CN100432259C - Die cast magnesium alloy with high fluidity and preparation method thereof - Google Patents
Die cast magnesium alloy with high fluidity and preparation method thereof Download PDFInfo
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- CN100432259C CN100432259C CNB2006100253941A CN200610025394A CN100432259C CN 100432259 C CN100432259 C CN 100432259C CN B2006100253941 A CNB2006100253941 A CN B2006100253941A CN 200610025394 A CN200610025394 A CN 200610025394A CN 100432259 C CN100432259 C CN 100432259C
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Abstract
The present invention relates to die cast magnesium alloy with high fluidity and a preparation method, which is characterized in that the alloy has the components by weight percentage of 9.0% to 10.5% of Al, 0.1% to 2.0% of Ca, 0.1% to 2.0% of Sr, 0.1% to 1.0% of Ce, 0.05% to 0.5% of La, 0.02% to 0.5% of Nd, 0.2% to 1.0% of Zn, 0.2% to 0.4% of Mn, <=0.2% of foreign matter and Mg as the rest. The preparation method is characterized in that a mixed material is firstly formed according to the weight percentage of the alloy and then the mixed material is smelted under the protection of the mixed atmosphere of CO2+SF6 at the smelting temperature of 720 DEG C to 740 DEG C and at the casting temperature of 700 DEG C to 720 DEG C. Compared with the fluidity of AZ91 magnesium alloy, the fluidity of the alloy provided by the present invention is enhanced by more than 40%. The provided alloy is suitable for casting in a die casting mode and is suitable for semisolid molding casting, sand type or metal type heavy casting or low pressure casting.
Description
Technical field
The present invention relates to a kind of diecast magnesium alloy and preparation method of high workability, belong to the magnesium alloy field.
Background technology
Magnesium alloy has that light weight is firm, antidetonation noise control, electromagnetic shielding and easy many premium propertiess such as casting, therefore magnesium alloy is especially suitable for use as and comprises computer, communication and consumption electronic product (computer, communication, consumer electronics products) thin-gage goods such as so-called " 3C " product such as.Along with the electronic information industrial expansion, the application of magnesium alloy in the 3C Product housing obtains fast development, and its annual growth is up to more than 20%, and magnesium alloy is very wide in the application prospect in this field.
Have the 3C Product housing of thin-wall construction with the magnesium alloy manufacturing, adopt die casting or jetting formation process production usually, more require magnesium alloy that good castability is arranged.Though existing magnalium is easy to die casting, (thickness＜1mm), it is not enough that its casting fluidity is still disliked, and this just has influence on the yield rate and the surface quality of 3C Product for thin-wall case.Current electronics and IT products industry adopts flowability AZ91D (Mg-9Al) magnesium alloy pressure-casting making preferably electronic product casing usually.And the shaping finished product rate of thin-walled magnesium goods generally has only 70～80%, ubiquitous problem is that low, the surperficial visual appearance of good article rate is not good enough, streamline vestige, spot, casting flaw such as loose appear in surface easily, be difficult to guarantee the smooth specification of quality of 3C Product any surface finish, and bring very big surface dressing work load, seriously restrict the throughput of magnesium product enterprise, strengthened production cost.Therefore, research and development and application have the high infiltrating novel diecast magnesium alloy of high workability, for the yield rate, surface quality and the throughput that improve 3C magnesium product enterprise, reduce production costs significantly, also are the active demands of electronics and IT products enterprise.
United States Patent (USP) United States Patent 6,582,533. " magnesium alloys excellent influidity and materials thereof " a kind of magnesium alloy with excellent fluidity of proposition, it contains: (weight percentage) Al:10.0～13.0%, Si:0.3～1.5%, Mn:0.1～1.0%, Zn:＜0.8%, all the other are Mg and unavoidable impurities.This alloy is owing to contain very high Al content, and Al promotes mobile element, so its flowability should be fine, but up to the magnesium alloy of 10～13% Al, its plasticity is too poor, and material is too crisp, and is obviously improper for the application of 3C Product housing.
Similar therewith application, application number is that 02143587.1 Chinese patent application proposes a kind of " mobile excellent magnesium alloy and material thereof ", it contains: Al:10.0～12.8%, Si:0.4～1.4%, Mn:0.1～0.9%, in the mass percent total amount is Be, Ca, Sr, Ba and Mesh (sic probably the refers to mishmetal) gold of 20ppm～800ppm
In the genus one or both or multiple, all the other are Mg and unavoidable impurities, and the raising of its flowability still mainly relies on the adding of Al content, and all the other addition elements belong to trace basically, influence can be very not big, and high alumina causes that the embrittlement of material obviously also is the important restraining factors of using.
Application number 03150926.6 application proposes a kind of mobile lost foam casting magnesium alloy and melting method thereof, its alloy is on AZ91 (Mg-9Al) alloy basis, improve the Al content of alloy, reduce Zn content, add rich Ce mishmetal and Ti element, the also an amount of metal Be element that adds, obtain mobile and all good magnesium alloy of mechanical property, but this patent contains and has supervirulent Be element, also contains the Ti element that solidity to corrosion is brought deleterious effect, therefore this alloy ideal very.
Summary of the invention
The object of the invention is to provide a kind of die-casting magnalium alloy and preparation method of high workability.The Mg-Al alloy that provides has high workability and good mechanical performance.Alloy compositions provided by the invention (by the quality percentage composition, wt%) be:
Al:9.0～10.5; Ca:0.1～2.0; Sr:0.1～2.0%; Ce:0.1～1.0%; La:0.05～0.5%; Nd:0.02～0.5%; Zn:0.2～1.0%; Mn:0.2～0.4%, surplus are Mg and unavoidable impurities.(unavoidable impurities content≤0.2%)
Alloy is at CO
2+ SF
6Mixed atmosphere protection melting down.SF in the protective atmosphere
6Content be CO
2Amount be 1/200～1/100.Ca that adds in the alloy or Sr can be with industrial pure metal, Ca-Mg or Sr-Mg master alloys.The rare earth element that adds in the alloy can or contain Ce with the metal of rich Ce, rich La, rich Nd, La, and its ratio of Nd is similar to Ce: La: Nd ≈ 4～6: 2～4: 1～2 mishmetal.The smelting temperature of alloy is 720～740 ℃, and teeming temperature is 700～720 ℃.
The alloy that is provided has good flowability and excellent mechanical property (seeing table 1 and table 2 for details).The flowability of alloy is to measure by device shown in Figure 1, characterizes the flowability of alloy with the length of measuring liquid magnesium alloy mobile after coagulation in the cavity of resorption circular hole of pouring into a mould.The result shows that the flowability of magnesium-aluminum alloy provided by the invention has improved (asking for an interview embodiment in detail describes) more than 40% than present general AZ91 magnesium alloy, and Mg-Al alloy provided by the invention is not only applicable to die-cast and is applicable to the semi-solid state shape casting and sand mold or heavy casting of metal mold or low-pressure casting.
Description of drawings
Fig. 1 measures the test mould synoptic diagram of magnesium alloy flowability, (a) front view, (b) vertical view, among the figure 1, go up sprue gate punching block 2, three diameters are cavity of resorption 3, the pourer stopper of 5mm circular hole
Embodiment
Embodiment 1
At mixed gas (CO
2: SF
6=150: 1) protection down; melting patent magnesium alloy in the 10KG Mg-smelting furnace; its chemical ingredients of magnesium Al alloy of being prepared is by the proportioning molten alloy of Mg-9.5Al-0.5Ca-0.5Sr-0.5%Ce-0.3%La-0.2%Nd-0.5%Zn-0.3%Mn; the melting raw material is: technical pure metal M g; metal A l; metal Sr, Metal Zn and ratio are about: Ce: La: Nd=5: 3: 2 industrial rare earth, Al-Mn alloy (Mn is about 10%).Smelting temperature is about 720 ℃, and teeming temperature is about 700 ℃.Be cast into the handset shell that wall thickness is 0.8mm by the magnesium pressure die-casting machine.Also successfully with this alloy bits shape raw material, becoming wall thickness by the semi-solid state shaping mechanism is the magnesium alloy notebook computer casing parts of 0.6mm.
The casting fluidity of alloy is by homemade casting fluidity test mould (Fig. 1), and the flowability of measuring alloy is the ability that alloy is full of casting mold, and its measuring method is: 3 diameters of casting simultaneously in horizontal casting mold respectively are the excellent (see figure 1) of 5mm.Have the sample of casting in the stainless punching block on the pouring basin of pourer stopper on the sprue by crucible when promptly pouring into a mould.After having measured temperature pourer stopper is extracted, made magnesium alloy be full of the down horizontal mold of stainless steel, the flowability of magnesium alloy is that the length of 400 ℃ the stainless punching block magnesium alloy bar of casting is determined by pour into preheating under 720 ℃ of pouring temperatures.(the results are shown in table 1)
The comparison of table 1. embodiment 1 patent alloy and AZ91 magnesium alloy cast flowability
| Alloy | Mobile specimen length (mm) |
| The embodiment of the present application 1 | 31.65 |
| AZ91 | 21.50 |
The mensuration of mechanical property shows that the alloy that alloy of the present invention provides all is better than the AZ91 magnesium alloy.
The mechanical property of table 2. embodiment 1 patent alloy
* measure performance numerical value under the room temperature
Embodiment 2
By same smelting condition and the method for embodiment 1 and carry out fluidity testing.The patent alloy is pressed Mg-10%Al-1.5%Ca-0.5%Sr-1.0%Ce-0.6%La-0.4Nd-0.5%Zn-0.3%Mn proportioning molten alloy.Smelting temperature is 720 ℃, and teeming temperature is that 700 ℃ of its flowabilities and mechanical property are listed in table 3 and table 4 respectively.
The comparison of table 3 embodiment 2 patent alloys and AZ91 magnesium alloy cast flowability
| Alloy | Mobile specimen length (mm) |
| The embodiment of the present application 2 | 33.50 |
| AZ91 | 21.50 |
The mechanical property of table 4 embodiment 2 patent alloys
The result of embodiment shows: the casting fluidity of the application's patent alloy significantly is superior to general AZ91 alloy.And its flowability also quite and be higher than the AZ91 alloy.
Claims (8)
1, a kind of diecast magnesium alloy of high workability, the quality percentage composition that it is characterized in that described alloy is Al:9.0-10.5%, Ca:0.1-2.0%, Sr:0.1-2.0%, Ce:0.1-1.0%, La:0.05-0.5%, Nd:0.02-0.5%, Zn:0.2-1.0%, Mn:0.2-0.4%, impurity≤0.2%, surplus are Mg; The flowability of the alloy that is provided has improved more than 40% than present general AZ91 magnesium alloy.
2, by the diecast magnesium alloy of the described high workability of claim 1, the quality percentage composition that it is characterized in that alloy is Al:9.5%, Ca:0.5%, Sr:0.5%, Ce:0.5%, La:0.3%, Nd:0.2%, Zn:0.5%, Mn:0.3%, impurity≤0.2%, surplus is Mg.
3, by the diecast magnesium alloy of the described high workability of claim 1, the quality percentage composition that it is characterized in that alloy is Al:10%, Ca:1.5%, Sr:0.5%, Ce:1.0%, La:0.6%, Nd:0.4%, Zn:0.5%, Mn:0.3%, impurity≤0.2%, surplus is Mg.
4, preparation is characterized in that preparing burden by the quality percentage composition of alloy earlier, then at CO as the method for the diecast magnesium alloy of the described high workability of claim 1,2 or 3
2+ SF
6Mixed atmosphere protection melting down, smelting temperature is 720-740 ℃, teeming temperature is 700-720 ℃.
5, press the preparation method of the diecast magnesium alloy of the described high workability of claim 4, the CO that uses when it is characterized in that melting
2+ SF
6SF in the hybrid protection atmosphere
6Content be CO
2The 1/200-1/100 of amount.
6, press the preparation method of the diecast magnesium alloy of the described high workability of claim 4, it is characterized in that the Ca and the Sr that add in the alloy are technical pure metal or Ca-Mg and Sr-Mg master alloy.
7, press the preparation method of the diecast magnesium alloy of the described high workability of claim 4, it is characterized in that the rare earth element that adds in the alloy is the metal of rich Ce, rich La or rich Nd or is the mishmetal of Ce: La: Nd=4-6: 2-4: 1-2.
8,, it is characterized in that providing magnesium alloy to be applicable to a kind of in heavy casting of die-cast, semi-solid state shape casting, sand mold or metal mold or the low-pressure casting by the diecast magnesium alloy of the described high workability of claim 1,2 or 3.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006100253941A CN100432259C (en) | 2006-03-31 | 2006-03-31 | Die cast magnesium alloy with high fluidity and preparation method thereof |
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| CNB2006100253941A CN100432259C (en) | 2006-03-31 | 2006-03-31 | Die cast magnesium alloy with high fluidity and preparation method thereof |
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| CN1827816A CN1827816A (en) | 2006-09-06 |
| CN100432259C true CN100432259C (en) | 2008-11-12 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102061415B (en) * | 2011-01-19 | 2012-05-09 | 创金美科技（深圳）有限公司 | Die cast magnesium alloy with heat cracking resistance and high fluidity |
| CN102978495A (en) * | 2012-12-13 | 2013-03-20 | 北京大学 | Mg-Sr-Zn alloy and preparation method thereof |
| CN104651688A (en) * | 2014-06-30 | 2015-05-27 | 王晓芳 | Method for improving tensile strength and elongation rate of AZ91 magnesium alloy by adding rare earth Nd and Ce |
| CN106041015B (en) * | 2016-06-29 | 2017-12-12 | 宁波胜景传动科技有限公司 | A kind of reducer gear case end cap and preparation method thereof |
| WO2018116940A1 (en) * | 2016-12-21 | 2018-06-28 | 住友電気工業株式会社 | Magnesium alloy |
| CN108998713B (en) * | 2017-06-06 | 2020-10-23 | 比亚迪股份有限公司 | Magnesium alloy and preparation method and application thereof |
| CN110656270B (en) * | 2018-06-29 | 2021-11-12 | 比亚迪股份有限公司 | Die-casting magnesium alloy and preparation method and application thereof |
| CN115141948A (en) * | 2022-07-21 | 2022-10-04 | 重庆大学 | High-strength and high-toughness die-casting magnesium alloy |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1488772A (en) * | 2002-10-11 | 2004-04-14 | 株式会社日本制钢所 | Magnesium alloy with excellent fluidity and material thereof |
| CN1523128A (en) * | 2003-09-11 | 2004-08-25 | 上海交通大学 | High fluidity evaporative pattern casting magnesium alloy and smelting method thereof |
| CN1566386A (en) * | 2003-06-18 | 2005-01-19 | 北京有色金属研究总院 | Mg-Zn-Al based magnesium alloy and its smelting method |
| CN1637160A (en) * | 2004-01-09 | 2005-07-13 | 高田株式会社 | Die casting magnesium alloy and magnesium die casting |
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2006
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1488772A (en) * | 2002-10-11 | 2004-04-14 | 株式会社日本制钢所 | Magnesium alloy with excellent fluidity and material thereof |
| CN1566386A (en) * | 2003-06-18 | 2005-01-19 | 北京有色金属研究总院 | Mg-Zn-Al based magnesium alloy and its smelting method |
| CN1523128A (en) * | 2003-09-11 | 2004-08-25 | 上海交通大学 | High fluidity evaporative pattern casting magnesium alloy and smelting method thereof |
| CN1637160A (en) * | 2004-01-09 | 2005-07-13 | 高田株式会社 | Die casting magnesium alloy and magnesium die casting |
Non-Patent Citations (1)
| Title |
|---|
| 含稀土元素的Mg-Al合金在NaCl溶液中腐蚀产物膜的研究. 黄亮，黄元伟，王晨等.中国腐蚀与防护学报，第22卷第3期. 2002 * |
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