CN102383012B - Low-rare-earth high-strength heat-resisting magnesium alloy and preparation method thereof - Google Patents
Low-rare-earth high-strength heat-resisting magnesium alloy and preparation method thereof Download PDFInfo
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Abstract
The invention relates to high-strength heat-resisting magnesium alloy, comprising the following components: Sn, Y, Gd, Mn, Zr, and the balance of Mg. A preparation method comprises the following steps of: weighing a drilled magnesium ingot, Mn powder, Mg-Y intermediate alloy, Mg-Gd intermediate alloy and Mg-Zr intermediate alloy, filling the sieved Mn powder into holes of the magnesium ingot, spreading a flux for melting together, then adding the intermediate alloy, stirring, rising the temperature, adding the Mg-Zr intermediate alloy, stirring, rising the temperature, adding a Sn ingot, stirring, and obtaining alloy liquid; carrying out refining on the alloy liquid, then pouring the alloy liquid into a preheated metal mold, cooling and obtaining an alloy casting ingot; and carrying out heat preservation and quenching on the casting ingot, then carrying out aging, and finally preparing a rod or a plate. The high-strength heat-resisting magnesium alloy has excellent room-temperature high-strength toughness and high-temperature tensile performance, and simultaneously has better plastic deformability and hot-working performance, and the creep resistance is improved by addition of Mn and Zr.
Description
Technical field
The invention belongs to metallic substance and metallurgical technology field, relate to a kind of low rare-earth high-strength heat-resisting magnesium alloy and preparation method thereof.
Background technology
Magnesium alloy is the lightest practical metallic substance, and density is only 1.35～1.8g/cm
3, have high specific tenacity and specific rigidity, good diamagnetism, high electronegativity and thermal conductivity, good shock absorbing and machinability.Become the preferred material of the industries such as Hyundai Motor, portable electronic products electronics, communication, but the intensity of magnesium alloy generally speaking all lower than aluminium alloy in addition, high-temperature behavior is poor is also the one of the main reasons that hinders the magnesium alloy widespread use, when temperature raises, its intensity and creep-resistant property often significantly descend, thereby it is difficult to greatly limit its application as the long-time parts that use of high temperature.So by adding a certain amount of high-melting-point element and magnesium matrix to form the high-melting-point phase in alloy, and obtaining homogeneous chemical composition, fine microstructures by rational thermal treatment process, the excellent and comprehensive good magnesium alloy of mechanical property of high-temperature behavior becomes the important research direction in magnesium alloy field.
Mainly study from aspects such as rare earth element alloy reinforcement, magnesium base complex intensifying and Rapid Solidification Powder metallurgy method both at home and abroad at present, to improve room temperature strength and the hot strength of magnesium alloy.Wherein the magnesium alloy for preparing the high-temperature behavior excellence of the mode take rare earth element as main added elements is occupied manyly, and they often reach preparation high-strength heat-resistant magnesium alloy purpose by adding a kind or 2 kinds and above rare earth.The disclosed patent of Li Daquan " high-strength heat-resisting magnesium alloy and preparation method thereof " (application number: 200610024085.2, publication number: CN1814837A, open day: 2006.8.9) the alloy structure composition of the high-strength heat-resistant magnesium alloy of its preparation was 12%Y, 2%Sm, 0.35%Zr, surplus is Mg and other.After heat treatment, its room temperature tensile strength is 365MPa, and unit elongation is that the tensile strength of 3.0%, 200 ℃ is 331MPa, and the tensile strength of 250 ℃ is 312MPa.What upper bright disclosed patent " high-strength heat-resisting magnesium alloy and preparation method thereof " (application number: 200510025251.6, publication number: CN1676646A, open day: 2005.10.5) content of the high-strength heat-resisting magnesium alloy middle-weight rare earths of its preparation was 6-15%Gd, 1-6%Y, and intensity and the high-temperature behavior of alloy are fine.The people such as Xiao Yang (Xiao Yang, Zhang Xinming, the performance of high-strength temperature-resistant Mg-9Gd-4Y-0.5Zr alloy. Central South University's journal, 2006,37 (5): 850-854) the Mg-9Gd-4Y-0.5Zr alloy of preparation has also obtained intensity and high-temperature behavior preferably.But the alloy that relates in above-mentioned disclosed patent and document all adopts the rare earth element of high level, and rare earth element is not only expensive, and than great, the material cost that will cause for preparing high-strength heat-resistant magnesium alloy by adding high rare-earth content significantly improves.The disclosed patent in little open country prosperous two (Japan) " magnesium base composite material that contains Al2Ca " (application number: 200980108474.5, publication number: CN101970703A, open day: 2011.02.09), the magnesium base composite material of preparation all had excellent strength characteristics under normal temperature and high temperature.Yuan Guang silver disclosed patent " strong magnesium alloy of rapid solidification superelevation and preparation method thereof " (application number: 200910049871.1, publication number: CN101538671A, open day: 2009.9.23), utilize flash set technology also to prepare high-strength magnesium alloy.But due to apparatus expensive, no matter complicated process of preparation adopts magnesium base complex intensifying still to adopt the cost of high-strength heat-resistant magnesium alloy of flash set technology preparation high, expensive, the industrialization difficulty.
Summary of the invention
The purpose of this invention is to provide a kind of low rare-earth high-strength heat-resisting magnesium alloy, solved the problem of magnesium alloy strength and creep-resistant property deficiency under hot conditions.
Another object of the present invention is to provide a kind of preparation method of low rare-earth high-strength heat-resisting magnesium alloy, has solved present magnesium alloy complicated process of preparation, the problem that preparation cost is high.
The technical solution adopted in the present invention is, a kind of high-strength heat-resistant magnesium alloy, and it consists of by mass percentage: Sn:3-6%, Y:0-4%, Gd:0-4%, Mn:0.5-2.5%, Zr≤1.0%, all the other are Mg.
Another kind of technical scheme of the present invention is, the preparation method of the described magnesium alloy of a kind of claim 1 implements according to following steps:
Step 1, take respectively magnesium ingot, Mn powder, Mg-Y master alloy, Mg-Gd master alloy and the Mg-Zr master alloy of boring in advance, make that between each material, relationship between quality satisfies following mass percent: Sn:3-6%, Y:0-4%, Gd:0-4%, Mn:0.5-2.5%, Zr≤1.0%, all the other are Mg;
step 2, the Mn powder that step 1 is taken is crossed to insert on magnesium ingot after the 50-200 mesh sieve and is bored in advance in good hole, 5%-10% according to required preparation alloy mass takes flux, sprinkle flux on magnesium ingot, and together put into well formula resistance furnace and heat, magnesium ingot is melted and make the magnesium liquid temp rise to 720-740 ℃, then add one or both in Mg-Y master alloy and Mg-Gd master alloy, mechanical stirring 10 minutes, then the magnesium liquid temp is risen to 780-800 ℃, add the Mg-Zr master alloy, mechanical stirring is 10 minutes afterwards, at last magnesium liquid is cooled to 730-750 ℃, added technical pure Sn ingot and mechanical stirring 10 minutes, obtain aluminium alloy,
Step 3, the aluminium alloy temperature that step 2 is made rises to 750-780 ℃ and carries out refining treatment, then the aluminium alloy temperature is adjusted to 740 ℃, pours into preheating temperature and is in the bottom filling metal mold of 300 ℃ ± 10 ℃, obtains alloy cast ingot after being cooled to normal temperature;
Step 4, the ingot casting that step 3 is obtained is incubated 6-18 hour at the temperature of 450-520 ℃, afterwards by cold water or oil quenching, then be incubated 8-24 hour ageing treatment at the temperature of 200-260 ℃, at last by extruding or rolling bar or the sheet material made.
Characteristics of the present invention also are,
Flux described in step 2 adopts industrial RJ-2 flux.
In step 4, the temperature of cold water or oil is normal temperature.
Beneficial effect of the present invention is, use common founding can prepare cheap high-strength heat-resistant magnesium alloy, this magnesium alloy not only has excellent room temperature high-strong toughness and high temperature tensile properties, have simultaneously plastic deformation ability and hot workability preferably, and owing to having added Mn and Zr element, thereby improved the creep-resistant property of alloy.
Embodiment
The present invention is described in detail below in conjunction with embodiment.
The invention provides a kind of high-strength heat-resistant magnesium alloy, it consists of by mass percentage: Sn:3-6%, and Y:0-4%, Gd:0-4%, Mn:0.5-2.5%, Zr≤1.0%, all the other are Mg.
The present invention also provides the preparation method of above-mentioned magnesium alloy, implements according to following steps:
Step 1, take respectively magnesium ingot, Mn powder, Mg-Y master alloy, Mg-Gd master alloy and the Mg-Zr master alloy of boring in advance, make that between each material, relationship between quality satisfies following mass percent: Sn:3-6%, Y:0-4%, Gd:0-4%, Mn:0.5-2.5%, Zr≤1.0%, all the other are Mg;
Step 2, the Mn powder that step 1 is taken is crossed to insert on magnesium ingot after the 50-200 mesh sieve and is bored in advance in good hole, sprinkle industrial RJ-2 flux on magnesium ingot, and together put into well formula resistance furnace and heat, magnesium ingot is melted and make the magnesium liquid temp rise to 720-740 ℃, then added Mg-Y or Mg-Gd master alloy mechanical stirring 10 minutes, then the magnesium liquid temp is risen to 780-800 ℃, add the Mg-Zr master alloy, mechanical stirring is 10 minutes afterwards, at last magnesium liquid is cooled to 730-750 ℃, added technical pure Sn ingot and mechanical stirring 10 minutes, obtain aluminium alloy;
Step 3, the aluminium alloy temperature that step 2 is made rises to 750-780 ℃ and carries out refining treatment, then the aluminium alloy temperature is adjusted to 740 ℃, pours into preheating temperature and is in the bottom filling metal mold of 300 ℃ ± 10 ℃, obtains alloy cast ingot after being cooled to normal temperature;
Step 4, the ingot casting that step 3 is obtained is incubated 6-18 hour at the temperature of 450-520 ℃, afterwards by cold water or oil quenching, then be incubated 8-24 hour ageing treatment at the temperature of 200-260 ℃, at last by extruding or rolling bar or the sheet material made.
Embodiment 1
Take respectively magnesium ingot, Mn powder, Mg-Y master alloy and the Mg-Zr master alloy of boring in advance, make satisfied following weight percent: the Sn:3% of relationship between quality between each material, Y:4%, Mn:1.5%, Zr:0.8%, all the other are Mg;
after being crossed the 50-200 mesh sieve, the Mn powder that takes inserts in the hole that on magnesium ingot, brill is good in advance, take flux according to 10% of required preparation alloy mass, sprinkle industrial RJ-2 flux on magnesium ingot, and together put into well formula resistance furnace and heat, magnesium ingot is melted and make the magnesium liquid temp rise to 720 ℃, then added Mg-Y or Mg-Gd master alloy mechanical stirring 10 minutes, then the magnesium liquid temp is risen to 780 ℃, add the Mg-Zr master alloy, mechanical stirring is 10 minutes afterwards, at last magnesium liquid is cooled to 750 ℃, added technical pure Sn ingot and mechanical stirring 10 minutes, obtain aluminium alloy, again the aluminium alloy temperature that makes is risen to 750 ℃ and carry out refining treatment, again the aluminium alloy temperature is adjusted to 740 ℃, pour into preheating temperature and be in the bottom filling metal mold of 300 ℃ ± 10 ℃, obtain alloy cast ingot after being cooled to normal temperature, at last the ingot casting that obtains is incubated 10 hours at the temperature of 500 ℃, cold water or oil quenching, then be incubated 16 hours ageing treatment at the temperature of 210 ℃, at last by extruding or rolling bar or the sheet material made.
The high-strength heat-resistant magnesium alloy of the present embodiment gained, its room temperature tensile strength is 286MPa, unit elongation is 8.2%; Tensile strength under 280 ℃ of conditions is 261MPa, and unit elongation is 17.6%.
Embodiment 2
Take respectively magnesium ingot, Mn powder, Mg-Gd master alloy and the Mg-Zr master alloy of boring in advance, make satisfied following weight percent: the Sn:3% of relationship between quality between each material, Gd:4%, Mn:1.5%, Zr:0.8%, all the other are Mg;
after being crossed the 50-200 mesh sieve, the Mn powder that takes inserts in the hole that on magnesium ingot, brill is good in advance, take flux according to 10% of required preparation alloy mass, sprinkle industrial RJ-2 flux on magnesium ingot, and together put into well formula resistance furnace and heat, magnesium ingot is melted and make the magnesium liquid temp rise to 720 ℃, then added Mg-Y or Mg-Gd master alloy mechanical stirring 10 minutes, then the magnesium liquid temp is risen to 780 ℃, add the Mg-Zr master alloy, mechanical stirring is 10 minutes afterwards, at last magnesium liquid is cooled to 750 ℃, added technical pure Sn ingot and mechanical stirring 10 minutes, obtain aluminium alloy, again the aluminium alloy temperature that makes is risen to 750 ℃ and carry out refining treatment, again the aluminium alloy temperature is adjusted to 740 ℃, pour into preheating temperature and be in the bottom filling metal mold of 300 ℃ ± 10 ℃, obtain alloy cast ingot after being cooled to normal temperature, at last the ingot casting that obtains is incubated 10 hours at the temperature of 500 ℃, cold water or oil quenching, then be incubated 16 hours ageing treatment at the temperature of 210 ℃, at last by extruding or rolling bar or the sheet material made.
The high-strength heat-resistant magnesium alloy of the present embodiment gained, its room temperature tensile strength is 292MPa, unit elongation is 9.8%; Tensile strength under 280 ℃ of conditions is 296MPa, and unit elongation is 19.5%.
Embodiment 3
Take respectively magnesium ingot, Mn powder, Mg-Y master alloy, Mg-Gd master alloy and the Mg-Zr master alloy of boring in advance, make satisfied following weight percent: the Sn:5% of relationship between quality between each material, Y:2%, Gd:2%, Mn:2%, Zr:0.8%, all the other are Mg;
after being crossed the 50-200 mesh sieve, the Mn powder that takes inserts in the hole that on magnesium ingot, brill is good in advance, take flux according to 7% of required preparation alloy mass, sprinkle industrial RJ-2 flux on magnesium ingot, and together put into well formula resistance furnace and heat, magnesium ingot is melted and make the magnesium liquid temp rise to 730 ℃, then added Mg-Y or Mg-Gd master alloy mechanical stirring 10 minutes, then the magnesium liquid temp is risen to 800 ℃, add the Mg-Zr master alloy, mechanical stirring is 10 minutes afterwards, at last magnesium liquid is cooled to 740 ℃, added technical pure Sn ingot and mechanical stirring 10 minutes, obtain aluminium alloy, again the aluminium alloy temperature that makes is risen to 770 ℃ and carry out refining treatment, again the aluminium alloy temperature is adjusted to 740 ℃, pour into preheating temperature and be in the bottom filling metal mold of 300 ℃ ± 10 ℃, obtain alloy cast ingot after being cooled to normal temperature, at last the ingot casting that obtains is incubated 18 hours at the temperature of 450 ℃, cold water or oil quenching, then be incubated 8 hours ageing treatment at the temperature of 200 ℃, at last by extruding or rolling bar or the sheet material made.
The high-strength heat-resistant magnesium alloy of this example gained, its room temperature tensile strength is 301MPa, unit elongation is 11.4%; Tensile strength under 280 ℃ of conditions is 285MPa, and unit elongation is 21.6%.
Embodiment 4
Alloying constituent consists of by weight percentage: 6%Sn, and 4%Y, 2.5%Mn, 0.8%Zr, all the other are Mg and inevitable impurity.
after being crossed the 50-200 mesh sieve, the Mn powder that takes inserts in the hole that on magnesium ingot, brill is good in advance, take flux according to 5% of required preparation alloy mass, sprinkle industrial RJ-2 flux on magnesium ingot, and together put into well formula resistance furnace and heat, magnesium ingot is melted and make the magnesium liquid temp rise to 740 ℃, then added Mg-Y or Mg-Gd master alloy mechanical stirring 10 minutes, then the magnesium liquid temp is risen to 790 ℃, add the Mg-Zr master alloy, mechanical stirring is 10 minutes afterwards, at last magnesium liquid is cooled to 730 ℃, added technical pure Sn ingot and mechanical stirring 10 minutes, obtain aluminium alloy, again the aluminium alloy temperature that makes is risen to 780 ℃ and carry out refining treatment, again the aluminium alloy temperature is adjusted to 740 ℃, pour into preheating temperature and be in the bottom filling metal mold of 300 ℃ ± 10 ℃, obtain alloy cast ingot after being cooled to normal temperature, at last the ingot casting that obtains is incubated 6 hours at the temperature of 520 ℃, cold water or oil quenching, then be incubated 24 hours ageing treatment at the temperature of 260 ℃, at last by extruding or rolling bar or the sheet material made.
The high-strength heat-resistant magnesium alloy of this example gained, its room temperature tensile strength is 265MPa, unit elongation is 10.5%; Tensile strength under 280 ℃ of conditions is 281MPa, and unit elongation is 23.1%.
Embodiment 5
Alloying constituent consists of by weight percentage: 6%Sn, and 4%Gd, 0.5%Mn, 1.0%Zr, all the other are Mg and inevitable impurity.
after being crossed the 50-200 mesh sieve, the Mn powder that takes inserts in the hole that on magnesium ingot, brill is good in advance, take flux according to 10% of required preparation alloy mass, sprinkle industrial RJ-2 flux on magnesium ingot, and together put into well formula resistance furnace and heat, magnesium ingot is melted and make the magnesium liquid temp rise to 720 ℃, then added Mg-Y or Mg-Gd master alloy mechanical stirring 10 minutes, then the magnesium liquid temp is risen to 780 ℃, add the Mg-Zr master alloy, mechanical stirring is 10 minutes afterwards, at last magnesium liquid is cooled to 750 ℃, added technical pure Sn ingot and mechanical stirring 10 minutes, obtain aluminium alloy, again the aluminium alloy temperature that makes is risen to 750 ℃ and carry out refining treatment, again the aluminium alloy temperature is adjusted to 740 ℃, pour into preheating temperature and be in the bottom filling metal mold of 300 ℃ ± 10 ℃, obtain alloy cast ingot after being cooled to normal temperature, at last the ingot casting that obtains is incubated 10 hours at the temperature of 500 ℃, cold water or oil quenching, then be incubated 16 hours ageing treatment at the temperature of 210 ℃, at last by extruding or rolling bar or the sheet material made.
The high-strength heat-resistant magnesium alloy of the present embodiment gained, its room temperature tensile strength is 272MPa, unit elongation is 11.7%; Tensile strength under 280 ℃ of conditions is 295MPa, and unit elongation is 23.9%.
The substantive distinguishing features that the present invention has and significant progress are:
The present invention adds the alloying element with the Sn of cheapness as main, and a certain amount of Sn joins in magnesium alloy, thinning microstructure, and have high high-temperature stability phase Mg with magnesium formation
2Sn phase (770 ℃ of fusing points), and this has very high hardness mutually is to putting forward heavy alloyed room temperature and the high-temperature behavior effect is remarkable.
Middle-weight rare earths Y of the present invention, Gd add with Mg-Y, Mg-Gd master alloy respectively.Y, Gd add the effect that all can play thinning microstructure, and Y, the Gd solid solubility in Mg is very large, can put forward heavy alloyed mechanical property by solution strengthening and aging precipitation precipitation strength.
Add a small amount of Mn, plasticity and the hot workability that the Zr element has not only improved alloy in the present invention, and due to Zr the partial solid solubility in magnesium, Zr can be used as heterogeneous forming core core crystal grain thinning, Mn can also carry heavy alloyed creep-resistant property.
By adjusting each component proportioning, use common founding can prepare cheap high-strength heat-resistant magnesium alloy in the present invention.This magnesium alloy not only has excellent room temperature high-strong toughness and high temperature tensile properties, and has plastic deformation ability and hot workability preferably.Its room temperature tensile strength 250-350MPa, unit elongation 8-15%; Under 280 ℃ of conditions, its tensile strength 230-300MPa, unit elongation 15-26%.
Claims (2)
1. high-strength heat-resistant magnesium alloy, it is characterized in that: it consists of by mass percentage: Sn:5%, Y:2%, Gd:2%, Mn:2%, Zr:0.8%, all the other are Mg.
2. the preparation method of the described magnesium alloy of claim 1, is characterized in that, implements according to following steps:
Step 1 takes respectively magnesium ingot, Mn powder, Mg-Y master alloy, Mg-Gd master alloy and the Mg-Zr master alloy of holing in advance;
step 2, the Mn powder that step 1 is taken is crossed to insert on magnesium ingot after the 50-200 mesh sieve and is bored in advance in good hole, take flux according to 7% of required preparation alloy mass, sprinkle flux on magnesium ingot, and together put into well formula resistance furnace and heat, magnesium ingot is melted and make the magnesium liquid temp rise to 730 ℃, then add Mg-Y master alloy and Mg-Gd master alloy, mechanical stirring 10 minutes, then the magnesium liquid temp is risen to 800 ℃, add the Mg-Zr master alloy, mechanical stirring is 10 minutes afterwards, at last magnesium liquid is cooled to 740 ℃, added technical pure Sn ingot and mechanical stirring 10 minutes, obtain aluminium alloy, make that between each material of aluminium alloy, relationship between quality satisfies following mass percent: Sn:5%, Y:2%, Gd:2%, Mn:2%, Zr:0.8%, all the other are Mg,
Described flux adopts industrial RJ-2 flux;
Step 3, the aluminium alloy temperature that step 2 is made rises to 770 ℃ and carries out refining treatment, then the aluminium alloy temperature is adjusted to 740 ℃, pours into preheating temperature and is in the bottom filling metal mold of 300 ℃ ± 10 ℃, obtains alloy cast ingot after being cooled to normal temperature;
Step 4, the ingot casting that step 3 is obtained is incubated 18 hours at the temperature of 450 ℃, by cold water or the oil quenching of normal temperature, then be incubated 8 hours ageing treatment at the temperature of 200 ℃, at last by extruding or rolling bar or the sheet material made afterwards.
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| CN102676896B (en) * | 2012-05-24 | 2014-07-30 | 狄石磊 | Corrosion resistant magnesium alloy material and preparation method thereof |
| CN104099508B (en) * | 2014-07-28 | 2016-06-29 | 中南大学 | A kind of high-strength and high damping magnesium alloy containing rare earth element |
| CN104711469A (en) * | 2014-10-20 | 2015-06-17 | 西南交通大学 | Heterogeneous high damping magnesium alloy |
| CN104862567B (en) * | 2015-06-09 | 2017-03-22 | 太原科技大学 | Preparation method of high-Sn wrought magnesium alloy panel |
| CN108425052A (en) * | 2018-04-13 | 2018-08-21 | 上海海洋大学 | A kind of heat-resistance high-strength wrought magnesium alloy and preparation method thereof |
| CN108796324A (en) * | 2018-07-03 | 2018-11-13 | 重庆大学 | A kind of room temperature high-ductility magnesium-tin-yttrium-zircaloy and preparation method thereof |
| CN111187998B (en) * | 2020-02-20 | 2021-03-02 | 齐鲁工业大学 | Method for regulating and controlling grain structure of ZK60 deformed magnesium alloy and improving performance |
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| CN1464913A (en) * | 2001-08-13 | 2003-12-31 | 本田技研工业株式会社 | Magnesium alloy |
| CN1676646A (en) * | 2005-04-21 | 2005-10-05 | 上海交通大学 | High-strength heat-resisting magnesium alloy and its preparing method |
| CN1804083A (en) * | 2006-01-23 | 2006-07-19 | 中南大学 | High-strength heat-resistant rare earth magnesium alloy |
| CN101440449A (en) * | 2008-12-23 | 2009-05-27 | 重庆大学 | Multicomponent heat resisting magnesium alloy and preparation thereof |
| CN101831580A (en) * | 2010-04-19 | 2010-09-15 | 哈尔滨工程大学 | Biomedical Mg-Sn-Mn series magnesium alloy and plate rolling process thereof |
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| JPH0247238A (en) * | 1988-08-08 | 1990-02-16 | Nippon Telegr & Teleph Corp <Ntt> | High-damping alloy and its production |
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| CN1464913A (en) * | 2001-08-13 | 2003-12-31 | 本田技研工业株式会社 | Magnesium alloy |
| CN1676646A (en) * | 2005-04-21 | 2005-10-05 | 上海交通大学 | High-strength heat-resisting magnesium alloy and its preparing method |
| CN1804083A (en) * | 2006-01-23 | 2006-07-19 | 中南大学 | High-strength heat-resistant rare earth magnesium alloy |
| CN101440449A (en) * | 2008-12-23 | 2009-05-27 | 重庆大学 | Multicomponent heat resisting magnesium alloy and preparation thereof |
| CN101831580A (en) * | 2010-04-19 | 2010-09-15 | 哈尔滨工程大学 | Biomedical Mg-Sn-Mn series magnesium alloy and plate rolling process thereof |
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