：Mg-5.9Zn-0.9Ce-0.5Ca-0.5Zr.Its as-cast structure as-cast grain size is 50-100 microns, is deposited
In many dendrite and the second phase amount, the addition of Zr is reduced as-cast grain.
Alloy cast ingot carries out Homogenization Treatments 12h at 380 DEG C；The extrusion billet of a diameter of 50mm is cut into after processing.It squeezes
Pressure blank keeps the temperature 2 hours at 360 DEG C, is put into extrusion cylinder and is squeezed, obtains the extruded rod of a diameter of 12mm.The crystalline substance of extruded rod
Grain is refined to 1-5 microns, and there is also many fine particle precipitated phases and some second coarse phases, crystal grain refinement and precipitations
It is the main reason for alloy strength improves mutually to strengthen complex intensifying.Mechanics Performance Testing is carried out by national standard GB/T228-2002,
Tensile strength is 462MPa, yield strength 445MPa, elongation 6.8%, as shown in table 2.
Embodiment 6
Metal mold gravity casting is used to obtain the length of side as 200mm, the square ingot casting of a height of 150mm.By chemical analysis,
Its chemical composition is：Mg-5.2Zn-1.1Gd-1.2Ca.Its as-cast structure as-cast grain size is 100-200 microns, is existed very
Racemosus crystalline substance and the second phase amount.
Alloy cast ingot carries out Homogenization Treatments 12h at 380 DEG C；The extrusion billet of a diameter of 50mm is cut into after processing.It squeezes
Pressure blank keeps the temperature 2 hours at 360 DEG C, is put into extrusion cylinder and is squeezed, obtains the extruded rod of a diameter of 12mm.The crystalline substance of extruded rod
Grain is refined to 2-5 microns, and there is also many fine particle precipitated phases and some second coarse phases.By national standard GB/T228-
2002 progress Mechanics Performance Testings, tensile strength 443MPa, yield strength 425MPa, elongation 6.9%, as shown in table 2.
Mg-Zn-RE-Ca-Mn- (Zr) alloy composition (wt%) in 1 embodiment 1-6 of table
| Number | Zn | RE | Ca | Mn | Zr | Mg |
| Alloy 1 | 2.0 | 0.8 | 0.7 | 0.5 | 0 | Surplus |
| Alloy 2 | 3.0 | 0.2 | 2.0 | 0.2 | 0.3 | Surplus |
| Alloy 3 | 4.1 | 3 | 0.2 | 2.0 | 0 | Surplus |
| Alloy 4 | 6.0 | 1.5 | 1.0 | 0.6 | 0.8 | Surplus |
| Alloy 5 | 5.9 | 0.9 | 0.5 | 0 | 0.5 | Surplus |
| Alloy 6 | 5.2 | 1.1 | 1.2 | 0 | 0 | Surplus |
The mechanical property after Mg-Zn-RE-Ca-Mn- (Zr) alloy extrusion in 2 embodiment 1-6 of table
3 business of table and the high-strength wrought magnesium alloys room-temperature mechanical property of research and development
| Alloys (wt.%) | Processing method | Yield strength MPa | Tensile strength/MPa |
| Mg-6.0Zn-0.4Zr(ZK60) | It squeezes | 275 | 380 |
| Mg-8Al-0.4Zn-0.2Mn(AZ80) | It squeezes | 305 | 365 |
| Mg-6.0Zn-0.4Ag-0.2Ca-0.6Zr | It squeezes | 288 | 351 |
| Mg-9.8Sn-1.2Zn-1.0Al | It squeezes | 280 | 308 |
| Mg-14.0Gd-2.3Zn | It squeezes | 345 | 380 |
| Mg-10.0Gd-5.7Y-1.6Zn-0.6Zr | It squeezes | 419 | 461 |
| Mg-10.0Gd-3Y-1Zn-0.5Zr | It squeezes | 401 | 450 |
Claims (7)
1. a kind of high-strength wrought magnesium alloys, it is characterised in that：Weight percentage, the magnesium alloy ingredient are：Zn 3.0-
6.5%, RE 0.1-1.1%, Ca 0.1-2.0%, remaining is Mg and inevitable impurity；Wherein RE is rare earth Gd, Y
Or Ce；Also contain grain refiner in the magnesium alloy, the grain refiner is Mn and/or Zr；The content of the Mn is 0.2-
The content of 2.0wt%, Zr are 0.01-0.5wt%；The wrought magnesium alloy tensile strength reaches more than 400MPa.
2. high-strength wrought magnesium alloys according to claim 1, it is characterised in that：The content of the Mn is 0.3-
The content of 1.5wt%, Zr are 0.3-0.5wt%.
3. high-strength wrought magnesium alloys according to claim 1, it is characterised in that：The Zn contents are 3.0-6.0wt%.
4. according to any high-strength wrought magnesium alloys of claim 1-3, it is characterised in that：The RE contents are 0.3-
1.1wt%.
5. according to any high-strength wrought magnesium alloys of claim 1-3, it is characterised in that：The Ca contents are 0.2-
1.5wt%.
6. the preparation method of high-strength wrought magnesium alloys according to claim 1, it is characterised in that：By required alloying component
Simultaneously alloy cast ingot is made in batch mixing, and alloy cast ingot obtains the high-strength wrought magnesium alloys by plastic deformation hot-working.
7. the preparation method of high-strength wrought magnesium alloys according to claim 6, it is characterised in that：The plastic deformation heat
Processing is to be squeezed, rolled or Forging Plasticity deformation processing.
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