CN104775063B - High-temperature-creep-resistant high-thermal-conductivity high-power LED magnesium alloy heat radiator and manufacturing method thereof - Google Patents
High-temperature-creep-resistant high-thermal-conductivity high-power LED magnesium alloy heat radiator and manufacturing method thereof Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C23/00—Alloys based on magnesium
- C22C23/02—Alloys based on magnesium with aluminium as the next major constituent
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- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
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Abstract
The invention provides a high-temperature-creep-resistant high-thermal-conductivity high-power LED magnesium alloy heat radiator and a manufacturing method thereof. The components include, by mass, 2.5-3.5 percent of Al, 0.4-1.3 percent of Zn, 0.4-2 percent of Sr, 0.2-3 percent of Sn, 0.1-1 percent of B, 0.1-0.8 percent of Mn and the balance Mg. The manufacturing method includes the steps of preparation of furnace charge, preheating of the furnace charge and a mould, smelting, refining, homogenization treatment and extrusion forming, and artificial aging is carried out after extrusion to obtain the high-temperature-creep-resistant high-thermal-conductivity high-power LED magnesium alloy heat radiator. A homogenizing annealing process is adopted in the manufacturing method, the non-uniformity of the components in the condensation process of alloy is improved, the deformation resistance of the alloy is reduced, and deformation machining is carried out conveniently.
Description
Technical field
The present invention relates to a kind of LED magnesium alloy radiator, particularly relate to a kind of high temperature creep-resisting high-heat conductivity and large-power LED magnesium alloy radiator and preparation method thereof.
Background technology
LED(Light Emitting Diode) light emitting diode is more and more extensive in the application of lighting field as " forth generation light source ", but concentrate owing to electric energy is converted to the heat energy output during luminous energy, if the heat energy produced can not export timely and effectively, long-time hot operation can cause LED chip light emitting efficiency to decline, service life shortens and the ability of fluorescent material conversion light fails and causes the problems such as color temperature shift.Therefore the heat dissipation problem of LED lamp becomes field of LED illumination focus of attention, and the high-power development trend of lighting more exacerbates the impact of problem above.Magnesium alloy is as good Heat Conduction Material, and its density is little, specific strength advantages of higher disclosure satisfy that high-power LED illumination lamp radiator lightweight, requirement attractive in appearance.
High-power illumination light fixture operating temperature is high (more than 100 DEG C), and magnesium alloy radiator needs stronger high-temperature creep resistance.For meeting the application demand of high-power LED radiator, heat conductivility is also the key factor of restriction LED magnesium alloy radiator application.Therefore, exploitation has excellent mechanical performances concurrently and heat conductivility LED magnesium alloy radiator is significant.
Summary of the invention
In sum, for above not enough, it is an object of the invention to provide a kind of high temperature creep-resisting high-heat conductivity and large-power LED magnesium alloy radiator and preparation Fang Fafa thereof, solution is conventional, and magnesium alloy radiator toughness is low, it is easy to crack to process, high-temperature creep resistance is low problem, makes LED magnesium alloy radiator take into account the demand of mechanical property and heat conductivility.
In order to achieve the above object, the technical solution used in the present invention is as follows:
A kind of high temperature creep-resisting high-heat conductivity and large-power LED magnesium alloy radiator, its constituent mass percentage ratio is: Al2.5 ~ 3.5%, Zn0.4 ~ 1.3%, Sr0.4 ~ 2%, Sn0.2 ~ 3%, B0.1 ~ 1%, Mn0.1 ~ 0.8%, and remaining is Mg.
A kind of high temperature creep-resisting high-heat conductivity and large-power LED magnesium alloy radiator and preparation Fang Fafa thereof, comprise the steps:
The first step, furnace charge preparation and furnace charge and mould preheating:
Furnace charge prepares: pure magnesium ingot, fine aluminium ingot, pure zinc ingot, pure tin ingot, Mg-25Sr intermediate alloy, pure B block or Al-3B intermediate alloy, Mg-4Mn intermediate alloy as raw material, by Al2.5 ~ 3.5%, Zn0.4 ~ 1.3%, Sr0.4 ~ 2%, Sn0.2 ~ 3%, B0.1 ~ 1%, Mn0.1 ~ 0.8%, remaining is that the element mass percent of Mg carries out prepared furnace charge；
Charge preheating and mould preheating: first the furnace charge prepared is placed in the drying baker of 200 DEG C preheating 30min ~ 45min；Then the metal type dies used is placed in resistance furnace, with 200 DEG C of preheating 30min ~ 60min.
Second step, melting and refine:
Melting: first crucible is placed in well formula resistance furnace and is preheated to 450 DEG C ~ 500 DEG C, spread last layer coverture in crucible bottom and inwall；
It is sequentially added into the pure magnesium ingot through preheating and fine aluminium ingot, and spreads last layer coverture on melted ingot surface；
Then resistance furnace temperature is risen to 740 DEG C ~ 760 DEG C, after pure magnesium ingot and fine aluminium ingot all melt, be sufficiently stirred for 30 ~ 45 minutes, add the pure zinc ingot through preheating, stirring
Within 30 ~ 45 minutes, to being completely melt, and spread last layer coverture at molten surface, stand 10 ~ 15 minutes；
Again melt temperature is increased to 770 DEG C ~ 790 DEG C, add the pure tin ingot through preheating and pure B block or Al-3B intermediate alloy and stir 30 ~ 45 minutes, after it melts, stand 10 ~ 15 minutes, then 760 DEG C ~ 780 DEG C are cooled to, add the Mg-25Sr intermediate alloy through preheating, stand 10 ~ 15 minutes after being sufficiently stirred for 30 ~ 45 minutes again, and spread last layer coverture at molten surface；
Maintain the temperature-resistant Mg-4Mn intermediate alloy ingot added through preheating, stir and within 30 ~ 45 minutes, treat its fusing and spread last layer coverture at molten surface to stand 15 ~ 20 minutes；
Refine: by melted alloy surface scum silica frost cleaning, melt temperature is down to 720 DEG C ~ 730 DEG C, adds refining agent and carry out refine；Refining agent divides 3 additions, is the most all incorporated as the 1% of alloy mass, and agitation refine stands 5 ~ 10 minutes after each refine in 15 ~ 30 minutes till liquid level is bright mirror surface up and down；The alloy that refine is good is poured into bar, and car removes bar crust, is processed into Ф 200mm or the Ф 95mm rod base of a length of 650mm；
3rd step, Homogenization Treatments and extruded:
Rod base is placed in resistance furnace and is heated to 420 DEG C ~ 450 DEG C, be incubated 8 ~ 10h, carry out Homogenization Treatments；Then from heat-treatment furnace, take out the excellent base after Homogenization Treatments extruded on extruder, be squeezed into the shaped material of radiator of required cross sectional shape；In extrusion process, recipient temperature is 400 DEG C ~ 440 DEG C, extrusion speed 5 ~ 15mm/s；
4th step, artificial aging after extruding:
By the LED radiator section bar after extruding, the section of being sawed into, every segment length 1 ~ 2m, it is heated to 180 DEG C ~ 240 DEG C in being placed in heat-treatment furnace, carries out 6 ~ 8h artificial aging and be high temperature creep-resisting high-heat conductivity and large-power LED magnesium alloy radiator.
Further, described coverture is RJ-2 flux, and flux main mass percent is: MgCl238 ~ 46%, KCl32 ~ 40%, BaCl25 ~ 8%, CaF23~5%。
Further, described refining agent is RJ-6 flux, and flux main mass percent is: KCl54 ~ 56%, BaCl214 ~ 16%, CaF21.5 ~ 2.5%, CaCl227~29%。
Beneficial effects of the present invention:
1, the present invention uses Sr element and B element add in Mg-Al series alloy, and can react generation Al respectively with Al4Sr phase, AlB2The high-melting-point phases such as phase and MgAlSr ternary phase, on the one hand high-melting-point makes crystal grain refine as heterogeneous forming core core, and makes Mg therein17Al12Low melting point phase amount reduces, and is changed into graininess distribution by continuously or semi-continuously net distribution, puies forward heavy alloyed mechanical property；On the other hand the existence of high-melting-point phase makes alloy have enough high-temperature creep resistances and anti-fatigue performance, meets the requirement of high-temperature service.Sr element and B element add the effect that can play composite refining simultaneously, and Sr and B all reacts generation Second Phase Precipitation with Al, reduces the aluminum content in matrix and then carries heavy alloyed heat-conductive characteristic.
2, the present invention uses Sn element and Sr element dissolubility in magnesium matrix are the lowest, Sn dissolubility in magnesium when 200 DEG C is 0.45%, and the dissolubility in magnesium matrix is 0.11% under Sr room temperature, therefore in matrix, solid solution element is the least on the impact of heat-conductive characteristic.The Mg that Sn element produces with Mg after adding2Sn is high melting compound equally, it is possible to makes crystal grain refinement in process of setting and at high temperature stablizes；Additionally Mg2During Sn Dispersed precipitate, α-Mg matrix is played invigoration effect, effectively suppress the formation of MgZn divorsed eutectic body.Mn element is easily combined with impurity element thus purifies liquation and improve alloy mechanics, decay resistance.
3, the homogenizing annealing process that the preparation side of the present invention uses can improve the uneven components in alloy graining process, drops low-alloyed resistance of deformation, beneficially the carrying out of deformation processing.After magnesium alloy hot extrusion molding, owing to quickly cooling down and carrying out big deformation, section bar remain in bigger thermal stress and deformational stress so that easy cracking phenomenon in post-production and installation process.After carrying out artificial aging process, deformational stress and thermal stress are released, Second Phase Precipitation, the plasticity and the toughness that make alloy are improved, and the Second Phase Precipitation in alloy, reduce the solid solution element impact on the heat conductivility of alloy, make the heat conductivity of alloy be improved.
Detailed description of the invention:
The present invention it is expanded on further below in conjunction with specific embodiment:
Embodiment
1
:
High temperature creep-resisting high-heat conductivity and large-power LED magnesium alloy radiator, its preparation method is as follows:
With Mg-2.5Al-0.4Zn-0.4Sr-0.2Sn-0.1B alloy, as a example by the radiator that processing cross section is less:
The first step, furnace charge preparation and furnace charge and mould preheating
Furnace charge prepares: with pure magnesium ingot, fine aluminium ingot, pure zinc ingot, pure tin ingot, Mg-25Sr intermediate alloy, Al-3B intermediate alloy, Mg-4Mn intermediate alloy as raw material, 2.5%Al, 0.4%Zn, 0.4%Sr, 0.2%Sn, 0.1%B, 0.1%Mn by mass percentage, remaining is Mg.Carry out prepared furnace charge；
Furnace charge and mould preheating: the furnace charge prepared is placed in the drying baker of 200 DEG C drying 30min；Use metal type dies, and mould is placed in 200 DEG C of preheating 30min in resistance furnace.
Second step, melting and refine:
Melting: be placed in by crucible in well formula resistance furnace and be preheated to 450 DEG C, spreads last layer coverture in crucible bottom and inwall, is then sequentially added into the pure magnesium ingot through preheating and fine aluminium ingot, and spreads last layer coverture on melted ingot surface；
Resistance furnace temperature is risen to 740 DEG C, treats that pure magnesium ingot and fine aluminium ingot all melt, be sufficiently stirred for 30 minutes, be subsequently adding the pure zinc ingot through preheating, stir after addition 30 minutes to being completely melt, and spread last layer coverture at molten surface, stand 15 minutes；
Again melt temperature is increased to 770 DEG C, add the pure tin ingot through preheating and Al-3B intermediate alloy and stir 45 minutes, after it melts, stand 15 minutes, then 760 DEG C are cooled to, add the Mg-25Sr intermediate alloy through preheating, stand 15 minutes after being sufficiently stirred for 30 minutes again, and spread last layer coverture at molten surface；
Maintain the temperature-resistant Mg-4Mn intermediate alloy ingot added through preheating, stir and within 30 minutes, treat its fusing and spread last layer coverture at molten surface to stand 15 minutes；
Refine: by melted alloy surface scum silica frost cleaning, melt temperature being down to 730 DEG C, add refining agent and carry out refine, refining agent divides 3 addition, the most all adds the 1% of alloy mass, stirs refine 15 minutes up and down till liquid level is bright mirror surface；Stand 5 minutes after refine every time；The alloy that refine is good is poured into bar；Prepared bar car is removed crust, is processed into the Ф 95mm rod base of a length of 650mm.
3rd step, Homogenization Treatments and extruded
Rod base is placed in resistance furnace and is heated to 440 DEG C, be incubated 8h, carry out Homogenization Treatments；Then from heat-treatment furnace, take out the excellent base after Homogenization Treatments extruded on extruder, be squeezed into the shaped material of radiator of required cross sectional shape.Excellent base after taking out heating from heat-treatment furnace to extrude in time, in order to avoid bar temp declines too much affects extruding.In extrusion process, recipient temperature is 400 DEG C, extrusion speed 13mm/s.
4th step, artificial aging processes
By the LED radiator section bar after extruding, the section of being sawed into, every segment length 1 ~ 2m, it is heated to 220 DEG C in being placed in heat-treatment furnace, carries out 6h artificial aging and be high temperature creep-resisting high-heat conductivity and large-power LED magnesium alloy radiator.
After tested, the heat conductivity of the magnesium alloy radiator of gained is 135W/mK, and hardness is 49.3Hv, and at a temperature of 120 DEG C, 100h produces the creep strength of 1% deflection is 75MPa.
Embodiment
2
:
High temperature creep-resisting high-heat conductivity and large-power LED magnesium alloy radiator, its preparation method is as follows:
With Mg-3Al-1Zn-1Sr-2Sn-0.5B alloy, as a example by the radiator that processing cross section is bigger:
The first step, furnace charge preparation and furnace charge and mould preheating:
Furnace charge prepares: with pure magnesium ingot, fine aluminium ingot, pure zinc ingot, pure tin ingot, Mg-25Sr intermediate alloy, pure B block and Mg-4Mn intermediate alloy as raw material, being 3%Al, 1%Zn, 1%Sr, 2% Sn, 0.5% B and 0.5%Mn by mass percentage, remaining carries out prepared furnace charge for Mg；
Charge preheating and mould preheating: the furnace charge prepared is placed in drying baker and is heated to 200 DEG C of drying 35min；Use metal type dies, and mould is placed in resistance furnace be heated to 200 DEG C preheating 45min.
Second step, melting and refine:
Melting: be placed in by crucible in well formula resistance furnace and be preheated to 480 DEG C, spread last layer coverture in crucible bottom and inwall, is sequentially added into the pure magnesium ingot through preheating and fine aluminium ingot, and spreads last layer coverture on melted ingot surface；
Resistance furnace temperature is risen to 760 DEG C, treats that pure magnesium ingot and fine aluminium ingot all melt, be sufficiently stirred for 45 minutes, be subsequently adding the pure zinc ingot through preheating, stir after addition 45 minutes to being completely melt, and spread last layer coverture at molten surface, stand 15 minutes；
Again melt temperature is increased to 790 DEG C, adds the pure tin ingot through preheating and pure B block and stir 45 minutes, after it melts, stand 15 minutes, then cool to 770 DEG C, add Mg-25Sr intermediate alloy, stand 15 minutes after being sufficiently stirred for 30 minutes again, and spread last layer coverture at molten surface；
Maintain the temperature-resistant Mg-4Mn intermediate alloy ingot added through preheating, stir and within 45 minutes, treat its fusing and spread last layer coverture at molten surface to stand 15 minutes；
Refine: by melted alloy surface scum silica frost cleaning, melt temperature being down to 730 DEG C, add refining agent and carry out refine, refining agent divides 3 addition, the most all adds the 1% of alloy mass, stirs refine 30 minutes up and down till liquid level is bright mirror surface；Stand 10 minutes after refine every time；The alloy that refine is good is poured into bar；Prepared bar car is removed crust, is processed into the Ф 200mm rod base of a length of 650mm.
3rd step, Homogenization Treatments and extruded
Rod base is placed in resistance furnace and is heated to 440 DEG C, be incubated 10h, carry out Homogenization Treatments.Then from heat-treatment furnace, take out the excellent base after Homogenization Treatments extruded on extruder, be squeezed into the shaped material of radiator of required cross sectional shape.Excellent base after taking out heating from heat-treatment furnace to extrude in time, in order to avoid bar temp declines too much affects extruding.In extrusion process, recipient temperature is 420 DEG C, extrusion speed 12mm/s.
4th step, artificial aging processes
By the LED radiator section bar after extruding, the section of being sawed into, every segment length 1 ~ 2m, it is heated to 240 DEG C in being placed in heat-treatment furnace, carries out 8h artificial aging and be high temperature creep-resisting high-heat conductivity and large-power LED magnesium alloy radiator.
After testing, the heat conductivity of the magnesium alloy radiator of gained is 130W/mK, and hardness is 52.7Hv, and at a temperature of 120 DEG C, 100h produces the creep strength of 1% deflection is 79MPa..
Embodiment 3:
High temperature creep-resisting high-heat conductivity and large-power LED magnesium alloy radiator, its preparation method is as follows:
With Mg-3.5Al-1.3Zn-3Sn-2Sr-1B alloy, as a example by the radiator that processing cross-sectional area is bigger:.
The first step, furnace charge preparation and furnace charge and mould preheating
Furnace charge prepares: with pure magnesium ingot, fine aluminium ingot, pure zinc ingot, pure tin ingot, Mg-25Sr intermediate alloy, pure B block and Mg-4Mn intermediate alloy as raw material, being 3.5%Al, 1.3%Zn, 2%Sr, 3% Sn, 1% B and 0.8%Mn by mass percentage, remaining carries out prepared furnace charge for Mg；
Furnace charge and mould preheating: the furnace charge prepared is placed in drying baker and is heated to 200 DEG C of drying 45min；Use metal type dies, and mould is placed in resistance furnace be heated to 200 DEG C preheating 60min.
Second step, melting and refine:
Melting: crucible is placed in well formula resistance furnace and is preheated to 500 DEG C, spread last layer coverture in crucible bottom and inwall；It is sequentially added into the pure magnesium ingot through preheating and fine aluminium ingot, and spreads last layer coverture on melted ingot surface,
By resistance furnace temperature temperature to 760 DEG C, treat that magnesium ingot and aluminium ingot all melt, be sufficiently stirred for 45 minutes, be subsequently adding the pure zinc ingot through preheating, stir after addition 45 minutes to being completely melt, and spread last layer coverture at molten surface, stand 15 minutes,
Again melt temperature is risen to 790 DEG C, add pure tin ingot and pure B block and stir 45 minutes, after it melts, stand 15 minutes, then cool to 780 DEG C, add the Mg-25Sr intermediate alloy through preheating, stand 15 minutes after being sufficiently stirred for 30 minutes again, and spread last layer coverture at molten surface
Maintain the temperature-resistant Mg-4Mn intermediate alloy ingot added through preheating, stir and within 45 minutes, treat its fusing and spread last layer coverture at molten surface to stand 15 minutes；
Refine: by melted alloy surface scum silica frost cleaning, melt temperature being down to 730 DEG C, add refining agent and carry out refine, refining agent divides 3 addition, the most all adds the 1% of alloy mass, stirs refine 30 minutes up and down till liquid level is bright mirror surface；Stand 10 minutes after refine every time；The alloy that refine is good is poured into bar；Prepared bar car is removed crust, is processed into the Ф 200mm rod base of a length of 650mm.
3rd step, Homogenization Treatments and extruded
Rod base is placed in resistance furnace and is heated to 440 DEG C, be incubated 10h, carry out Homogenization Treatments.Then from heat-treatment furnace, take out the excellent base after Homogenization Treatments extruded on extruder, be squeezed into the shaped material of radiator of required cross sectional shape.Excellent base after taking out heating from heat-treatment furnace to extrude in time, in order to avoid bar temp declines too much affects extruding.In extrusion process, recipient temperature is 420 DEG C, extrusion speed 10mm/s.
4th step, artificial aging processes
By the LED radiator section bar after extruding, the section of being sawed into, every segment length 1 ~ 2m, it is heated to 240 DEG C in being placed in heat-treatment furnace, carries out 8h artificial aging and be high temperature creep-resisting high-heat conductivity and large-power LED magnesium alloy radiator.
After testing, the heat conductivity of the magnesium alloy radiator fin of gained is 127W/mK, and hardness is 61.9Hv, and at a temperature of 120 DEG C, 100h produces the creep strength of 1% deflection is 81MPa.
Although, the present invention is described in detail the most with a general description of the specific embodiments, but on the basis of the present invention, can make some modifications or improvements it, and this will be apparent to those skilled in the art.Therefore, these modifications or improvements without departing from theon the basis of the spirit of the present invention, belong to the scope of protection of present invention.
Claims (1)
1. a high temperature creep-resisting high-heat conductivity and large-power LED magnesium alloy radiator, it is characterised in that its preparation method is as follows:
The first step, furnace charge preparation and furnace charge and mould preheating
Furnace charge prepares: with pure magnesium ingot, fine aluminium ingot, pure zinc ingot, pure tin ingot, Mg-25Sr intermediate alloy, pure B block and Mg-4Mn intermediate alloy as raw material, being 3.5%Al, 1.3%Zn, 2%Sr, 3% Sn, 1% B and 0.8%Mn by mass percentage, remaining carries out prepared furnace charge for Mg；
Furnace charge and mould preheating: the furnace charge prepared is placed in drying baker and is heated to 200 DEG C of drying 45min；Use metal type dies, and mould is placed in resistance furnace be heated to 200 DEG C preheating 60min；
Second step, melting and refine:
Melting: crucible is placed in well formula resistance furnace and is preheated to 500 DEG C, spread last layer coverture in crucible bottom and inwall；It is sequentially added into the pure magnesium ingot through preheating and fine aluminium ingot, and spreads last layer coverture on melted ingot surface,
By resistance furnace temperature temperature to 760 DEG C, treat that magnesium ingot and aluminium ingot all melt, be sufficiently stirred for 45 minutes, be subsequently adding the pure zinc ingot through preheating, stir after addition 45 minutes to being completely melt, and spread last layer coverture at molten surface, stand 15 minutes,
Again melt temperature is risen to 790 DEG C, add pure tin ingot and pure B block and stir 45 minutes, after it melts, stand 15 minutes, then 780 DEG C are cooled to, add the Mg-25Sr intermediate alloy through preheating, 15 minutes are stood again after being sufficiently stirred for 30 minutes, and spread last layer coverture at molten surface, maintain the temperature-resistant Mg-4Mn intermediate alloy ingot added through preheating, stir and within 45 minutes, treat its fusing and spread last layer coverture at molten surface to stand 15 minutes, refine: by melted alloy surface scum silica frost cleaning, melt temperature is down to 730 DEG C, add refining agent and carry out refine, refining agent divides 3 additions, all add the 1% of alloy mass every time, agitation refine 30 minutes is till liquid level is bright mirror surface up and down；Stand 10 minutes after refine every time；The alloy that refine is good is poured into bar；Prepared bar car is removed crust, is processed into the Ф 200mm rod base of a length of 650mm；
3rd step, Homogenization Treatments and extruded
Rod base is placed in resistance furnace and is heated to 440 DEG C, be incubated 10h, carry out Homogenization Treatments, from heat-treatment furnace, then take out the excellent base after Homogenization Treatments extruded on extruder, be squeezed into the shaped material of radiator of required cross sectional shape；Excellent base after taking out heating from heat-treatment furnace to extrude in time, in order to avoid bar temp declines too much affects extruding, in extrusion process, recipient temperature is 420 DEG C, extrusion speed 10mm/s；
4th step, artificial aging processes
By the LED radiator section bar after extruding, the section of being sawed into, every segment length 1 ~ 2m, it is heated to 240 DEG C in being placed in heat-treatment furnace, carries out 8h artificial aging and be high temperature creep-resisting high-heat conductivity and large-power LED magnesium alloy radiator.
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| KR20030044997A (en) * | 2003-05-23 | 2003-06-09 | 연우인더스트리(주) | High formability the Magnesium alloy and manufacture method of the Magnesium alloy product thereof |
| CN102296219A (en) * | 2011-05-30 | 2011-12-28 | 四川大学 | Mg-Sn-Sr-based magnesium alloy with high strength and toughness and heat resistance |
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| CN101985714B (en) * | 2010-12-07 | 2012-09-26 | 吉林大学 | High-plasticity magnesium alloy and preparation method thereof |
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| KR20030044997A (en) * | 2003-05-23 | 2003-06-09 | 연우인더스트리(주) | High formability the Magnesium alloy and manufacture method of the Magnesium alloy product thereof |
| CN102296219A (en) * | 2011-05-30 | 2011-12-28 | 四川大学 | Mg-Sn-Sr-based magnesium alloy with high strength and toughness and heat resistance |
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