CN111822534B - Extrusion method of SiC particle reinforced AZ91D magnesium-based composite pipe - Google Patents
Extrusion method of SiC particle reinforced AZ91D magnesium-based composite pipe Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21C23/00—Extruding metal; Impact extrusion
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- B21C23/08—Making wire, bars, tubes
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
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Abstract
The invention discloses an extrusion method of a SiC particle reinforced AZ91D magnesium-based composite pipe, and relates to the technical field of metal-based composite processing. The invention aims to solve the technical problem that the SiC particle reinforced magnesium matrix composite is easy to crack in extrusion. The method comprises the following steps: firstly, heating a SiC/AZ91D magnesium-based cast ingot; turning; thirdly, extruding the SiC/AZ91D magnesium-based ring blank in a magnesium-coated extrusion mode; fourthly, solid solution and aging. The method adopts a magnesium-coated extrusion mode to extrude the SiC/AZ91D magnesium-based ingot blank, the SiC/AZ91D magnesium-based ingot blank does not crack in the magnesium-coated extrusion process, and the obtained SiC particle reinforced AZ91D magnesium-based composite pipe has the characteristics of low density, high specific strength and specific stiffness, isotropy in physical properties, good damping and shock absorption, good electromagnetic shielding effect and the like. The method is used for obtaining the SiC particle reinforced AZ91D magnesium-based composite material pipe.
Description
Technical Field
The invention relates to the technical field of metal matrix composite processing.
Background
The density of the magnesium and the alloy thereof is 1.6 to 1.85g/cm3The alloy is about 1/4 which is the density of the traditional steel, is 61% lighter than the titanium alloy, is about 67% lower than the density of the aluminum alloy, is one of the lightest metal structural materials at present, and has the advantages of low density, high specific strength and specific rigidity, good thermal conductivity, good damping and shock absorption, good electromagnetic shielding effect, stable part size, easy recovery and the like. When the material is applied to engineering, the quality of a structural part can be greatly reduced, and the material becomes a structural functional material in light engineering, and the energy consumption can be effectively reduced. Meanwhile, the magnesium alloy is suitable for the fields of transportation equipment, aerospace equipment, military industry and the like, and is known as a green engineering material in the 21 st century.
The particle reinforced magnesium-based composite material overcomes the defects of low elastic modulus, low tensile strength, poor creep resistance, low hardness and the like when magnesium is used as an engineering material, and simultaneously has lower requirements on preparation cost and process complexity than those of a magnesium alloy material and isotropic physical properties, so that the particle reinforced magnesium-based composite material has the potential of being used as a light structural material. Becomes one of the main development directions of the traction and the demand of new pipe materials for aerospace and aviation. However, the magnesium alloy has less slip system and is difficult to plastically deform, and the addition of the ceramic particles causes the processing of the ceramic particle reinforced magnesium-based composite material to be more difficult due to the brittleness of the ceramic particles, so that the SiC particle reinforced magnesium-based composite material is easy to crack in extrusion.
Disclosure of Invention
The invention provides an extrusion method of a SiC particle reinforced AZ91D magnesium-based composite pipe, aiming at solving the technical problem that the SiC particle reinforced magnesium-based composite is easy to crack in extrusion.
An extrusion method of a SiC particle reinforced AZ91D magnesium-based composite pipe is specifically carried out according to the following steps:
firstly, heating the SiC/AZ91D magnesium-based ingot to 350-400 ℃, preserving heat for 4-5 h, turning the temperature to 400-450 ℃, preserving heat for 25-30 h, discharging and air cooling;
secondly, turning the air-cooled SiC/AZ91D magnesium-based ingot to obtain a SiC/AZ91D magnesium-based ring blank;
heating the SiC/AZ91D magnesium-based ring blank to 380-420 ℃, preserving heat for 5-8 hours, and extruding the SiC/AZ91D magnesium-based ring blank in a magnesium-coated extrusion mode to obtain a prefabricated pipe;
performing solution treatment on the prefabricated pipe for 1-3 hours at the temperature of 370-390 ℃, then heating to 400-420 ℃, preserving heat for 20-22 hours, and air cooling; and then carrying out aging treatment for 30-35 h at the temperature of 160-180 ℃ to obtain the SiC particle reinforced AZ91D magnesium-based composite material pipe.
In the third step, the step of extruding the SiC/AZ91D magnesium-based ring blank by adopting a magnesium-coated extrusion mode comprises the following steps:
welding a section of annular magnesium alloy on one end of a SiC/AZ91D magnesium-based annular blank, then preserving heat for 5-8 h at the temperature of 380-420 ℃, then placing the end of the SiC/AZ91D magnesium-based annular blank welded with the annular magnesium alloy into an extruder by taking one end as a head, and performing forward extrusion by adopting a conical die and controlling the extrusion ratio to be 1 (6-8), the temperature of the extruder to be 400-420 ℃, the extrusion speed to be 0.01-0.1 mm/s and the extrusion force to be 160-240 MPa.
Or, in the third step, the step of extruding the SiC/AZ91D magnesium-based ring blank by using a magnesium-clad extrusion mode is as follows:
manufacturing a magnesium alloy sleeve, wrapping the magnesium alloy sleeve outside the SiC/AZ91D magnesium-based ring blank by adopting a stamping mode, then preserving heat for 5-8 h at the temperature of 380-420 ℃, then putting the magnesium alloy sleeve into an extruder, adopting a conical die, controlling the extrusion ratio to be 1 (6-8), the temperature of the extruder to be 400-420 ℃, the extrusion speed to be 0.01-0.1 mm/s and the extrusion force to be 150-210 MPa, and carrying out forward extrusion.
The extrusion die of the extruder comprises an extrusion cylinder outer sleeve 3, an extrusion cylinder inner sleeve 2, an extrusion upper die head 1 and a conical die, wherein the conical die comprises an extrusion conical die 5 and a shearing die 6, the extrusion cylinder outer sleeve 3 is sleeved outside the extrusion cylinder inner sleeve 2, a ring blank 4 is arranged in the extrusion cylinder inner sleeve 2, the extrusion conical die 5 and the shearing die 6 are arranged below the ring blank 4, and an extrusion needle 7 of the extrusion upper die head 1 penetrates through the ring blank 4 and the conical die.
The invention has the beneficial effects that:
1. the invention relates to an extrusion method of SiC particle reinforced AZ91D magnesium-based composite material pipes, which respectively adopts a magnesium-coated extrusion mode to extrude SiC/AZ91D magnesium-based ring blanks, and the SiC/AZ91D magnesium-based ring blanks do not crack in the magnesium-coated extrusion process, thereby solving the problems of less slippage systems of magnesium alloy substrates, difficult plastic deformation, difficult processing and easy cracking of ceramic particle reinforced magnesium-based composite materials, and breaking through the core technology in the extrusion process of silicon carbide reinforced magnesium-based composite materials.
2. The SiC particle reinforced AZ91D magnesium-based composite material pipe prepared by the invention has the characteristics of light weight, high specific strength and specific stiffness, isotropy in physical properties, good damping and shock absorption, good electromagnetic shielding effect and the like, has huge application potential, can be used in the fields of national defense, aerospace, transportation and the like, and supports the urgent need of high-technology fields represented by manned space on metal-based composite materials.
Through tests, the tensile strength of the SiC particle reinforced AZ91D magnesium-based composite material pipe prepared by the method is 408MPa, the yield strength is 312MPa, the elongation is 2.3%, and the elastic modulus is 73 GPa.
The method is used for obtaining the SiC particle reinforced AZ91D magnesium-based composite material pipe.
Drawings
Fig. 1 is a schematic structural diagram of an extrusion die of an extruder according to an embodiment, where 1 is an extrusion upper die head, 2 is an inner sleeve of an extrusion cylinder, 3 is an outer sleeve of the extrusion cylinder, 4 is a ring blank, 5 is an extrusion cone die, 6 is a shearing die, and 7 is an extrusion needle;
FIG. 2 is a photograph of a SiC particle reinforced AZ91D Mg-based composite tube made in accordance with example one;
FIG. 3 is a photograph of a SiC particle reinforced AZ91D Mg-based composite tube prepared by a prior art method;
fig. 4 is an enlarged photograph of a SiC particle reinforced AZ91D mg-based composite pipe prepared by a prior art method.
Detailed Description
The technical solution of the present invention is not limited to the specific embodiments listed below, and includes any combination of the specific embodiments.
The first embodiment is as follows: the embodiment of the invention relates to an extrusion method of a SiC particle reinforced AZ91D magnesium-based composite pipe, which specifically comprises the following steps:
firstly, heating the SiC/AZ91D magnesium-based ingot to 350-400 ℃, preserving heat for 4-5 h, turning the temperature to 400-450 ℃, preserving heat for 25-30 h, discharging and air cooling;
secondly, turning the air-cooled SiC/AZ91D magnesium-based ingot to obtain a SiC/AZ91D magnesium-based ring blank;
heating the SiC/AZ91D magnesium-based ring blank to 380-420 ℃, preserving heat for 5-8 hours, and extruding the SiC/AZ91D magnesium-based ring blank in a magnesium-coated extrusion mode to obtain a prefabricated pipe;
performing solution treatment on the prefabricated pipe for 1-3 hours at the temperature of 370-390 ℃, then heating to 400-420 ℃, preserving heat for 20-22 hours, and air cooling; and then carrying out aging treatment for 30-35 h at the temperature of 160-180 ℃ to obtain the SiC particle reinforced AZ91D magnesium-based composite material pipe.
The beneficial effects of the embodiment are as follows:
1. according to the extrusion method of the SiC particle reinforced AZ91D magnesium-based composite material pipe, the SiC/AZ91D magnesium-based ring blank is extruded in a magnesium-coated extrusion mode, and the phenomenon that the SiC/AZ91D magnesium-based ring blank cracks does not occur in the magnesium-coated extrusion process, so that the problems that the elongation of the composite material is low after metal matrix is reinforced by ceramic particles and the composite material is easy to crack in the extrusion process are solved, and the core technology in the extrusion process of the silicon carbide reinforced magnesium-based composite material is broken through.
2. The SiC particle reinforced AZ91D magnesium-based composite material pipe prepared by the embodiment has the characteristics of low density, high specific strength and specific stiffness, isotropy in physical properties, good damping and shock absorption, good electromagnetic shielding effect and the like, has huge application potential, can be used in the fields of national defense, aerospace, transportation and the like, and supports the urgent need of high-technology fields represented by manned aerospace on metal-based composite materials.
The second embodiment is as follows: the first difference between the present embodiment and the specific embodiment is: the SiC/AZ91D magnesium-based ingot in the step one is cast by a semi-solid stirring method, and the specific casting process is as follows: heating AZ91D magnesium alloy to 700-750 ℃, adding SiC particles, cooling to 580-595 ℃, and stirring, wherein the stirring speed is controlled to be 800-1000 r/min, and the stirring time is 30-40 min; and heating to 730-750 ℃, controlling the stirring speed to be 200-300 r/min, stirring for 15-25 min to obtain a melt, and injecting the melt into a mold for casting and molding to obtain the SiC/AZ91D magnesium-based ingot. The rest is the same as the first embodiment.
The third concrete implementation mode: the present embodiment differs from the first or second embodiment in that: the AZ91D magnesium alloy comprises the following components in percentage by mass: al is more than or equal to 8.3 percent and less than or equal to 9.7 percent, Zn is more than or equal to 0.35 percent and less than or equal to 1.0 percent, Mn is more than or equal to 0.15 percent and less than or equal to 0.5 percent, and the balance is Mg. The other is the same as in the first or second embodiment.
The fourth concrete implementation mode: the difference between this embodiment mode and one of the first to third embodiment modes is: the volume percentage of SiC particles in the SiC/AZ91D magnesium-based ingot is 10%. The others are the same as in one of the first to third embodiments.
The purity of the SiC particles was 98.90%.
The fifth concrete implementation mode: the difference between this embodiment and one of the first to fourth embodiments is: and in the second step, the turning processing adopts a lathe, and the turned SiC/AZ91D magnesium-based ring blank has the outer diameter of 270mm, the inner diameter of 130mm and the length of 450 mm. The other is the same as one of the first to fourth embodiments.
The sixth specific implementation mode: the difference between this embodiment and one of the first to fifth embodiments is: in the third step, the step of extruding the SiC/AZ91D magnesium-based ring blank by adopting a magnesium-coated extrusion mode comprises the following steps:
welding a section of annular magnesium alloy on one end of a SiC/AZ91D magnesium-based annular blank, then preserving heat for 5-8 h at the temperature of 380-420 ℃, then placing the end of the SiC/AZ91D magnesium-based annular blank welded with the annular magnesium alloy into an extruder by taking one end as a head, and performing forward extrusion by adopting a conical die and controlling the extrusion ratio to be 1 (6-8), the temperature of the extruder to be 400-420 ℃, the extrusion speed to be 0.01-0.1 mm/s and the extrusion force to be 160-240 MPa. The other is the same as one of the first to fifth embodiments.
The seventh embodiment: the difference between this embodiment and one of the first to sixth embodiments is: the inner diameter ratio of the annular magnesium alloy to the SiC/AZ91D magnesium-based annular blank is 1:1, external diameter ratio of 1:1, the length ratio is (3-5): 25. the other is the same as one of the first to sixth embodiments.
The specific implementation mode is eight: the present embodiment differs from one of the first to seventh embodiments in that: in the third step, the step of extruding the SiC/AZ91D magnesium-based ring blank by adopting a magnesium-coated extrusion mode comprises the following steps:
manufacturing a magnesium alloy sleeve, wrapping the magnesium alloy sleeve outside the SiC/AZ91D magnesium-based ring blank by adopting a stamping mode, then preserving heat for 5-8 h at the temperature of 380-420 ℃, then putting the magnesium alloy sleeve into an extruder, adopting a conical die, controlling the extrusion ratio to be 1 (6-8), the temperature of the extruder to be 400-420 ℃, the extrusion speed to be 0.01-0.1 mm/s and the extrusion force to be 150-210 MPa, and carrying out forward extrusion. The other is the same as one of the first to seventh embodiments.
The specific implementation method nine: the present embodiment differs from the first to eighth embodiments in that: the length ratio of the magnesium alloy sleeve to the SiC/AZ91D magnesium-based ring blank is 1:1, and the outer diameter ratio is 27 (23-25). The rest is the same as the first to eighth embodiments.
The detailed implementation mode is ten: the present embodiment differs from one of the first to ninth embodiments in that: the extrusion die of the extruder comprises an extrusion cylinder outer sleeve 3, an extrusion cylinder inner sleeve 2, an extrusion upper die head 1 and a conical die, wherein the conical die comprises an extrusion conical die 5 and a shearing die 6, the extrusion cylinder outer sleeve 3 is sleeved outside the extrusion cylinder inner sleeve 2, a ring blank 4 is arranged in the extrusion cylinder inner sleeve 2, the extrusion conical die 5 and the shearing die 6 are arranged below the ring blank 4, an extrusion needle 7 of the extrusion upper die head 1 penetrates through the ring blank 4 and the conical die, and the cone angle of the extrusion conical die is 50-60 degrees. The other is the same as one of the first to ninth embodiments.
The following examples were used to demonstrate the beneficial effects of the present invention:
the first embodiment is as follows:
the extrusion method of the SiC particle reinforced AZ91D magnesium-based composite pipe is specifically carried out according to the following steps:
firstly, heating the SiC/AZ91D magnesium-based ingot to 380 ℃, preserving heat for 4.5h, turning the temperature to 420 ℃, preserving heat for 27h, discharging and air cooling;
secondly, turning the air-cooled SiC/AZ91D magnesium-based ingot to obtain a SiC/AZ91D magnesium-based ring blank; obtaining a magnesium-based ring blank of SiC/AZ91D with the specification of phi 270/130 x 450 mm;
thirdly, heating the SiC/AZ91D magnesium-based ring blank to 400 ℃, preserving heat for 6 hours, and immediately extruding the SiC/AZ91D magnesium-based ring blank in a magnesium-coated extrusion mode to obtain a prefabricated pipe;
performing solution treatment on the prefabricated pipe for 2 hours at the temperature of 380 ℃, then heating to 420 ℃, preserving heat for 22 hours, and cooling in air; and then carrying out aging treatment for 32h at the temperature of 175 ℃ to obtain the SiC particle reinforced AZ91D magnesium-based composite material pipe.
Step three, the step of extruding the SiC/AZ91D magnesium-based ring blank by adopting a magnesium-coated extrusion mode comprises the following steps:
welding a section of annular magnesium alloy at one end of a SiC/AZ91D magnesium-based ring blank, then preserving heat for 6 hours at the temperature of 380-420 ℃, then placing the SiC/AZ91D magnesium-based ring blank with one end of the welded annular magnesium alloy as a head into a 2000-ton extruding machine, adopting a conical die, controlling the extrusion ratio to be 1 (6-8), the temperature of the extruding cylinder to be 405 ℃, the extrusion speed to be 0.04mm/s and the extrusion force to be 160-240 MPa, and carrying out forward extrusion; wherein the specification of the annular magnesium alloy is phi 270/130 x 80 mm.
Example two:
the extrusion method of the SiC particle reinforced AZ91D magnesium-based composite pipe is specifically carried out according to the following steps:
firstly, heating the SiC/AZ91D magnesium-based ingot to 380 ℃, preserving heat for 4.5h, turning the temperature to 420 ℃, preserving heat for 27h, discharging and air cooling;
secondly, turning the air-cooled SiC/AZ91D magnesium-based ingot to obtain a SiC/AZ91D magnesium-based ring blank; the specification of the SiC/AZ91D magnesium-based ring blank is phi 240/130 x 450 mm;
thirdly, heating the SiC/AZ91D magnesium-based ring blank to 400 ℃, preserving heat for 6 hours, and immediately extruding the SiC/AZ91D magnesium-based ring blank in a magnesium-coated extrusion mode to obtain a prefabricated pipe;
performing solution treatment on the prefabricated pipe for 2 hours at the temperature of 380 ℃, then heating to 420 ℃, preserving heat for 22 hours, and cooling in air; and then carrying out aging treatment for 32h at the temperature of 175 ℃ to obtain the SiC particle reinforced AZ91D magnesium-based composite material pipe.
In the third step, the step of extruding the SiC/AZ91D magnesium-based ring blank by adopting a magnesium-coated extrusion mode comprises the following steps:
manufacturing an AZ91D magnesium alloy sleeve with the specification of phi 270/240 x 450mm, wrapping the magnesium alloy sleeve outside a SiC/AZ91D magnesium-based ring blank in a stamping mode to obtain a tube blank with the outer diameter of 270mm and the inner diameter of 130mm, then preserving heat for 5-8 hours at the temperature of 400 ℃, then putting the tube blank into an extruder, and performing forward extrusion by adopting a conical die and controlling the extrusion ratio to be 1 (6-8), the temperature of the extruder to be 405 ℃, the extrusion speed to be 0.04mm/s and the extrusion force to be 150-210 MPa.
As shown in fig. 2, the SiC particle reinforced AZ91D mg-based composite pipe obtained in the first example has no cracking phenomenon during the aluminum-clad extrusion process, while as can be seen from fig. 3 and 4, the SiC particle reinforced AZ91D mg-based composite pipe prepared by the prior art has edge cracking and cracking phenomena during the extrusion process. Through tests, the tensile strength of the SiC particle reinforced AZ91D magnesium-based composite material pipe prepared by the method is 408MPa, the yield strength is 312MPa, the elongation is 2.3%, and the elastic modulus is 73 GPa.
The extrusion die of the extruder comprises an extrusion cylinder outer sleeve 3, an extrusion cylinder inner sleeve 2, an extrusion upper die head 1 and a conical die, wherein the conical die comprises an extrusion conical die 5 and a shearing die 6, the extrusion cylinder outer sleeve 3 is sleeved outside the extrusion cylinder inner sleeve 2, a ring blank 4 is arranged in the extrusion cylinder inner sleeve 2, the extrusion conical die 5 and the shearing die 6 are arranged below the ring blank 4, an extrusion needle 7 of the extrusion upper die head 1 penetrates through the ring blank 4 and the conical die, and the cone angle of the extrusion conical die is 55 degrees.
The beneficial effects of the embodiment:
1. a method for extruding a SiC particle reinforced AZ91D magnesium-based composite material pipe comprises the steps of respectively extruding a SiC/AZ91D magnesium-based ingot blank in two magnesium-coated extrusion modes, wherein the SiC/AZ91D magnesium-based ingot blank does not crack in the magnesium-coated extrusion process, so that the problems of poor processing deformation performance of magnesium alloy, low elongation of a composite material after ceramic particles are added and easy cracking in the extrusion process are solved, and the core technology in the extrusion process of the silicon carbide particle reinforced magnesium-based composite material is broken through.
2. The SiC particle reinforced AZ91D magnesium-based composite material pipe prepared by the embodiment has the characteristics of light weight, high specific strength and specific stiffness, good thermal conductivity, good damping and shock absorption and the like, has huge application potential, can be used in the fields of national defense, aerospace, transportation and the like, and supports the urgent need of high-technology fields represented by manned space on metal-based composite materials.
Claims (5)
1. The extrusion method of the SiC particle reinforced AZ91D magnesium-based composite material pipe is characterized by comprising the following steps:
heating the SiC/AZ91D magnesium-based ingot to 350-400 ℃, preserving heat for 4-5 h, turning the temperature to 400-450 ℃, preserving heat for 25-30 h, discharging and air cooling;
step (II), turning the air-cooled SiC/AZ91D magnesium-based ingot to obtain a SiC/AZ91D magnesium-based ring blank;
heating the SiC/AZ91D magnesium-based ring blank to 380-420 ℃, preserving heat for 5-8 hours, and extruding the SiC/AZ91D magnesium-based ring blank in a magnesium-coated extrusion mode to obtain a prefabricated pipe;
step four, performing solution treatment on the prefabricated pipe for 1-3 hours at the temperature of 370-390 ℃, then heating to 400-420 ℃, preserving heat for 20-22 hours, and air cooling; then, carrying out aging treatment for 30-35 h at the temperature of 160-180 ℃ to obtain a SiC particle reinforced AZ91D magnesium-based composite material pipe;
in the step (III), the step of extruding the SiC/AZ91D magnesium-based ring blank by adopting a magnesium-coated extrusion mode comprises the following steps:
welding a section of annular magnesium alloy at one end of a SiC/AZ91D magnesium-based annular blank, then preserving heat for 5-8 h at the temperature of 380-420 ℃, then taking one end of the SiC/AZ91D magnesium-based annular blank welded with the annular magnesium alloy as a head, putting the head into an extruder, and performing forward extrusion by adopting a conical die and controlling the extrusion ratio to be 1 (6-8), the temperature of the extruder to be 400-420 ℃, the extrusion speed to be 0.01-0.1 mm/s and the extrusion force to be 160-240 MPa; the inner diameter ratio of the annular magnesium alloy to the SiC/AZ91D magnesium-based annular blank is 1:1, external diameter ratio of 1:1, the length ratio is (3-5): 25;
or, in the step (three), the step of extruding the SiC/AZ91D magnesium-based ring blank by adopting a magnesium-coated extrusion mode comprises the following steps:
manufacturing a magnesium alloy sleeve, wrapping the magnesium alloy sleeve outside a SiC/AZ91D magnesium-based ring blank by adopting a stamping mode, then preserving heat for 5-8 h at the temperature of 380-420 ℃, then putting the magnesium alloy sleeve into an extruder, adopting a conical die, controlling the extrusion ratio to be 1 (6-8), the temperature of the extruder to be 400-420 ℃, the extrusion speed to be 0.01-0.1 mm/s and the extrusion force to be 150-210 MPa, and carrying out forward extrusion; the length ratio of the magnesium alloy sleeve to the SiC/AZ91D magnesium-based ring blank is 1:1, and the outer diameter ratio is 27 (23-25);
the extrusion die of the extruder comprises an extrusion cylinder outer sleeve (3), an extrusion cylinder inner sleeve (2), an extrusion upper die head (1) and a conical die, wherein the conical die comprises an extrusion conical die (5) and a shearing die (6), the extrusion cylinder outer sleeve (3) is sleeved outside the extrusion cylinder inner sleeve (2), a ring blank (4) is arranged in the extrusion cylinder inner sleeve (2), the extrusion conical die (5) and the shearing die (6) are arranged below the ring blank (4), and an extrusion needle (7) of the extrusion upper die head (1) penetrates through the ring blank (4) and the conical die.
2. The method for extruding the SiC particle reinforced AZ91D Mg-based composite pipe material as claimed in claim 1, wherein the SiC/AZ91D Mg-based ingot in step (I) is cast by semi-solid stirring method, and the casting process is as follows: heating AZ91D magnesium alloy to 700-750 ℃, adding SiC particles, cooling to 580-595 ℃, and stirring, wherein the stirring speed is controlled to be 800-1000 r/min, and the stirring time is 30-40 min; and heating to 730-750 ℃, controlling the stirring speed to be 200-300 r/min, stirring for 15-25 min to obtain a melt, and injecting the melt into a mold for casting and molding to obtain the SiC/AZ91D magnesium-based ingot.
3. The extrusion method of the SiC particle reinforced AZ91D Mg-based composite material pipe as claimed in claim 2, wherein the components of the AZ91D magnesium alloy in percentage by mass are: al is more than or equal to 8.3 percent and less than or equal to 9.7 percent, Zn is more than or equal to 0.35 percent and less than or equal to 1.0 percent, Mn is more than or equal to 0.15 percent and less than or equal to 0.5 percent, and the balance is Mg.
4. The extrusion method of the SiC particle reinforced AZ91D Mg-based composite pipe as claimed in claim 2, wherein the SiC particle content in the SiC/AZ91D Mg-based ingot is 10% by volume.
5. The extrusion method of SiC particle reinforced AZ91D Mg-based composite material pipe as claimed in claim 1, wherein the turning in step (II) is performed by using a lathe, and the turned SiC/AZ91D Mg-based ring blank has an outer diameter of 270mm, an inner diameter of 130mm and a length of 450 mm.
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| CN110257741B (en) * | 2019-07-01 | 2021-03-30 | 东北轻合金有限责任公司 | Extrusion method of SiC particle reinforced 6092 aluminum matrix composite material profile |
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