CN104073702A - Rear-earth magnesium alloy and preparation method thereof - Google Patents
Rear-earth magnesium alloy and preparation method thereof Download PDFInfo
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Abstract
The invention discloses rear-earth magnesium alloy and a preparation method thereof, belongs to the technical field of metal materials solves a technical problem that AE44 preparation cost is high in the prior art, and further improves indoor-temperature mechanical performance, high-temperature mechanical performance and high-temperature creep performance of Mg-Al-RE alloys. The rear-earth magnesium alloy consists of the following components in percent by mass: 3.4-4.4% of Al, 2.5-4.0% of La, 0.1-1.2% of Sr, 0.2-0.4% of Mn, 0.01-0.2% of B, and the balance of magnesium. The invention further provides the preparation method of the rear-earth magnesium alloy. The rear-earth magnesium alloy has excellent high-temperature mechanical performance and high-temperature creep performance; under a condition at 200 DEG C, tensile strength is 110-120MPa, yield strength is 90-100MPa and ductility is 17-22%; under the 200 DEG C/85MPa condition, the creep deformation within 150 hours is 0.83%.
Description
Technical field
The present invention relates to a kind of magnesium-rare earth and preparation method thereof, belong to metallic substance technical field.
Background technology
Magnesium and magnesium alloys is the current minimum structural metallic materials of density in engineering application, simultaneously it also has easy recovery, high specific strength, high specific stiffness, high damping properties, good capability of electromagnetic shielding and the excellent advantage such as casting, machining property, has important using value and wide application prospect in fields such as automobile, 3C, aerospace and military project national defence.In industrial production, applying maximum magnesium alloy is cast magnesium alloys, especially pressure die casting magnesium alloy, comprises that AZ (Mg-Al-Zn) is, AM (Mg-Al-Mn) is, AS (Mg-Al-Si) is and AE (Mg-Al-RE) is etc.Wherein, to be diecast magnesium alloy obtain application to a certain extent at auto industry field because of its good die casting performance and higher room-temperature mechanical property for AZ system and AM, but its high-temperature behavior and creep property are poor, therefore its application is generally limited in temperature lower than the environment of 120 DEG C.But the working temperature of vehicle transmission part is generally all at 150-200 DEG C, therefore developing heat resistance magnesium alloy becomes the inexorable trend of magnesium alloy development.
DowMagnesium adds cerium-rich rare earth (RE) to form thermodynamically stable Al by being associated to Mg-Al in gold
11rE
3and Al
2rE phase, thus Mg suppressed
17al
12separate out, developed the AE42 diecast magnesium alloy with fine high-temperature behavior and creep property.But when temperature is during higher than 150 DEG C, in AE42 alloy, oversaturated aluminium can generate Mg with reactive magnesium
17al
12phase, thus cause its mechanical behavior under high temperature and creep-resistant property sharply to decline.2005, Hydro Mei Ye company of Norway has developed heat-proof compression casting magnesium alloy AE44 by increasing content of rare earth, its composition is that Mg-4Al%-4RE%-0.3Mn% is (in formula, RE represents cerium-rich rare earth, in cerium-rich rare earth, the mass percent of Ce is 55%, the quality percentage of La is 25%, the quality percentage of Nd is 15%, the quality percentage of Pr is 5%), with AE42 alloy phase ratio, AE44 is many 2% content of rare earth, utilizing the content of rare earth increasing to form more Al-RE second-phase increases the creep property of alloy.But because the rare earth such as Nd, Pr is in recent years widely used in Nd-Fe-Bo permanent magnet material, the price of Nd and Pr significantly goes up, and is La and Ce price tens times, separates from cerium-rich rare earth, this has just caused AE44 cost of alloy too high; Even and if the room-temperature mechanical property of AE44, mechanical behavior under high temperature and high temperature creep property all increase, but do not reach yet most desired effect.
Summary of the invention
In order to solve the high technical problem of AE44 preparation cost in prior art, further improve Mg-Al-RE and be associated golden room temperature mechanical property, mechanical behavior under high temperature and high temperature creep property, the invention provides a kind of magnesium-rare earth and preparation method thereof.
The composition of magnesium-rare earth of the present invention and mass percent are:
Al：3.4％-4.4％；
La：2.5％-4.0％；
Sr：0.1％-1.2％；
Mn：0.2％-0.4％；
B：0.01％-0.2％；
Surplus is magnesium.
Preferably, described composition and mass percent are:
Al：3.7％-4.0％；
La：3.0％-4.0％；
Sr：0.4％-0.8％；
Mn：0.3％-0.4％；
B：0.04％-0.07％；
Surplus is magnesium.
The preparation method of above-mentioned magnesium-rare earth, comprises the following steps:
(1) under the effect of protection gas, by magnesium, aluminium and the melting of magnesium manganese master alloy, obtain the first melt;
(2) under the effect of protection gas, after the first melt is heated up, in the first melt, add magnesium lanthanum master alloy, magnesium strontium master alloy and aluminium boron master alloy, after stirring, pass into argon gas, obtain the second melt;
(3) the second melt step (2) being obtained leaves standstill after cooling, and die casting, obtains magnesium-rare earth.
Preferably, in described step (1), the temperature of melting is 660-680 DEG C.
Preferably, in described step (2), the temperature of intensification is 730-740 DEG C.
Preferably, in described step (2), the speed of stirring is turn/min of 100-300, and the time of stirring is 5-10min.
Preferably, in described step (2), stir after 5-10min, leave standstill 15-20min at 730 DEG C of-740 DEG C of constant temperature, then pass into argon gas.
Preferably, in described step (2), the flow velocity that passes into nitrogen is 2-5L/min, and the time is 5-8min.
Preferably, in described step (3), the temperature of cooling is 700-720 DEG C.
Preferably, in described magnesium lanthanum master alloy, the mass percent of magnesium is 75-85%, and the mass percent of lanthanum is 15-25%; In magnesium strontium master alloy, the mass percent of magnesium is 75-85%, and the mass percent of strontium is 15-25%; In magnesium manganese master alloy, the mass percent of magnesium is 92-97%, and the mass percent of manganese is 3-8%; In aluminium boron master alloy, the mass percent of aluminium is 92-97%, and the mass percent of boron is 3-8%.
Compared with prior art, beneficial effect of the present invention:
(1) magnesium-rare earth of the present invention by lanthanum and strontium the aluminium in alloy be combined generate Al
11la
3phase and Al
4sr phase, has suppressed Mg
17al
12the generation of phase has utilized Al simultaneously
11la
3phase and Al
4the high high-temp stability of Sr phase, improved mechanical behavior under high temperature and the creep property of alloy, experimental result shows, magnesium-rare earth of the present invention at room temperature tensile strength is 240-250MPa, yield strength is 155-165MPa, unit elongation is 6-9%, and under the condition of 150 DEG C, tensile strength is 140-150MPa, and yield strength is 105-115MPa, unit elongation is 18-25%, under the condition of 200 DEG C, tensile strength is 110-120MPa, and yield strength is 90-100MPa, and unit elongation is 17-22%; Under 150 DEG C/85MPa condition, the creep strain of 250h is 0.30%, and under 200 DEG C/85MPa condition, the creep strain of 150h is 0.83%;
(2) magnesium-rare earth of the present invention is by strontium and boron, changed crystal grain pattern and form, reduced grain-size, play the effect of crystal grain thinning, make the more tiny of the second phase transformation in the microtexture of alloy, possess several different-shapes simultaneously, reduce alloy stress concentration at grain boundaries in deformation process, thereby be conducive to carry heavy alloyed intensity and plastic deformation ability, further improve the room-temperature mechanical property of alloy, experimental result shows, magnesium-rare earth average grain size of the present invention is 20-60 μ m;
(3) magnesium-rare earth of the present invention can be reacted formation compound and sink to furnace bottom with iron or other impurity elements in melt by manganese, boron, form with slag is removed, thereby detrimental impurity content in reduction alloy, carries heavy alloyed corrosion resistance;
(4) aluminium in magnesium-rare earth of the present invention makes this alloy have balanced intensity, plasticity and Production Practice of Casting Technologies, makes magnesium-rare earth of the present invention be applicable to industrial mass manufacture;
(5), in the preparation method's of magnesium-rare earth of the present invention process, appropriate rare earth element can refinery by de-gassing and is purified alloy melt, has also ensured the anti-oxidant and flame retardant effect of alloy in fusion process, has ensured the quality of alloy melting;
(6) in the preparation method's of magnesium-rare earth of the present invention process, by high-pressure casting moulding, make rare earth magnesium alloy material finer and close, crystal grain and second-phase are more, size is less, thereby have further improved mechanical behavior under high temperature and the creep property of alloy.
Brief description of the drawings
Fig. 1 is metallographic (OM) Photomicrograph of the magnesium-rare earth prepared of the embodiment of the present invention 3;
Fig. 2 is scanning electron microscope (SEM) back of the body electron scattering Photomicrograph of the magnesium-rare earth prepared of the embodiment of the present invention 3.
Embodiment
In order further to understand the present invention, below in conjunction with embodiment, the preferred embodiments of the invention are described, but should be appreciated that these are described is in order to further illustrate the features and advantages of the present invention instead of limiting to the claimed invention.
The composition of magnesium-rare earth of the present invention and mass percent are: the Al of 3.4%-4.4%, the La of 2.5%-4.0%, the Sr of 0.1%-1.2%, the Mn of 0.2%-0.4%, the B of 0.01%-0.2%, total amount is less than 0.02% Impurity Fe, Cu, Si and Ni (generally, inevitable impurity Fe, Cu, Si and Ni in fusion process), and surplus is Mg.
Magnesium-rare earth of the present invention at room temperature tensile strength is 240-250MPa, and yield strength is 155-165MPa, and unit elongation is 6-9%; Under the condition of 150 DEG C, tensile strength is 140-150MPa, and yield strength is 105-115MPa, and unit elongation is 18-25%; Under the condition of 200 DEG C, tensile strength is 110-120MPa, and yield strength is 90-100MPa, and unit elongation is 17-22%; And under 150 DEG C/85MPa condition, the creep strain of 250h is 0.30%; Under 200 DEG C/85MPa condition, the creep strain of 150h is 0.83%.The average grain size of magnesium-rare earth of the present invention is 20-60 μ m.
Room temperature of the present invention is known to the skilled person temperature, can be generally 20-25 DEG C.
The present invention is not particularly limited the source of Al in magnesium-rare earth, well known to a person skilled in the art Al source, the purity that the purity of Al is prepared the known employing of magnesium-rare earth with those skilled in the art is just passable, generally adopts fine aluminium, and purity is more than 99.5%.Al in magnesium-rare earth of the present invention makes alloy have balanced intensity, plasticity and Production Practice of Casting Technologies, is applicable to industrial mass manufacture.
The present invention is not particularly limited the source of Mg in magnesium-rare earth, well known to a person skilled in the art Mg source, the purity that the purity of Mg is prepared the known employing of magnesium-rare earth with those skilled in the art is just passable, generally adopts pure magnesium, and purity is more than 99.5%.
The present invention is not particularly limited the source of La in magnesium-rare earth, well known to a person skilled in the art rare earth element source or commercially available rare earth element, the purity of La is prepared the rare earth element purity of the known employing of magnesium-rare earth with those skilled in the art.
The present invention is all not particularly limited the source of Sr, Mn and B in magnesium-rare earth, and well known to a person skilled in the art source, it is just passable that purity is also prepared the purity of the known employing of magnesium-rare earth with those skilled in the art.
In the present invention, lanthanum and strontium can the aluminium in alloy be combined and be generated Al
11la
3phase and Al
4sr phase, thus Mg suppressed
17al
12the generation of phase, simultaneously Al
11la
3phase and Al
4sr is high-temperature thermal stability phase mutually, makes the alloy of preparation have excellent high-temperature heat-resistance performance and high temperature creep property.Compared with prior art, the second-phase that aluminium and lanthanum form is that fusing point and stability are all than cerium, neodymium, it is high that praseodymium is wanted, and solid solubility 0.4wt%La < 0.74wt%Ce < 1.7wt%Pr < 3.6wt%Nd in magnesium alloy, the solid solubility of element in alloy is larger, what dissolve is more, the content of rare earth that forms so second-phase part is just fewer, that is to say that Nd and Pr are fewer than the heat-resisting second-phase of the La formation of same equal size, creep property is also just relatively bad, so adopting Rare Earth Lanthanum to substitute cerium-rich rare earth, the present invention can reach Creep Properties maximization.
In the present invention, adding of strontium and boron, changed crystal grain pattern and form, reduced grain-size, play the effect of crystal grain thinning, strengthened intensity and the plasticity of alloy, and made the more tiny of the second phase transformation in the microtexture of alloy, there are several different patterns simultaneously, reduce the stress concentration at grain boundaries in alloy deformation process, thereby improved alloy strength and plastic deformation ability, further improved the room-temperature mechanical property of alloy.
In the present invention, manganese and boron can with melt in iron or other element reactions form compound sink to furnace bottom, remove with the form of slag, thereby reduce detrimental impurity content in alloy, carry heavy alloyed corrosion resistance.
The preparation method of magnesium-rare earth of the present invention, comprises the following steps:
(1) under protection gas effect, magnesium, aluminium and magnesium manganese master alloy are added in melting plant 660-680 DEG C of melting, obtain the first melt;
(2) under the effect of protection gas, the first melt is warming up to after 730-740 DEG C, in the first melt, add magnesium lanthanum master alloy, magnesium strontium master alloy and aluminium boron master alloy, maintain the temperature at 730-740 DEG C, stir after 5-10min with turn/min of 100-300,730-740 DEG C of constant temperature leaves standstill 15-20min, and then the argon gas refining 5-8min taking flow velocity as 2-5L/min, obtains the second melt;
Wherein, stirring can impel each alloying element to be uniformly distributed, if churning time is lower than 5-10min, easily there is segregation, if churning time higher than 5-10min, melt contacts and may bring oxide inclusion with air, as magnesium oxide etc., so the preferred 5-10min of churning time of the present invention;
(3) the second melt step (2) being obtained leaves standstill and is cooled to 700-720 DEG C, and temperature-fall period generally needs 35-40min, then carries out die casting, obtains magnesium-rare earth;
Wherein, be die cast as high-pressure casting as well known to those skilled in the art (highpressurediecasting), be called for short die casting, adopt die casting can make magnesium-rare earth of the present invention finer and close, pore is few, the various performances such as intensity, rigidity are higher, and in preparation method of the present invention, die casting can adopt carries out die casting on the cold-chamber die casting machine of 180-580 ton clamp force.
In preparation method of the present invention, the consumption of magnesium, aluminium, magnesium lanthanum master alloy, magnesium strontium master alloy, magnesium manganese master alloy and aluminium boron master alloy is according to composition and the mass percent proportioning of the magnesium-rare earth of required preparation, proportioning process is not particularly limited, according to those skilled in the art's known manner, generally do not consider loss.Wherein, a magnesium part in magnesium-rare earth derives from the magnesium directly adding, another part derives from magnesium lanthanum master alloy, magnesium strontium master alloy and magnesium manganese master alloy, and the aluminium part in magnesium-rare earth derives from the aluminium directly adding, and another part derives from aluminium boron master alloy.
In magnesium lanthanum master alloy of the present invention, the mass percent of magnesium is preferably 75-85%, and the mass percent of lanthanum is preferably 15-25%; Magnesium manganese master alloy, the mass percent of magnesium is preferably 92-97%, and the mass percent of manganese is preferably 3-8%; Magnesium strontium master alloy, the mass percent of magnesium is preferably 75-85%, and the mass percent of strontium is preferably 15-25%; ; In aluminium boron master alloy, the mass percent of aluminium is preferably 92-97%, and the mass percent of boron is preferably 3-8%.Magnesium lanthanum master alloy, magnesium strontium master alloy, magnesium manganese master alloy and aluminium boron master alloy are all known to the skilled person raw material, are purchased.
The present invention, before magnesium, aluminium, magnesium lanthanum master alloy, magnesium strontium master alloy, magnesium manganese master alloy and aluminium boron master alloy are added to melting plant melting, is preferably preheating to 200-300 DEG C.Melting plant of the present invention is not particularly limited, and generally adopts known magnesium alloy smelting crucible, and preferably, melting plant is preheated to 300 DEG C.
In preparation method of the present invention, in step (1) and step (2) protection gas be that volume ratio is the SF of 1:100
6: CO
2.
Further illustrate the present invention below in conjunction with embodiment and accompanying drawing.
Embodiment 1
The component of magnesium-rare earth and mass percent are: 3.4% aluminium, and 2.5% lanthanum, 0.1% strontium, 0.2% manganese, 0.01% boron, surplus is magnesium.
The preparation of above-mentioned magnesium-rare earth:
(1) as follows according to the component of above-mentioned magnesium-rare earth and mass percent proportioning: the mass percent of magnesium (purity 99.8%) is 79.59%, the mass percent of aluminium (purity 99.5%) is 3.21%, (magnesium accounts for 80% to magnesium lanthanum master alloy, lanthanum accounts for 20%) mass percent be 12.5%, (magnesium accounts for 80% to magnesium strontium master alloy, strontium accounts for 20%) mass percent be 0.5%, (magnesium accounts for 95% to magnesium manganese master alloy, manganese accounts for 5%) mass percent be 4%, (aluminium accounts for 95% to aluminium boron master alloy, boron accounts for 5%) mass percent be 0.2%,
(2) magnesium, aluminium, magnesium lanthanum master alloy, magnesium strontium master alloy, magnesium manganese master alloy and aluminium boron master alloy are preheating to 200-300 DEG C;
(3) preheated magnesium, aluminium and magnesium manganese master alloy are put into the crucible that is preheating to 300 DEG C, the SF that is 1:100 in volume ratio
6: CO
2protection under, be heated to 660-680 DEG C, after magnesium, aluminium and magnesium manganese master alloy are melted completely, obtain the first melt;
(4) under the protection of the SF6:CO2 that is 1:100 in volume ratio, the first melt temperature is elevated to 730-740 DEG C, add preheated magnesium lanthanum master alloy, magnesium strontium master alloy and aluminium boron master alloy, keep 730-740 DEG C, after stirring 5-10min with the speed of turn/min of 100-300,730-740 DEG C of insulation leaves standstill 15-20min, and then logical argon gas refining 5-8min, obtains the second melt;
(5) the second melt is left standstill and cools to 700-720 DEG C, on the cold-chamber die casting machine of 580 tons of clamp forces, carry out die casting, obtain magnesium-rare earth.
Under room temperature and high temperature, according to GB/T228.1-2010 metal material stretching test part 1: room temperature test method and the creep of GB/T2039-1997 metal stretching and rupture test method are carried out Elongation test and creep test to magnesium-rare earth respectively, and test result is in Table 2-table 7.
Embodiment 2
The component of magnesium-rare earth and mass percent are: 3.7% aluminium, and 3.0% lanthanum, 0.4% strontium, 0.3% manganese, 0.04% boron, surplus is magnesium.
The preparation of above-mentioned magnesium-rare earth:
(1) as follows according to the component of above-mentioned magnesium-rare earth and mass percent proportioning: the mass percent of magnesium (purity 99.8%) is 73.26%, the mass percent of aluminium (purity 99.5%) is 2.94%, (magnesium accounts for 80% to magnesium lanthanum master alloy, lanthanum accounts for 20%) mass percent be 15%, (magnesium accounts for 80% to magnesium strontium master alloy, strontium accounts for 20%) mass percent be 2%, (magnesium accounts for 95% to magnesium manganese master alloy, manganese accounts for 5%) mass percent be 6%, (aluminium accounts for 95% to aluminium boron master alloy, boron accounts for 5%) mass percent be 0.8%,
(2) magnesium, aluminium, magnesium lanthanum master alloy, magnesium strontium master alloy, magnesium manganese master alloy and aluminium boron master alloy are preheating to 200-300 DEG C;
(3) preheated magnesium, aluminium and magnesium manganese master alloy are put into the crucible that is preheating to 300 DEG C, the SF that is 1:100 in volume ratio
6: CO
2protection under, be heated to 660-680 DEG C, after magnesium, aluminium and magnesium manganese master alloy are melted completely, obtain the first melt;
(4) under the protection of the SF6:CO2 that is 1:100 in volume ratio, the first melt temperature is elevated to 730-740 DEG C, add preheated magnesium lanthanum master alloy, magnesium strontium master alloy and aluminium boron master alloy, keep 730-740 DEG C, after stirring 5-10min with the speed of turn/min of 100-300,730-740 DEG C of insulation leaves standstill 15-20min, and then logical argon gas refining 5-8min, obtains the second melt;
(5) the second melt is left standstill and cools to 700-720 DEG C, on the cold-chamber die casting machine of 580 tons of clamp forces, carry out die casting, obtain magnesium-rare earth.
Under room temperature and high temperature, according to GB/T228.1-2010 metal material stretching test part 1: room temperature test method and the creep of GB/T2039-1997 metal stretching and rupture test method are carried out Elongation test and creep test to magnesium-rare earth respectively, and test result is in Table 2-table 7.
Embodiment 3
The component of magnesium-rare earth and mass percent are: 4.0% aluminium, and 4.0% lanthanum, 0.8% strontium, 0.3% manganese, 0.07% boron, surplus is magnesium.
The preparation of above-mentioned magnesium-rare earth:
(1) as follows according to the component of above-mentioned magnesium-rare earth and mass percent proportioning: the mass percent of magnesium (purity 99.8%) is 65.93%, the mass percent of aluminium (purity 99.5%) is 2.67%, (magnesium accounts for 80% to magnesium lanthanum master alloy, lanthanum accounts for 20%) mass percent be 20%, (magnesium accounts for 80% to magnesium strontium master alloy, strontium accounts for 20%) mass percent be 4%, (magnesium accounts for 95% to magnesium manganese master alloy, manganese accounts for 5%) mass percent be 6%, (aluminium accounts for 95% to aluminium boron master alloy, boron accounts for 5%) mass percent be 1.4%,
(2) magnesium, aluminium, magnesium lanthanum master alloy, magnesium strontium master alloy, magnesium manganese master alloy and aluminium boron master alloy are preheating to 200-300 DEG C;
(3) preheated magnesium, aluminium and magnesium manganese master alloy are put into the crucible that is preheating to 300 DEG C, the SF that is 1:100 in volume ratio
6: CO
2protection under, be heated to 660-680 DEG C, after magnesium, aluminium and magnesium manganese master alloy are melted completely, obtain the first melt;
(4) SF that is 1:100 in volume ratio
6: CO
2protection under, the first melt temperature is elevated to 730-740 DEG C, add preheated magnesium lanthanum master alloy, magnesium strontium master alloy and aluminium boron master alloy, keep 730-740 DEG C, after stirring 5-10min with the speed of turn/min of 100-300,730-740 DEG C of insulation leaves standstill 15-20min, and then logical argon gas refining 5-8min, obtains the second melt;
(5) the second melt is left standstill and cools to 700-720 DEG C, on the cold-chamber die casting machine of 580 tons of clamp forces, carry out die casting, obtain magnesium-rare earth.
Fig. 1 is the Metallograph of the magnesium-rare earth prepared of the embodiment of the present invention 3, and as can be seen from Figure 1, magnesium-rare earth grain-size of the present invention is 20-60 μ m; Fig. 2 is the scanning electron microscope back of the body electron scattering Photomicrograph of the magnesium-rare earth prepared of the embodiment of the present invention 3, and as can be seen from Figure 2, magnesium-rare earth of the present invention exists Al
11la
3high-temperature thermal stability phase (white needles phase on crystal boundary), Al
4sr high-temperature thermal stability phase (being distributed on a small quantity crystal boundary and intracrystalline white massive phase), these two kinds of phase fusing points are very high, are respectively 1240 DEG C and 1040 DEG C, all higher than the netted Mg existing on crystal boundary in alloy
17al
12455 DEG C of the fusing points of phase, thus mechanical behavior under high temperature and the creep property of alloy improved.
The chemical composition of the magnesium-rare earth of the embodiment 3 measuring according to the mensuration inductively coupled plasma emission spectrography of GB/T20125-2006 low alloy steel multielement is as shown in table 1:
The composition of the magnesium-rare earth that table 1 is prepared for embodiment 3
| Alloy principal element wt% | Impurity element wt% |
| Al | La | Sr | Mn | B | Surplus | Fe | Si | Cu | Ni | Total amount |
| 3.98 | 3.85 | 0.74 | 0.28 | 0.068 | Mg | 0.005 | 0.01 | 0.001 | 0.0001 | ＜0.02 |
As can be seen from Table 1, embodiment 3 has really prepared component and mass percent is: 4.0% aluminium, 4.0% lanthanum, 0.8% strontium, 0.3% manganese, 0.07% boron, the magnesium-rare earth that surplus is magnesium.
Under room temperature and high temperature, according to GB/T228.1-2010 metal material stretching test part 1: room temperature test method and the creep of GB/T2039-1997 metal stretching and rupture test method are carried out Elongation test and creep test to magnesium-rare earth respectively, and test result is in Table 2-table 7.
Embodiment 4
The component of magnesium-rare earth and mass percent are: 4.4% aluminium, and 3.5% lanthanum, 1.2% strontium, 0.4% manganese, 0.2% boron, surplus is magnesium.
The preparation of above-mentioned magnesium-rare earth:
(1) as follows according to the component of above-mentioned magnesium-rare earth and mass percent proportioning: the mass percent of magnesium (purity 99.8%) is 63.90%, the mass percent of aluminium (purity 99.5%) is 0.6%, (magnesium accounts for 80% to magnesium lanthanum master alloy, lanthanum accounts for 20%) mass percent be 17.5%, (magnesium accounts for 80% to magnesium strontium master alloy, strontium accounts for 20%) mass percent be 6%, (magnesium accounts for 95% to magnesium manganese master alloy, manganese accounts for 5%) mass percent be 8%, (aluminium accounts for 95% to aluminium boron master alloy, boron accounts for 5%) mass percent be 4%,
(2) magnesium, aluminium, magnesium lanthanum master alloy, magnesium strontium master alloy, magnesium manganese master alloy and aluminium boron master alloy are preheating to 200-300 DEG C;
(3) preheated magnesium, aluminium and magnesium manganese master alloy are put into the crucible that is preheating to 300 DEG C, the SF that is 1:100 in volume ratio
6: CO
2protection under, be heated to 660-680 DEG C, after magnesium, aluminium and magnesium manganese master alloy are melted completely, obtain the first melt;
(4) SF that is 1:100 in volume ratio
6: CO
2protection under, the first melt temperature is elevated to 730-740 DEG C, add preheated magnesium lanthanum master alloy, magnesium strontium master alloy and aluminium boron master alloy, keep 730-740 DEG C, after stirring 5-10min with the speed of turn/min of 100-300,730-740 DEG C of insulation leaves standstill 15-20min, and then logical argon gas refining 5-8min, obtains the second melt;
(5) the second melt is left standstill and cools to 700-720 DEG C, on the cold-chamber die casting machine of 580 tons of clamp forces, carry out die casting, obtain magnesium-rare earth.
Under room temperature and high temperature, according to GB/T228.1-2010 metal material stretching test part 1: room temperature test method and the creep of GB/T2039-1997 metal stretching and rupture test method are carried out Elongation test and creep test to magnesium-rare earth respectively, and test result is in Table 2-table 7.
Table 2 is the magnesium-rare earth of the embodiment 1-4 mechanical property under room temperature (20 DEG C)
Table 3 is the magnesium-rare earth of the embodiment 1-4 mechanical property under high temperature (150 DEG C)
Table 4 is the magnesium-rare earth of the embodiment 1-4 mechanical property under high temperature (200 DEG C)
Table 5 is the magnesium-rare earth of the embodiment 1-4 mechanical property under high temperature (250 DEG C)
Table 6 is high temperature (150 DEG C) creep property of the magnesium-rare earth of embodiment 1-4
Table 7 is high temperature (200 DEG C) creep property of the magnesium-rare earth of embodiment 1-4
Can find out from table 2-table 7, magnesium-rare earth of the present invention has excellent room-temperature mechanical property, mechanical behavior under high temperature and high temperature creep property.
Obviously, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof.It should be pointed out that the those of ordinary skill for described technical field, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of the claims in the present invention.
Claims (10)
1. a magnesium-rare earth, is characterized in that, the composition of this magnesium-rare earth and mass percent are:
Al：3.4％-4.4％；
La：2.5％-4.0％；
Sr：0.1％-1.2％；
Mn：0.2％-0.4％；
B：0.01％-0.2％；
Surplus is magnesium.
2. a kind of magnesium-rare earth according to claim 1, is characterized in that, described composition and mass percent are:
Al：3.7％-4.0％；
La：3.0％-4.0％；
Sr：0.4％-0.8％；
Mn：0.3％-0.4％；
B：0.04％-0.07％；
Surplus is magnesium.
3. the preparation method of a kind of magnesium-rare earth described in claim 1 or 2, is characterized in that, comprises the following steps:
(1) under the effect of protection gas, by magnesium, aluminium and the melting of magnesium manganese master alloy, obtain the first melt;
(2) under the effect of protection gas, after the first melt is heated up, in the first melt, add magnesium lanthanum master alloy, magnesium strontium master alloy and aluminium boron master alloy, after stirring, pass into argon gas, obtain the second melt;
(3) the second melt step (2) being obtained leaves standstill after cooling, and die casting, obtains magnesium-rare earth.
4. the preparation method of a kind of magnesium-rare earth according to claim 3, is characterized in that, in described step (1), melt temperature is 660-680 DEG C.
5. the preparation method of a kind of magnesium-rare earth according to claim 3, is characterized in that, in described step (2), the temperature of intensification is 730-740 DEG C.
6. the preparation method of a kind of magnesium-rare earth according to claim 3, is characterized in that, in described step (2), the speed of stirring is turn/min of 100-300, and the time of stirring is 5-10min.
7. the preparation method of a kind of magnesium-rare earth according to claim 3, is characterized in that, in described step (2), after stirring, leaves standstill 15-20min, then pass into argon gas at 730-740 DEG C of constant temperature.
8. the preparation method of a kind of magnesium-rare earth according to claim 3, is characterized in that, in described step (2), the flow velocity that passes into nitrogen is 2-5L/min, and the time is 5-8min.
9. the preparation method of a kind of magnesium-rare earth according to claim 3, is characterized in that, in described step (3), the temperature of cooling is 700-720 DEG C.
10. the preparation method of a kind of magnesium-rare earth according to claim 3, is characterized in that, in described magnesium lanthanum master alloy, the mass percent of magnesium is 75-85%, and the mass percent of lanthanum is 15-25%; In magnesium strontium master alloy, the mass percent of magnesium is 75-85%, and the mass percent of strontium is 15-25%; In magnesium manganese master alloy, the mass percent of magnesium is 92-97%, and the mass percent of manganese is 3-8%; In aluminium boron master alloy, the mass percent of aluminium is 92-97%, and the mass percent of boron is 3-8%.
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| CN104550865A (en) * | 2015-01-16 | 2015-04-29 | 中国科学院青海盐湖研究所 | Magnesium aluminum strontium alloy preparation method |
| CN107604228A (en) * | 2017-08-30 | 2018-01-19 | 上海交通大学 | Corrosion-resistant diecast magnesium alloy of high heat conduction and preparation method thereof |
| CN107604228B (en) * | 2017-08-30 | 2019-09-27 | 上海交通大学 | Corrosion-resistant diecast magnesium alloy of high thermal conductivity and preparation method thereof |
| CN110195180A (en) * | 2018-02-26 | 2019-09-03 | 中国宝武钢铁集团有限公司 | A kind of high thermal conductivity diecast magnesium alloy and its manufacturing method |
| CN110195180B (en) * | 2018-02-26 | 2021-10-19 | 中国宝武钢铁集团有限公司 | High-thermal-conductivity die-casting magnesium alloy and manufacturing method thereof |
| CN110129644A (en) * | 2019-05-23 | 2019-08-16 | 山东省科学院新材料研究所 | Heat-resisting dissolvable magnesium alloy of one kind and its preparation method and application |
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| CN114783647A (en) * | 2022-05-20 | 2022-07-22 | 广东欣意电缆有限公司 | Carbon fiber rare earth magnesium alloy cable and preparation method thereof |
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