CN102994847B - Heatproof magnesium alloy - Google Patents

Heatproof magnesium alloy Download PDF

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Publication number
CN102994847B
CN102994847B CN201110266982.5A CN201110266982A CN102994847B CN 102994847 B CN102994847 B CN 102994847B CN 201110266982 A CN201110266982 A CN 201110266982A CN 102994847 B CN102994847 B CN 102994847B
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magnesium alloy
alloy
present
weight percent
rare earth
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CN102994847A (en
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冯俊
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Yangzhou Jinchen Stainless Steel Manufacture Co Ltd
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Jianghan University
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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

A kind of heat resistance magnesium alloy
Technical field
The present invention relates to a kind of magnesium alloy, the high performance heat resistant magnesium alloy of particularly a kind of applicable cast form.
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 cast magnesium alloys trade mark has ZM2, ZM3, ZM4, ZM6 etc.The alloy of these trades mark has: the feature that mechanical property, castability are all good, simultaneously, due to having concurrently containing the MgZr compound of a certain amount of higher melt or MgZr compound and MgRE compound in ZM series magnesium alloy β phase, this magnesium alloy is made to have certain resistance to elevated temperatures.As under normal temperature, ZM3 under as cast condition or as-heat-treated condition, its tensile strength R mfor 120MPa, elongation A is at 1.5%, 200 DEG C, its tensile strength R mfor 110MPa, elongation A is 2%; And for example ZM4, at normal temperatures, its tensile strength R mfor 140MPa, elongation A is at 2%, 200 DEG C, its tensile strength R mfor 110MPa, elongation A is 2.5%.
Realizing in process of the present invention, contriver finds that prior art at least exists following problem: along with development in science and technology, the Application Areas of magnesium alloy is more and more extensive, existing magnesium alloy cannot meet the requirement of operation under hot environment more than 200 DEG C, thus, the more excellent magnesium alloy of a kind of high thermal resistance is badly in need of.
Summary of the invention
In order to solve above-mentioned problems of the prior art, embodiments provide 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 made up of Mg, Zn, Zr, rare earth (RE), Nb and Al, its weight percent consists of Zn0.2%-9%, Zr0.1%-2%, rare earth 0.0002%-16%, Nb0.0002%-4%, Al0.001%-1.49%, all the other are Mg, and described Nb and Al is added in described magnesium alloy by the form of NbAl master alloy or AlNb master alloy.
Wherein, described rare earth is at least one in Gd, Y, Sc, Pr, Yb, Sm, Nd, La, Ce, Tb, Dy, Ho and Er.
Preferably, described rare earth is at least one in Gd or Gd and Y, Sc, Pr, Yb, Sm, Nd, La, Ce, Tb, Dy, Ho and Er.
Preferably, its weight percent consists of Zn0.2%-0.7%, Zr0.4%-1%, Gd0.1%-4%, Nb0.05%-1%, Al0.03%-0.6%, and all the other are Mg.
Preferably, its weight percent consists of Zn3.5%-5.5%, Zr0.4%-1%, Gd0.1%-4%, Nb0.05%-1%, Al0.03%-0.6%, and all the other are Mg.
Preferably, its weight percent consists of Zn7.5%-9%, Zr0.5%-1%, Gd0.1%-2.5%, Nb0.05%-1%, Al0.04%-0.6%, and all the other are Mg.
Most preferably, its weight percent consists of Zn0.6%, Zr0.8%, Gd2.2%, Nb0.2%, Al0.1%, and all the other are Mg.
The beneficial effect that the technical scheme that the embodiment of the present invention provides is brought is: in magnesium alloy 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, change the structure of β phase; Zr can crystal grain thinning strongly in addition, can also react and precipitate, purified aluminium alloy with some impurity element (as: Si) in aluminium alloy.The combined action of above-mentioned element, improves the resistance to elevated temperatures of magnesium alloy, obtains one and has excellent mechanical property, and machinability, mobility and die casting are good, and applicable casting is especially applicable to the heat resistance magnesium alloy of die casting.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below 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, add magnesium ingot, zinc ingot metal, MgZr master alloy, NbAl master alloy or AlNb master alloy 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.) 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 is argon gas; Magnesium alloy covering agent and master alloy product are market products, during preparation low-aluminum-content alloy, NbAl master alloy can choose the Al content product lower than Nb content, as: NbAl80 and NbAl75, their Al content is respectively 15%-20%, 20%-25%; 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 magnesium ingot, zinc ingot metal, MgZr master alloy, NbAl master alloy or AlNb 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 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 is argon gas; Magnesium alloy covering agent, rare earth and 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 the cast magnesium alloys (at least one as in ZM2, ZM3, ZM4, ZM6) of standard brand and 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.) 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 is argon gas; Magnesium alloy covering agent, master alloy 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 magnesium alloy that the embodiment of the present invention provides is not heat-treated, and other cast member can be heat-treated, general employing T4 solution treatment.The thermal treatment adopted in the embodiment of the present invention and T4 solid solution treatment process are: cast member is warming up to 420 DEG C in chamber type electric resistance furnace, are incubated 8 hours, cast member come out of the stove after shrend, water temperature 40 DEG C.
The impact of some other inevitable factor in the purity of raw material and melting, castingprocesses is selected by fusion process, the Mg alloy castings that the embodiment of the present invention provides can contain inevitable impurity, as Fe, Ni, 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 die cast, and the weight percent of described magnesium alloy consists of Zn0.2%, Zr0.1%, Y0.0002%, Nb0.0002%, Al0.001%, and all the other are Mg.
Foundry goods is heat-treated.
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 semi-solid casting, and the weight percent of described magnesium alloy consists of Zn2%, Zr1.5%, Sc8%, Nb3%, Al1%, and all the other are Mg.
Foundry goods is heat-treated.
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 one, foundry goods adopts Hpdc, and the weight percent of heat resistance magnesium alloy consists of Zn9%, Zr2%, Sm16%, Nb4%, Al1.49%, and all the other are Mg.
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 one, foundry goods adopts low-pressure casting, and the weight percent of described magnesium alloy consists of Zn0.2%, Zr0.4%, Nd0.1%, Nb0.05%, Al0.03%, and all the other are Mg.
Foundry goods is heat-treated.
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 precision casting, and the weight percent of described magnesium alloy consists of Zn0.7%, Zr1%, La4%, Nb1%, Al0.6%, and all the other are Mg.
Foundry goods is heat-treated.
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 one, foundry goods adopts sand mold casting, and the weight percent of described magnesium alloy consists of Zn0.5%, Zr0.5%, Gd2%, Nb0.5%, Al0.3%, and all the other are Mg.
Foundry goods is heat-treated.
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 two, foundry goods adopts Hpdc, and the weight percent of described magnesium alloy consists of Zn0.5%, Zr0.5%, Gd1%, Ce%, Nb0.5%, Al0.3%, and all the other are Mg.
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 Zn0.5%, Zr0.5%, Ce2%, Nb0.5%, Al0.3%, 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 Zn3.5%, Zr0.4%, Tb0.1%, Nb0.05%, Al0.03%, 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 Zn5.5%, Zr1%, Dy4%, Nb1%, Al0.6%, and all the other are Mg.
The performance of the Mg alloy castings that the present embodiment provides is see table 1.
Embodiment 11
Heat resistance magnesium alloy is prepared by step described in above-mentioned technique three, described standard brand diecast magnesium alloy used in preparation process is ZM2, foundry goods adopts Hpdc, the weight percent of described magnesium alloy consists of Zn4%, Zr0.7%, (Ce+La) 1.7%, Nb0.6%, Al0.2%, and all the other are Mg.
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 two, foundry goods adopts Hpdc, and the weight percent of described magnesium alloy consists of Zn4%, Zr0.7%, Gd3%, Nb0.6%, Al0.2%, and all the other are Mg.
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 Hpdc, and the weight percent of described magnesium alloy consists of Zn7.5%, Zr0.5%, Er0.1%, Nb0.05%, Al0.04%, and all the other are Mg.
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 Hpdc, and the weight percent of described magnesium alloy consists of Zn9%, Zr1%, Pr2.5%, Nb1%, Al0.6%, and all the other are Mg.
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 Hpdc, and the weight percent of described magnesium alloy consists of Zn8%, Zr0.8%, Yb1.5%, Nb0.7%, Al0.5%, and all the other are Mg.
The performance of the Mg alloy castings that the present embodiment provides is see table 1.
Embodiment 16
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 Zn0.6%, Zr0.8%, Gd2.2%, Nb0.2%, Al0.1%, and all the other are Mg.
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 Zn0.6%, Zr0.8%, Gd2.2%, Al0.1%, 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, single contaminant (as Fe, Ni, Cu etc.) as described in weight percent≤0.1% in magnesium alloy finished product.
The magnesium alloy that the embodiment of the present 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 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 180MPa, simultaneously see embodiment 16 and comparative example, the Mg alloy castings that the embodiment of the present invention provides, compared with not adding the Mg alloy castings of Nb, has better resistance toheat; By the contrast between embodiment 6-8 and embodiment 11,12, in the known RE contained, there is the effect of Gd better; The Mg alloy castings that embodiment 16 provides tensile strength under 200 DEG C 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 rolling deformation direction, rolling technology direction process routinely.
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 (7)

1. a heat resistance magnesium alloy, it is characterized in that, described magnesium alloy is made up of Mg, Zn, Zr, rare earth, Nb and Al, its weight percent consists of Zn0.2%-9%, Zr0.1%-2%, rare earth 0.0002%-16%, Nb0.0002%-4%, Al0.001%-1.49%, all the other are Mg, and described Nb and Al is added in described magnesium alloy by the form of NbAl master alloy or AlNb master alloy.
2. magnesium alloy according to claim 1, is characterized in that, described rare earth is at least one in Gd, Y, Sc, Pr, Yb, 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, Pr, Yb, 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 Zn0.2%-0.7%, Zr0.4%-1%, Gd0.1%-4%, Nb0.05%-1%, Al0.03%-0.6%, and all the other are Mg.
5. magnesium alloy according to claim 3, is characterized in that, its weight percent consists of Zn3.5%-5.5%, Zr0.4%-1%, Gd0.1%-4%, Nb0.05%-1%, Al0.03%-0.6%, and all the other are Mg.
6. magnesium alloy according to claim 3, is characterized in that, its weight percent consists of Zn7.5%-9%, Zr0.5%-1%, Gd0.1%-2.5%, Nb0.05%-1%, Al0.04%-0.6%, and all the other are Mg.
7. magnesium alloy according to claim 4, is characterized in that, its weight percent consists of Zn0.6%, Zr0.8%, Gd2.2%, Nb0.2%, Al0.1%, and all the other are Mg.
CN201110266982.5A 2011-09-09 2011-09-09 Heatproof magnesium alloy Expired - Fee Related CN102994847B (en)

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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
CN107201470B (en) * 2017-05-10 2019-07-23 上海大学 A kind of magnesium alloy and preparation method thereof having both high heat dispersion, excellent mechanical performances
CN108715964B (en) * 2018-06-07 2019-10-15 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
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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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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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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