CN102994839B - Heatproof casting magnesium alloy - Google Patents
Heatproof casting magnesium alloy Download PDFInfo
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- CN102994839B CN102994839B CN201110267052.1A CN201110267052A CN102994839B CN 102994839 B CN102994839 B CN 102994839B CN 201110267052 A CN201110267052 A CN 201110267052A CN 102994839 B CN102994839 B CN 102994839B
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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 system heat resistance casting magnesium alloy.
Background technology
Along with the development of science and technology, taking automobile as the weight of vehicles needs by alleviating vehicle body of representative, researching and developing the product innovation that fuel availability is higher further.In automobile industry, magnesium alloy, as a kind of novel lightweight metal material, is used for alternative traditional cast iron by automaker, to realize the object alleviating tare.
At present, the domestic MgAlMn system diecast magnesium alloy trade mark has YM202, YM203, YM204, YM205; The MgAlMn system diecast magnesium alloy trade mark of USS ASTM B has AM50A, AM60A, AM60B; The MgAlMn system diecast magnesium alloy trade mark of Nippon Standard JIS H has MDC2B, MDC4, MDC5; The MgAlMn system diecast magnesium alloy trade mark of European standard EN has EN-MC21210, EN-MC21220, EN-MC21230.The alloy of these trades mark, mobility, mechanical property, die casting are all very excellent.
Realizing in process of the present invention, contriver finds that prior art at least exists following problem: some parts on automobile, as: gear box, engine case lid etc., working temperature is higher, and also there is light-weighted demand.But above-mentioned MgAlMn series magnesium alloy is because β phase in alloy structure is with Mg
17al
12be main, Mg
17al
12fusing point is lower, non-refractory, and above-mentioned MgAlMn series magnesium alloy is only tens MPa in the tensile strength under 200 DEG C of high temperature, and therefore its parts produced are unsuitable for working in high temperature environments, thus cannot meet 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, embodiments provide 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 made up of Mg, Al, Mn, rare earth (RE) and Nb, its weight percent consists of Al 1.5-25%, Mn 0.13-2%, rare earth 0.001-16%, Nb 0.001-4%, all the other are Mg, and described Nb is added in described magnesium alloy by the form of AlNb master alloy or NbAl master alloy.
Wherein, described rare earth is at least one in Gd, Y, Sc, Sm, Nd, La, Ce, Tb, Dy, Ho and Er.
Preferably, described rare earth is at least one in Gd or Gd and Y, Sc, Sm, Nd, La, Ce, Tb, Dy, Ho and 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.
The magnesium alloy that the embodiment of the present invention provides is made into cast magnesium alloys by three kinds of melting technologies that this area is conventional, and wherein die casting can not be heat-treated, and the cast member of other form can be heat-treated, general employing T4 solution treatment.
The beneficial effect that the technical scheme that the embodiment of the present invention provides is brought is: in cast magnesium alloys provided by the invention, because RE can form MgRE compound with Mg, Nb can form some resistant to elevated temperatures metallic compounds with other elements (as Al), these metallic compounds are distributed on crystal boundary, instead of part Mg
17al
12β phase, changes the structure of β phase, thus improves the resistance to elevated temperatures of cast magnesium alloys, obtain a kind ofly have that excellent mechanical property, machinability are good, heat-proof compression casting magnesium alloy that mobility, die casting are good.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the microscopic appearance SEM photo of fracture surface of sample of stretching under the diecast magnesium alloy normal temperature provided in the embodiment of the present invention 3;
Fig. 2 is the microscopic appearance SEM photo of fracture surface of sample of stretching at the diecast magnesium alloy 200 DEG C provided in the embodiment of the present invention 3.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
The manufacture craft of the magnesium alloy that the embodiment of the present invention provides, heat treating method are described as follows:
1, the magnesium alloy that the embodiment of the present invention provides makes by following three kinds of melting technologies:
Technique one: the magnesium alloy composition provided according to the embodiment of the present invention and cubage also get out the starting material of aequum; magnesium ingot, aluminium ingot, MgMn master alloy and AlNb master alloy or NbAl master alloy is added in resistance furnace; heat up to resistance furnace used, adopt gas shield or magnesium alloy covering agent protection when the above-mentioned metal added melts soon.Add MgRE master alloy (as MgGd, MgY, MgNd etc.) or AlRE master alloy when being warmed up to 720 DEG C-780 DEG C, and stir, 720 DEG C-780 DEG C standing insulations 30 minutes, obtain aluminium alloy.Water a fritter sample with gained aluminium alloy, detect its Melting Quality, as: carry out gas content inspection according to gas content inspection method, if second-rate, need refining treatment be carried out; If up-to-standard, described aluminium alloy temperature adjustment skimmed to 700 DEG C-740 DEG C, then pours into a mould, namely obtain the foundry goods of alloy of the present invention.
In this technique, resistance furnace also can replace with other smelting furnaces; 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 market products; Refining treatment method adopts the ordinary method of the industry.
Technique two: the magnesium alloy composition provided according to the embodiment of the present invention and cubage also get out the starting material of aequum, add aluminium ingot, Mn or Mn agent, AlNb master alloy or NbAl master alloy in a vacuum furnace, be warming up to 820 DEG C, insulation 2-8 hour, then cool to 720 DEG C-780 DEG C, add magnesium ingot and RE.720 DEG C-780 DEG C insulations 30 minutes after added melting of metal, obtain aluminium alloy, adopt gas shield or magnesium alloy covering agent protection to prevent aluminium alloy to be oxidized.Water a fritter sample with gained aluminium alloy, detect its Melting Quality, as: the inspection of gas content, if second-rate, need refining treatment be carried out; If up-to-standard, described aluminium alloy temperature adjustment skimmed to 700 DEG C-740 DEG C, then pours into a mould, namely obtain the foundry goods of alloy of the present invention.
In this technique, vacuum oven can substitute with other smelting furnaces such as main frequency furnaces; 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 market; Refining treatment method adopts the ordinary method of the industry.
Technique three: the magnesium alloy composition provided according to the embodiment of the present invention and cubage also get out the starting material of aequum; add standard brand MgAlMn system's diecast magnesium alloy and AlNb master alloy or NbAl master alloy in a furnace, when above-mentioned metal melts soon, adopt gas shield or magnesium alloy covering agent protection.Add MgRE master alloy (as MgGd, MgY, MgNd etc.) or AlRE master alloy when being warmed up to 720 DEG C-780 DEG C, and stir, 720 DEG C-780 DEG C standing insulations 30 minutes, obtain aluminium alloy.Water a fritter sample with gained aluminium alloy, detect its Melting Quality, as: carry out gas content inspection according to gas content inspection method, if second-rate, need refining treatment be carried out; If up-to-standard, described aluminium alloy temperature adjustment skimmed to 700 DEG C-740 DEG C, then pours into a mould, namely obtain the foundry goods of alloy of the present invention.
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, MgRE or AlRE master alloy, Mn agent are sell goods on market; Refining treatment method adopts the ordinary method of the industry.
2, the thermal treatment of magnesium alloy that provides of the embodiment of the present invention and treatment process thereof:
Die casting in the cast magnesium alloys that the embodiment of the present invention provides can not be heat-treated, and the cast member of other form can be heat-treated, general employing T4 solution treatment.T4 solid solution treatment process is: cast member is warming up to 360-480 DEG C in chamber type electric resistance furnace, insulation 1-30 hour, cast member come out of the stove after shrend, water temperature 20-80 DEG C.
The impact of some other inevitable factor in the purity of raw material and melting, castingprocesses is selected by fusion process, the cast magnesium alloys that the embodiment of the present invention provides can contain inevitable impurity, as Zn, Si, Cu etc., as long as weight percent≤0.5% of described inevitable total impurities in described magnesium alloy finished product, weight percent≤0.1% of single contaminant in described magnesium alloy finished product, would not cause obvious impact to the performance of magnesium alloy.
Embodiment 1
Prepare heat resistance magnesium alloy by step described in above-mentioned technique one, 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 the present embodiment provides is see table 1.
Embodiment 2
Prepare heat resistance magnesium alloy by step described in above-mentioned technique two, 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 (T4 solid solution treatment process) of foundry goods: cast member is warming up to 480 DEG C in chamber type electric resistance furnace, is incubated 1 hour, cast member come out of the stove after shrend, water temperature 80 DEG C.
The performance of the Mg alloy castings that the present embodiment provides is see table 1.
Embodiment 3
Prepare heat resistance magnesium alloy by step described in above-mentioned technique two, 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 (T4 solid solution treatment process) of foundry goods: cast member is warming up to 480 DEG C in chamber type electric resistance furnace, is incubated 8 hours, cast member come out of the stove after shrend, water temperature 80 DEG C.
The performance of the Mg alloy castings that the present embodiment provides is see table 1.
Embodiment 4
Prepare heat resistance magnesium alloy by step described in above-mentioned technique three, foundry goods adopts Hpdc, and 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 the present embodiment provides is see table 1.
Embodiment 5
Prepare heat resistance magnesium alloy by step described in above-mentioned technique two, 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 (T4 solid solution treatment process) of foundry goods: cast member is warming up to 360 DEG C in chamber type electric resistance furnace, is incubated 20 hours, cast member come out of the stove after shrend, water temperature 50 DEG C.
The performance of the Mg alloy castings that the present embodiment provides is see table 1.
Embodiment 6
Prepare heat resistance magnesium alloy by step described in above-mentioned technique two, 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 (T4 solid solution treatment process) of foundry goods: cast member is warming up to 400 DEG C in chamber type electric resistance furnace, is incubated 5 hours, cast member come out of the stove after shrend, water temperature 70 DEG C.
The performance of the Mg alloy castings that the present embodiment provides is see table 1.
Embodiment 7
Prepare heat resistance magnesium alloy by step described in above-mentioned technique one, 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 (T4 solid solution treatment process) of foundry goods: cast member is warming up to 460 DEG C in chamber type electric resistance furnace, is incubated 1 hour, cast member come out of the stove after shrend, water temperature 60 DEG C.
The performance of the Mg alloy castings that the present embodiment provides is see table 1.
Embodiment 8
Prepare heat resistance magnesium alloy by step described in above-mentioned technique two, 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 the present embodiment provides is see table 1.
Embodiment 9
Prepare heat resistance magnesium alloy by step described in above-mentioned technique two, foundry goods adopts Hpdc, and the weight percent of described magnesium alloy consists of Al 6.5%, Mn 0.6%, Gd0.4%, Nd 0.4%, Nb 0.6%, and all the other are Mg.
The performance of the Mg alloy castings that the present embodiment provides is see table 1.
Embodiment 10
Prepare heat resistance magnesium alloy by step described in above-mentioned technique two, 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 the present embodiment provides is see table 1.
Embodiment 11
Prepare heat resistance magnesium alloy by step described in above-mentioned technique two, 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 (T4 solid solution treatment process) of foundry goods: cast member is warming up to 400 DEG C in chamber type electric resistance furnace, is incubated 14 hours, cast member come out of the stove after shrend, water temperature 20 DEG C.
The performance of the Mg alloy castings that the present embodiment provides is see table 1.
Embodiment 12
Prepare heat resistance magnesium alloy by step described in above-mentioned technique one, 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 (T4 solid solution treatment process) of foundry goods: cast member is warming up to 480 DEG C in chamber type electric resistance furnace, is incubated 8 hours, cast member come out of the stove after shrend, water temperature 60 DEG C.
The performance of the Mg alloy castings that the present embodiment provides is see table 1.
Embodiment 13
Prepare heat resistance magnesium alloy by step described in above-mentioned technique two, 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 (T4 solid solution treatment process) of foundry goods: cast member is warming up to 400 DEG C in chamber type electric resistance furnace, is incubated 14 hours, cast member come out of the stove after shrend, water temperature 20 DEG C.
The performance of the Mg alloy castings that the present embodiment provides is see table 1.
Embodiment 14
Prepare heat resistance magnesium alloy by step described in above-mentioned technique two, 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 (T4 solid solution treatment process) of foundry goods: cast member is warming up to 440 DEG C in chamber type electric resistance furnace, is incubated 1 hour, cast member come out of the stove after shrend, water temperature 60 DEG C.
The performance of the Mg alloy castings that the present embodiment provides is see table 1.
Embodiment 15
Prepare heat resistance magnesium alloy by step described in above-mentioned technique two, 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 (T4 solid solution treatment process) of foundry goods: cast member is warming up to 360 DEG C in chamber type electric resistance furnace, is incubated 30 hours, cast member come out of the stove after shrend, water temperature 40 DEG C.
The performance of the Mg alloy castings that the present embodiment provides is see table 1.
Comparative example
Prepare heat resistance magnesium alloy by step described in above-mentioned technique one, 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 the present embodiment provides is see table 1.
The Mg alloy castings that theres is provided of each embodiment is all containing inevitable impurity above, weight percent≤0.5% of described inevitable total impurities in described magnesium alloy finished product, weight percent≤0.1% of single contaminant in described magnesium alloy finished product.
The Mechanics Performance Testing of foundry goods is carried out on electronic universal tester.The mechanical property of the Mg alloy castings that various embodiments of the present invention and comparative example provide is see table 1.
The mechanical property parameters table of the Mg alloy castings that each embodiment of table 1 provides
As shown in Table 1, the Mg alloy castings that the embodiment of the present invention provides tensile strength under 200 DEG C of high temperature is all greater than 170 MPa, far away higher than MgAlMn system diecast magnesium alloys such as AM60B, there is good resistance toheat, simultaneously see embodiment 1 and comparative example, the Mg alloy castings that the embodiment of the present invention provides, compared with not adding the diecast magnesium alloy of Nb, has better resistance toheat; The tensile strength of embodiment 1,7,8 under 200 DEG C of high temperature is better than other embodiments, and the scope of each component of embodiment 1,7,8 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 embodiment 8-10, in the known RE contained, there is the effect of Gd better; The Mg alloy castings that embodiment 1 provides tensile strength under 200 DEG C of high temperature is the highest, and the Mg alloy castings thermotolerance that embodiment 1 provides is the strongest.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a heat resistance casting magnesium alloy, it is characterized in that, described magnesium alloy is made up of Mg, Al, Mn, rare earth and Nb, its weight percent consists of Al 1.5-25%, Mn 0.13-2%, rare earth 0.001-16%, Nb 0.001-4%, all the other are Mg, and described Nb is added in described magnesium alloy by the form of AlNb master alloy or NbAl master alloy.
2. magnesium alloy according to claim 1, is characterized in that, described rare earth is at least one in Gd, Y, Sc, Sm, Nd, La, Ce, Tb, Dy, Ho and Er.
3. magnesium alloy according to claim 1 and 2, is characterized in that, described rare earth is at least one in Gd or Gd and Y, Sc, Sm, Nd, La, Ce, Tb, Dy, Ho and Er.
4. magnesium alloy according to claim 3, is characterized in that, its weight percent consists of Al 1.6-6.5%, Mn0.13-0.7%, Gd 0.1-2%, Nb 0.05-1%, and all the other are Mg.
5. magnesium alloy according to claim 4, is characterized in that, its weight percent consists of Al 4.4-6.5%, Mn0.26-0.6%, Gd 0.1-0.8%, Nb 0.05-0.6%, and all the other are Mg.
6. magnesium alloy according to claim 5, is characterized in that, its weight percent consists of Al 6.2%, Mn 0.4%, Gd 0.5%, Nb 0.2%, and all the other are Mg.
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| CN201110267052.1A CN102994839B (en) | 2011-09-09 | 2011-09-09 | Heatproof casting magnesium alloy |
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| 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 |
| CN108588524B (en) * | 2018-07-23 | 2020-09-15 | 上海交通大学 | Metal gravity casting magnesium alloy material and preparation method thereof |
Citations (2)
| 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 |
| 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 |
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| JP4154480B2 (en) * | 2002-08-08 | 2008-09-24 | 独立行政法人産業技術総合研究所 | Heat-resistant magnesium alloy and method for producing the same |
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Patent Citations (2)
| 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 |
| 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 |
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