CN1475592A - High Zinc aluminium rare earth magnesium alloy - Google Patents
High Zinc aluminium rare earth magnesium alloy Download PDFInfo
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- CN1475592A CN1475592A CNA031283128A CN03128312A CN1475592A CN 1475592 A CN1475592 A CN 1475592A CN A031283128 A CNA031283128 A CN A031283128A CN 03128312 A CN03128312 A CN 03128312A CN 1475592 A CN1475592 A CN 1475592A
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Abstract
A high-Zn and-Al REMg alloy contains Zn (7-14 wt.%), A (3-8), RE (0.3-1.5) and Mg (rest). It is prepared through smelting in electric crucible furnace while covering with Mg alloy. It has fire point temp of more than 740 deg.c, tension strength (200-260 MPa) and elongation (1.4-3%).
Description
Technical field
The high zinc-aluminium magnesium-rare earth that the present invention relates to not contain Be and can be directly exposed to melting in the atmosphere.
Background technology
Magnesium alloy is a lightest current metal engineering material, and their application has expanded to civil use industries such as automobile, electronics, communication, household electrical appliances from aerospace industry, and market potential is huge.Existing magnesium alloy kind is more, and according to the chemical ingredients in ASTM, ISO and the GB standard, scientific and technical personnel are divided into magnesium-aluminium, magnesium-zinc, magnesium-rare earth and magnesium-lithium four big series to them.Domestic AZ5 commonly used and AZ90 all are under the jurisdiction of magnesium-aluminium system (containing Al7.5～9.0%).
; the standard formation reaction free energy of magnesium oxide (Δ G °) is extremely low; the aerial ignition temperature of pure magnesium (vigorous oxidation temperature) is about 530 ℃; the AZ5 commonly used and the point of ignition of AZ91D diecast magnesium alloy also have only 550～600 ℃, far below magnesium alloy necessary temperature of superheat (680～740 ℃) in melting and forming process.Vigorous oxidation in melting and the forming process not only causes a large amount of magnesium alloy scaling loss, and the oxide compound that is produced thus can remain in the material, and the mechanical property of material and corrosion resistance nature are descended significantly.In order to solve this contradiction, scientific and technical personnel set about from technology, equipment and alloy three aspects often, avoid as far as possible or weaken the catastrophic oxidation of magnesium alloy.
Flux protection and SF
6Gas shield is two kinds of methods that the melting magnesium alloy often adopts.When adopting the flux protection method, part flux will be deposited to the crucible bottom caking, and a spot of flux also can be suspended in the liquid magnesium alloy, causes the degradation of material.And the secondary oxidation of magnesium alloy when flux method also can't prevent to pour into a mould, so that this method is used in batch process is less.SF
6Gas protection method is the method that extensively adopts during Mg alloy castings is produced both at home and abroad at present, and its protection is respond well.But it can produce huge Greenhouse effect to the earth, now is faced with disabled situation.
Production reality at magnesium alloy die casting in enormous quantities; the external Totally-enclosed-type processing units of just being devoted to develop and use the collection fusing and being die cast as one, employing protection of inert gas; obtained obvious effects, and adopted, domesticly also followed in its footsteps by part producing producer.But the investment of expensive disposable apparatus, and strict technical requirements make many medium and small sized enterprises temporarily can't accept.
Under the more susceptible condition, then be to wish by changing the chemical ingredients of material, so that obtain to have the magnesium alloy of high point of ignition.Add 3% Ca in the pure magnesium, the point of ignition that can make magnesium is near 750 ℃, and its reason is to be in alloy liquid and CaO film between the MgO to have stoped contacting of magnesium and air.But after the add-on of Ca surpasses 1%, can worsen the mechanical property of magnesium alloy.The Be of adding 0.1%～0.8% can improve about 250 ℃ with the point of ignition of magnesium alloy, makes it to be directly exposed to melting in the atmosphere.Its mechanism is the continuation oxidation that fine and close BeO film can stop liquid magnesium alloy effectively.But adding Be equally also can cause the unit elongation of material to descend, and very harmful to human body of the dust of Be and oxide compound, and Be standing stock on earth are minimum, this rare metal are applied in large quantities in the actual production of Mg alloy castings, and are both unrealistic also uneconomical.
Zn, Al are the common element in the magnesium alloy, improve Zn, the Al content in magnesium alloy, necessary temperature of superheat in the time of can reducing melting, thereby the dynamic conditions of weakening magnesium alloy vigorous oxidation.But the Zn content in the standard brand magnesium alloy is generally not high, even in magnesium-zinc series, its content also≤6%.The inventor once brought up to 15%～25% with the Zn content in the magnesium alloy; the ignition temperature of this kind material can 〉=720 ℃; can directly melting in atmospheric environment, and protection flux floats on the liquid side all the time, really plays preventing that magnesium alloy from continuing the effect of oxidation.The tensile strength of material reaches 140～160Mpa.Simultaneously also studied the influence of aluminium, the intensity of this material is improved about 20% again the high-zinc magnesium alloy mechanical property.But the add-on of Al is too much, can reduce mechanical property on the contrary.On its result is published in 2000 respectively " Special Processes of Metal Castings and non-ferrous alloy " and calendar year 2001 " casting " magazine.
The advantageous effect of rare earth in magnesium alloy constantly is familiar with by people and grasped, and now developed a series of magnesium alloy that contain rare earth (Re), and they can have performances such as high-strength or heat-resisting or anti-corrosion, and development potentiality is very big.Simultaneously, baroque Mg-Re-Al-O oxide film can stop the continuation oxidation of liquid magnesium alloy, also plays a positive role to improving the magnesium alloy ignition temperature.
Summary of the invention
The object of the present invention is to provide a kind of high zinc-aluminium magnesium-rare earth.This alloy ignition temperature height does not contain Be and the direct good mechanical performance of melting and material in atmospheric environment.
High zinc-aluminium magnesium-rare earth of the present invention, its weight percent consists of zinc 7～14%, aluminium 3～8%, rare earth 0.3～1.5%, and all the other are magnesium and unavoidable impurities.
Described high zinc-aluminium magnesium-rare earth, its weight percent consists of zinc 9～12%, aluminium 4～6%, rare earth 0.5～1.0%, and all the other are magnesium and unavoidable impurities.
Electrical crucible is adopted in the melting of high zinc-aluminium magnesium-rare earth of the present invention, uses commercial magnesium alloy covering flux, need not to add the Be element or adopts gas shield, directly carries out in atmospheric environment, and rare earth adds with the form of master alloy.The ignition temperature of the magnesium alloy materials that obtains 〉=740 ℃.Adopt the coupon of permanent mold casting, as cast condition tensile strength σ
b〉=200MPa, unit elongation δ 〉=1.4%.Through after the solution heat treatment, intensity σ
b〉=260MPa, unit elongation δ 〉=3%.
The result of X-ray diffraction analysis shows that this kind magnesium alloy microstructure member is: Mg based solid solution, Mg-Zn, Mg-Al, Mg-Zn-Al compound, and the Mg-Zn-Al compound that contains rare earth.Part Zn, Al, rare earth dissolve among the Mg, play the solution strengthening effect, also crystal grain thinning significantly of rare earth simultaneously, and therefore, the intensity of material improves.But compound belongs to hard crisp phase, and especially Mg-Al compound (γ phase) easily gathers partially on crystal boundary, will cause the unit elongation of material to descend.Through after the solution heat treatment, majority of compounds is decomposed, and eutectic product amount reduces, and the compound of Xing Chenging then is distributed on the Mg based solid solution with the disperse shape again, so the intensity of material, unit elongation improve simultaneously.Result of study proves, if Zn, Al content are less, not only ignition temperature is on the low side, and the intensity of material is not high yet.If Zn, Al too high levels, intermetallic compound is too many, and the then fragility of material aggravation is even through solution heat treatment, also can't make unit elongation surpass 1%.
The invention has the advantages that this magnesium alloy has high ignition temperature, only need to use a spot of protection flux just can prevent the vigorous oxidation of magnesium alloy effectively, molten metal can directly melting in atmospheric environment.Can adopt equipment or frock production foundry goods such as common cold-chamber die casting machine, or metal mold.The enterprise and the workshop that have had aluminium alloy smelting and shaping frock need not big input again, just can produce the product of this kind magnesium alloy.
Description of drawings
Fig. 1 high zinc-aluminium magnesium-rare earth gamma-rays diffractogram of the present invention.
Embodiment
This high zinc-aluminium magnesium-rare earth embodiment 1～4
Starting material are pure magnesium, pure zinc, fine aluminium and rare earth intermediate alloy.Adopt the electrical crucible melting, 700 ℃ of smelting temperatures, thermocouple temperature measurement; 2% magnesium alloy covering agent, 1% magnesium alloy alterant.Metal pattern cast tensile test bar.In cabinet-type electric furnace, carry out solution heat treatment.Its chemical ingredients and mechanical property are listed in the table 1.
The chemical ingredients and the mechanical property of the high zinc-aluminium magnesium-rare earth of table 1
Claims (2)
1, a kind of high zinc-aluminium magnesium-rare earth is characterized in that this magnesium alloy weight percent consists of zinc 7～14%, aluminium 3～8%, rare earth 0.3～1.5%, and all the other are magnesium and unavoidable impurities.
2, magnesium alloy as claimed in claim 1 is characterized in that this magnesium alloy weight percent consists of zinc 9～12%, aluminium 4～6%, rare earth 0.5～1.0%, and all the other are magnesium and unavoidable impurities.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03128312 CN1227382C (en) | 2003-07-11 | 2003-07-11 | High zinc aluminium rare earth magnesium alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03128312 CN1227382C (en) | 2003-07-11 | 2003-07-11 | High zinc aluminium rare earth magnesium alloy |
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| Publication Number | Publication Date |
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| CN1475592A true CN1475592A (en) | 2004-02-18 |
| CN1227382C CN1227382C (en) | 2005-11-16 |
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| CN 03128312 Expired - Fee Related CN1227382C (en) | 2003-07-11 | 2003-07-11 | High zinc aluminium rare earth magnesium alloy |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100436636C (en) * | 2006-12-19 | 2008-11-26 | 武汉理工大学 | Magnesium alloy heat treatment process with combined current treatment |
| CN100532605C (en) * | 2007-12-06 | 2009-08-26 | 中国科学院长春应用化学研究所 | Magnesium-zinc-scandium alloy and method for preparing same |
| CN101235453B (en) * | 2008-02-29 | 2010-09-29 | 重庆大学 | Self-strengthening high-zinc heat-resistant magnesium alloy |
| CN102181760A (en) * | 2011-05-10 | 2011-09-14 | 嘉瑞科技（惠州）有限公司 | Magnesium alloy containing multiple trace rare earths |
-
2003
- 2003-07-11 CN CN 03128312 patent/CN1227382C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100436636C (en) * | 2006-12-19 | 2008-11-26 | 武汉理工大学 | Magnesium alloy heat treatment process with combined current treatment |
| CN100532605C (en) * | 2007-12-06 | 2009-08-26 | 中国科学院长春应用化学研究所 | Magnesium-zinc-scandium alloy and method for preparing same |
| CN101235453B (en) * | 2008-02-29 | 2010-09-29 | 重庆大学 | Self-strengthening high-zinc heat-resistant magnesium alloy |
| CN102181760A (en) * | 2011-05-10 | 2011-09-14 | 嘉瑞科技（惠州）有限公司 | Magnesium alloy containing multiple trace rare earths |
| CN102181760B (en) * | 2011-05-10 | 2013-01-02 | 嘉瑞科技（惠州）有限公司 | Magnesium alloy containing multiple trace rare earths |
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| Publication number | Publication date |
|---|---|
| CN1227382C (en) | 2005-11-16 |
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