CN109161764A - A kind of magnesium alloy materials and preparation method thereof that high-strength plasticity high alloy content squeezes - Google Patents
A kind of magnesium alloy materials and preparation method thereof that high-strength plasticity high alloy content squeezes Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C23/00—Alloys based on magnesium
- C22C23/02—Alloys based on magnesium with aluminium as the next major constituent
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
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Abstract
The invention discloses the magnesium alloy materials that a kind of high-strength plasticity high alloy content squeezes, it include: that the magnesium alloy materials that squeeze of the high-strength plasticity high alloy content are grouped as by following weight fraction group: Al:5.8-6.2%, Zn:4-4.6%, Sn:0.99-4.0%, surplus Mg.The defect that existing alloy material is at high cost using rare earth element can be overcome, by addition metallic tin and adjusting is made to its content, enabling magnesium alloy simultaneously has high-intensitive and high-ductility, and alloy content is high, and thermal stability is good.The present invention also provides a kind of preparation methods for the magnesium alloy materials that high-strength plasticity high alloy content squeezes, without using rare earth element, tin element is added, and adjusting is made to its content, oxidization burning loss is utmostly reduced by low smelting heat, improves the intensity and plasticity of magnesium alloy.
Description
Technical field
The present invention relates to the magnesium alloy materials and preparation method thereof that a kind of high-strength plasticity high alloy content squeezes, and belong to material
Preparation technical field.
Background technique
Magnesium alloy as most light engineering structure metal material, have that specific strength is high, specific stiffness is high, electrical and thermal conductivity is good and
The advantages that good recycling, the fields lightweight such as automobile, aviation, communication, in terms of obtain it is increasingly extensive
Application.The wrought magnesium alloy obtained especially by the methods of extruding has tissue finer and close compared with cast magnesium alloy,
The advantages that intensity and higher ductility, can satisfy the demand of multiplicity part.But common wrought magnesium alloy is typically due to it
Alloy content is lower, lacks hardening constituent, is difficult to obtain high intensity during conventional extrusion, and the magnesium alloy of high alloy content,
Due to containing a large amount of low melting points and coarse the second phase of size, it is easy to cause stress to be concentrically formed crackle in extrusion process,
Keep its machine-shaping property poor therefore used frequently as cast alloy, limits the application range of wrought magnesium alloy.Currently, most
The common method for improving magnesium alloy mechanical property is to add suitable alloying element in magnesium alloy, then cooperate at deformation appropriate
Reason obtains the excellent magnesium alloy materials of comprehensive mechanical property, but can improve the technical staff for obtaining wrought magnesium alloy intensity and plasticity simultaneously
Skill is actually rare.In addition, addition rare earth element can effectively improve alloy mechanical property, but rare earth element is expensive, no
It is used conducive to a wide range of.
Earlier application " a kind of high plastic magnesium alloy and preparation method thereof " China Patent Publication No.: lead in CN104975214A
The rare earth element y that addition is more than 5% is crossed, prepares the sheet alloy that highest elongation percentage is 29.1% after squeezing, but its room temperature is anti-
Tensile strength is only 231MPa, and production cost is higher.Earlier application " a kind of wrought magnesium alloy and preparation method thereof ", China is specially
Sharp publication number: CN108070762A uses traditional extrusion process, and traditional wrought magnesium alloy formula is improved, is improved
It is smaller on the influence of the plasticity and toughness of wrought magnesium alloy while alloy strength, but its room temperature tensile intensity is only up to 315MPa, most
High-elongation is only 17.3%.Though obtaining the performance of wrought magnesium alloy centainly in patent described above by adjusting alloying component
The promotion of degree, but intensity and plasticity generally can not guarantee to be promoted simultaneously, and the degree promoted is unobvious.Therefore, research invention
It is novel, simple production process, have commercial application value and have high-strength and high-plasticity wrought magnesium alloy have it is important
Realistic meaning.
Summary of the invention
The present invention has designed and developed a kind of magnesium alloy materials that high-strength plasticity high alloy content squeezes, and can overcome existing conjunction
Golden materials'use rare earth element defect at high cost by addition metallic tin and makes adjusting to its content, enables magnesium alloy
There is high-intensitive and high-ductility simultaneously, alloy content is high, and thermal stability is good.
The present invention has also designed and developed a kind of preparation method of magnesium alloy materials that high-strength plasticity high alloy content squeezes, no
Using rare earth element, tin element is added, and adjusting is made to its content, oxidization burning loss is reduced by low smelting heat, improves magnesium and closes
The intensity and plasticity of gold.
Technical solution provided by the invention are as follows:
A kind of magnesium alloy materials that high-strength plasticity high alloy content squeezes, comprising:
The magnesium alloy materials that the high-strength plasticity high alloy content squeezes are grouped as by following weight fraction group: Al:5.8-
6.2%, Zn:4-4.6%, Sn:0-4%, surplus Mg.
A kind of preparation method for the magnesium alloy materials that high-strength plasticity high alloy content squeezes, includes the following steps:
Magnesium ingot is put into melting furnace and is heated and kept the temperature by step 1, and progress is warming up to magnesium ingot for the first time and melts completely
Afterwards, remaining ingredient is added: Al, Zn and Sn carry out blowing afloat stirring and slagging-off after alloy melts completely, heat up by second
It casts with after heat preservation, obtains magnesium alloy ingot；
Step 2, by the obtained magnesium alloy ingot as in heat-treatment furnace, heat and keep the temperature under protection gas effect,
Solid solution the second phase of diffusion, obtains the magnesium alloy ingot of solution treatment；
Step 3, hot extrusion carry out hot extrusion, obtain after extruding after the magnesium alloy ingot pre-heating temperature elevation of solution treatment
Magnesium alloy plate.
Preferably, the magnesium alloy materials that the high-strength plasticity high alloy content squeezes are grouped by following weight fraction group
At: Al:6.1%, Zn:4.5%, Sn:3.0%, surplus Mg.
Preferably, the heating temperature of magnesium ingot is 500 DEG C in the step 1, and first time warming temperature is 660-700 DEG C,
Second of warming temperature is 680-700 DEG C.
Preferably, the gaseous mixture that the protection gas in the step 2 is SF6 and CO2.
Preferably, SF in the protection gas6: CO2Volume ratio is 1:99.
Preferably, extrusion temperature is 380-410 DEG C in step 3.
Preferably, extrusion ratio is 35:1, extruding rate 51s/m in the hot extrusion process.
Preferably, the sectional dimension of the magnesium alloy plate are as follows: 5mm × 40mm.
Preferably, soaking time is 10-40 minutes in the step 1.
It is of the present invention the utility model has the advantages that
1, magnesium alloy materials provided by the invention have good Castability, and Magnesium Alloy crystal grain after extruding first
Tiny (less than 4 microns), are uniform-distribution with a large amount of nanometers, the second phase of submicron order, refined crystalline strengthening, and second-phase strength effect is shown
It writes, work hardening index is high, makes the magnesium alloy materials while having high-intensitive, high-ductility and high-temperature stability.
2, the extrusion forming for being provided simultaneously with the high alloy content magnesium alloy materials of high-intensitive and high-ductility is realized.
3, excellent mechanical property: the crystallite dimension of alloy structure is tiny, and a large amount of the second phases of submicron order of Dispersed precipitate make
Obtain alloy has high-intensitive (366MPa) and high-ductility (20%) simultaneously at room temperature, has high-temperature stability under the conditions of 100 DEG C
(tensile strength 312MPa).
4, simple preparation method: using low smelting heat, rise to high temperature refinery and scarfing cinder in casting and fusion process, maximum
Degree reduces oxidization burning loss.Hot extrusion process eliminates cumbersome processing flow using a traditional extrusion process, has preparation
Simply, the features such as being reliable, easy to popularization and strong usability.
5, replace rare earth element with Sn element, there is advantage in cost, it can be in a wide range of interior progress promotion and application.
Detailed description of the invention
Fig. 1 is the scanning electron microscope (SEM) photograph of the polynary high alloy content magnesium alloy of 1 As-extruded of embodiment.
Fig. 2 is the scanning electron microscope (SEM) photograph of the polynary high alloy content magnesium alloy of 2 As-extruded of embodiment.
Fig. 3 is the scanning electron microscope (SEM) photograph of the polynary high alloy content magnesium alloy of 3 As-extruded of embodiment.
Fig. 4 is the scanning electron microscope (SEM) photograph of the polynary high alloy content magnesium alloy of 4 As-extruded of embodiment.
Fig. 5 is the scanning electron microscope (SEM) photograph of the polynary high alloy content magnesium alloy of 1 As-extruded of comparative example.
Fig. 6 is the scanning electron microscope (SEM) photograph of the polynary high alloy content magnesium alloy of 2 As-extruded of comparative example.
Fig. 7 is the scanning electron microscope (SEM) photograph of the polynary high alloy content magnesium alloy of 3 As-extruded of comparative example.
Fig. 8 is the scanning electron microscope (SEM) photograph of the polynary high alloy content magnesium alloy of 4 As-extruded of comparative example.
Specific embodiment
Present invention will be described in further detail below with reference to the accompanying drawings, to enable those skilled in the art referring to specification text
Word can be implemented accordingly.
The present invention provides a kind of magnesium alloy materials that high-strength plasticity high alloy content squeezes, wherein high-strength plasticity high alloy
The magnesium alloy materials that content squeezes are grouped as by following weight fraction group: Al:5.8-6.2%, Zn:4-4.6%, Sn:0-4%,
Surplus is Mg, Sn element is added in component, and adjust its content, makes magnesium alloy while having high-intensitive and high speed, alloy
Content is high, and overcomes the problems, such as that existing magnesium alloy is at high cost using rare earth element.
The present invention also provides a kind of preparation method for the magnesium alloy materials that high-strength plasticity high alloy content squeezes, the preparation sides
Method includes melting and three casting, solution treatment and hot extrusion steps；Prepared Magnesium Alloy is micro- less than 4 by average-size
The second phase composition of submicron order of the matrix grain and a large amount of Dispersed precipitates of rice；The magnesium alloy room temperature tensile of this method preparation has
High-strength tenacity, 100 DEG C stretch with good thermal stability, the specific steps are as follows:
Step 1, melting and casting: weighing Al:5.8-6.2%, Zn:4-4.6%, Sn:0-4% according to parts by weight, remaining
Amount is Mg；Magnesium ingot is put into first in the smelting furnace for be connected with mixed gas and is heated to 500 DEG C and keeps the temperature 2-3 hours；Wherein, it mixes
Gas is SF6+CO2Mixed gas, volume ratio 1:99；Carry out again for the first time heat up by temperature rise to 660-700 DEG C it is complete to magnesium ingot
Running down；Then pure Al, Zn and Sn after preheating is added；It blown, stirred and is removed the gred after alloy is completely melt；It is most laggard
Temperature is risen to 680-700 DEG C by second of heating of row, and heat preservation completed fusion process after 10-40 minutes；Alloy molten solution is cast to
In grinding tool, then cooling obtains magnesium alloy ingot in air；
Step 2, solid solution: magnesium alloy ingot obtained in step 1 is placed in heat-treatment furnace, is added under protective gas protection
Heat to 410 DEG C heat preservation 1-3 hours, solid solution diffusion the second phase, obtain the magnesium alloy ingot of solution treatment；
Step 3, hot extrusion: by the step 2 obtained magnesium alloy ingot of processing 300 DEG C preheating 1-3 hours, be continuously heating to
390 DEG C preheating 1-3 hours, then carry out hot extrusion；Squeezing temperature is 380-410 DEG C, extrusion ratio 35:1, and extruding rate is
51s/m, plate after extruding are air-cooled to room temperature, and the transversal dimensions of plate are 5mm × 40mm.
Embodiment 1
Step 1, melting and casting: Al:5.8%, Zn:4%, Sn:0.99%, surplus Mg are weighed according to parts by weight；
Magnesium ingot is put into first in the smelting furnace for be connected with mixed gas and is heated to 500 DEG C and keeps the temperature 2 hours, wherein mixed gas SF6
+CO2Gaseous mixture, SF6And CO2Volume ratio is 1:99；It carries out heating up for the first time again and temperature is risen to 660 DEG C is completely melt to magnesium ingot；
Then pure Al, Zn and Sn after preheating is added；It blown, stirred and is removed the gred after alloy is completely melt；Finally carry out second
Temperature is risen to 680 DEG C by secondary heating, and fusion process is completed in heat preservation after ten minutes；Alloy molten solution is cast in grinding tool, is then existed
Cooling obtains magnesium alloy ingot in air；
Step 2, solid solution: magnesium alloy ingot obtained in step 1 is placed in heat-treatment furnace, is heated under protection of argon gas
410 DEG C keep the temperature 1 hour, and solid solution the second phase of diffusion obtains the magnesium alloy ingot of solution treatment；
Step 3, hot extrusion: the magnesium alloy ingot that step 2 processing obtains is preheated 1 hour at 300 DEG C, is continuously heating to
390 DEG C preheat 1 hour, then carry out hot extrusion；Squeezing temperature is 380 DEG C, extrusion ratio 35:1, extruding rate 51s/m, is squeezed
Plate after pressure is air-cooled to room temperature, and the transversal dimensions of plate are 5mm × 40mm.
As shown in Figure 1, its room temperature tensile mechanical property of high alloy content extrusion magnesium alloy obtained in the present embodiment are as follows:
At room temperature, tensile strength 328MPa, yield strength 171MPa, elongation at break 16.3%；At 100 DEG C, tensile strength
305MPa, yield strength 170MPa, elongation at break 28.7%；As shown in table 1, in the present embodiment magnesium alloy mechanical property
The mechanical property that the magnesium alloy of rare earth element is added in the magnesium alloy and comparative example 3 of Sn element can be not added with comparative example 1 and 2
It compares, is significantly improved, elongation percentage improves most obvious.
Embodiment 2
Step 1, melting and casting: weighing Al:5.98%, Zn:4.27%, Sn:1.90% according to parts by weight, and surplus is
Mg；Magnesium ingot is put into first in the smelting furnace for be connected with mixed gas and is heated to 500 DEG C and keeps the temperature 2.5 hours；Wherein, mixed gas
For SF6+CO2Gaseous mixture, SF6And CO2Volume ratio is 1:99；Carry out again for the first time heat up by temperature rise to 675 DEG C it is complete to magnesium ingot
Fusing；Then pure Al, Zn and Sn after preheating is added；It blown, stirred and is removed the gred after alloy is completely melt；Finally carry out
Temperature is risen to 690 DEG C by second of heating, and fusion process is completed in heat preservation after ten minutes；Alloy molten solution is cast in grinding tool, with
Cooling obtains magnesium alloy ingot in air afterwards；
Step 2, solid solution: magnesium alloy ingot obtained in step 1 is placed in heat-treatment furnace, is added under protective gas protection
Heat to 410 DEG C keep the temperature 1.5 hours, solid solution diffusion the second phase, obtain the magnesium alloy ingot of solution treatment；
Step 3, hot extrusion: the magnesium alloy ingot that step 2 processing obtains is preheated 1.5 hours at 300 DEG C, is continuously heating to
390 DEG C preheat 1.5 hours, then carry out hot extrusion；Squeezing temperature is 385 DEG C, extrusion ratio 35:1, extruding rate 51s/m,
Plate after extruding is air-cooled to room temperature, and the transversal dimensions of plate are 5mm × 40mm.
As shown in Fig. 2, its room temperature tensile mechanical property of high alloy content extrusion magnesium alloy obtained in the present embodiment are as follows:
At room temperature, tensile strength 349MPa, yield strength 197MPa, elongation at break 17.9%；At 100 DEG C, tensile strength
309MPa, yield strength 171MPa, elongation at break 33.1%, as shown in table 1, the mechanical property of magnesium alloy in the present embodiment
The mechanical property that the magnesium alloy of rare earth element is added in the magnesium alloy and comparative example 3 of Sn element can be not added with comparative example 1 and 2
It compares, is significantly improved, elongation percentage improves most obvious.
Embodiment 3
Step 1, melting and casting: Al:6.1%, Zn:4.5%, Sn:3.0%, surplus Mg are weighed according to parts by weight；
Magnesium ingot is put into first in the smelting furnace for be connected with mixed gas and is heated to 500 DEG C and keeps the temperature 2.8 hours；Wherein, mixed gas is
SF6+CO2Gaseous mixture, SF6And CO2Volume ratio is 1:99；Carry out heating up for the first time again by temperature rise to 685 DEG C it is completely molten to magnesium ingot
Change；Then pure Al, Zn and Sn after preheating is added；It blown, stirred and is removed the gred after alloy is completely melt；Finally carry out
Temperature is risen to 695 DEG C by secondary temperature elevation, and fusion process is completed in heat preservation after ten minutes；Alloy molten solution is cast in grinding tool, then
Cooling obtains magnesium alloy ingot in air；
Step 2, solid solution: magnesium alloy ingot obtained in step 1 is placed in heat-treatment furnace, is added under protective gas protection
Heat to 410 DEG C keep the temperature 2.5 hours, solid solution diffusion the second phase, obtain the magnesium alloy ingot of solution treatment；
Step 3, hot extrusion: the magnesium alloy ingot that step 2 processing obtains is preheated 2.5 hours at 300 DEG C, is continuously heating to
390 DEG C preheat 2.5 hours, then carry out hot extrusion；Squeezing temperature is 395 DEG C, extrusion ratio 35:1, extruding rate 50s/m,
Plate after extruding is air-cooled to room temperature, and the transversal dimensions of plate are 5mm × 40mm.
As shown in figure 3, its room temperature tensile mechanical property of high alloy content extrusion magnesium alloy obtained in the present embodiment are as follows:
At room temperature, tensile strength 366MPa, yield strength 207MPa, elongation at break 20.3%；At 100 DEG C, tensile strength
312MPa, yield strength 188MPa, elongation at break 35.2%, as shown in table 1, the mechanical property of magnesium alloy in the present embodiment
The mechanical property that the magnesium alloy of rare earth element is added in the magnesium alloy and comparative example 3 of Sn element can be not added with comparative example 1 and 2
It compares, is significantly improved, elongation percentage improves most obvious.
Embodiment 4
Step 1, melting and casting: Al:6.2%, Zn:4.6%, Sn:4%, surplus Mg are weighed according to parts by weight；It is first
First magnesium ingot is put into the smelting furnace for be connected with mixed gas and is heated to 500 DEG C and keeps the temperature 3 hours；Wherein, mixed gas SF6+
CO2Gaseous mixture, SF6And CO2Volume ratio is 1:99；It carries out heating up for the first time again and temperature is risen to 700 DEG C is completely melt to magnesium ingot；
Then pure Al, Zn and Sn after preheating is added；It blown, stirred and is removed the gred after alloy is completely melt；Finally carry out second
Temperature is risen to 700 DEG C by secondary heating, and fusion process is completed in heat preservation after forty minutes；Alloy molten solution is cast in grinding tool, is then existed
Cooling obtains magnesium alloy ingot in air；
Step 2, solid solution: magnesium alloy ingot obtained in step 1 is placed in heat-treatment furnace, is added under protective gas protection
Heat to 410 DEG C keep the temperature 3 hours, solid solution diffusion the second phase, obtain the magnesium alloy ingot of solution treatment；
Step 3, hot extrusion: the magnesium alloy ingot that step 2 processing obtains is preheated 3 hours at 300 DEG C, is continuously heating to
390 DEG C preheat 3 hours, then carry out hot extrusion；Squeezing temperature is 410 DEG C, extrusion ratio 35:1, extruding rate 51s/m, is squeezed
Plate after pressure is air-cooled to room temperature, and the transversal dimensions of plate are 5mm × 40mm.
As shown in figure 4, its room temperature tensile mechanical property of high alloy content extrusion magnesium alloy obtained in the present embodiment are as follows:
At room temperature, tensile strength 352MPa, yield strength 198MPa, elongation at break 18.5%；At 100 DEG C, tensile strength
308MPa, yield strength 179MPa, elongation at break 33.6%, as shown in table 1, the mechanical property of magnesium alloy in the present embodiment
The mechanical property that the magnesium alloy of rare earth element is added in the magnesium alloy and comparative example 3 of Sn element can be not added with comparative example 1 and 2
It compares, is significantly improved, elongation percentage improves most obvious.
Comparative example 1
The magnesium alloy preparation of Sn element is not added, specific as follows:
Step 1, melting and casting: Al:5.8%, Zn:4.1%, surplus Mg are weighed according to weight fraction；First by magnesium
Ingot, which is put into the smelting furnace for be connected with mixed gas, to be heated to 500 DEG C and keeps the temperature 2 hours；Wherein, mixed gas SF6+CO2Mixing
Gas, SF6And CO2Volume ratio is 1:99；Temperature is risen to 680 DEG C after it is completely melt again, pure Al, Zn after preheating is added, to
Alloy molten solution is blown after being completely melt, stirred and is removed the gred；Then by alloy after temperature being risen to 700 DEG C, heat preservation 30 minutes
Melt is cast in grinding tool, and then cooling obtains alloy cast ingot in air.
(2) be dissolved: the magnesium alloy ingot that step 1 is obtained is placed in heat-treatment furnace, is heated to 430 DEG C under protection of argon gas
Heat preservation 3 hours, solid solution the second phase of diffusion, the magnesium alloy ingot after obtaining solution treatment.
(3) hot extrusion: the magnesium alloy ingot that step 2 processing obtains is subjected to 300 DEG C of preheatings in 2 hours, is continuously heating to
Then 390 DEG C carry out hot extrusion in preheating 1 hour；Squeezing temperature is 390 DEG C, extrusion ratio 35:1, extruding rate 52s/m, is squeezed
Plate after pressure is air-cooled to room temperature, and the cross sectional dimensions of plate is 5mm × 40mm.
As shown in figure 5, its room temperature tensile mechanical property of high alloy content extrusion magnesium alloy obtained in this comparative example are as follows:
At room temperature, tensile strength 283MPa, yield strength 163MPa, elongation at break 12.1%.At 100 DEG C, tensile strength
281MPa, yield strength 153MPa, elongation at break 15.3%.
Comparative example 2
The magnesium alloy preparation of Sn element is not added, specific as follows:
Step 1, melting and casting: Al:7.9%, Zn:1.9%, surplus Mg are weighed according to weight fraction；First by magnesium
Ingot, which is put into the smelting furnace for be connected with mixed gas, to be heated to 500 DEG C and keeps the temperature 2 hours；Wherein, mixed gas SF6+CO2Mixing
Gas, SF6And CO2Volume ratio is 1:99；Temperature is risen to 680 DEG C after it is completely melt again, pure Al, Zn after preheating is added, to
Alloy molten solution is blown after being completely melt, stirred and is removed the gred；Then by alloy after temperature being risen to 700 DEG C, heat preservation 30 minutes
Melt is cast in grinding tool, and then cooling obtains alloy cast ingot in air.
(2) be dissolved: the magnesium alloy ingot that step 1 is obtained is placed in heat-treatment furnace, is heated to 430 DEG C under protection of argon gas
Heat preservation 3 hours, solid solution the second phase of diffusion, the magnesium alloy ingot after obtaining solution treatment.
(3) hot extrusion: the magnesium alloy ingot that step 2 processing obtains is subjected to 300 DEG C of preheatings in 2 hours, is continuously heating to
Then 390 DEG C carry out hot extrusion in preheating 1 hour；Squeezing temperature is 390 DEG C, extrusion ratio 35:1, extruding rate 52s/m, is squeezed
Plate after pressure is air-cooled to room temperature, and the cross sectional dimensions of plate is 5mm × 40mm.
As shown in fig. 6, its room temperature tensile mechanical property of high alloy content extrusion magnesium alloy obtained in this comparative example are as follows:
At room temperature, tensile strength 302MPa, yield strength 168MPa, elongation at break 11.5%.At 100 DEG C, tensile strength
288MPa, yield strength 157MPa, elongation at break 14.8%.
Comparative example 3
Sn element is not added, the preparation of rare earth metal magnesium alloy is added, specific as follows:
(1) Al:7.6%, Zn:2.2%, Y:0.5%, surplus Mg melting and casting: are weighed according to weight fraction；First
Magnesium ingot is put into the smelting furnace for be connected with mixed gas and is heated to 500 DEG C and keeps the temperature 3 hours；Wherein, mixed gas SF6+CO2
Gaseous mixture, SF6And CO2Volume ratio is 1:99；Temperature is risen to 680 DEG C after it is completely melt again, be added preheating after pure Al,
Zn；It blown, stirred and is removed the gred after alloy molten solution is completely melt；Then temperature is risen to will after 700 DEG C, heat preservation 30 minutes
Alloy molten solution is cast in grinding tool, and then cooling obtains alloy cast ingot in air.
Step 2, solid solution: the magnesium alloy ingot that step 1 is obtained is placed in heat-treatment furnace, is heated under protection of argon gas
430 DEG C keep the temperature 3 hours, solid solution the second phase of diffusion, the magnesium alloy ingot after being dissolved；
Step 3, hot extrusion: the magnesium alloy ingot that step 2 processing obtains is subjected to 300 DEG C of preheatings in 2 hours, continues to heat up
It is preheated 1 hour to 390 DEG C and then carries out hot extrusion；Squeezing temperature is 390 DEG C, extrusion ratio 35:1, extruding rate 49s/m,
Plate after extruding is air-cooled to room temperature, and the cross sectional dimensions of plate is 5mm × 40mm.
As shown in fig. 7, its room temperature tensile mechanical property of high alloy content extrusion magnesium alloy obtained in this comparative example are as follows:
At room temperature, tensile strength 322MPa, yield strength 167MPa, elongation at break 9.5%.At 100 DEG C, tensile strength
301MPa, yield strength 160MPa, elongation at break 12.7%.
Comparative example 4
Step 1, melting and casting: Al:6.3%, Zn:4.3%, Sn:4.8%, surplus Mg are weighed according to parts by weight；
Magnesium ingot is put into first in the smelting furnace for be connected with mixed gas and is heated to 500 DEG C and keeps the temperature 2 hours；Wherein, mixed gas SF6
+CO2Gaseous mixture, SF6And CO2Volume ratio is 1:99；It carries out heating up for the first time again and temperature is risen to 700 DEG C is completely melt to magnesium ingot；
Then pure Al, Zn and Sn after preheating is added；It blown, stirred and is removed the gred after alloy is completely melt；Finally carry out second
Temperature is risen to 700 DEG C by secondary heating, and fusion process is completed in heat preservation after forty minutes；Alloy molten solution is cast in grinding tool, is then existed
Cooling obtains magnesium alloy ingot in air；
Step 2, solid solution: magnesium alloy ingot obtained in step 1 is placed in heat-treatment furnace, is added under protective gas protection
Heat to 410 DEG C keep the temperature 3 hours, solid solution diffusion the second phase, obtain the magnesium alloy ingot of solution treatment；
Step 3, hot extrusion: the magnesium alloy ingot that step 2 processing obtains is preheated 3 hours at 300 DEG C, is continuously heating to
390 DEG C preheat 2.5 hours, then carry out hot extrusion；Squeezing temperature is 410 DEG C, extrusion ratio 35:1, extruding rate 50s/m,
Plate after extruding is air-cooled to room temperature, and the transversal dimensions of plate are 5mm × 40mm.
As shown in figure 8, its room temperature tensile mechanical property of high alloy content extrusion magnesium alloy obtained in the present embodiment are as follows:
At room temperature, tensile strength 315MPa, yield strength 159Mpa, elongation at break 10.8%；At 100 DEG C, tensile strength
307Mpa, yield strength 154Mpa, elongation at break 14.4%, as shown in table 1.
Comparative example 5
Step 1, melting and casting: weighing Al:6.1%, Zn:4.6% according to parts by weight, and Sn:3.8% surplus is Mg；
Magnesium ingot is put into first in the smelting furnace for be connected with mixed gas and is heated to 500 DEG C and keeps the temperature 2.5 hours；Wherein, mixed gas is
SF6+CO2Gaseous mixture, SF6And CO2Volume ratio is 1:99；Carry out heating up for the first time again by temperature rise to 750 DEG C it is completely molten to magnesium ingot
Change；Then pure Al, Zn and Sn after preheating is added；It blown, stirred and is removed the gred after alloy is completely melt；Finally carry out
Temperature is risen to 780 DEG C by secondary temperature elevation, and fusion process is completed in heat preservation after forty minutes；Alloy molten solution is cast in grinding tool, then
Cooling obtains magnesium alloy ingot in air；
Step 2, solid solution: magnesium alloy ingot obtained in step 1 is placed in heat-treatment furnace, is added under protective gas protection
Heat to 410 DEG C keep the temperature 3 hours, solid solution diffusion the second phase, obtain the magnesium alloy ingot of solution treatment；
Step 3, hot extrusion: the magnesium alloy ingot that step 2 processing obtains is preheated 3 hours at 300 DEG C, is continuously heating to
390 DEG C preheat 2.5 hours, then carry out hot extrusion；Squeezing temperature is 410 DEG C, extrusion ratio 35:1, extruding rate 50s/m,
Plate after extruding is air-cooled to room temperature, and the transversal dimensions of plate are 5mm × 40mm.
Its room temperature tensile mechanical property of high alloy content extrusion magnesium alloy obtained in the present embodiment are as follows: at room temperature, resist
Tensile strength 298MPa, yield strength 160Mpa, elongation at break 11.2%；At 100 DEG C, tensile strength 287Mpa is bent
Take intensity be 158Mpa, elongation at break 12.8%, as shown in table 1.
Table 1
The magnesium alloy that preparation method of the invention obtains as can be seen from Table 1 has excellent mechanical property, closes the magnesium
Golden material also has high-ductility while having high intensity simultaneously.It is real as shown in Figs 1-4, apply the mechanical property of magnesium alloy in a 1-4
Can be compared with comparative example 1 and 2 be not added with the magnesium alloy of Sn element, mechanical property significantly improves, can have simultaneously it is high-intensitive and
High-ductility；As seen in figs. 5-6.Embodiment 1-4 is compared with adding the mechanical property of magnesium alloy of rare earth element in comparative example 3,
It is significantly improved, wherein elongation percentage improves most obvious, as shown in Figure 7.And in embodiment 3, the performance of magnesium alloy is best.
In addition, the magnesium alloy containing rare earth is at high cost, many and diverse energy consumption of preparation process, be not suitable for large-scale industrial production.
When Sn element additive amount is 4.8% in comparative example 4, when additive amount is more than 4.0%, the mechanical property of magnesium alloy is bright
Therefore aobvious decline by addition Sn and makes adjusting to its content, enabling magnesium alloy simultaneously has high-intensitive and high-ductility,
As shown in Figure 8.
The temperature of temperature-rise period twice of fusion process in comparative example 5 causes prepared by comparative example 5 more than 700 DEG C
Magnesium alloy mechanical property compared with embodiment 1-4 is decreased obviously.
To sum up, the mechanical property of the magnesium alloy of Sn element is added than being obviously improved for the performance of addition, and is not added
Add the magnesium alloy of the equally available high-strength and high-plasticity of rare earth, and passes through regulation additive amount, in embodiment 3, magnesium alloy
Performance is best.Using preparation method of the present invention, under the premise of improving magnesium alloy mechanical property, moreover it is possible to fund is saved,
Economy is high.
Although the embodiments of the present invention have been disclosed as above, but its is not only in the description and the implementation listed
With it can be fully applied to various fields suitable for the present invention, for those skilled in the art, can be easily
Realize other modification, therefore without departing from the general concept defined in the claims and the equivalent scope, the present invention is simultaneously unlimited
In specific details and legend shown and described herein.
Claims (10)
1. the magnesium alloy materials that a kind of high-strength plasticity high alloy content squeezes, which is characterized in that the high-strength plasticity high alloy contains
The magnesium alloy materials that amount squeezes are grouped as by following weight fraction group:
Al:5.8-6.2%, Zn:4-4.6%, Sn:0.99-4.0%, surplus Mg.
2. a kind of preparation method for the magnesium alloy materials that high-strength plasticity high alloy content squeezes, which is characterized in that including walking as follows
It is rapid:
Step 1 weighs Al:5.8-6.2%, Zn:4-4.6%, Sn:0.99-4.0%, surplus Mg according to parts by weight；By magnesium
Ingot is put into the melting furnace for being connected with protection gas and is heated and kept the temperature, and be warming up to for the first time after magnesium ingot melts completely, add
Enter remaining ingredient: Al, Zn and Sn are blown afloat, stirred and are removed the gred after alloy melts completely, are heated up and are protected by second
Fusion process is completed after temperature, is cast, and magnesium alloy ingot is obtained；
Step 2, by the obtained magnesium alloy ingot as in heat-treatment furnace, heat and keep the temperature under protection gas effect, be dissolved
The second phase is spread, the magnesium alloy ingot of solution treatment is obtained；
Step 3, hot extrusion carry out hot extrusion after the magnesium alloy ingot pre-heating temperature elevation of solution treatment, obtain magnesium after extruding and close
Golden plate material.
3. the preparation method for the magnesium alloy materials that high-strength plasticity high alloy content according to claim 2 squeezes, feature
It is, the magnesium alloy materials that the high-strength plasticity high alloy content squeezes are grouped as by following weight fraction group: Al:6.1%,
Zn:4.5%, Sn:3.0%, surplus Mg.
4. the preparation method for the magnesium alloy materials that high-strength plasticity high alloy content according to claim 3 squeezes, feature
It is, the heating temperature of magnesium ingot is 500 DEG C in the step 1, and first time warming temperature is 660-700 DEG C, second of temperature that heats up
Degree is 680-700 DEG C.
5. the preparation method for the magnesium alloy materials that high-strength plasticity high alloy content according to claim 4 squeezes, feature
It is, the protection gas of fusion process is SF in the step 16And CO2Gaseous mixture.
6. the preparation method for the magnesium alloy materials that high-strength plasticity high alloy content according to claim 5 squeezes, feature
It is, SF in the protection gas6: CO2, volume ratio 1:99.
7. the preparation method for the magnesium alloy materials that high-strength plasticity high alloy content according to claim 6 squeezes, feature
It is, extrusion temperature is 380-410 DEG C in step 3.
8. the preparation method for the magnesium alloy materials that high-strength plasticity high alloy content according to claim 7 squeezes, feature
It is, extrusion ratio is 35:1, extruding rate 50-51s/m in the hot extrusion process.
9. the preparation method for the magnesium alloy materials that high-strength plasticity high alloy content according to claim 8 squeezes, feature
It is, the sectional dimension of the magnesium alloy plate are as follows: 5mm × 40mm.
10. the preparation method for the magnesium alloy materials that high-strength plasticity high alloy content according to claim 9 squeezes, feature
It is, it is argon gas that gas is protected in the step 2.
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| CN109837437A (en) * | 2019-02-27 | 2019-06-04 | 吉林大学 | A kind of alternating temperature controlled rolling preparation method for making low content magnesium alloy that there is uniform fine grain |
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