CN102383013A - Wrought magnesium alloy and preparation method thereof as well as wrought magnesium alloy product and preparation method thereof - Google Patents

Wrought magnesium alloy and preparation method thereof as well as wrought magnesium alloy product and preparation method thereof Download PDF

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CN102383013A
CN102383013A CN2010102709921A CN201010270992A CN102383013A CN 102383013 A CN102383013 A CN 102383013A CN 2010102709921 A CN2010102709921 A CN 2010102709921A CN 201010270992 A CN201010270992 A CN 201010270992A CN 102383013 A CN102383013 A CN 102383013A
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wrought magnesium
magnesium alloys
ingot
alloy
wrought
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李绍青
菅永喜
张法亮
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BYD Co Ltd
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BYD Co Ltd
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Abstract

The invention discloses a wrought magnesium alloy and a preparation method thereof. The wrought magnesium alloy comprises the following components in percentage by weight: 2.0-4.0 percent of Al, 0.40-1.70 percent of Zn, 0.20-0.50 percent of Mn, 0.05-1.0 percent of B and the balance of Mg or Mg and impurities. The invention also relates to a product manufactured by using the wrought magnesium alloy and a preparation method of the product. In the preparation method of the wrought magnesium alloy, the wrought magnesium alloy is firstly subjected to homogenizing annealing and then is placed in an extrusion mould to be extruded through an extruder so as to obtain the wrought magnesium alloy product. The wrought magnesium alloy contains boron elements, has better plasticity and is extremely beneficial to subsequent plastic forming.

Description

A kind of wrought magnesium alloys and preparation method thereof and a kind of wrought magnesium alloys product and preparation method thereof
Technical field
The present invention relates to the metallic substance technical field, in particular, relate to a kind of wrought magnesium alloys and preparation method thereof of high-ductility and adopt product that this wrought magnesium alloys makes and preparation method thereof.
Background technology
Magnesiumalloy is that all structures are the lightest with weight in the metallic substance, and density is 1.75-1.90g/cm 3, be merely 2/3 of duraluminum, 1/4 of iron and steel.Compare with other structural metallic materialss; Magnesiumalloy has high specific strength, specific rigidity; Damping property, electromagnetic wave shielding and capability of resistance to radiation are strong; Being prone to series of advantages such as cut, easy recovery, having extremely important using value and wide application prospect at automobile, electronic apparatus, communication, aerospace and national defense and military industrial circle, is the 3rd metalloid structured material that after iron and steel and duraluminum, grows up.
Traditional Application of Magnesium mainly is to produce product with casting techniques such as die casting, die casting, but defective such as product occurs easily that crystal grain is thick, tissue looseness, component segregation and mechanical property are on the low side, can not give full play to the performance advantage of magnesiumalloy.At present; All attach great importance to the research and development of wrought magnesium alloys both at home and abroad; Wrought magnesium alloys is meant the magnesiumalloy of plastic molding method processing such as available extruding, rolling, forging and punching press, compares with cast magnesium alloys, and the crystal grain of wrought magnesium alloys is tiny; Segregation-free and microcosmic hole have excellent comprehensive performances.
Yet, those skilled in the art will appreciate that magnesium is the close-packed hexagonal crystalline structure, the room temperature slip system is few, causes its viscous deformation difficulty, the deformation processing difficulty, thereby common magnesiumalloy is a kind of material of difficult distortion; For example: the hot extrude bar of high-strength wrought magnesium alloys MB15, unit elongation at room temperature is merely 14.8%, and unit elongation is merely 62% in the time of 300 ℃.Yet; Important structured materials such as required sheet material, bar, tubing and the bar of the various fields in the practical application can only adopt the explained hereafter of plastic forming; Thereby; A bottleneck on bad plasticity has become magnesiumalloy processing and used, the plasticity of improving magnesiumalloy also just becomes one of technical problem that needs to be resolved hurrily in its application.
At present, deformed magnesium alloy material has begun to the seriation development, for example: series such as Mg-Al, Mg-Zn, Mg-Mn, Mg-Li, Mg-Al-Zn, Mg-Zn-Zr, Mg-Mn-Ce, Mg-Re-Zr.Wherein, Mg-Al-Zn (magnalium zinc) is that alloy is to use in the industrial production the earliest, and using also is wrought magnesium alloys the most widely, can be processed into sheet material, bar, bar and forging, and belonging to this main alloy designations that is has AZ31, AZ61, AZ80, AZ91 etc.Mg-Al-Zn is that the principal feature of alloy is that intensity is high, can heat-treat reinforcement, and shortcoming is that ys and unit elongation are not high enough.
(publication number is: CN1584090) disclose a kind of high-strength wrought magnesium alloys in the Chinese invention patent application; Comprise aluminium, zinc, manganese, calcium, silicon and magnesium, its weight percent is: aluminium: 1.5%-3.5%, zinc: 0.2%-4%; Manganese: 0.1%-0.6%; Calcium: 0.01%-2.0%, silicon 0.05%-2.0%, all the other are magnesium.Aluminium is main strengthening element in the alloy.Zinc also is the strengthening element in the alloy, can improve the plasticity of alloy.The compound adding of calcium and silicon can make and form with calcium in the alloy is the tiny Mg of core 2The Si particle, thus alloy is produced effective dispersion-strengthened action.The effect of manganese mainly is the corrosion resistance nature that improves alloy; In the alloy melting process, can also form compound with the impurity element (like iron) in the alloy; Thereby eliminate the deleterious effect of iron contamination to the alloy corrosion resistance nature, the technical scheme of this application for a patent for invention passes through to regulate the content of magnalium Zn based alloy, and through compound adding calcium and silicon; Improve the intensity and the plasticity of magnalium zinc series magnesium alloy, yet its raising to the plasticity of magnesiumalloy is limited.
Summary of the invention
The present invention is for the bad plasticity that solves wrought magnesium alloys of the prior art, the technical problem of poor processability.
The invention provides a kind of wrought magnesium alloys, the weight percent of its each component is: Al:2.0wt%-4.0wt%; Zn:0.40wt%-1.70wt%; Mn:0.20wt%-0.50wt%; B:0.05wt%-1.0wt%; Surplus comprises Mg, contain or free from foreign meter.
Preferably, the weight percent of each component is in the said wrought magnesium alloys: Al:2.50wt%-3.20wt%; Zn:1.0wt%-1.50wt%; Mn:0.25wt%-0.35wt%; B:0.3wt%-0.7wt%; Surplus is Mg.
Preferably, the weight percent of said B element is 0.3wt%-0.5wt%.
Preferably; Said impurity is one or more among Si, Fe, Cu, the Ni; Gross weight with wrought magnesium alloys is a benchmark, and the weight percent of each impurity element is: 0≤Si≤0.05wt%, 0≤Fe≤0.004wt%, 0≤Cu≤0.01wt%, 0≤Ni≤0.001wt%.
The present invention also provides the preparation method of above-mentioned wrought magnesium alloys, may further comprise the steps: the raw material magnesium alloy of formula ratio is made wrought magnesium alloys through molten alloyization, refining, cast; Said raw material magnesium alloy comprises: magnesium ingot, aluminium ingot, zinc ingot metal, aluminium manganese master alloy and boron ingot and/or aluminium boron master alloy; Wherein, the weight percent of each component is: Al:2.0wt%-4.0wt%; Zn:0.40wt%-1.70wt%; Mn:0.20wt%-0.50wt%; B:0.05wt%-1.0wt%; Surplus is Mg and impurity element.
Preferably, before said molten alloy step, raw material is carried out drying treatment, wherein, magnesium ingot, aluminium ingot, zinc ingot metal are dry under 100 ± 10 ℃ temperature, and aluminium manganese master alloy, boron ingot and/or aluminium boron master alloy are dry under 150 ± 5 ℃ temperature.
1), fusing wherein, said molten alloy step comprises:: earlier crucible is preheated to 300-350 ℃, puts into magnesium ingot, aluminium ingot, zinc ingot metal and add end flux heat fused; After treating that magnesium ingot, aluminium ingot, zinc ingot metal all melt, add aluminium manganese master alloy, continue heating; After treating the fusing of aluminium manganese master alloy; Stir, make the middle liquation of magnesiumalloy, whole melting process is at SF 6Carry out under the protection of gas, the time is controlled at 2-6H, and outlet temperature is controlled at 670-690 ℃;
2), consolute: in the middle of magnesiumalloy, add boron ingot and/or aluminium boron master alloy in the liquation, heat fused also stirs, and obtains the magnesiumalloy liquation, and consolute carries out under protection of inert gas, and the time is controlled at 1-20min, and temperature is controlled at 720-750 ℃.
Wherein, said refinement step adds refining agent in the magnesiumalloy liquation that molten alloyization obtains, and stirs; Heat up then, temperature is controlled at 690-730 ℃, and refining time is controlled at 30-45min; Be cooled to 660-720 ℃ then and leave standstill 5-20min, obtain magnesium alloy fused mass.
Wherein, the magnesium alloy fused mass of said cast step after with refining injects mould, the demoulding after the moulding; The condition of cast is: in protective atmosphere, carry out; The preheating temperature of mould is 250 ℃ ± 10 ℃, and the temperature of magnesium alloy fused mass is 660-720 ℃, and said protective atmosphere is SF 6, CO 2, N 2, SO 2, in the rare gas element one or more.
The present invention further provides a kind of wrought magnesium alloys product, and said wrought magnesium alloys product is the wrought magnesium alloys extruded bars, adopts aforesaid wrought magnesium alloys to make.
The present invention also provides the preparation method of above-mentioned wrought magnesium alloys product; Comprise the steps: that earlier wrought magnesium alloys being carried out homogenizing annealing handles; Then wrought magnesium alloys is placed extrusion mould, push, obtain the wrought magnesium alloys product through extrusion machine.
Wherein, the time of said homogenizing annealing processing is 10-12H; The condition of said extrusion molding is: the preheating temperature of extrusion mould is 350-450 ℃, and extrusion temperature is controlled at 300-450 ℃, and extrusion ratio is controlled at 10: 1-100: 1, and extrusion speed is controlled at 5m/min-20m/min.
Wrought magnesium alloys of the present invention has the characteristics of high-ductility; Particularly preferable high-temp plastic; Can satisfy the needs that magnesiumalloy carried out plastic working; Thereby can improve the production efficiency of magnesiumalloy greatly through the wrought magnesium alloys product of multiple plastic working mode (especially extrusion molding) moulding high comprehensive performance.
Description of drawings
Fig. 1 is the extruded bar from magnesium alloy that the does not add boron metaloscope photo at room temperature of Comparative Examples 1 of the present invention;
Fig. 2 is the extruded bar from magnesium alloy metaloscope photo at room temperature behind the interpolation boron of the embodiment of the invention 1;
Fig. 3 is the metaloscope photo of extruded bar from magnesium alloy under 300 ℃ of high temperature behind the interpolation boron of the embodiment of the invention 1.
Embodiment
Contriver of the present invention is in secular magnesiumalloy research, and unexpected the discovery can be improved the plasticity and the processing characteristics of wrought magnesium alloys through in the Mg-Al-Zn series deformation magnesium alloy, adding a certain amount of boron (B) element.In view of the above, the present invention provides a kind of wrought magnesium alloys, and the weight percent of its each component is: Al:2.0wt%-4.0wt%; Zn:0.40wt%-1.70wt%; Mn:0.20wt%-0.50wt%; B:0.05wt%-1.0wt%; Surplus is one or more in the impurity such as Mg and a spot of Fe, Si, Ni, Cu, wherein, and 0≤Si≤0.05wt%, 0≤Fe≤0.004wt%, 0≤Cu≤0.01wt%, 0≤Ni≤0.001wt%.
Under preferable case, in order to obtain the better wrought magnesium alloys of plasticity, the weight percent of each component is in the said wrought magnesium alloys: Al:2.50wt%-3.20wt%; Zn:1.0wt%-1.50wt%; Mn:0.25wt%-0.35wt%; B:0.3wt%-0.7wt%; Surplus is Mg.
Under preferred situation, the weight percent of said B element is 0.3wt%-0.5wt%.
The preparation of wrought magnesium alloys of the present invention can be adopted process for smelting magnesium alloy at present commonly used, comprises getting the raw materials ready → melt → step of refining → cast, and specifically details are as follows to show each step with the preparation method of wrought magnesium alloys of the present invention:
Step 1, get the raw materials ready: 1) starting material: the pure magnesium ingot (purity >=99.9wt%), fine aluminium ingot (purity >=99.9wt%), pure zinc ingot (purity >=99.9wt%), the aluminium manganese master alloy that are ready to formula ratio; And boron ingot and/or aluminium boron master alloy, wherein, need to prove; Boron can add with the form of boron ingot; Also can add with the form of aluminium boron master alloy, directly add with the boron ingot, the scaling loss in the fusion process is many; Cause component segregation easily, thereby preferably add with aluminium boron master alloy.
2) fusing assistant: end flux, insulating covering agent and refining agent, all can adopt existing end flux, insulating covering agent and the refining agent that is used for the magnesiumalloy preparation, for example: insulating covering agent RJ-6, refining agent RJ-5; End flux mainly is positioned at the bottom of crucible, does not react with crucible and corrodes crucible in order to prevent molten metal, in addition, also has the effect of slag making; And insulating covering agent mainly is to protect molten metal not react with the external world, plays isolation action; Refining agent then is used for the refining of magnesiumalloy liquation.
Step 2, drying: the raw material of preparing is carried out drying treatment; Wherein, Magnesium ingot, aluminium ingot, zinc ingot metal are dried under 100 ℃ ± 10 ℃ temperature, and aluminium manganese master alloy, boron ingot and/or aluminium boron master alloy are dried under 150 ℃ ± 5 ℃ temperature, and the effect of oven dry is in order to remove the moisture in the raw material; Prevent in the fusion process that water and reactive magnesium produce blast.
Step 3, molten alloyization: 1), the fusing: at SF 6Under the protection of gas, earlier crucible is preheated to 300-350 ℃, load weighted magnesium ingot, aluminium ingot, zinc ingot metal are put into crucible and added end flux heat fused; The consumption of end flux accounts for the 1.5-2.5wt% of quality of furnace charge, treats that magnesium ingot, aluminium ingot, zinc ingot metal all after the fusing, add load weighted aluminium manganese master alloy; Continue heating; After treating that aluminium manganese master alloy fully melts, stir, make the middle liquation of magnesiumalloy; The time of whole melting process is controlled at 2-6H, and the outlet temperature of magnesiumalloy liquation is controlled at 670-690 ℃.In whole melting process, be sprinkled into insulating covering agent frequently equably to prevent burning; The rule of spreading insulating covering agent is: do not make the metallic surface open combustion; Add-on is as far as possible little, can cover molten surface and get final product, and the consumption of insulating covering agent accounts for the 0.3-0.5wt% of quality of furnace charge; Because magnesium is active high, in air, heat, be prone to oxidization burning loss, and under molten state, when no insulating covering agent is protected, burning that can be violent.In whole fusion process, need to continue in crucible, to feed SF 6Gas is protected, and can not adopt other shielding gas, because SF 6(for example: difference rare gas element), general protection of inert gas are in order not contain oxidizing gas in the atmosphere that makes the molten metal surface to gas, and SF with general shielding gas to the action principle of magnesiumalloy liquation 6The effect of gas is to make the magnesiumalloy molten surface generate thin and fine and close layer protecting film, prevents the oxidization burning loss of magnesium.
2), consolute: in the middle of magnesiumalloy, (for example: argon gas) protect feed rare gas element in the liquation; Add load weighted boron ingot and/or aluminium boron master alloy simultaneously; And employing mechanical stirring; The interfused time is controlled at 1-20min, and temperature is controlled at 720-750 ℃, obtains the magnesiumalloy liquation behind the consolute.
Step 4, refining: (for example: argon gas) protect in the magnesiumalloy liquation, feed rare gas element; Simultaneously evenly be sprinkled into refining agent on the surface of magnesiumalloy liquation and carry out refining, and adopt mechanical stirring, the consumption of refining agent accounts for the 1.5-2.5wt% of quality of furnace charge; Heat up then; Temperature is controlled at 690-730 ℃, and refining time is controlled at 30-45min, makes metal better alloying under higher temperature of adding; Finish the back cooling and leave standstill, temperature is controlled at 660-720 ℃, and time of repose is 5-20min,, make flux and inclusion sedimentation, make alloy homogenizing more, obtain magnesium alloy fused mass.
Step 5, cast: it is 250 ℃ ± 10 ℃ mould that the magnesium alloy fused mass after the refining is injected preheating temperature; The demoulding after the moulding makes the casting of magnesium alloy rod, and the condition of cast is: under 660-720 ℃ temperature; And in protective atmosphere, carry out, protective atmosphere is generally SF 6, CO 2, N 2, SO 2, rare gas element or they mixed gas, when above-mentioned protective atmosphere can make magnesium alloy fused mass from crucible, flow into mould, not by airborne moisture or dioxygen oxidation.
The preparation method of wrought magnesium alloys product of the present invention on the basis of preparation wrought magnesium alloys, carries out extrusion molding to wrought magnesium alloys: according to the requirement of extrusion process; The homogenizing annealing that earlier the casting of magnesium alloy rod is carried out 10-12H is handled, and extrusion mould is preheated under 350-450 ℃ the condition again, and the casting of magnesium alloy rod is placed extrusion mould; Push through extrusion machine; Make extruded bar from magnesium alloy, wherein, extrusion temperature is controlled at 300-450 ℃; Extrusion ratio is controlled at 10: 1-100: 1, and extrusion speed is controlled at 5m/min-20m/min.
What deserves to be mentioned is that existing document " trace B is to the influence of corrosion resistance of magnesium alloy ability " was studied the influence of magnesiumalloy corrosive nature for trace B in (material protection, the 38th the 10th phase of volume of October in 2005); Propose micro-B the remarkable refinement of adding Mg7Al0.4Zn0.2Mn alloy organizing and crystal grain; Along with the increase of B add-on, its thinning effect is obvious more, when the add-on of B is 0.15%; The median size size refine to about 40 μ m, β-Mg by unmetamorphosed about 140 μ m 17Al 12Mutually tiny, thus the corrosion potential of alloy improved, reduced its erosion rate; Yet what relate in the document is in the AZ70 system, to add trace B, and wherein the content of boron is below the 0.15%wt, and the effect of boron is to improve corrosion potential through crystal grain thinning, thereby improves the corrosion resistance nature of alloy; Alloy system of the present invention then is the AZ31 alloy system, and wherein, the content of boron is 0.05%wt-1.0wt%, and the effect of boron mainly is in order to improve the plasticity of alloy, particularly the high temperature superplasticity property.
Further, contriver of the present invention confirms further that through a large amount of research adding boron can play the plasticity that strengthens wrought magnesium alloys, and its mechanism is:
1, the present invention can effectively reduce the c/a value in the magnesiumalloy lattice through adding non-metallic element boron, significantly increases the activation capability of conical surface slip system, so just can coordinate the axial strain of c and improves compression ductility, has improved plastic forming ability.
2, the present invention forms AlB through adding boron with aluminium 2Intermetallic compound, small and dispersed are distributed in the matrix, play the crystal grain thinning function of organization, and the crystal boundary of little intergranule more is prone to slide, and assist big crystal grain distortion simultaneously, thereby improve the plastic forming ability of alloy.
3, the present invention can also be to Mg through adding boron 17Al 12Produce metamorphism mutually, through to the refinement of alloy structure with to Mg 17Al 12The rotten effect that crackle formed or delayed crack propagation that suppresses, the plastic forming ability of raising alloy of playing of phase.
Below in conjunction with specific embodiment, the present invention is at length explained.
Embodiment 1
The preparation method of the wrought magnesium alloys product of the embodiment of the invention 1 comprises the steps:
1, oven dry: with ready raw material: pure magnesium, fine aluminium, pure zinc (purity all >=99.9wt%), aluminium manganese master alloy; And pure boron (ingot casting of purity >=99.9wt%) is dried processing; Wherein Mg, Al, Zn are dried under 100 ℃ of temperature, and AlMn master alloy, B are dried under 150 ℃ of temperature.
2, melting: in whole fusion process, continue in the resistance crucible, to feed SF 6Gas is protected, and earlier the resistance crucible is preheated to 300 ℃, sprinkles an amount of refining agent RJ-5 and insulating covering agent RJ-6 at crucible wall and bottom; Put into load weighted Mg, Al, Zn ingot metal then, continue heating, treat that Mg, Al, Zn ingot metal are all after the fusing; Adding the B that adds 0.05wt% under the temperature of closing in the middle of the load weighted AlMn under 690 ℃ the temperature, with often spreading down insulating covering agent RJ-6 equably, treat that above-mentioned alloy fully melts after; Stir, be incubated 5min simultaneously; Add refining agent RJ-5 and carry out refining; In the purified process, the add-on of refining agent is about 10% of a furnace charge amount, fully stirs, leaves standstill 5min after the adding; Be warming up to 760 ℃ of insulation 10min then; Lower the temperature again 720 ℃ and leave standstill 5min, pour into preheating temperature again and be in 250 ℃ the swage, make casting of magnesium alloy rod A1 (being deformed magnesium alloy material).
3, extruding: according to the extrusion process requirement; The homogenizing annealing that earlier the casting of magnesium alloy rod is carried out 10h is handled, and extrusion mould is preheated under 400 ℃ the condition, on extrusion machine, carries out extruded bars; Wherein extrusion temperature is controlled at 380 ℃; Extrusion ratio was controlled at 60: 1, and extrusion speed is controlled at 10m/min, obtained extruded bar from magnesium alloy A11 (being the wrought magnesium alloys product).
Embodiment 2
Raw material and preparation method and embodiment 1 are basic identical, and difference only is that the addition of boron is 0.1wt%, make casting of magnesium alloy rod A2 and extruded bar from magnesium alloy A22.
Embodiment 3
Raw material and preparation method and embodiment 1 are basic identical, and difference only is that boron adds with the form of aluminium boron master alloy, and addition is 0.5wt%, make casting of magnesium alloy rod A3 and extruded bar from magnesium alloy A33.
Embodiment 4
Raw material and preparation method and embodiment 1 are basic identical, and difference only is that boron adds with the form of aluminium boron master alloy, and addition is 1.0wt%, make casting of magnesium alloy rod A4 and extruded bar from magnesium alloy A44.
Comparative Examples 1
Comparative Examples 1 is used to explain the performance of the wrought magnesium alloys that does not add boron, and all the other are identical with embodiment 1, makes casting of magnesium alloy rod B1 and extruded bar from magnesium alloy B11.
Performance test:
1) chemical ingredients, Mechanics Performance Testing:
The casting of magnesium alloy rod A1-A4 of the foregoing description 1-4 preparation and the casting of magnesium alloy rod B1 of Comparative Examples 1 preparation are carried out chemical ingredients detection (ICP test), Mechanics Performance Testing (testing through omnipotent mechanical test machine) respectively; The chemical ingredients detected result is seen table 1, and the unit elongation test result is seen table 2.
2) micro-metallographic structure is observed:
Respectively to the casting of magnesium alloy rod B1 of the casting of magnesium alloy rod A1 of embodiment 1 preparation, Comparative Examples 1 preparation under the high temperature of room temperature and 300 ℃, carry out the sampling that micro-metallographic structure is observed, micro-metallograph is shown in Fig. 1-3.
Table 1 (massfraction wt%)
Magnesiumalloy is formed composition Aluminium Zinc Manganese Boron Magnesium
Comparative Examples 1 2.80 1.20 0.25 0 Surplus
Embodiment 1 2.80 1.20 0.25 0.05 Surplus
Embodiment 2 2.80 1.20 0.25 0.1 Surplus
Embodiment 3 2.80 1.20 0.25 0.5 Surplus
Embodiment 4 2.80 1.20 0.25 1.0 Surplus
Table 2 (elongation after fracture)
Temperature (℃) Room temperature 100 200 300
Comparative Examples 1 13% 34% 44% 50%
Embodiment 1 40% 82% 110% 130%
Embodiment 2 45% 87% 118% 139%
Embodiment 3 60% 101% 145% 205%
Embodiment 4 51% 91% 123% 145%
Data according to above-mentioned table 1-2 can be found out; After in the wrought magnesium alloys raw material, adding boron; The room temperature tension set of prepared wrought magnesium alloys and high temperature elongation after fracture all rise to some extent; The temperature-room type plasticity and the high-temp plastic that prove absolutely wrought magnesium alloys all increase, even under hot conditions, show the superplasticity characteristic.And; Along with the increase gradually of boron content, the plasticity of magnesiumalloy shows as the characteristic that raises and afterwards reduce earlier, when the addition of boron is 0.3-0.5wt%; The room temperature tension set and the high temperature elongation after fracture of magnesiumalloy are mxm., and plasticity is put up the best performance.
In addition, comparison diagram 1, Fig. 2 and Fig. 3, wherein Fig. 1 is not for adding the wrought magnesium alloys of boron, and Fig. 2 and Fig. 3 then are the wrought magnesium alloys behind the interpolation boron, and Fig. 2 is a room temperature condition, and Fig. 3 then is a hot conditions.From figure, can obviously find out, in magnesiumalloy, add obviously refinement magnesiumalloy crystal grain of boron; And the magnesiumalloy crystal grain under the hot conditions is obviously carefully a lot of than the alloy grain under the room temperature condition again.Prove absolutely that more than wrought magnesium alloys of the present invention has the characteristics of high-ductility; Particularly preferable high-temp plastic; Can satisfy the needs that magnesiumalloy carried out plastic working, can be through the wrought magnesium alloys product of multiple plastic working mode (especially extrusion molding) moulding high comprehensive performance.

Claims (12)

1. a wrought magnesium alloys is characterized in that, the weight percent of each component is in the said wrought magnesium alloys: Al:2.0wt%-4.0wt%; Zn:0.40wt%-1.70wt%; Mn:0.20wt%-0.50wt%; B:0.05wt%-1.0wt%; Surplus comprises Mg, contain or free from foreign meter.
2. wrought magnesium alloys according to claim 1 is characterized in that the weight percent of each component is in the said wrought magnesium alloys: Al:2.50wt%-3.20wt%; Zn:1.0wt%-1.50wt%; Mn:0.25wt%-0.35wt%; B:0.3wt%-0.7wt%; Surplus is Mg.
3. wrought magnesium alloys according to claim 1 and 2 is characterized in that, the weight percent of said B element is 0.3wt%-0.5wt%.
4. wrought magnesium alloys according to claim 1; It is characterized in that; Said impurity is one or more among Si, Fe, Cu, the Ni; Gross weight with wrought magnesium alloys is a benchmark, and the weight percent of each impurity element is: 0≤Si≤0.05wt%, 0≤Fe≤0.004wt%, 0≤Cu≤0.01wt%, 0≤Ni≤0.001wt%.
5. a method for preparing like any one wrought magnesium alloys of claim 1-4 may further comprise the steps: the raw material magnesium alloy of formula ratio is made said wrought magnesium alloys through molten alloyization, refining, cast; It is characterized in that said raw material magnesium alloy comprises: magnesium ingot, aluminium ingot, zinc ingot metal, aluminium manganese master alloy and boron ingot and/or aluminium boron master alloy; Wherein, the weight percent of each component is: Al:2.0wt%-4.0wt%; Zn:0.40wt%-1.70wt%; Mn:0.20wt%-0.50wt%; B:0.05wt%-1.0wt%; Surplus is Mg and impurity element.
6. the preparation method of wrought magnesium alloys according to claim 5; It is characterized in that; Before said molten alloy step, raw material is carried out drying treatment; Wherein, magnesium ingot, aluminium ingot, zinc ingot metal are dry under 100 ± 10 ℃ temperature, and aluminium manganese master alloy, boron ingot and/or aluminium boron master alloy are dry under 150 ± 5 ℃ temperature.
1), fusing 7. the preparation method of wrought magnesium alloys according to claim 5 is characterized in that, said molten alloy step comprises:: earlier crucible is preheated to 300-350 ℃; Put into magnesium ingot, aluminium ingot, zinc ingot metal and add end flux heat fused, treat that magnesium ingot, aluminium ingot, zinc ingot metal all after the fusing, add aluminium manganese master alloy; Continue heating, treat the fusing of aluminium manganese master alloy after, stir; Make the middle liquation of magnesiumalloy; Whole melting process is carried out under the protection of SF6 gas, and the time is controlled at 2-6H, and outlet temperature is controlled at 670-690 ℃;
2), consolute: in the middle of magnesiumalloy, add boron ingot and/or aluminium boron master alloy in the liquation, heat fused also stirs, and obtains the magnesiumalloy liquation, and consolute carries out under protection of inert gas, and the time is controlled at 1-20min, and temperature is controlled at 720-750 ℃.
8. the preparation method of wrought magnesium alloys according to claim 5 is characterized in that, said refinement step adds refining agent in the magnesiumalloy liquation that molten alloyization obtains; And stir; Heat up then, temperature is controlled at 690-730 ℃, and refining time is controlled at 30-45min; Be cooled to 660-720 ℃ then and leave standstill 5-20min, obtain magnesium alloy fused mass.
9. the preparation method of wrought magnesium alloys according to claim 5; It is characterized in that the magnesium alloy fused mass of said cast step after with refining injects mould, the demoulding after the moulding; The condition of cast is: in protective atmosphere, carry out; The preheating temperature of mould is 250 ℃ ± 10 ℃, and the temperature of magnesium alloy fused mass is 660-720 ℃, and said protective atmosphere is SF 6, CO 2, N 2, SO 2, in the rare gas element one or more.
10. a wrought magnesium alloys product is characterized in that, said wrought magnesium alloys product is the wrought magnesium alloys extruded bars, adopts to make like any described wrought magnesium alloys of claim 1-4.
11. the preparation method of a wrought magnesium alloys product as claimed in claim 10; It is characterized in that, comprise the steps: that earlier wrought magnesium alloys being carried out homogenizing annealing handles, and places extrusion mould with wrought magnesium alloys then; Push through extrusion machine, obtain the wrought magnesium alloys product.
12. the preparation method according to the wrought magnesium alloys product of claim 11 is characterized in that, the time that said homogenizing annealing is handled is 10-12H; The condition of said extrusion molding is: the preheating temperature of extrusion mould is 350-450 ℃, and extrusion temperature is controlled at 300-450 ℃, and extrusion ratio is controlled at 10: 1-100: 1, and extrusion speed is controlled at 5m/min-20m/min.
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CN104109786B (en) * 2013-04-22 2016-10-05 比亚迪股份有限公司 A kind of magnesium alloy and preparation method thereof
CN104109786A (en) * 2013-04-22 2014-10-22 比亚迪股份有限公司 Mg alloy and preparation method thereof
CN103290288B (en) * 2013-06-26 2015-10-07 重庆大学 A kind of low cost high-ductility wrought magnesium alloy and preparation method thereof
CN103290288A (en) * 2013-06-26 2013-09-11 重庆大学 Low-cost and high-ductility wrought magnesium alloy and preparation method thereof
CN103451844B (en) * 2013-09-09 2015-06-10 无锡福镁轻合金科技有限公司 Yarn guide plate for patternbars of warp knitting machine
CN103451844A (en) * 2013-09-09 2013-12-18 无锡福镁轻合金科技有限公司 Yarn guide plate for patternbars of warp knitting machine
WO2015180616A1 (en) * 2014-05-27 2015-12-03 Byd Company Limited Al-mg alloy plate, method of preparing the same and use thereof
WO2016071694A3 (en) * 2014-11-05 2016-07-07 Brunel University Grain refiner for magnesium alloys
CN107075613A (en) * 2014-11-05 2017-08-18 布鲁内尔大学 grain refiner for magnesium alloy
CN104775063A (en) * 2015-05-04 2015-07-15 鹤壁市金利达线材有限公司 High-temperature-creep-resistant high-thermal-conductivity high-power LED magnesium alloy heat radiator and manufacturing method thereof
CN105537865A (en) * 2015-12-15 2016-05-04 青海柴达木青元泛镁科技有限公司 Preparation method of light bicycle frame with high strength and low density
CN105537865B (en) * 2015-12-15 2019-03-26 青海柴达木青元泛镁科技有限公司 A kind of preparation method of high-intensitive, low-density lightweight cycle frame
CN108642311A (en) * 2018-05-15 2018-10-12 张建华 A kind of preparation method of magnesium alloy materials

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