CN105463281A - High-strength light metal and preparation method thereof - Google Patents
High-strength light metal and preparation method thereof Download PDFInfo
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- CN105463281A CN105463281A CN201610026097.2A CN201610026097A CN105463281A CN 105463281 A CN105463281 A CN 105463281A CN 201610026097 A CN201610026097 A CN 201610026097A CN 105463281 A CN105463281 A CN 105463281A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
- C22C23/04—Alloys based on magnesium with zinc or cadmium as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/10—Alloys containing non-metals
- C22C1/1036—Alloys containing non-metals starting from a melt
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
- C22C30/06—Alloys containing less than 50% by weight of each constituent containing zinc
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/0047—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents
- C22C32/0052—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents only carbides
- C22C32/0063—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents only carbides based on SiC
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
Abstract
The invention provides high-strength low-density light metal and a preparation method thereof. The metal is magnesium-based alloy and is prepared from, by mass, 3%-20% of zinc, 3%-8% of aluminum, 1%-3% of neodymium, 15%-25% of nano silicon carbide and the balance magnesium. The average diameter of silicon carbide is 200 nanometers or below, the average grain of the magnesium alloy is 100 nanometers or below, and the yield strength of the alloy can reach 400 MPa or above. The magnesium alloy is prepared through the steps of melting, doping of nano particles, dispersion, cooling, distortion, asymmetrical rolling and the like.
Description
Technical field
The present invention relates to a kind of high-strength light metal and preparation method thereof, high-performance magnesium-alloy of especially a kind of SiC reinforcement and preparation method thereof.
Background technology
Magnesium alloy be a kind of density very little metallic substance, apply in the fields such as hand-hold electronic equipments, automobile, aerospace at present.As engineering materials, people expect the material of high strength usually, but due to the atomic structure feature of magnesium alloy, its plasticity is poor, and traditional processing means can not obtain the magnesium alloy of high strength, and the intensity of current magnesium alloy is general lower.
Chinese patent 103589920A discloses a kind of magnalium and preparation method thereof.The composition of this alloy and weight percent are: scandium 1.2 ~ 2.5%, cerium 0.3% ~ 0.8%, manganese 1.5% ~ 2%, molybdenum 2.5% ~ 5%, tungsten 0.12 ~ 1.2%, magnesium 25% ~ 35%, add aluminium to 100%.Compared with prior art, the beneficial effect that the present invention has is: in sum, by the scandium, the cerium that add, manganese, molybdenum, tungsten, makes this magnalium have the advantage of low cost high durability in the present invention.
Chinese patent 102080174A discloses a kind of production method of high Mg-Al alloy plate.This invention solves the problem that tensile strength is low, Mechanical Fluctuation is large, yield rate is low of coarse grains, material in the sheet material of the manufacture method of existing high Mg-Al alloy plate.Present method: in this magnalium sheet material, the mass percent of element is Mg:8.3% ~ 9.6%, Mn:0.4% ~ 0.8%, Ti:0.05% ~ 0.15%, Si :≤0.3%, Fe :≤0.3%, Cu :≤0.05%, Ni :≤0.10%, Zn :≤0.20%, surplus is Al, this alloy obtains high Mg-Al alloy plate after melting, casting, secondary hot rolling, process annealing, cold rolling, finished products, aligning, sawing.Yield rate 48% ~ 55%, intensity 390MPa ~ 400MPa, can be used for space transporter structural part and ordnance missile bullet.
Chinese patent 101880788A discloses a kind of SiC particle grinding Enhancement Method of magnalium, this invention with coloured light metal magnalium for matrix, be strengthen doping agent with silicon-carbide particle, pass through melting, to mill shearing, casting, thermal treatment, finally make magnalium+silicon carbide alloys ingot matrix material, the mechanical property of magnalium+silicon carbide alloys ingot, tensile strength, yield strength, Young's modulus increases substantially, tensile strength can improve 32%, yield strength can improve 40%, Young's modulus can improve 70%, metallographic structure compactness is good, even particle distribution, between wild phase and matrix, interface cohesion is tight, this Enhancement Method is rationally advanced, technical process is short, industrialization continuous seepage can be carried out, it is the very good method preparing enhancement type non-ferrous metal matrix material.
Chinese patent 101177752 proposes a kind of magnesium-zinc-lanthanon alloy containing zinc 4.5% and preparation method thereof, particularly relates in magnesium-zincium-rare earth system to add Magnuminium of heavy rare earth yttrium or gadolinium and light rare earths lanthanum or neodymium and preparation method thereof.The magnesium-zinc-lanthanon alloy of interpolation four kinds of rare earths that this invention provides is respectively MG-4.5WT%ZN-(0.2WT% ~ 2WT%) LA; MG-4.5WT%ZN-(0.2WT% ~ 2WT%) ND; MG-4.5WT%ZN-(0.2WT% ~ 4.8WT%) GD and MG-4.5WT%ZN-(0.2WT% ~ 2.8WT%) Y, can solve the problem of industrial alternative magnesium-zincium-rare earth system alloy kind few and rare earth resources Selection utilization or alternative usability difference.But, its yield strength is at below 200MPa.
More than invent the performance particularly strength property being all devoted to improve magnesium alloy, but, its yield strength is all at 300 ~ below 400MPa, and its intensity and current long engineering materials also have larger gap.
Summary of the invention:
Goal of the invention: in order to expand the Application Areas of magnesium alloy, plays that it is a little low-density, the invention provides a kind of high-strength magnesium alloy and preparation method thereof.
Technical scheme of the present invention is as follows:
Alloying constituent of the present invention is as follows: zinc weight percent content is 3-20%; Aluminium massfraction is 3-8%; Neodymium massfraction is 1-3%; The massfraction of nanometer silicon carbide is 15-25%; Surplus is magnesium.Wherein the mean diameter of silicon carbide is below 200 nanometers.In the process of melting, in magnesium alloy, mix SiC nano particle, be uniformly dispersed, Slow cooling also vacuumizes and allows nano particle improve concentration further, then under high pressure adopts the mode of torsional deformation, then adopts asymmetrical rolling, further crystal grain thinning, puies forward heavy alloyed intensity.According to the present invention, a kind of high-strength magnesium alloy of nano-particle reinforcement can be prepared.Average crystal grain diameter in its microstructure is below 100 nanometers, and the diameter of nano particle is below 200 nanometers, and the yield strength of magnesium alloy is at more than 400MPa.
Concrete preparation method comprises the following steps:
(1) raw material is prepared: prepare high purity magnesium, zinc, aluminium, the neodymium of more than 99.9%, and median size is the nano SiC of below 200 nanometers;
(2) molten alloy: by magnesium, zinc, aluminium, neodymium according to certain atomic ratio batching, melting in protective atmosphere, adds nano SiC in fusion process, maintains the temperature at 700 ° of C, adopts ultrasonic method to disperse;
(3) involutory ingot carries out Slow cooling, and keep vacuumizing state in the process of cooling, low vacuum is in 5torr;
(4), after cooling, alloy pig is processed into discoid;
(5) space that the groove coarse-grain alloy disks that step (4) processes being put into upper and lower two pressure anvils is formed, alloy applies high pressure, and rotates pressure anvil to reverse alloy disks, makes it the deformation that is distorted;
(6) start Multi-functional rolling system, the speed ratio of setting top and bottom rolls, speed ratio is 1.1-1.5; Setting each rolling deformation amount is 1-8%; The speed of setting low speed roller is 0.5-2 meter per second;
(7) start main driving motor, start the operation of rolling;
(8), after treating a rolling, (2) (3) process more than 15 times is repeated;
(9) full annealed thermal treatment is carried out.
Wherein, the shielding gas in step (1) is CO
2with the mixed gas of SF6, in step (3), speed of cooling is less than 0.5k per second; The pressure that step (5) interalloy bears is 1.5-5GPa; Speed of rotation per minute 2 ~ 5 turns, rotates altogether 3-20 circle; Rolling temperature in step (8) is room temperature: the recrystallization temperature in step (9) is 1/3 ~ 1/4 of the fusing point of magnesium, time 3-20 minute.
As preferably, CO
250:1 ~ 100:1 with the scope of the volume ratio of SF6.
As preferably, the granularity average out to 60-120 nanometer of the silicon carbide adopted.
Due in fusion process and process of cooling subsequently, the loss of different element is different, and therefore, the alloying element content added before actual melting should be different from the constituent content of subject alloy.
Useful effect:
The present invention adopts the particle of the nanometer silicon carbide of high strength as enhanced granule, and silicon carbide fusing point is high, is hard particle, not only can plays the effect of crystal grain thinning, and as the obstacle of dislocation motion, can stop the dislocation moving of metal, thus reinforced metal; Meanwhile, crystal grain thinning can play the effect improving alloy plasticity.
The present invention carries out ultrasonic disperse under adopting high temperature metal liquid state, efficiently solves nano particle and is difficult to finely dispersed problem in a metal.Ultrasonic disperse is used under liquid metal state, can be even by nanoparticulate dispersed, to solve the defect that in the technology such as conventional hybrid, stirring, nanoparticulate dispersed is bad.This clearly solves nano particle and disperses difficult problem in a metal.Adopt Slow cooling after melting, keep vacuum tightness simultaneously, the metallic vapor of magnesium can be made constantly to be drawn out of, reduce the content of magnesium in alloy, thus improve the volume fraction of nano particle in alloy, strengthen the effect of reinforced by nanoparticles further.In addition, the present invention also adds a small amount of rear earth element nd, forms rare-earth phase, increases the intensity of alloy further.
In the process applying high pressure twist distortion, crystal grain larger in alloy substrate is broken down into more tiny nanocrystal.In addition, the present invention adopts asymmetrical rolling to process further material, this rolling method can crystal grain thinning further, and the distribution of thickness crystal grain can be formed at organization internal, this material structure can reach carries on the back work hardening greatly, this is non-existent in the material of even grained or the material of conventional machining, can play extra strengthening effect.The present invention adopts micro Process, multi-pass, is suitable for obtaining destination organization.The average crystal grain diameter of final alloy is generally below 100 nanometers, and according to Hall-join strange relation, crystal grain becomes tiny, and the intensity of alloy can be made higher, meanwhile, also can improve the plasticity of alloy.By magnesium alloy prepared by the present invention, its yield strength up to more than 400MPa, can possess excellent plasticity simultaneously, can be applied to the field such as automobile, space flight and aviation.
Embodiment
Describe preparation method of the present invention in detail below by embodiment, but be not construed as limiting the invention.
Embodiment 1
(1) raw material is prepared: prepare high purity magnesium, aluminium, zinc, the neodymium of more than 99.9%, and median size is the nano SiC of 110;
(2) molten alloy: magnesium, aluminium, zinc, neodymium, silicon carbide are prepared burden, at CO according to the mass ratio of 77%, 10%, 2%, 1%, 10%
2with melting in the mixed gas of SF6, wherein CO
2100:1 with SF6 volume ratio; Add nano SiC in fusion process, maintain the temperature at 700 ° of C, adopt ultrasonic method to disperse;
(3) involutory ingot carries out Slow cooling, speed of cooling 0.2k per second; Keep vacuumizing state, vacuum tightness 4torr in the process of cooling;
(4), after cooling, alloy pig is processed into discoid;
(5) space that the groove coarse-grain alloy disks that step (4) processes being put into upper and lower two pressure anvils is formed, alloy applies 5GPa high pressure, and rotate pressure anvil to reverse alloy disks with the speed of per minute 2 turns, make it the deformation that is distorted, rotation 3 is enclosed altogether;
(6) start Multi-functional rolling system, the speed ratio of setting top and bottom rolls, speed ratio is 1.5; Setting each rolling deformation amount is 3%; The speed of setting low speed roller is 2 meter per seconds;
(7) start main driving motor, start the operation of rolling;
(8), after treating a rolling, (6) (7) process 20 times are repeated;
(9) full annealed thermal treatment is carried out at 170 degrees Celsius, 20 minutes time.
Carry out composition analysis to the alloy of melting, result is: aluminium: 7.3%; Zinc: 3.6%; Neodymium: 1.9%; Silicon carbide: 18.5%.Surplus is magnesium.
Embodiment 2
(1) raw material is prepared: prepare high purity magnesium, aluminium, zinc, the neodymium of more than 99.9%, and median size is the SiC of 80 nanometers;
(2) molten alloy: magnesium, aluminium, zinc, neodymium, silicon carbide are prepared burden, at CO according to the mass ratio of 73.7%, 5%, 8%, 1.3%, 12%
2with melting in the mixed gas of SF6, wherein CO
280:1 with SF6 volume ratio; Add nano SiC in fusion process, maintain the temperature at 700 ° of C, adopt ultrasonic method to disperse;
(3) involutory ingot carries out Slow cooling, speed of cooling 0.4k per second; Keep vacuumizing state, vacuum tightness 5torr in the process of cooling;
(4), after cooling, alloy pig is processed into discoid;
(5) space that the groove coarse-grain alloy disks that step (4) processes being put into upper and lower two pressure anvils is formed, alloy applies 1.5GPa high pressure, and rotate pressure anvil to reverse alloy disks with the speed of per minute 3 turns, make it the deformation that is distorted, rotation 10 is enclosed altogether;
(6) start Multi-functional rolling system, the speed ratio of setting top and bottom rolls, speed ratio is 1.3; Setting each rolling deformation amount is 2%; The speed of setting low speed roller is 2 meter per seconds;
(7) start main driving motor, start the operation of rolling;
(8), after treating a rolling, (6) (7) process 20 times are repeated;
(9) full annealed thermal treatment is carried out at 180 degrees Celsius, 3 minutes time.
Carry out composition analysis to the alloy of melting, result is: aluminium: 4.5%; Zinc: 15.2%; Neodymium: 2.5%; Silicon carbide: 21.8%.Surplus is magnesium.
Embodiment 3
(1) raw material is prepared: prepare high purity magnesium, aluminium, zinc, the neodymium of more than 99.9%, and median size is the SiC of 60 nanometers;
(2) molten alloy: magnesium, aluminium, zinc, neodymium, silicon carbide are prepared burden, at CO according to the mass ratio of 78.3%, 6%, 6%, 0.7%, 9%
2with melting in the mixed gas of SF6, wherein CO
250:1 with SF6 volume ratio; Add nano SiC in fusion process, maintain the temperature at 700 ° of C, adopt ultrasonic method to disperse;
(3) involutory ingot carries out Slow cooling, speed of cooling 0.5k per second; Keep vacuumizing state, vacuum tightness 3torr in the process of cooling;
(4), after cooling, alloy pig is processed into discoid;
(5) space that the groove coarse-grain alloy disks that step (4) processes being put into upper and lower two pressure anvils is formed, alloy applies 1.5GPa high pressure, and rotate pressure anvil to reverse alloy disks with the speed of per minute 2 turns, make it the deformation that is distorted, rotation 20 is enclosed altogether;
(6) start Multi-functional rolling system, the speed ratio of setting top and bottom rolls, speed ratio is 1.4; Setting each rolling deformation amount is 3%; The speed of setting low speed roller is 2 meter per seconds;
(7) start main driving motor, start the operation of rolling;
(8), after treating a rolling, (6) (7) process 25 times are repeated;
(9) full annealed thermal treatment is carried out at 190 degrees Celsius, 10 minutes time.
Carry out composition analysis to the alloy of melting, result is: aluminium: 4.9%; Zinc: 10.2%; Neodymium: 1.3%; Silicon carbide: 16.2%.Surplus is magnesium.
Embodiment 4
(1) raw material is prepared: prepare high purity magnesium, aluminium, zinc, the neodymium of more than 99.9%, and median size is the SiC of 150 nanometers;
(2) molten alloy: magnesium, aluminium, zinc, neodymium, silicon carbide are prepared burden, at CO according to the mass ratio of 78.3%, 8%, 4%, 0.9%, 8%
2with melting in the mixed gas of SF6, wherein CO
250:1 with SF6 volume ratio; Add nano SiC in fusion process, maintain the temperature at 700 ° of C, adopt ultrasonic method to disperse;
(3) involutory ingot carries out Slow cooling, speed of cooling 0.2k per second; Keep vacuumizing state in the process of cooling, low vacuum is in 4torr;
(4), after cooling, alloy pig is processed into discoid;
(5) space that the groove coarse-grain alloy disks that step (4) processes being put into upper and lower two pressure anvils is formed, alloy applies 2GPa high pressure, and rotate pressure anvil to reverse alloy disks with the speed of per minute 2 turns, make it the deformation that is distorted, rotation 20 is enclosed altogether;
(6) start Multi-functional rolling system, the speed ratio of setting top and bottom rolls, speed ratio is 1.1; Setting each rolling deformation amount is 8%; The speed of setting low speed roller is 0.5 meter per second;
(7) start main driving motor, start the operation of rolling;
(8), after treating a rolling, (6) (7) process 23 times are repeated;
(9) full annealed thermal treatment is carried out at 180 degrees Celsius, 8 minutes time.
Carry out composition analysis to the alloy of melting, result is: aluminium: 6.3%; Zinc: 13.8%; Neodymium: 1.5%; Silicon carbide: 15.3%.Surplus is magnesium.
Performance Detection: carry out tensile test at room temperature, obtains the yield strength of alloy prepared by each embodiment; Adopt TEM (transmission electron microscope) analysis, obtain the crystal grain diameter of alloy; Atomic absorption spectrochemical analysis is adopted to obtain the atomic ratio of magnesium zinc; Result is as following table:
Can see from upper table, adopt the present invention, the yield strength of prepared magnesium alloy, at more than 400MPa, is much higher than prior art level.
The above is only some examples of embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (6)
1. a high-strength light metal, is characterized in that: this magnesium alloy is made up of magnesium, zinc, aluminium, neodymium element and nanometer silicon carbide; Zinc weight percent content is 3-20%; Aluminium massfraction is 3-8%; Neodymium massfraction is 1-3%; The massfraction of nanometer silicon carbide is 15-25%; Surplus is magnesium; The mean diameter of silicon carbide is below 200 nanometers, and the average crystal grain of magnesium alloy is below 100 nanometers, and the yield strength of alloy is at more than 400MPa.
2. magnesium alloy as claimed in claim 1, its manufacture method comprises following steps:
(1) prepare raw material: the high purity magnesium, zinc, aluminium, the neodymium metal that prepare purity more than 99.9%, and median size is the nano SiC of below 200 nanometers;
(2) molten alloy: by above according to certain atomic ratio batching, melting in protective atmosphere, adds nano SiC in fusion process, maintains the temperature at 700 ° of C, adopts ultrasonic method to disperse;
(3) involutory ingot carries out Slow cooling, and keep vacuumizing state in the process of cooling, low vacuum is in 5torr;
(4), after cooling, alloy pig is processed into discoid;
(5) space that the groove coarse-grain alloy disks that step (4) processes being put into upper and lower two pressure anvils is formed, alloy applies high pressure, and rotates pressure anvil to reverse alloy disks, makes it the deformation that is distorted;
(6) start Multi-functional rolling system, the speed ratio of setting top and bottom rolls, speed ratio is 1.1-1.5; Setting each rolling deformation amount is 1-8%; The speed of setting low speed roller is 0.5-2 meter per second;
(7) start main driving motor, start the operation of rolling;
(8), after treating a rolling, (2) (3) process more than 15 times is repeated;
(9) full annealed thermal treatment is carried out.
3. the preparation method of magnesium alloy as claimed in claim 2, is characterized in that: shielding gas is CO
2with the mixed gas of SF6.
4. the preparation method of magnesium alloy as claimed in claim 2, is characterized in that: speed of cooling is less than 0.5k per second.
5. the preparation method of magnesium alloy as claimed in claim 2, is characterized in that: the pressure that alloy bears is 1.5-5GPa, speed of rotation per minute 2 ~ 5 turns.
6. magnesium alloy preparation method as claimed in claim 2, is characterized in that: described rolling temperature is room temperature.
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| CN107488801B (en) * | 2017-09-05 | 2018-04-13 | 河北工业大学 | A kind of automotive hub high strength anti-corrosion composite material of magnesium alloy and preparation method thereof |
| CN114369741A (en) * | 2022-01-04 | 2022-04-19 | 湖南化工职业技术学院（湖南工业高级技工学校） | SiC inoculation treatment process of Mg-3.0Zn medical magnesium alloy |
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| CN107488801B (en) * | 2017-09-05 | 2018-04-13 | 河北工业大学 | A kind of automotive hub high strength anti-corrosion composite material of magnesium alloy and preparation method thereof |
| CN114369741A (en) * | 2022-01-04 | 2022-04-19 | 湖南化工职业技术学院（湖南工业高级技工学校） | SiC inoculation treatment process of Mg-3.0Zn medical magnesium alloy |
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