CN102994834B - Heatproof magnesium alloy containing Nb - Google Patents

Heatproof magnesium alloy containing Nb Download PDF

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CN102994834B
CN102994834B CN201110267000.4A CN201110267000A CN102994834B CN 102994834 B CN102994834 B CN 102994834B CN 201110267000 A CN201110267000 A CN 201110267000A CN 102994834 B CN102994834 B CN 102994834B
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magnesium alloy
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rare earth
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CN102994834A (en
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冯俊
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Haining Qianjiang Xingye Investment Development Co.,Ltd.
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Jianghan University
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Abstract

The invention discloses a heatproof magnesium alloy containing Nb, which belongs to the magnesium alloy field. The magnesium alloy is composed of Mg, Al, Si, Mn, rare earth, Nb and M, and comprises the following components by weight: 1.6-9.8% of Al, 0.5-2.5% of Si, 0.05-0.7% of Mn, 0.0001-10% of rare earth, 0.0002-4% of Nb, 0.0001-0.3% of M and the balance of Mg. M element is at least one selected in Ti, Sr, C and B. According to the invention, a rare earth element and an Nb element are added in the magnesium alloy, a structure of a beta phase is changed, thereby the high temperature resistance performance of the magnesium alloy is enhanced, the heatproof magnesium alloy containing Nb 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 containing Nb
Technical field
The present invention relates to a kind of magnesium alloy, particularly a kind of MgAlSi is the heat resistance magnesium alloy that is applicable to cast especially die casting.
Background technology
Along with scientific and technological development, the vehicles taking automobile as representative need to, by alleviating the weight of vehicle body, further be researched and developed the product innovation that fuel availability is higher.In automobile industry, magnesium alloy, as a kind of novel lightweight metal material, is used for substituting traditional cast iron by automaker, to realize the object that alleviates tare.
At present, domestic MgAlSi is that the diecast magnesium alloy trade mark has YM102, YM103, YM104, YM105, YM106; The MgAlSi of USS ASTM B is that the diecast magnesium alloy trade mark has AS21A, AS21B, AS41A, AS41B; The MgAlSi of Nippon Standard JIS H is that the diecast magnesium alloy trade mark has MDC6, MDC3B; The MgAlSi of European standard EN is that the diecast magnesium alloy trade mark has EN-MC21310, EN-MC21320.The alloy of these trades mark has mobility, feature that castability is good, and is widely used in the forging types such as die casting, low-pressure casting, permanent mold casting, precision casting, semi-solid casting, sand mold casting.Owing to containing more silicon addition, grain boundaries has part Mg 2si has replaced Mg mutually 17al 12the position of phase, with respect to AZ system and AM series magnesium alloy, its high-temperature behavior increases, and MgAlSi is that diecast magnesium alloy is suitable for 150 DEG C of following workplaces.
Realizing in process of the present invention, contriver finds that prior art at least exists following problem: because β in the alloy structure of above-mentioned MgAlSi series magnesium alloy is mutually still with Mg 17al 12be main, Mg 17al 12fusing point is lower, makes existing MgAlSi series magnesium alloy cannot adapt to 150 DEG C of above high temperature, thereby cannot be applied in 150 DEG C of above hot environments.
Summary of the invention
In order to solve above-mentioned problems of the prior art, the embodiment of the present invention provides a kind of heat resistance magnesium alloy containing Nb with good die casting.Described technical scheme is as follows:
A kind of heat resistance magnesium alloy containing Nb, described magnesium alloy is elementary composition by Mg, Al, Si, Mn, rare earth, Nb and M, its weight percent consists of Al1.6%-9.8%, Si0.5%-2.5%, Mn0.05%-0.7%, rare earth 0.001%-10%, Nb0.0002%-4%, M element 0.001%-0.3%, and all the other are Mg; Wherein, M element is at least one in Ti, Sr, C, B, and described Nb adds 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, Pr, Yb, La, Ce, Tb, Dy, Ho and Er.
Preferably, described rare earth is at least one in Gd or Gd and Y, Sc, Sm, Nd, Pr, Yb, La, Ce, Tb, Dy, Ho and Er.
Preferably, its weight percent consists of Al1.8%-2.5%, Si0.7%-1.2%, Mn0.05%-0.7%, Gd0.1%-4%, Nb0.05%-1%, M element 0.001%-0.3%, and all the other are Mg.
Preferably, its weight percent consists of Al3.5%-5%, Si0.5%-1.5%, Mn0.18%-0.7%, Gd0.1%-2%, Nb0.05%-1%, M element 0.001%-0.3%, and all the other are Mg.
More preferably, its weight percent consists of Al2.2%, Si1%, Mn0.2%, Gd0.5%, Nb0.2%, M element 0.2%, and all the other are Mg.
More preferably, its weight percent consists of Al4.6%, Si0.5%, Mn0.4%, Gd0.5%, Nb0.2%, M element 0.2%, 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 diecast 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, have substituted part Mg 17al 12β phase, has changed the structure of β phase; M element can crystal grain thinning in addition, delays growing up of crystal grain, carries heavy alloyed elongation, and elongation is the index of weighing metallic substance plasticity, refers to metallic substance under external force, produces tension set and unlikely ability of breaking.Under the combined action of above-mentioned element, improve the resistance to elevated temperatures of diecast magnesium alloy, obtain one and there is good mechanical property, machinability, mobility and die casting are good, and applicable casting is the heat resistance magnesium alloy of die casting especially.
Embodiment
For making the object, 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 present invention provides are described as follows:
1, the magnesium alloy that the embodiment of the present invention provides can be made by following three kinds of melting technologies:
Technique one: the magnesium alloy composition providing according to the embodiment of the present invention and cubage are also ready to the starting material of aequum, in resistance furnace, add magnesium ingot, aluminium ingot, AlSi master alloy, MgMn master alloy, AlNb master alloy or NbAl master alloy, in addition, also add at least one in AlTi master alloy, MgSr master alloy or AlSr master alloy, Graphite Powder 99, AlB master alloy.Heat up to resistance furnace used, in the time that the above-mentioned metal adding melts soon, adopt gas shield or magnesium alloy covering agent protection.While being warmed up to 720 DEG C-780 DEG C, add MgRE master alloy (as MgGd, MgY, MgNd etc.) or AlRE master alloy, and stir, leave standstill insulation 30 minutes at 720 DEG C-780 DEG C, 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 carry out refining treatment; If up-to-standard, described aluminium alloy temperature adjustment to 700 DEG C-740 DEG C is skimmed, then pour into a mould, 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 sale product; Refining treatment method adopts the ordinary method of the industry.
Technique two: the magnesium alloy composition providing according to the embodiment of the present invention and cubage are also ready to the starting material of aequum, in vacuum oven, add aluminium ingot, AlSi master alloy, AlMn master alloy or Mn agent, AlNb master alloy, in addition, also add at least one in AlTi master alloy, MgSr master alloy or AlSr master alloy, Graphite Powder 99, AlB master alloy.Be warming up to 820 DEG C, insulation 2-8 hour, then cools to 720 DEG C-780 DEG C, adds magnesium ingot and RE.After added melting of metal, 720 DEG C-780 DEG C insulations 30 minutes, obtain aluminium alloy, adopt gas shield or magnesium alloy covering agent protection to prevent aluminium alloy oxidation.Water a fritter sample with 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 DEG C-740 DEG C is skimmed, then pour into a mould, 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, RE, Mn agent and master alloy are sell goods on market; Refining treatment method adopts the ordinary method of the industry.
Technique three: magnesium alloy composition and the cubage providing according to the embodiment of the present invention the starting material that are ready to aequum, in smelting furnace, adding standard brand MgAlSi is diecast magnesium alloy, AlNb master alloy, in addition, also add at least one in AlTi master alloy, MgSr master alloy or AlSr master alloy, Graphite Powder 99, AlB master alloy.Above-mentioned metal adopts gas shield or magnesium alloy covering agent protection while fusing soon.While being warmed up to 720 DEG C-780 DEG C, add MgRE master alloy (as MgGd, MgY, MgNd etc.) or AlRE master alloy, and stir, leave standstill insulation 30 minutes at 720 DEG C-780 DEG C, 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 carry out refining treatment; If up-to-standard, described aluminium alloy temperature adjustment to 700 DEG C-740 DEG C is skimmed, then pour into a mould, obtain the foundry goods of alloy of the present invention.
In this technique, shielding gas is argon gas; Magnesium alloy covering agent and master alloy are sell goods on market; Refining treatment method adopts the ordinary method of the industry.
Thermal treatment and the treatment process thereof of the magnesium alloy that 2, the embodiment of the present invention provides:
Die casting in the magnesium alloy that the embodiment of the present invention provides can not heat-treated, and the cast member of other form can be heat-treated, and generally adopts T4 solution treatment.The embodiment of the present invention adopt thermal treatment be that T4 solid solution treatment process is: cast member is warming up in chamber type electric resistance furnace to 440 DEG C, is incubated 10 hours, cast member come out of the stove after shrend, 40 DEG C of water temperatures.
Be subject to fusion process to select the impact of some other inevitable factor in the purity of raw material and melting, castingprocesses, the Mg alloy castings that the embodiment of the present invention provides can contain inevitable impurity, as Zn, Fe, 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, just can 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 Al1.6%, Si0.5%, Mn0.05%, Y0.001%, Nb0.0002%, Ti0.001%, and all the other are Mg.
Foundry goods is heat-treated.
The performance of the Mg alloy castings that the present embodiment provides is referring to 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 Al9.8%, Si2.5%, Mn0.7%, Sm10%, Nb4%, Sr0.3%, and all the other are Mg.
Foundry goods is heat-treated.
The performance of the Mg alloy castings that the present embodiment provides is referring to table 1.
Embodiment 3
Prepare heat resistance magnesium alloy by step described in above-mentioned technique two, foundry goods adopts Hpdc, and the weight percent of heat resistance magnesium alloy consists of Al4%, Si0.6%, Mn0.06%, Nd9%, Nb3%, C0.3%, and all the other are Mg.
The performance of the Mg alloy castings that the present embodiment provides is referring to 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 Al1.8%, Si0.7%, Mn0.05%, La0.1%, Nb0.05%, B0.001%, and all the other are Mg.
Foundry goods is heat-treated.The performance of the Mg alloy castings that the present embodiment provides is referring to table 1.
Embodiment 5
Prepare heat resistance magnesium alloy by step described in above-mentioned technique three, the described standard brand diecast magnesium alloy using in preparation process is YM103, foundry goods adopts precision casting, the weight percent of described magnesium alloy consists of Al2.5%, Si1.2%, Mn0.1%, Ce4%, Nb1%, C0.1%, and all the other are Mg.
Foundry goods is heat-treated.The performance of the Mg alloy castings that the present embodiment provides is referring to 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 Al2.2%, Si1%, Mn0.2%, Gd0.5%, Nb0.2%, Ti0.2%, and all the other are Mg.Foundry goods is heat-treated.
The performance of the Mg alloy castings that the present embodiment provides is referring to 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 Al2.2%, Si1%, Mn0.2%, Gd0.3%, Tb0.2%, Nb0.2%, Ti0.2%, and all the other are Mg.
The performance of the Mg alloy castings that the present embodiment provides is referring to 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 Al2.2%, Si1%, Mn0.2%, Tb0.5%, Nb0.2%, Ti0.2%, and all the other are Mg.
The performance of the Mg alloy castings that the present embodiment provides is referring to 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 Al3.5%, Si0.5%, Mn0.18%, Dy0.1%, Nb0.05%, B0.001%, and all the other are Mg.
The performance of the magnesium alloy that the present embodiment provides is referring to 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 Al5%, Si1.5%, Mn0.7%, Ho2%, Nb1%, Sr0.3%, and all the other are Mg.
The performance of the Mg alloy castings that the present embodiment provides is referring to table 1.
Embodiment 11
Prepare heat resistance magnesium alloy by step described in above-mentioned technique one, foundry goods adopts Hpdc, and the weight percent of described magnesium alloy consists of Al4%, Si1%, Mn0.5%, Er1%, Nb0.5%, C0.01%, and all the other are Mg.
The performance of the Mg alloy castings that the present embodiment provides is referring to 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 Al4.6%, Si0.5%, Mn0.4%, Gd0.5%, Nb0.2%, Ti0.2%, and all the other are Mg.
The performance of the Mg alloy castings that the present embodiment provides is referring to 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 Al4.6%, Si0.5%, Mn0.4%, Gd0.3%, Sc0.2%, Nb0.2%, Ti0.2%, and all the other are Mg.
The performance of the Mg alloy castings that the present embodiment provides is referring to 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 Al4.6%, Si0.5%, Mn0.4%, Sc0.5%, Nb0.2%, Ti0.2%, and all the other are Mg.
The performance of the Mg alloy castings that the present embodiment provides is referring to 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 Al4.6%, Si0.5%, Mn0.4%, Gd0.5%, Ti0.2%, and all the other are Mg and inevitable impurity.
The performance of the Mg alloy castings that the present embodiment provides is referring to table 1.
The Mg alloy castings that each embodiment provides above all contains inevitable impurity, 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 same with AS21A, AS41A, magnesium alloy provided by the invention 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 referring to table 1.
The mechanical property parameters table of the Mg alloy castings that the 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, be diecast magnesium alloy higher than existing MgAlSi far away, there is good resistance toheat, simultaneously referring to embodiment 12 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 12-14, in the known RE containing, there is the effect of Gd better; The Mg alloy castings that embodiment 6 and 12 provides tensile strength under 200 DEG C of high temperature is the highest, and the Mg alloy castings thermotolerance that embodiment 6 and 12 provides is the strongest.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (7)

1. the heat resistance magnesium alloy containing Nb, it is characterized in that, described magnesium alloy is elementary composition by Mg, Al, Si, Mn, rare earth, Nb and M, its weight percent consists of Al1.6%-9.8%, Si0.5%-2.5%, Mn0.05%-0.7%, rare earth 0.001%-10%, Nb0.0002%-4%, M element 0.001%-0.3%, and all the other are Mg; Wherein, M element is at least one in Ti, Sr, C, B, and described Nb adds 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, Pr, Yb, 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, Pr, Yb, Nd, La, Ce, Tb, Dy, Ho and Er.
4. magnesium alloy according to claim 1, is characterized in that, its weight percent consists of Al1.8%-2.5%, Si0.7%-1.2%, Mn0.05%-0.7%, Gd0.1%-4%, Nb0.05%-1%, M element 0.001%-0.3%, and all the other are Mg.
5. magnesium alloy according to claim 1, is characterized in that, its weight percent consists of Al3.5%-5%, Si0.5%-1.5%, Mn0.18%-0.7%, Gd0.1%-2%, Nb0.05%-1%, M element 0.001%-0.3%, and all the other are Mg.
6. magnesium alloy according to claim 4, is characterized in that, its weight percent consists of Al2.2%, Si1%, Mn0.2%, Gd0.5%, Nb0.2%, M element 0.2%, and all the other are Mg.
7. magnesium alloy according to claim 5, is characterized in that, its weight percent consists of Al4.6%, Si0.5%, Mn0.4%, Gd0.5%, Nb0.2%, M element 0.2%, and all the other are Mg.
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