CN102230116A - High-hardness cast magnesium alloy - Google Patents
High-hardness cast magnesium alloy Download PDFInfo
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- CN102230116A CN102230116A CN2011101714077A CN201110171407A CN102230116A CN 102230116 A CN102230116 A CN 102230116A CN 2011101714077 A CN2011101714077 A CN 2011101714077A CN 201110171407 A CN201110171407 A CN 201110171407A CN 102230116 A CN102230116 A CN 102230116A
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Abstract
The invention discloses a high-hardness cast magnesium alloy belonging to the field of magnesium alloys. The magnesium alloy comprises 4-25 % of Al (aluminum), 0.2-2% of Mn (Manganese), 0.002-4 % of rare earth and 0.001-1 % of Ti (Titanium) and comprises Al, Mn, rare earth, Ti and Mg (Magnesium) and inevitable impurities in percentage by weight, wherein the total quantity of the inevitable impurities is not more than 0.5 %, and the content of the single impurity is not more than 0.1 %. According to the invention, the hardness and the high temperature property of the cast magnesium alloy are improved by adopting Mg, Al, Mn and Ti as main alloying elements and using an alloying effect of Re, in particular Gd, and a grain refining effect of the Ti so as to obtain a heat-resistant high-hardness cast magnesium alloy with excellent mechanical property, good liquidity and Brinell hardness HBW of not less than 84.
Description
Technical field
The present invention relates to the magnesium alloy field, particularly a kind of high rigidity is suitable for the magnesium alloy of cast form.
Background technology
Along with development of science and technology, be that the vehicles of representative need further be researched and developed the higher product innovation of fuel availability by alleviating the weight of vehicle body with the automobile.In automobile industry, magnesium alloy is used for substituting traditional cast iron as a kind of novel lightweight metal material by automaker, to realize alleviating the purpose of tare.
In realizing process of the present invention, the contriver finds that there is following problem at least in prior art:
For the part of some special occasions work, need have higher hardness.Existing diecast magnesium alloy Brinell hardness HBW (Brinell Hardnes) scope is 55-63, sees GB GB/T25747-2010 for details, and this hardness can't satisfy the requirement of peculiar part to magnesium alloy hardness fully.
Summary of the invention
In order to address the above problem, the embodiment of the invention provides a kind of high-rigidity cast magnesium alloy.Described technical scheme is as follows:
A kind of high-rigidity cast magnesium alloy, described magnesium alloy is made up of Mg, Al, Mn, rare earth and Ti, and its weight percent consists of Al 4-25%, Mn 0.2-2%, rare earth 0.002-4%, Ti 0.001-1%, and all the other are Mg and unavoidable impurities; Wherein, described unavoidable impurities total amount≤0.5%, single impurity≤0.1%.
Wherein, described rare earth is at least a among Gd, Y, Sm, Nd, La, Ce, Tb, Dy, Ho and the Er.
Preferably, described rare earth is at least a among Gd or Gd and Y, Sm, Nd, La, Ce, Tb, Dy, Ho and the Er.
Preferably, its weight percent consists of Al 14-20%, Mn 0.4-0.8%, Gd 0.1-1%, Ti 0.05-0.2%, and all the other are Mg and unavoidable impurities.
More preferably, its weight percent consists of Al 16%, Mn 0.6%, Gd 0.8%, Ti 0.2%, and all the other are Mg and unavoidable impurities.
The beneficial effect that the technical scheme that the embodiment of the invention provides is brought is: by being main alloy element with Mg, Al, Mn, Ti, utilize the especially alloying action of Gd uniqueness of RE, and Ti crystal grain thinning effect, improve the hardness and the high-temperature behavior of this cast magnesium alloys, obtained a kind ofly having good mechanical property, good fluidity, Brinell hardness HBW and being not less than 84 high rigidity heat resistance casting magnesium alloy; It is casting alloy that the cast magnesium alloys that the embodiment of the invention provides belongs to magnalium, because second principal element is an aluminium, content of rare earth or other bullion content are less relatively, therefore, greatly reduce raw materials cost.
Description of drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the invention, the accompanying drawing of required use is done to introduce simply in will describing embodiment below, obviously, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the microscopic appearance SEM figure of stretching fracture surface of sample under the cast magnesium alloys normal temperature that provides in the embodiment of the invention 3;
Fig. 2 is the microscopic appearance SEM figure of 200 ℃ of following stretching fracture surface of sample of cast magnesium alloys of providing in the embodiment of the invention 3.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below with embodiment of the present invention is described further in detail.
The manufacture craft of the magnesium alloy that the embodiment of the invention provides, heat treating method, hardness and mechanics performance determining method are described as follows:
1, the magnesium alloy that provides of the embodiment of the invention can be made by following two kinds of melting technologies:
Technology one: form and the content alloyage according to the magnesium alloy that the embodiment of the invention provides; in resistance furnace, add magnesium ingot, aluminium ingot, MgMn master alloy and AlTi master alloy; heat up for used resistance furnace, when the above-mentioned metal that adds melts soon, adopt gas shield or insulating covering agent protection.Add MgRE master alloy (as MgGd, MgY, MgNd etc.) or AlRE master alloy when being warmed up to 720 ℃-780 ℃, and stir, leave standstill insulation 30 minutes, get alloy liquid at 720 ℃-780 ℃.Water a fritter sample with gained alloy liquid, detect its melting quality, as: carry out the gas content inspection according to the gas content inspection method,, need carry out refining treatment if second-rate; If up-to-standard, the temperature adjustment to 700 of described alloy liquid is skimmed by ℃-740 ℃, pour into a mould then, promptly obtain the foundry goods of alloy of the present invention.
Resistance furnace also can replace with other smelting furnaces in this technology; Shielding gas can be an argon gas, also can be SF
6, can also be CO
2, or their mixed gas; Insulating covering agent and master alloy product are market sale product or oneself allotment; The refining treatment method adopts the ordinary method of the industry.
Technology two: form and the content alloyage according to the magnesium alloy that the embodiment of the invention provides, in vacuum oven, add aluminium ingot, Mn, Ti, be warming up to 820 ℃, be incubated 2-8 hour, cool to 720 ℃-780 ℃ then, add magnesium ingot and RE.720 ℃-780 ℃ insulations 30 minutes, get alloy liquid behind the melting of metal of waiting to be added, adopt the protection of gas shield or insulating covering agent to prevent the alloy liquid oxidation.Water a fritter sample with gained alloy liquid, detect its melting quality, as: the inspection of gas content, if second-rate, need carry out refining treatment; If up-to-standard, the temperature adjustment to 700 of described alloy liquid is skimmed by ℃-740 ℃, pour into a mould then, promptly obtain the foundry goods of alloy of the present invention.
Vacuum oven can substitute with other smelting furnaces such as main frequency furnaces in this technology; Shielding gas can be an argon gas, also can be SF
6, can also be CO
2, or their mixed gas; Insulating covering agent and rare earth RE are sell goods on the market; The refining treatment method adopts the ordinary method of the industry.
2, the thermal treatment and the treatment process thereof of the magnesium alloy that provides of the embodiment of the invention:
The die casting of the cast magnesium alloys that the embodiment of the invention provides can not heat-treated, and the cast member of other form can be heat-treated, and generally adopts the T4 solution treatment.The T4 solid solution treatment process is: cast member is warming up to 360-520 ℃ in chamber type electric resistance furnace, is incubated 1-30 hour, shrend after cast member is come out of the stove, water temperature 20-80 ℃.
3, the measuring method of the hardness of magnesium alloy of the present invention and mechanical property:
The casting magnesium that the embodiment of the invention is provided closes and has carried out under normal temperature and the 200 ℃ of two states, and the microscopic appearance of tension specimen fracture is observed, and specifically sees Fig. 1, Fig. 2; The lee ' hardness HL value of the cast magnesium alloys that the embodiment of the invention provides is the collection of hand-held sclerometer; Brinell hardness is 10mm, 500 kilograms of pressure, F/D at sphere diameter
2Be to test under 5 the condition.
Embodiment 1
Prepare high hardness magnesium alloy by above-mentioned technology one described step, foundry goods adopts die cast, and described magnesium alloy weight percent consists of Al14%, Mn 0.2%, Y 0.002%, Ti 0.001%, and all the other are Mg and unavoidable impurities; Wherein, weight percent≤0.5% of described unavoidable impurities total amount in described magnesium alloy, weight percent≤0.1% of single impurity in described magnesium alloy.
The thermal treatment of foundry goods (T4 solid solution treatment process): cast member is warming up to 480 ℃ in chamber type electric resistance furnace, is incubated 2 hours, shrend after cast member is come out of the stove, 60 ℃ of water temperatures.
The performance of the cast magnesium alloys that present embodiment provides is referring to table 1 and table 2.
Embodiment 2
Prepare high hardness magnesium alloy by above-mentioned technology two described steps, foundry goods adopts semi-solid casting, and described magnesium alloy weight percent consists of Al 25%, Mn 2%, Sm 4%, Ti 1%, and all the other are Mg and unavoidable impurities; Wherein, weight percent≤0.5% of described unavoidable impurities total amount in described magnesium alloy, weight percent≤0.1% of single impurity in described magnesium alloy.
The thermal treatment of foundry goods (T4 solid solution treatment process): cast member is warming up to 520 ℃ in chamber type electric resistance furnace, is incubated 1 hour, shrend after cast member is come out of the stove, 80 ℃ of water temperatures.
The casting magnesium that present embodiment provides closes performance referring to table 1 and table 2.
Embodiment 3
Prepare high hardness magnesium alloy by above-mentioned technology two described steps, foundry goods adopts low-pressure casting, and described magnesium alloy weight percent consists of Al 16%, Mn 0.6%, Gd 0.8%, Ti 0.2%, and all the other are Mg and unavoidable impurities; Wherein, weight percent≤0.5% of described unavoidable impurities total amount in described magnesium alloy, weight percent≤0.1% of single impurity in described magnesium alloy.
The thermal treatment of foundry goods (T4 solid solution treatment process): cast member is warming up to 400 ℃ in chamber type electric resistance furnace, is incubated 15 hours, shrend after cast member is come out of the stove, 20 ℃ of water temperatures.
The performance of the cast magnesium alloys that present embodiment provides is referring to table 1 and table 2.
Embodiment 4,
Prepare high hardness magnesium alloy by above-mentioned technology one described step, foundry goods adopts Hpdc, and described magnesium alloy weight percent consists of Al 18%, Mn 0.2%, Nd 0.2%, Ti 0.25%, and all the other are Mg and unavoidable impurities; Wherein, weight percent≤0.5% of described unavoidable impurities total amount in described magnesium alloy, weight percent≤0.1% of single impurity in described magnesium alloy.
The performance of the cast magnesium alloys that present embodiment provides is referring to table 1 and table 2.
Embodiment 5
Prepare high hardness magnesium alloy by above-mentioned technology one described step, foundry goods adopts precision casting, and described magnesium alloy weight percent consists of Al 25%, Mn 0.22%, La 0.2%, Ti 0.25%, and all the other are Mg and unavoidable impurities; Wherein, weight percent≤0.5% of described unavoidable impurities total amount in described magnesium alloy, weight percent≤0.1% of single impurity in described magnesium alloy.
The thermal treatment of foundry goods (T4 solid solution treatment process): cast member is warming up to 360 ℃ in chamber type electric resistance furnace, is incubated 30 hours, shrend after cast member is come out of the stove, 20 ℃ of water temperatures.
The performance of the cast magnesium alloys that present embodiment provides is referring to table 1 and table 2.
Embodiment 6
Prepare high hardness magnesium alloy by above-mentioned technology two described steps, foundry goods adopts die cast, and described magnesium alloy weight percent consists of Al 20%, Mn0.8%, Gd 1%, Ti 0.2%, and all the other are Mg and unavoidable impurities; Wherein, weight percent≤0.5% of described unavoidable impurities total amount in described magnesium alloy, weight percent≤0.1% of single impurity in described magnesium alloy.
The thermal treatment of foundry goods (T4 solid solution treatment process): cast member is warming up to 400 ℃ in chamber type electric resistance furnace, is incubated 14 hours, shrend after cast member is come out of the stove, 20 ℃ of water temperatures.
The performance of the cast magnesium alloys that present embodiment provides is referring to table 1 and table 2.
Embodiment 7
Prepare high hardness magnesium alloy by above-mentioned technology two described steps, foundry goods adopts sand mold casting, and described magnesium alloy weight percent consists of Al 10%, Mn 1%, Tb 1%, Ti 0.05%, and all the other are Mg and unavoidable impurities; Wherein, weight percent≤0.5% of described unavoidable impurities total amount in described magnesium alloy, weight percent≤0.1% of single impurity in described magnesium alloy.
The thermal treatment of foundry goods (T4 solid solution treatment process): cast member is warming up to 480 ℃ in chamber type electric resistance furnace, is incubated 8 hours, shrend after cast member is come out of the stove, 60 ℃ of water temperatures.
The performance of the cast magnesium alloys that present embodiment provides is referring to table 1 and table 2.
Embodiment 8
Prepare high hardness magnesium alloy by above-mentioned technology two described steps, foundry goods adopts die cast, and described magnesium alloy weight percent consists of Al 4%, Mn 2%, Dy 4%, Ti 1%, and all the other are Mg and unavoidable impurities; Wherein, weight percent≤0.5% of described unavoidable impurities total amount in described magnesium alloy, weight percent≤0.1% of single impurity in described magnesium alloy.
The thermal treatment of foundry goods (T4 solid solution treatment process): cast member is warming up to 360 ℃ in chamber type electric resistance furnace, is incubated 30 hours, shrend after cast member is come out of the stove, 20 ℃ of water temperatures.
The performance of the cast magnesium alloys that present embodiment provides is referring to table 1 and table 2.
Embodiment 9
Prepare high hardness magnesium alloy by above-mentioned technology two described steps, foundry goods adopts low-pressure casting, and described magnesium alloy weight percent consists of Al 25%, Mn 0.5%, Ho 2%, Ti 0.5%, and all the other are Mg and unavoidable impurities; Wherein, weight percent≤0.5% of described unavoidable impurities total amount in described magnesium alloy, weight percent≤0.1% of single impurity in described magnesium alloy.
The thermal treatment of non-die casting (T4 solid solution treatment process): cast member is warming up to 520 ℃ in chamber type electric resistance furnace, is incubated 1 hour, shrend after cast member is come out of the stove, 80 ℃ of water temperatures.
The performance of the cast magnesium alloys that present embodiment provides is referring to table 1 and table 2.
Embodiment 10
Prepare high hardness magnesium alloy by above-mentioned technology two described steps, foundry goods adopts low-pressure casting, and described magnesium alloy weight percent consists of Al 22%, Mn 0.5%, Er 0.002%, Ti 0.001%, and all the other are Mg and unavoidable impurities; Wherein, weight percent≤0.5% of described unavoidable impurities total amount in described magnesium alloy, weight percent≤0.1% of single impurity in described magnesium alloy.
The thermal treatment of non-die casting (T4 solid solution treatment process): cast member is warming up to 520 ℃ in chamber type electric resistance furnace, is incubated 1 hour, shrend after cast member is come out of the stove, 80 ℃ of water temperatures.
The performance of the cast magnesium alloys that present embodiment provides is referring to table 1 and table 2.
Embodiment 11
Prepare high hardness magnesium alloy by above-mentioned technology two described steps, foundry goods adopts Hpdc, and described magnesium alloy weight percent consists of Al 18%, Mn 1.5%, Gd 0.6%, Er 1.4%, Ti 0.1%, and all the other are Mg and unavoidable impurities; Wherein, weight percent≤0.5% of described unavoidable impurities total amount in described magnesium alloy, weight percent≤0.1% of single impurity in described magnesium alloy.
The performance of the cast magnesium alloys that present embodiment provides is referring to table 1 and table 2.
Embodiment 12
Prepare high hardness magnesium alloy by above-mentioned technology two described steps, foundry goods adopts permanent mold casting, and described magnesium alloy weight percent consists of Al 14%, Mn 0.4%, Gd 0.1%, Ce 0.02%, Ti 0.05%, and all the other are Mg and unavoidable impurities; Wherein, weight percent≤0.5% of described unavoidable impurities total amount in described magnesium alloy, weight percent≤0.1% of single impurity in described magnesium alloy.
The thermal treatment of foundry goods (T4 solid solution treatment process): cast member is warming up to 520 ℃ in chamber type electric resistance furnace, is incubated 1 hour, shrend after cast member is come out of the stove, 80 ℃ of water temperatures.
The performance of the cast magnesium alloys that present embodiment provides is referring to table 1 and table 2.
Embodiment 13
Prepare high hardness magnesium alloy by above-mentioned technology two described steps, foundry goods adopts Hpdc, and described magnesium alloy weight percent consists of Al 16%, Mn 0.4%, Ce 0.1%, Ti 0.05%, and all the other are Mg and unavoidable impurities; Wherein, weight percent≤0.5% of described unavoidable impurities total amount in described magnesium alloy, weight percent≤0.1% of single impurity in described magnesium alloy.
The performance of the cast magnesium alloys that present embodiment provides is referring to table 1 and table 2.
The performance measurement result of the cast member of the cast magnesium alloys that the embodiment of the invention provides:
1, the cast member of the cast magnesium alloys that provides of the embodiment of the invention see Table 1 in the main mechanical property after T4 thermal treatment, Fig. 1 and Fig. 2:
The lee ' hardness HL mean value of its cast(ing) surface thin layer is not less than 477.The casting magnesium that the embodiment of the invention is provided closes the microscopic appearance that has carried out stretching fracture surface of sample under normal temperature and the 200 ℃ of two states and observes, the electronic scanning SEM of stretching fracture surface of sample microscopic appearance figure under the cast magnesium alloys normal temperature that Fig. 1 provides for embodiment 3, Fig. 2 schemes for the electronic scanning SEM of 200 ℃ of following stretching fracture surface of sample microscopic appearances of cast magnesium alloys that embodiment 3 provides, and magnification is 5000.The foundry goods that the embodiment of the invention provides is not less than 130MPa at 200 ℃ tensile strength Rm, and this main high temperature index has surpassed the ZM2 cast magnesium alloys, and the tensile strength Rm of ZM2 cast magnesium alloys in the time of 200 ℃ is not less than 110MPa.
Table 1, the heat treated main mechanical property of high-rigidity cast magnesium alloy T4
Therefore, the lee ' hardness of the cast magnesium alloys that the embodiment of the invention provides is very high, is higher than 477 simultaneously, and high temperature resistant index is also apparently higher than cast magnesium alloys commonly used.
2, the Brinell hardness parameter of the cast magnesium alloys that provides of embodiment of the invention 1-13 sees table 2 for details:
The Brinell hardness of the cast magnesium alloys that table 2, embodiment of the invention 1-13 provide
| Embodiment | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 |
| Brinell hardness HBW | 86 | 89 | 100 | 90 | 93 | 98 | 88 | 87 | 90 | 90 | 97 | 99 | 89 |
By shown in the table two, the die casting Brinell hardness HBW that the embodiment of the invention provides is 84-100, is higher than the listed durometer level 55-63 of GB GB/T25747-2010 far away; Simultaneously, it can also be seen that from table two that the Brinell hardness of the cast magnesium alloys that embodiment 3 provides is the highest; Embodiment 3,6,11 and 12 and other embodiment contrast as can be known, the RE effect that contains Gd is better; Embodiment 4,11 and 13 and other embodiment contrast as can be known, for thermal treatment foundry goods not, its hardness is also very high, near or reach the level that T4 handles.
The cast magnesium alloys that the invention process example provides easily carries out mechanical workouts such as turning, milling, sawing, and machining property is good.
The present invention is applicable to forging types such as die cast, Hpdc, semi-solid casting, low-pressure casting, precision casting, sand mold casting.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. high-rigidity cast magnesium alloy, it is characterized in that, described magnesium alloy is made up of Mg, Al, Mn, rare earth and Ti, and its weight percent consists of Al4-25%, Mn0.2-2%, rare earth 0.002-4%, Ti 0.001-1%, and all the other are Mg and unavoidable impurities; Wherein, described unavoidable impurities total amount≤0.5%, single impurity≤0.1%.
2. magnesium alloy according to claim 1 is characterized in that, described rare earth is at least a among Gd, Y, Sm, Nd, La, Ce, Tb, Dy, Ho and the Er.
3. magnesium alloy according to claim 1 and 2 is characterized in that, described rare earth is at least a among Gd or Gd and Y, Sm, Nd, La, Ce, Tb, Dy, Ho and the Er.
4. according to each described magnesium alloy of claim 1-3, it is characterized in that its weight percent consists of Al14-20%, Mn0.4-0.8%, Gd0.1-1%, Ti0.05-0.2%, all the other are Mg and unavoidable impurities.
5. according to each described magnesium alloy of claim 1-4, it is characterized in that its weight percent consists of Al16%, Mn0.6%, Gd0.8%, Ti0.2%, all the other are Mg and unavoidable impurities.
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Cited By (8)
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|---|---|---|---|---|
| CN102400023A (en) * | 2011-11-14 | 2012-04-04 | 周涛 | Preparation method of magnesium alloy for housing of electric bicycle instrument panel |
| CN102618763A (en) * | 2012-04-13 | 2012-08-01 | 江汉大学 | Heat resistant magnesium alloy |
| CN102618762A (en) * | 2012-04-13 | 2012-08-01 | 江汉大学 | Heat-resisting magnesium alloy |
| CN102618757A (en) * | 2012-04-13 | 2012-08-01 | 江汉大学 | Heat-resistant magnesium alloy |
| CN102618759A (en) * | 2012-04-13 | 2012-08-01 | 江汉大学 | Low-shrinkage magnesium alloy |
| CN102994846A (en) * | 2012-10-15 | 2013-03-27 | 高源� | Anti-radiation antistatic magnesium alloy capable of strengthening screen magnetism and preparation method thereof |
| CN104498794A (en) * | 2014-12-15 | 2015-04-08 | 镁联科技（芜湖）有限公司 | High-temperature-resistant magnesium alloy, and preparation method and application thereof |
| CN105256208A (en) * | 2015-10-09 | 2016-01-20 | 天长市兴宇铸造有限公司 | Boron nitride nanotube modifying Mg-Al-Mn magnesium alloy material for casting automobile parts and preparation method thereof |
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| CN102400023A (en) * | 2011-11-14 | 2012-04-04 | 周涛 | Preparation method of magnesium alloy for housing of electric bicycle instrument panel |
| CN102400023B (en) * | 2011-11-14 | 2016-09-14 | 陈均 | A kind of preparation method of magnesium alloy for housing of electric bicycle instrument panel |
| CN102618762B (en) * | 2012-04-13 | 2014-10-29 | 江汉大学 | Heat-resisting magnesium alloy |
| CN102618757A (en) * | 2012-04-13 | 2012-08-01 | 江汉大学 | Heat-resistant magnesium alloy |
| CN102618759A (en) * | 2012-04-13 | 2012-08-01 | 江汉大学 | Low-shrinkage magnesium alloy |
| CN102618762A (en) * | 2012-04-13 | 2012-08-01 | 江汉大学 | Heat-resisting magnesium alloy |
| CN102618759B (en) * | 2012-04-13 | 2014-10-29 | 江汉大学 | Low-shrinkage magnesium alloy |
| CN102618757B (en) * | 2012-04-13 | 2014-10-29 | 江汉大学 | Heat-resistant magnesium alloy |
| CN102618763A (en) * | 2012-04-13 | 2012-08-01 | 江汉大学 | Heat resistant magnesium alloy |
| CN102994846A (en) * | 2012-10-15 | 2013-03-27 | 高源� | Anti-radiation antistatic magnesium alloy capable of strengthening screen magnetism and preparation method thereof |
| CN102994846B (en) * | 2012-10-15 | 2014-12-31 | 深圳和泰源材料科技有限公司 | Anti-radiation antistatic magnesium alloy capable of strengthening screen magnetism and preparation method thereof |
| CN104498794A (en) * | 2014-12-15 | 2015-04-08 | 镁联科技（芜湖）有限公司 | High-temperature-resistant magnesium alloy, and preparation method and application thereof |
| CN105256208A (en) * | 2015-10-09 | 2016-01-20 | 天长市兴宇铸造有限公司 | Boron nitride nanotube modifying Mg-Al-Mn magnesium alloy material for casting automobile parts and preparation method thereof |
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Application publication date: 20111102 |