CN102994847A - Heatproof magnesium alloy - Google Patents
Heatproof magnesium alloy Download PDFInfo
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- CN102994847A CN102994847A CN2011102669825A CN201110266982A CN102994847A CN 102994847 A CN102994847 A CN 102994847A CN 2011102669825 A CN2011102669825 A CN 2011102669825A CN 201110266982 A CN201110266982 A CN 201110266982A CN 102994847 A CN102994847 A CN 102994847A
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Abstract
The invention discloses a heatproof magnesium alloy, which belongs to the magnesium alloy field. The magnesium alloy is composed of Mg, Zn, Zr, rare earth, Nb and Al, and comprises the following components by weight: 0.2-9% of Zn, 0.1-2% of Zr, 0.0002-16% of rare earth, 0.0002-4% of Nb, 0.001-1.49% of Al 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; the Zr can strongly refine the crystal grain, and is reacted with certain impurity element (such as Si) in an alloy liquid and deposited, and the alloy liquid is purified. The combined effect of the elements enhances the high temperature resistance performance of the magnesium alloy, the heatproof magnesium alloy has excellent mechanical property and machinery processability, and good fluidity and die casting performance, and is suitable for casting the heatproof magnesium alloy and die casting of the heatproof magnesium alloy.
Description
Technical field
The present invention relates to a kind of magnesium alloy, particularly a kind of high performance heat resistant magnesium alloy of suitable cast form.
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, the domestic cast magnesium alloys trade mark has ZM2, ZM3, ZM4, ZM6 etc.The alloy of these trades mark has: mechanical property, castability be good characteristics all, simultaneously, because ZM series magnesium alloy β contains the MgZr compound of a certain amount of higher melt or having concurrently of MgZr compound and MgRE compound in mutually, makes this magnesium alloy have certain resistance to elevated temperatures.Under normal temperature, ZM3 under as cast condition or as-heat-treated condition, its tensile strength R
mBe 120MPa, elongation A is under 1.5%, 200 ℃, its tensile strength R
mBe 110MPa, elongation A is 2%; ZM4 and for example, at normal temperatures, its tensile strength R
mBe 140MPa, elongation A is under 2%, 200 ℃, its tensile strength R
mBe 110MPa, elongation A is 2.5%.
In realizing process of the present invention, the contriver finds that there is following problem at least in prior art: along with development in science and technology, the Application Areas of magnesium alloy is more and more extensive, existing magnesium alloy can't satisfy the requirement of operation under hot environment more than 200 ℃, thereby, be badly in need of the better magnesium alloy of a kind of high thermal resistance.
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 magnesium alloy with good die casting.Described technical scheme is as follows:
A kind of heat resistance magnesium alloy, described magnesium alloy is comprised of Mg, Zn, Zr, rare earth (RE), Nb and Al, its weight percent consists of Zn 0.2%-9%, Zr 0.1%-2%, rare earth 0.0002%-16%, Nb 0.0002%-4%, Al 0.001%-1.49%, and all the other are Mg.
Wherein, described rare earth is at least a among Gd, Y, Sc, Pr, Yb, 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, Pr, Yb, Sm, Nd, La, Ce, Tb, Dy, Ho and the Er.
Preferably, its weight percent consists of Zn 0.2%-0.7%, Zr 0.4%-1%, Gd 0.1%-4%, Nb 0.05%-1%, Al0.03%-0.6%, and all the other are Mg.
Preferably, its weight percent consists of Zn 3.5%-5.5%, Zr 0.4%-1%, Gd 0.1%-4%, Nb 0.05%-1%, Al0.03%-0.6%, and all the other are Mg.
Preferably, its weight percent consists of Zn 7.5%-9%, Zr 0.5%-1%, Gd 0.1%-2.5%, Nb 0.05%-1%, Al0.04%-0.6%, and all the other are Mg.
Most preferably, its weight percent consists of Zn 0.6%, Zr 0.8%, Gd 2.2%, Nb 0.2%, Al 0.1%, and all the other are Mg.
Wherein, described Nb and Al add in the magnesium alloy by the form of NbAl master alloy or AlNb master alloy.
The beneficial effect that the technical scheme that the embodiment of the invention provides is brought is: in the magnesium alloy 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 changed the structure of β phase; The other strong crystal grain thinning of Zr, can also with aluminium alloy in some impurity element (as: Si) reaction and precipitation, purified aluminium alloy.The combined action of above-mentioned element has improved the resistance to elevated temperatures of magnesium alloy, has obtained a kind of good mechanical property that has, and machinability, flowability and die casting are good, and suitable casting especially is fit to the heat resistance magnesium alloy of die casting.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below embodiment of the present invention is described further in detail.
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 add magnesium ingot, zinc ingot metal, MgZr master alloy, NbAl master alloy or AlNb master alloy in resistance furnace.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.) 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 is argon gas; Magnesium alloy covering agent and master alloy product are the market sale product, during preparation low-aluminum-content alloy, the NbAl master alloy can be chosen the Al content product lower than Nb content, as: NbAl 80 and NbAl 75, their Al content is respectively 15%-20%, 20%-25%; 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 magnesium ingot, zinc ingot metal, MgZr master alloy, NbAl master alloy or AlNb master alloy, be warming up to 820 ℃, be incubated 2-8 hour, then cool to 720 ℃-780 ℃, add 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 is argon gas; Magnesium alloy covering agent, rare earth and 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; in smelting furnace, add the cast magnesium alloys (as among ZM2, ZM3, ZM4, the ZM6 at least a) and NbAl master alloy of standard brand, adopt gas shield or magnesium alloy covering agent protection when above-mentioned metal melts soon.Add MgRE master alloy (such as MgGd, MgY, MgNd etc.) 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 is argon gas in this technique; Magnesium alloy covering agent, master alloy 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 magnesium alloy that the embodiment of the invention provides is not heat-treated, and other cast member can be heat-treated, and generally adopts the T4 solution treatment.The thermal treatment of adopting in the embodiment of the invention is that the T4 solid solution treatment process is: cast member is warming up to 420 ℃ in chamber type electric resistance furnace, is incubated 8 hours, the cast member rear shrend of coming out of the stove, 40 ℃ of water temperatures.
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 Mg alloy castings that the embodiment of the invention provides can contain inevitable impurity, such as Fe, Ni, 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.
Embodiment 1
Prepare heat resistance magnesium alloy by above-mentioned technique one described step, foundry goods adopts die cast, and the weight percent of described magnesium alloy consists of Zn 0.2%, Zr 0.1%, Y 0.0002%, Nb 0.0002%, Al 0.001%, and all the other are Mg.
Foundry goods is heat-treated.
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 semi-solid casting, and the weight percent of described magnesium alloy consists of Zn 2%, Zr 1.5%, Sc 8%, Nb 3%, Al 1%, and all the other are Mg.
Foundry goods is heat-treated.
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 one described step, foundry goods adopts Hpdc, and the weight percent of heat resistance magnesium alloy consists of Zn 9%, Zr 2%, Sm 16%, Nb 4%, Al 1.49%, and all the other are Mg.
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 one described step, foundry goods adopts low-pressure casting, and the weight percent of described magnesium alloy consists of Zn 0.2%, Zr 0.4%, Nd 0.1%, Nb 0.05%, Al 0.03%, and all the other are Mg.
Foundry goods is heat-treated.
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 precision casting, and the weight percent of described magnesium alloy consists of Zn 0.7%, Zr 1%, La 4%, Nb 1%, Al 0.6%, and all the other are Mg.
Foundry goods is heat-treated.
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 one described step, foundry goods adopts sand mold casting, and the weight percent of described magnesium alloy consists of Zn 0.5%, Zr 0.5%, Gd 2%, Nb 0.5%, Al 0.3%, and all the other are Mg.
Foundry goods is heat-treated.
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 two described steps, foundry goods adopts Hpdc, and the weight percent of described magnesium alloy consists of Zn 0.5%, Zr 0.5%, Gd 1%, Ce%, Nb 0.5%, Al 0.3%, and all the other are Mg.
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 Zn 0.5%, Zr 0.5%, Ce 2%, Nb 0.5%, Al 0.3%, 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 Zn 3.5%, Zr 0.4%, Tb 0.1%, Nb 0.05%, Al 0.03%, 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 Zn 5.5%, Zr 1%, Dy 4%, Nb 1%, Al 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 three described steps, described standard brand diecast magnesium alloy used in the preparation process is ZM2, foundry goods adopts Hpdc, the weight percent of described magnesium alloy consists of Zn 4%, Zr 0.7%, (Ce+La) 1.7%, Nb 0.6%, Al 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 12
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 Zn 4%, Zr 0.7%, Gd 3%, Nb 0.6%, Al 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 13
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 Zn 7.5%, Zr 0.5%, Er 0.1%, Nb 0.05%, Al 0.04%, and all the other are Mg.
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 Hpdc, and the weight percent of described magnesium alloy consists of Zn 9%, Zr 1%, Pr 2.5%, Nb 1%, Al 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 15
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 Zn 8%, Zr 0.8%, Yb 1.5%, Nb 0.7%, Al 0.5%, and all the other are Mg.
The performance of the Mg alloy castings that present embodiment provides is referring to table 1.
Embodiment 16
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 Zn 0.6%, Zr 0.8%, Gd 2.2%, Nb 0.2%, Al 0.1%, and all the other are Mg.
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 Zn 0.6%, Zr 0.8%, Gd 2.2%, Al 0.1%, 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, the weight percent of described inevitable total impurities in described magnesium alloy finished product≤0.5%, single contaminant (such as Fe, Ni, Cu etc.) as described in weight percent≤0.1% in the magnesium alloy finished product.
The magnesium alloy that the embodiment of the invention provides is applicable to the forging types such as die cast, Hpdc, semi-solid casting, low-pressure casting, precision casting, sand mold casting.
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 180MPa, referring to embodiment 16 and comparative example, the Mg alloy castings that the embodiment of the invention provides is compared with the Mg alloy castings that does not add Nb, has better resistance toheat simultaneously; By the contrast between embodiment 6-8 and the embodiment 11,12, there is the effect of Gd better among the RE that contains as can be known; The Mg alloy castings that embodiment 16 provides tensile strength under 200 ℃ of high temperature is the highest, and the Mg alloy castings thermotolerance that embodiment 16 provides is the strongest.
In addition, alloy of the present invention can be used for the rolling deformation direction, and rolling technology routinely direction is processed.
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 (8)
1. heat resistance magnesium alloy, it is characterized in that, described magnesium alloy is comprised of Mg, Zn, Zr, rare earth, Nb and Al, and its weight percent consists of Zn 0.2%-9%, Zr 0.1%-2%, rare earth 0.0002%-16%, Nb 0.0002%-4%, Al0.001%-1.49%, 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, Pr, Yb, 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, Pr, Yb, 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 Zn 0.2%-0.7%, Zr 0.4%-1%, Gd 0.1%-4%, Nb 0.05%-1%, Al 0.03%-0.6%, and all the other are Mg.
5. each described magnesium alloy is characterized in that according to claim 1-3, and its weight percent consists of Zn 3.5%-5.5%, Zr 0.4%-1%, Gd 0.1%-4%, Nb 0.05%-1%, Al 0.03%-0.6%, and all the other are Mg.
6. each described magnesium alloy is characterized in that according to claim 1-3, and its weight percent consists of Zn 7.5%-9%, Zr 0.5%-1%, Gd 0.1%-2.5%, Nb 0.05%-1%, Al 0.04%-0.6%, and all the other are Mg.
7. magnesium alloy according to claim 4 is characterized in that, its weight percent consists of Zn 0.6%, Zr 0.8%, Gd 2.2%, Nb 0.2%, Al 0.1%, and all the other are Mg.
8. magnesium alloy according to claim 1 is characterized in that, described Nb and Al add in the described magnesium alloy by the form of NbAl master alloy or AlNb master alloy.
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| CN201110266982.5A CN102994847B (en) | 2011-09-09 | 2011-09-09 | Heatproof magnesium alloy |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104651693A (en) * | 2013-11-22 | 2015-05-27 | 北京有色金属研究总院 | Microscale Al-containing rare earth wrought magnesium alloy and preparation method thereof |
| CN105568104A (en) * | 2016-01-15 | 2016-05-11 | 何枇林 | Rare earth strengthened magnesium alloy and preparation method thereof |
| CN107201470A (en) * | 2017-05-10 | 2017-09-26 | 上海大学 | A kind of magnesium alloy for having high heat dispersion, excellent mechanical performances concurrently and preparation method thereof |
| CN108715964A (en) * | 2018-06-07 | 2018-10-30 | 河南科技大学 | A kind of magnesium-rare earth and preparation method thereof |
| CN109295369A (en) * | 2018-11-23 | 2019-02-01 | 上海交通大学 | One kind magnesium alloy containing cerium mischmetal and its heat treatment method |
| CN111057924A (en) * | 2020-01-05 | 2020-04-24 | 北京工业大学 | High-plasticity low-rare earth magnesium alloy and preparation method thereof |
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| JPH08134581A (en) * | 1994-11-14 | 1996-05-28 | Mitsui Mining & Smelting Co Ltd | Production of magnesium alloy |
| CN1699612A (en) * | 2004-05-19 | 2005-11-23 | 中国科学院金属研究所 | High strength and high toughness cast magnesium alloy and preparing process thereof |
| CN101386946A (en) * | 2008-10-31 | 2009-03-18 | 中国科学院上海微系统与信息技术研究所 | Magnesium alloy suitable for compression casting ultrathin wall member and preparation method |
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Patent Citations (3)
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| JPH08134581A (en) * | 1994-11-14 | 1996-05-28 | Mitsui Mining & Smelting Co Ltd | Production of magnesium alloy |
| CN1699612A (en) * | 2004-05-19 | 2005-11-23 | 中国科学院金属研究所 | High strength and high toughness cast magnesium alloy and preparing process thereof |
| CN101386946A (en) * | 2008-10-31 | 2009-03-18 | 中国科学院上海微系统与信息技术研究所 | Magnesium alloy suitable for compression casting ultrathin wall member and preparation method |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104651693A (en) * | 2013-11-22 | 2015-05-27 | 北京有色金属研究总院 | Microscale Al-containing rare earth wrought magnesium alloy and preparation method thereof |
| CN104651693B (en) * | 2013-11-22 | 2017-05-17 | 北京有色金属研究总院 | Microscale Al-containing rare earth wrought magnesium alloy and preparation method thereof |
| CN105568104A (en) * | 2016-01-15 | 2016-05-11 | 何枇林 | Rare earth strengthened magnesium alloy and preparation method thereof |
| CN107201470A (en) * | 2017-05-10 | 2017-09-26 | 上海大学 | A kind of magnesium alloy for having high heat dispersion, excellent mechanical performances concurrently and preparation method thereof |
| CN108715964A (en) * | 2018-06-07 | 2018-10-30 | 河南科技大学 | A kind of magnesium-rare earth and preparation method thereof |
| CN109295369A (en) * | 2018-11-23 | 2019-02-01 | 上海交通大学 | One kind magnesium alloy containing cerium mischmetal and its heat treatment method |
| CN111057924A (en) * | 2020-01-05 | 2020-04-24 | 北京工业大学 | High-plasticity low-rare earth magnesium alloy and preparation method thereof |
| CN111057924B (en) * | 2020-01-05 | 2021-07-02 | 北京工业大学 | High-plasticity low-rare earth magnesium alloy and preparation method thereof |
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