CN102994839A - Heatproof casting magnesium alloy - Google Patents
Heatproof casting magnesium alloy Download PDFInfo
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- CN102994839A CN102994839A CN2011102670521A CN201110267052A CN102994839A CN 102994839 A CN102994839 A CN 102994839A CN 2011102670521 A CN2011102670521 A CN 2011102670521A CN 201110267052 A CN201110267052 A CN 201110267052A CN 102994839 A CN102994839 A CN 102994839A
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Abstract
The invention discloses a heatproof casting magnesium alloy, which belongs to the magnesium alloy field. The magnesium alloy is composed of Mg, Al, Mn, rare earth and Nb, and comprises the following components by weight: 1.5-25% of Al, 0.13-2% of Mn, 0.001-16% of rare earth, 0.001-4% of Nb and the balance of Mg. The rare earth and an Nb element are added in the magnesium alloy, and a structure of a beta phase is changed; thereby the high temperature resistance performance of the casting magnesium alloy is enhanced, the heatproof casting magnesium alloy has excellent mechanical property and machinery processability, and good fluidity and die casting performance.
Description
Technical field
The present invention relates to a kind of magnesium alloy, particularly a kind of MgAlMn is heat resistance casting magnesium alloy.
Background technology
Along with the development of science and technology, the vehicles take automobile as representative need to by alleviating the weight of vehicle body, further be researched and developed the higher product innovation of fuel availability.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.
At present, domestic MgAlMn is that the diecast magnesium alloy trade mark has YM202, YM203, YM204, YM205; The MgAlMn of USS ASTM B is that the diecast magnesium alloy trade mark has AM50A, AM60A, AM60B; The MgAlMn of Nippon Standard JIS H is that the diecast magnesium alloy trade mark has MDC2B, MDC4, MDC5; The MgAlMn of European standard EN is that the diecast magnesium alloy trade mark has EN-MC21210, EN-MC21220, EN-MC21230.The alloy of these trades mark, flowability, mechanical property, die casting are all very good.
In realizing process of the present invention, the contriver finds that there is following problem at least in prior art: some parts on the automobile, as: gear box, engine case lid etc., working temperature is higher, and also exists light-weighted demand.But above-mentioned MgAlMn series magnesium alloy since alloy structure in β with Mg
17Al
12Be main, Mg
17Al
12Fusing point is lower, non-refractory, and above-mentioned MgAlMn series magnesium alloy only is tens MPa in the tensile strength under 200 ℃ of high temperature, so the parts of its production are unsuitable for working under hot environment, thereby can't satisfy the high temperature resistant demand of the above-mentioned parts of automobile.
Summary of the invention
In order to solve above-mentioned problems of the prior art, the embodiment of the invention provides a kind of heat resistance casting magnesium alloy with good die casting.Described technical scheme is as follows:
A kind of heat resistance casting magnesium alloy, described magnesium alloy is comprised of Mg, Al, Mn, rare earth (RE) and Nb, and its weight percent consists of Al 1.5-25%, Mn 0.13-2%, rare earth 0.001-16%, Nb 0.001-4%, and all the other are Mg.
Wherein, described rare earth is at least a among Gd, Y, Sc, Sm, Nd, La, Ce, Tb, Dy, Ho and the Er.
Preferably, described rare earth is at least a among Gd or Gd and Y, Sc, Sm, Nd, La, Ce, Tb, Dy, Ho and the Er.
Preferably, the weight percent of described magnesium alloy consists of Al 1.6-6.5%, Mn 0.13-0.7%, Gd 0.1-2%, Nb 0.05-1%, and all the other are Mg.
More preferably, the weight percent of described magnesium alloy consists of Al 4.4-6.5%, Mn 0.26-0.6%, Gd 0.1-0.8%, Nb0.05-0.6%, and all the other are Mg.
Most preferably, the weight percent of described magnesium alloy consists of Al 6.2%, Mn 0.4%, Gd 0.5%, Nb 0.2%, and all the other are Mg.
Wherein, described Nb adds in the described magnesium alloy by the form of AlNb master alloy or NbAl master alloy.
The magnesium alloy that the embodiment of the invention provides can be made into cast magnesium alloys by this area three kinds of melting technologies commonly used, and wherein die casting can not heat-treated, and the cast member of other form can be heat-treated, and generally adopts the T4 solution treatment.
The beneficial effect that the technical scheme that the embodiment of the invention provides is brought is: in the cast magnesium alloys provided by the invention, because RE can form the MgRE compound with Mg, Nb can form some resistant to elevated temperatures metallic compounds with other elements (such as Al), these metallic compounds are distributed on the crystal boundary, have substituted part Mg
17Al
12The β phase has changed the structure of β phase, thereby has improved the resistance to elevated temperatures of cast magnesium alloys, has obtained a kind of have good mechanical property, machinability is good, mobile, die casting is good heat-proof compression casting magnesium alloy.
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 was done to introduce simply during the below will describe embodiment, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the microscopic appearance SEM photo of stretching fracture surface of sample under the diecast magnesium alloy normal temperature that provides in the embodiment of the invention 3;
Fig. 2 is the microscopic appearance SEM photo of 200 ℃ of lower stretching fracture surface of sample of diecast magnesium alloy of providing in the embodiment of the invention 3.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
Manufacture craft, the heat treating method of the magnesium alloy that the embodiment of the invention provides are described as follows:
1, the magnesium alloy that provides of the embodiment of the invention can be made by following three kinds of melting technologies:
Technique one: magnesium alloy composition and the cubage that provides according to the embodiment of the invention and the starting material that are ready to aequum; in resistance furnace, add magnesium ingot, aluminium ingot, MgMn master alloy and AlNb master alloy or NbAl master alloy; heat up for used resistance furnace, when the above-mentioned metal that adds melts soon, adopt gas shield or magnesium alloy covering agent protection.Add MgRE master alloy (such as MgGd, MgY, MgNd etc.) or AlRE master alloy when being warmed up to 720 ℃-780 ℃, and stir, leave standstill insulation 30 minutes at 720 ℃-780 ℃, get aluminium alloy.Water a fritter sample with the gained aluminium alloy, detect its Melting Quality, as: carry out the gas content inspection according to the gas content inspection method, if second-rate, need carry out refining treatment; If up-to-standard, described aluminium alloy temperature adjustment to 700 ℃-740 ℃ is skimmed, then pour into a mould, namely obtain the foundry goods of alloy of the present invention.
Resistance furnace also can replace with other smelting furnaces in this technique; Shielding gas can be argon gas, also can be SF
6, can also be CO
2, or their mixed gas; Magnesium alloy covering agent and master alloy product are the market sale product; The refining treatment method adopts the ordinary method of the industry.
Technique two: magnesium alloy composition and the cubage that provides according to the embodiment of the invention and the starting material that are ready to aequum, in vacuum oven, add aluminium ingot, Mn or Mn agent, AlNb master alloy or NbAl master alloy, be warming up to 820 ℃, be incubated 2-8 hour, then cool to 720 ℃-780 ℃, add magnesium ingot and RE.Behind the melting of metal that adds, 720 ℃-780 ℃ insulations 30 minutes, get aluminium alloy, adopt the protection of gas shield or magnesium alloy covering agent to prevent the aluminium alloy oxidation.Water a fritter sample with the gained aluminium alloy, detect its Melting Quality, as: the inspection of gas content, if second-rate, need carry out refining treatment; If up-to-standard, described aluminium alloy temperature adjustment to 700 ℃-740 ℃ is skimmed, then pour into a mould, namely 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 technique; Shielding gas can be argon gas, also can be SF
6, can also be CO
2, or their mixed gas; Magnesium alloy covering agent, rare earth, Mn agent, master alloy are sell goods on the market; The refining treatment method adopts the ordinary method of the industry.
Technique three: magnesium alloy composition and the cubage that the photograph embodiment of the invention provides and the starting material that are ready to aequum; adding standard brand MgAlMn in smelting furnace is diecast magnesium alloy and AlNb master alloy or NbAl master alloy, adopts gas shield or magnesium alloy covering agent protection when above-mentioned metal melts soon.Add MgRE master alloy (such as MgGd, MgY, MgNd etc.) or AlRE master alloy when being warmed up to 720 ℃-780 ℃, and stir, leave standstill insulation 30 minutes at 720 ℃-780 ℃, get aluminium alloy.Water a fritter sample with the gained aluminium alloy, detect its Melting Quality, as: carry out the gas content inspection according to the gas content inspection method, if second-rate, need carry out refining treatment; If up-to-standard, described aluminium alloy temperature adjustment to 700 ℃-740 ℃ is skimmed, then pour into a mould, namely obtain the foundry goods of alloy of the present invention.
Shielding gas can be argon gas in this technique, also can be SF
6, can also be CO
2, or their mixed gas; Magnesium alloy covering agent, MgRE or AlRE master alloy, Mn agent are sell goods on the market; The refining treatment method adopts the ordinary method of the industry.
2, thermal treatment and the treatment process thereof of the magnesium alloy that provides of the embodiment of the invention:
Die casting in 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 360-480 ℃ in chamber type electric resistance furnace, is incubated 1-30 hour, the cast member rear shrend of coming out of the stove, water temperature 20-80 ℃.
Be subjected to fusion process to select the impact of some other inevitable factor in the purity of raw material and melting, the castingprocesses, the cast magnesium alloys that the embodiment of the invention provides can contain inevitable impurity, such as Zn, Si, Cu etc., as long as the weight percent of described inevitable total impurities in described magnesium alloy finished product≤0.5%, the weight percent of single contaminant in described magnesium alloy finished product≤0.1% just can not cause on the performance of magnesium alloy obvious impact.
Prepare heat resistance magnesium alloy by above-mentioned technique one described step, foundry goods adopts Hpdc, and described magnesium alloy weight percent consists of Al 6.2%, Mn 0.4%, Gd 0.5%, Nb 0.2%, and all the other are Mg.
The performance of the Mg alloy castings that present embodiment provides is referring to table 1.
Embodiment 2
Prepare heat resistance magnesium alloy by above-mentioned technique two described steps, foundry goods adopts die cast, and the weight percent of described magnesium alloy consists of Al 1.5%, Mn 0.13%, Sm 0.001%, Nb 0.001%, and all the other are Mg.
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 1 hour, the cast member rear shrend of coming out of the stove, 80 ℃ of water temperatures.
The performance of the Mg alloy castings that present embodiment provides is referring to table 1.
Embodiment 3
Prepare heat resistance magnesium alloy by above-mentioned technique two described steps, foundry goods adopts semi-solid casting, and the weight percent of described magnesium alloy consists of Al 25%, Mn 2%, Y 16%, Nb 4%, and all the other are Mg.
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, the cast member rear shrend of coming out of the stove, 80 ℃ of water temperatures.
The performance of the Mg alloy castings that present embodiment provides is referring to table 1.
Embodiment 4
Prepare heat resistance magnesium alloy by above-mentioned technique three described steps, foundry goods adopts Hpdc, and the standard brand diecast magnesium alloy is AM60A, and the weight percent of heat resistance magnesium alloy consists of Al 6%, Mn 0.2%, Gd 0.2%, Nb 1%, and all the other are Mg.
The performance of the Mg alloy castings that present embodiment provides is referring to table 1.
Embodiment 5
Prepare heat resistance magnesium alloy by above-mentioned technique two described steps, foundry goods adopts low-pressure casting, and the weight percent of described magnesium alloy consists of Al 1.6%, Mn 0.13%, Ho 0.1%, Nb 0.05%, and all the other are Mg.
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 20 hours, the cast member rear shrend of coming out of the stove, 50 ℃ of water temperatures.
The performance of the Mg alloy castings that present embodiment provides is referring to table 1.
Embodiment 6
Prepare heat resistance magnesium alloy by above-mentioned technique two described steps, foundry goods adopts precision casting, and the weight percent of described magnesium alloy consists of Al 6.5%, Mn 0.7%, Gd 2%, Nb 1%, and all the other are Mg.
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 5 hours, the cast member rear shrend of coming out of the stove, 70 ℃ of water temperatures.
The performance of the Mg alloy castings that present embodiment provides is referring to table 1.
Embodiment 7
Prepare heat resistance magnesium alloy by above-mentioned technique one described step, foundry goods adopts sand mold casting, and the weight percent of described magnesium alloy consists of Al 4.4%, Mn 0.26%, Gd 0.1%, Nb 0.05%, and all the other are Mg.
The thermal treatment of foundry goods (T4 solid solution treatment process): cast member is warming up to 460 ℃ in chamber type electric resistance furnace, is incubated 1 hour, the cast member rear shrend of coming out of the stove, 60 ℃ of water temperatures.
The performance of the Mg alloy castings that present embodiment provides is referring to table 1.
Embodiment 8
Prepare heat resistance magnesium alloy by above-mentioned technique two described steps, foundry goods adopts Hpdc, and the weight percent of described magnesium alloy consists of Al 6.5%, Mn 0.6%, Gd 0.8%, Nb 0.6%, and all the other are Mg.
The performance of the Mg alloy castings that present embodiment provides is referring to table 1.
Embodiment 9
Prepare heat resistance magnesium alloy by above-mentioned technique two described steps, foundry goods adopts Hpdc, and the weight percent of described magnesium alloy consists of Al 6.5%, Mn 0.6%, Gd 0.4%, Nd 0.4%, Nb 0.6%, and all the other are Mg.
The performance of the Mg alloy castings that present embodiment provides is referring to table 1.
Embodiment 10
Prepare heat resistance magnesium alloy by above-mentioned technique two described steps, foundry goods adopts Hpdc, and the weight percent of described magnesium alloy consists of Al 6.5%, Mn 0.6%, Ce 0.8%, Nb 0.6%, and all the other are Mg.
The performance of the Mg alloy castings that present embodiment provides is referring to table 1.
Embodiment 11
Prepare heat resistance magnesium alloy by above-mentioned technique two described steps, foundry goods adopts die cast, and the weight percent of described magnesium alloy consists of Al 2%, Mn 0.2%, La 1.2%, Nb 0.8%, and all the other are Mg.
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, the cast member rear shrend of coming out of the stove, 20 ℃ of water temperatures.
The performance of the Mg alloy castings that present embodiment provides is referring to table 1.
Embodiment 12
Prepare heat resistance magnesium alloy by above-mentioned technique one described step, foundry goods adopts sand mold casting, and the weight percent of described magnesium alloy consists of Al 6%, Mn 0.5%, Tb 0.6%, Nb 0.4%, and all the other are Mg.
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, the cast member rear shrend of coming out of the stove, 60 ℃ of water temperatures.
The performance of the Mg alloy castings that present embodiment provides is referring to table 1.
Embodiment 13
Prepare heat resistance magnesium alloy by above-mentioned technique two described steps, foundry goods adopts die cast, and the weight percent of described magnesium alloy consists of Al 10%, Mn 1%, Dy 8%, Nb 2%, and all the other are Mg.
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, the cast member rear shrend of coming out of the stove, 20 ℃ of water temperatures.
The performance of the Mg alloy castings that present embodiment provides is referring to table 1.
Embodiment 14
Prepare heat resistance magnesium alloy by above-mentioned technique two described steps, foundry goods adopts die cast, and the weight percent of described magnesium alloy consists of Al 3%, Mn 0.65%, Er 1%, Nb 0.7%, and all the other are Mg.
The thermal treatment of foundry goods (T4 solid solution treatment process): cast member is warming up to 440 ℃ in chamber type electric resistance furnace, is incubated 1 hour, the cast member rear shrend of coming out of the stove, 60 ℃ of water temperatures.
The performance of the Mg alloy castings that present embodiment provides is referring to table 1.
Embodiment 15
Prepare heat resistance magnesium alloy by above-mentioned technique two described steps, foundry goods adopts die cast, and the weight percent of described magnesium alloy consists of Al 5%, Mn 0.5%, Sc 0.5%, Nb 0.7%, and all the other are Mg.
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, the cast member rear shrend of coming out of the stove, 40 ℃ of water temperatures.
The performance of the Mg alloy castings that present embodiment provides is referring to table 1.
The comparative example
Prepare heat resistance magnesium alloy by above-mentioned technique one described step, foundry goods adopts Hpdc, and described magnesium alloy weight percent consists of Al 6.2%, Mn 0.4%, Gd 0.5%, and all the other are Mg and inevitable impurity.
The performance of the Mg alloy castings that present embodiment provides is referring to table 1.
More than the Mg alloy castings that provides of each embodiment all contain inevitable impurity, weight percent in described magnesium alloy finished product of the weight percent of described inevitable total impurities in described magnesium alloy finished product≤0.5%, single contaminant≤0.1%.
The Mechanics Performance Testing of foundry goods is carried out at electronic universal tester.The mechanical property of the Mg alloy castings that various embodiments of the present invention and comparative example provide is referring to table 1.
The mechanical property parameters table of the Mg alloy castings that each embodiment of table 1 provides
By shown in the table 1, the Mg alloy castings that the embodiment of the invention provides under 200 ℃ of high temperature tensile strength all greater than 170MPa, being higher than the MgAlMn such as AM60B far away is diecast magnesium alloy, has good resistance toheat, simultaneously referring to embodiment 1 and comparative example, the Mg alloy castings that the embodiment of the invention provides is compared with the diecast magnesium alloy that does not add Nb, has better resistance toheat; The tensile strength of embodiment 1,7,8 under 200 ℃ of high temperature is better than other embodiment, and the scope of embodiment 1,7,8 each component is in Al 4.4-6.5%, Mn 0.26-0.6%, Gd 0.1-0.8%, Nb 0.05-0.6%; By the contrast between the embodiment 8-10, there is the effect of Gd better among the RE that contains as can be known; The Mg alloy castings that embodiment 1 provides tensile strength under 200 ℃ of high temperature is the highest, and the Mg alloy castings thermotolerance that embodiment 1 provides is the strongest.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. a heat resistance casting magnesium alloy is characterized in that, described magnesium alloy is comprised of Mg, Al, Mn, rare earth and Nb, and its weight percent consists of Al 1.5-25%, Mn 0.13-2%, rare earth 0.001-16%, Nb 0.001-4%, and all the other are Mg.
2. magnesium alloy according to claim 1 is characterized in that, described rare earth is at least a among Gd, Y, Sc, 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, Sc, Sm, Nd, La, Ce, Tb, Dy, Ho and the Er.
4. each described magnesium alloy is characterized in that according to claim 1-3, and its weight percent consists of Al 1.6-6.5%, Mn 0.13-0.7%, Gd 0.1-2%, Nb 0.05-1%, and all the other are Mg.
5. each described magnesium alloy is characterized in that according to claim 1-4, and its weight percent consists of Al 4.4-6.5%, Mn 0.26-0.6%, Gd 0.1-0.8%, Nb 0.05-0.6%, and all the other are Mg.
6. each described magnesium alloy is characterized in that according to claim 1-5, and its weight percent consists of Al 6.2%, Mn 0.4%, Gd 0.5%, Nb 0.2%, and all the other are Mg.
7. magnesium alloy according to claim 1 is characterized in that, described Nb adds in the described magnesium alloy by the form of AlNb master alloy or NbAl master alloy.
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|---|---|---|---|
| CN201110267052.1A CN102994839B (en) | 2011-09-09 | 2011-09-09 | Heatproof casting magnesium alloy |
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|---|---|---|---|
| CN201110267052.1A CN102994839B (en) | 2011-09-09 | 2011-09-09 | Heatproof casting magnesium alloy |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104250699A (en) * | 2014-10-01 | 2014-12-31 | 无棣向上机械设计服务有限公司 | Niobium-containing corrosion-resistant magnesium alloy |
| CN108588524A (en) * | 2018-07-23 | 2018-09-28 | 上海交通大学 | A kind of metal mold gravity casting magnesium alloy materials and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1276276A (en) * | 1999-06-08 | 2000-12-13 | 三井金属矿业株式会社 | Metal die device, die-casting method and die-cast articles |
| JP2004068110A (en) * | 2002-08-08 | 2004-03-04 | National Institute Of Advanced Industrial & Technology | Heat resistant magnesium alloy and method for producing the same |
| CN101512027A (en) * | 2006-09-01 | 2009-08-19 | 独立行政法人产业技术综合研究所 | High-strength flame resistant magnesium alloy |
-
2011
- 2011-09-09 CN CN201110267052.1A patent/CN102994839B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1276276A (en) * | 1999-06-08 | 2000-12-13 | 三井金属矿业株式会社 | Metal die device, die-casting method and die-cast articles |
| JP2004068110A (en) * | 2002-08-08 | 2004-03-04 | National Institute Of Advanced Industrial & Technology | Heat resistant magnesium alloy and method for producing the same |
| CN101512027A (en) * | 2006-09-01 | 2009-08-19 | 独立行政法人产业技术综合研究所 | High-strength flame resistant magnesium alloy |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104250699A (en) * | 2014-10-01 | 2014-12-31 | 无棣向上机械设计服务有限公司 | Niobium-containing corrosion-resistant magnesium alloy |
| CN108588524A (en) * | 2018-07-23 | 2018-09-28 | 上海交通大学 | A kind of metal mold gravity casting magnesium alloy materials and preparation method thereof |
| CN108588524B (en) * | 2018-07-23 | 2020-09-15 | 上海交通大学 | Metal gravity casting magnesium alloy material and preparation method thereof |
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