CN108048680B - A kind of magnesium-base composite material semi-solid state indirect extrusion casting forming method - Google Patents
A kind of magnesium-base composite material semi-solid state indirect extrusion casting forming method Download PDFInfo
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- CN108048680B CN108048680B CN201810047512.1A CN201810047512A CN108048680B CN 108048680 B CN108048680 B CN 108048680B CN 201810047512 A CN201810047512 A CN 201810047512A CN 108048680 B CN108048680 B CN 108048680B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/12—Making non-ferrous alloys by processing in a semi-solid state, e.g. holding the alloy in the solid-liquid phase
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/007—Semi-solid pressure die casting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/10—Alloys containing non-metals
- C22C1/1036—Alloys containing non-metals starting from a melt
- C22C1/1047—Alloys containing non-metals starting from a melt by mixing and casting liquid metal matrix composites
- C22C1/1052—Alloys containing non-metals starting from a melt by mixing and casting liquid metal matrix composites by mixing and casting metal matrix composites with reaction
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
- C22C23/04—Alloys based on magnesium with zinc or cadmium as the next major constituent
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Abstract
The present invention relates to a kind of magnesium-base composite material semi-solid state indirect extrusion casting forming methods, it is that generation poor for wetability between reinforcement particle and basis material, easy is reunited, is unevenly distributed, the low problem of cast properties obtained, the magnesium zinc yttrium quasi-crystalline substance that high rigidity, high elastic modulus and matrix excellent bonding performance are added in magnesium alloy substrate is reinforcement, the stirring of ultrasonic wave ancillary vibration, indirect extrusion casting in the melting of vacuum atmosphere smelting furnace, composite stirring furnace, casting is made, to improve the mechanical property of casting；This preparation method technique is advanced; data are accurately full and accurate; the metallographic structure compactness of casting is good, no shrinkage cavity and porosity defect, and primary phase is made of spherical and close spheric grain in metallographic structure; dendroid crystal grain disappears substantially; crystallite dimension obviously refines, and tensile strength reaches 225Mpa, and elongation percentage is up to 6.5%; hardness reaches 86HV, is advanced magnesium-base composite material semi-solid state indirect extrusion casting forming method.
Description
Technical field
The present invention relates to a kind of magnesium-base composite material semi-solid state indirect extrusion casting forming methods, belong to nonferrous materials system
Standby and application technical field.
Background technique
Magnesium alloy is high with light, specific strength and specific stiffness, thermal conductivity is good, damping vibration attenuation, is electromagnetically shielded, is easy to add
The good characteristics such as work forming and recycling, are listed in high-end new material；But that there are intensity is low, anti-oxidant for common magnesium alloy at present
The problem of performance difference and high-temperature creep resistance difference, limits its further applying in the industry；So improving magnesium alloy
Comprehensive performance, it is necessary to develop novel magnesium-based composite material；Currently, most of to use Al2O3、SiC、TiC、SiO2Particle
It is added in magnesium alloy substrate as reinforcement, to be made magnesium-based composite material, however additional particle and magnesium alloy substrate
Wetability is poor, easily reunites, is unevenly distributed in the base；Meanwhile interfacial reaction occurs for additional particle and magnesium alloy substrate,
Some harmful brittlement phases are generated, thus reduce the performance of composite material.
It prepares magnesium-based composite material and often uses stirring casting method, be to stir in the liquid state, the negative pressure generated in whipping process makes
Composite material is easy to air-breathing and forms stomata, in addition enhance particle and matrix alloy density difference easily cause particle deposit and
The agglomeration of subparticle forms the second phase segregation, and making enhances particle is unevenly distributed in matrix；It is poured in the liquid state
Note after molding the defects of cast-internal easily causes shrinkage cavity and shrinkage porosite, reduces the mechanical property of casting due to forming temperature height
Energy.
Summary of the invention
Goal of the invention
The purpose of the present invention is be directed to background technique deficiency, in magnesium alloy substrate add high rigidity, high elastic modulus,
Magnesium zinc yttrium quasi-crystalline substance with matrix excellent bonding performance is reinforcement, the ultrasonic wave in the melting of vacuum atmosphere smelting furnace, composite stirring furnace
Magnesium-based composite material casting is made, to improve the mechanical property of casting in ancillary vibration stirring, indirect extrusion casting.
Technical solution
The chemical substance material that the present invention uses are as follows: magnesium alloy, magnesium zinc yttrium quasi-crystalline substance, dehydrated alcohol, argon gas, magnesia demoulding
Agent it is as follows to prepare dosage: with gram, milliliter, centimetre3For measurement unit
The preparation method is as follows:
(1) indirect extrusion casting mold is prepared
Indirect extrusion casting mold hot-work die steel making, stent, motility model chamber surface roughness are equal are as follows:
Ra0.08-0.16μm；
(2) magnesium zinc yttrium quasi-crystalline substance is pre-processed
Magnesium zinc yttrium quasi-crystalline substance 1200g ± 1g is placed in the ball grinder of ball mill by ball milling, and the volume ratio of abrading-ball and powder is 3:
1, carry out ball milling, Ball-milling Time 2.5h, at magnesium zinc yttrium quasi-crystalline substance fine powder after ball milling；
Screening, magnesium zinc 400 mesh screens of yttrium quasi-crystalline substance fine powder are sieved, and ball milling, sieving are repeated, at magnesium zinc yttrium quasi-crystalline substance powder
End；
(3) magnesium alloy stripping and slicing
Magnesium alloy 20000g ± 1g is placed on steel plate, with mechanical stripping and slicing, block size≤20mm × 40mm ×
40mm；
(4) melting liquid magnesium alloy
The melting of liquid magnesium alloy is carried out in vacuum atmosphere smelting furnace, is melting, heat preservation under preheating, argon atmosphere
It completes in the process；
1. clearing up melting kettle, inside metal slice, metallic brush cleaning melting kettle, makes surface cleaning, use dehydrated alcohol
Wash heat inner surface of crucible makes its cleaning；
2. preheating magnesium alloy block, the magnesium alloy block of cutting being placed in preheating furnace, is preheated, preheating temperature is 155 DEG C,
It is spare；
3. preheating melting kettle, vacuum atmosphere smelting furnace heater is opened, melting kettle is preheated, 200 DEG C of preheating temperature, protects
Vacuum atmosphere smelting furnace heater is closed after warm 15min；
4. the magnesium alloy block of preheating is placed in the melting kettle of preheating, airtight vacuum atmosphere smelting furnace；
Vacuum atmosphere smelting furnace vacuum pump is opened, furnace air is extracted, makes pressure 2Pa in furnace；
It opens vacuum atmosphere smelting furnace heater and is passed through argon into vacuum atmosphere smelting furnace when temperature rises to 250 DEG C
Gas, argon gas are passed through speed 200cm3/ min makes pressure in furnace be maintained at 1 atmospheric pressure, and by vacuum atmosphere melting furnace outlet duct
Regulate and control with vacuum atmosphere smelting furnace air outlet valve；
Continue to heat melting, 720 DEG C ± 1 DEG C of smelting temperature, constant temperature keeps the temperature 15min；
5. being cooled to 690 DEG C ± 1 DEG C, constant temperature keeps the temperature 10min, at liquid magnesium alloy；
(5) ultrasonic wave added jet mixing prepares magnesium-base composite material semi-solid state alloy melt
1. closed jet mixing furnace opens jet mixing furnace vacuum pump, furnace air is extracted, pressure 2Pa in furnace is made；
2. jet mixing stove heating device is opened, preheating jet mixing crucible, 300 DEG C of preheating temperature；
When temperature rises to 300 DEG C, opens jet mixing furnace intake valve and stirred by jet mixing furnace air inlet pipe to whirl spraying
It mixes and is passed through argon gas in furnace, argon gas is passed through speed 200cm3/ min makes pressure in furnace be maintained at 1 atmospheric pressure, and by jet mixing
Furnace outlet duct and the regulation of jet mixing furnace air outlet valve；
3. opening vacuum atmosphere smelting furnace electromagnetic pump, liquid magnesium alloy is transported in jet mixing crucible by conveying pipeline；
The temperature in jet mixing furnace is adjusted, keeping in-furnace temperature is 570 DEG C ± 1 DEG C, and constant temperature keeps the temperature 6min, opens and adjusts
Jet mixing Setup Controller is saved, agitation revolution 100r/min, constant temperature stirs 10min, at semi-solid alloy melt；
4. opening ultrasonic vibration apparatus, ultrasonic frequency 90kHz；Jet mixing Setup Controller is adjusted, stirring turns
Number is 150r/min, mixing time 5min；
5. magnesium zinc yttrium quasi-crystalline substance powder is put into argon gas and quasi-crystalline substance mixing arrangement, argon gas and quasi-crystalline substance mixed input tube are opened, it will
It is mixed with the argon gas of quasicrystal particle, is added in semi-solid alloy melt by jet mixing device；
6. continuing to stir 8min under ultrasonic vibration apparatus auxiliary；
(6) semisolid indirect extrusion casting
1. preheating indirect extrusion casting mold, material cylinder, indirect extrusion casting mold preheating temperature is 235 DEG C, material cylinder preheating
Temperature is 345 DEG C；
Magnesia release agent is uniformly sprayed in mold cavity surface, surface thickness 0.2mm；
2. graphite lubricating oil (GLO) 150mL is injected in the gap between material cylinder and formed punch, it is lubricated；
3. closing jet mixing device, jet mixing furnace electromagnetic pump is opened, semi-solid alloy melt is defeated by discharge nozzle
It is sent in material cylinder；
4. indirect extrusion casting mold clamping, formed punch pushes semi-solid alloy melt to enter mold cavity by running channel, rushes
It is 95mm/s that the crown, which goes out speed, and then formed punch carries out pressure maintaining, dwell pressure 235Mpa, dwell time 15s；
5. being opened, demould, formed punch continues up, casting is ejected；
6. cooling down, casting is placed on steel plate, naturally cools to 25 DEG C；
(7) it clears up, clean
1. with mechanical cutting molding on steel plate；
2. clearing up each portion of casting and periphery, with 400 mesh sand paper polishing cast(ing) surface, washes of absolute alcohol, cleaning are then used
After dry；
(8) test, analysis and characterization
Test, analysis and characterization are carried out to the pattern of casting, color, metallurgical structure, mechanical property；
Metallographic structure analysis is carried out with metallographic microscope；
Diffracted intensity analysis is carried out with X-ray diffractometer；
Tensile strength and elongation percentage analysis are carried out with electronic universal tester；
Hardness analysis is carried out with Vickers；
Conclusion: the metallographic structure compactness of magnesium-based composite material casting is good, no shrinkage cavity and porosity defect, in metallographic structure just
Raw to be mutually made of spherical and close spheric grain, dendroid crystal grain disappears substantially, and crystallite dimension obviously refines, and tensile strength reaches
225Mpa, for elongation percentage up to 6.5%, hardness reaches 86HV.
Beneficial effect
There is apparent advance compared with the background technology, the present invention, be to be directed to moisten between reinforcement particle and basis material
Moist poor, easily generation is reunited, is unevenly distributed, the low problem of cast properties obtained, and high rigidity, height are added in magnesium alloy substrate
The magnesium zinc yttrium quasi-crystalline substance of elasticity modulus and matrix excellent bonding performance is reinforcement, through the melting of vacuum atmosphere smelting furnace, composite stirring furnace
Interior ultrasonic wave ancillary vibration stirring, indirect extrusion casting, are made casting, to improve the mechanical property of casting；This preparation method work
Skill is advanced, and data are accurately full and accurate, and the metallographic structure compactness of casting is good, no shrinkage cavity and porosity defect, in metallographic structure primary phase by
Spherical and close spheric grain composition, dendroid crystal grain disappear substantially, and crystallite dimension obviously refines, and tensile strength reaches 225Mpa, prolong
Rate is stretched up to 6.5%, and it is advanced magnesium-base composite material semi-solid state indirect extrusion casting forming method that hardness, which reaches 86HV,.
Detailed description of the invention
Fig. 1, magnesium-base composite material semi-solid state alloy melt preparing processes figure；
Fig. 2, semi-solid alloy melt fill mold cavity, formed punch state of pressure keeping figure；
Fig. 3, cast-internal metallographic structure figure；
Fig. 4, magnesium-based composite material X-ray diffraction intensity map；
As shown in the figure, list of numerals is as follows:
1, master control cabinet, 2, vacuum atmosphere smelting furnace, 3, jet mixing furnace, 4, vacuum atmosphere smelting furnace electromagnetic pump, 5, rotation
Spray rabble furnace electromagnetic pump, 6, jet mixing device, 7, jet mixing Setup Controller, the 8, first argon bottle, the 9, second argon bottle,
10, vacuum atmosphere smelting furnace air inlet pipe, 11, vacuum atmosphere smelting furnace intake valve, 12, vacuum atmosphere melting furnace outlet duct, 13, true
Air atmosphere smelting furnace air outlet valve, 14, jet mixing furnace air inlet pipe, 15, jet mixing furnace intake valve, 16, jet mixing furnace outlet
Pipe, 17, jet mixing furnace air outlet valve, the 18, first cable, the 19, second cable, 20, third cable, 21, melting kettle, 22, true
Air atmosphere smelting furnace heater, 23, vacuum atmosphere smelting furnace vacuum pump, 24, liquid magnesium alloy, 25, conveying pipeline, 26, conveying pipeline guarantor
Temperature set, 27, jet mixing crucible, 28, jet mixing stove heating device, 29, jet mixing furnace vacuum pump, 30, ultrasonic activation dress
It sets, 31, semi-solid alloy melt, 32, argon gas, 33, discharge nozzle, 34, argon gas and quasi-crystalline substance mixing arrangement, 35, stirring motor, 36,
Speed changer, 37, rotary joint, 38, argon gas and quasi-crystalline substance mixed input tube, 39, movable mold backboard, 40, movable mold, 41, stent,
42, the first mould bases, the 43, second mould bases, 44, third mould bases, the 45, the 4th mould bases, 46, material cylinder, 47, material cylinder heating and thermal insulation set, 48,
Material cylinder temperature measuring equipment, 49, formed punch, 50, injection rod, 51, casting.
Specific embodiment
The present invention will be further described below with reference to the accompanying drawings:
It is magnesium-base composite material semi-solid state alloy melt preparing processes figure, each portion position, connection relationship will be just shown in Fig. 1
Really, it firmly installs；
A whole set of preparation facilities is mainly by master control cabinet 1, vacuum atmosphere smelting furnace 2, jet mixing furnace 3, vacuum atmosphere melting
Furnace electromagnetic pump 4, jet mixing furnace electromagnetic pump 5, jet mixing device 6, jet mixing Setup Controller 7 form；
Master control cabinet 1 controls vacuum atmosphere smelting furnace 2, jet mixing furnace 3, vacuum atmosphere smelting furnace by the first cable 18
Electromagnetic pump 4, jet mixing furnace electromagnetic pump 5, vacuum atmosphere smelting furnace vacuum pump 23, jet mixing furnace vacuum pump 29 work shape
State；The first argon bottle 8 is connected on the left of master control cabinet 1, master control cabinet 1 passes through vacuum atmosphere smelting furnace air inlet pipe 10, vacuum atmosphere
Smelting furnace intake valve 11 is connect with vacuum atmosphere smelting furnace 2, and vacuum atmosphere smelting furnace 2 passes through vacuum atmosphere melting furnace outlet duct
12, vacuum atmosphere smelting furnace air outlet valve 13 carrys out pressure in regulating stove；Master control cabinet 1 passes through jet mixing furnace air inlet pipe 14, whirl spraying
Rabble furnace intake valve 15 is connect with jet mixing furnace 3, and jet mixing furnace 3 passes through jet mixing furnace outlet duct 16, jet mixing furnace
Air outlet valve 17 carrys out pressure in regulating stove；
Liquid magnesium alloy 24 is that melting is carried out in the melting kettle 21 of vacuum atmosphere smelting furnace 2, around melting kettle 21
Equipped with vacuum atmosphere smelting furnace heater 22, vacuum atmosphere smelting furnace 2 relies on vacuum atmosphere smelting furnace electromagnetic pump 4, conveying pipeline 25
It is connected with jet mixing furnace 3, conveying pipeline muff 26 is equipped with outside conveying pipeline 25；Vacuum atmosphere smelting furnace electromagnetic pump 4 is opened,
Liquid magnesium alloy 24 can be transported in the jet mixing crucible 27 of jet mixing furnace 3 by conveying pipeline 25；
It is equipped with jet mixing stove heating device 28 around jet mixing crucible 27, is equipped in the lower part of jet mixing crucible 27 super
The stirring end of acoustic vibration device 30, jet mixing device 6 is placed in the semi-solid alloy melt 31 in jet mixing crucible 27
In；
Jet mixing device 6 provides power by stirring motor 35, and stirring motor 35 passes through speed changer 36 and jet mixing
Device 6 connects, and jet mixing Setup Controller 7 controls the motion state of jet mixing device 6, whirl spraying by the second cable 19
Agitating device controller 7 is connect by third cable 20 with master control cabinet 1；
7 left side of jet mixing Setup Controller is connected with the second argon bottle 9, and jet mixing Setup Controller 7 is equipped with
Argon gas and quasi-crystalline substance mixing arrangement 34, argon gas and quasi-crystalline substance mixing arrangement 34 pass through argon gas and quasi-crystalline substance mixed input tube 38, rotary joint
37 connect with jet mixing device 6, and the argon gas 32 for being mixed with quasi-crystalline substance powder passes through argon gas and quasi-crystalline substance mixed input tube 38, rotary joint
37, jet mixing device 6 is passed into semi-solid alloy melt 31,30 semi-solid state assistant alloy melt 31 of ultrasonic vibration apparatus
In argon gas 32 be discharged.
Jet mixing crucible 27 is connect with jet mixing furnace electromagnetic pump 5, and semi-solid alloy melt 31 passes through jet mixing furnace
Electromagnetic pump 5, discharge nozzle 33 are transported in material cylinder 46.
Shown in Fig. 2, mold cavity, formed punch state of pressure keeping figure are filled for semi-solid alloy melt, injection rod 50 pushes formed punch
49 move upwards, and formed punch 49 pushes semi-solid alloy melt to enter mold cavity, and then formed punch 49 carries out pressure maintaining, after pressure maintaining
Casting 51 is made.
It is cast-internal metallographic structure figure shown in Fig. 3, as shown, the metallographic structure compactness of casting is good, no shrinkage cavity,
Shrinkage defect, primary phase is made of spherical and close spheric grain in metallographic structure, and dendroid crystal grain disappears substantially, and crystallite dimension is bright
Aobvious refinement.
It is magnesium-based composite material X-ray diffraction intensity map shown in Fig. 4, as shown, existing inside magnesium-based composite material
Mg phase, Icosahedral phases Mg3YZn6And Mg17Al12Phase.
Claims (2)
1. a kind of magnesium-base composite material semi-solid state indirect extrusion casting forming method, it is characterised in that:
The chemical substance material used are as follows: magnesium alloy, magnesium zinc yttrium quasi-crystalline substance, dehydrated alcohol, argon gas, magnesia release agent, graphite profit
Lubricating oil it is as follows to prepare dosage: with gram, milliliter, centimetre3For measurement unit
Magnesium alloy: AZ91D solid slug 20000g ± 1g
Magnesium zinc yttrium quasi-crystalline substance: Mg3YZn6Solid powder 1200g ± 1g
Dehydrated alcohol: C2H5OH liquid liquid 1000mL ± 50mL
Argon gas: Ar gaseous atmospheres 1200000cm3±100 cm3
Magnesia release agent: liquid liquid 350mL ± 5mL
Graphite lubricating oil (GLO): liquid liquid 150mL ± 5mL
The preparation method is as follows:
(1) indirect extrusion casting mold is prepared
Indirect extrusion casting mold hot-work die steel making, stent, motility model chamber surface roughness are equal are as follows: Ra0.08-
0.16μm；
(2) magnesium zinc yttrium quasi-crystalline substance is pre-processed
Magnesium zinc yttrium quasi-crystalline substance 1200g ± 1g is placed in the ball grinder of ball mill by ball milling, and the volume ratio of abrading-ball and powder is 3:1, into
Row ball milling, Ball-milling Time 2.5h, at magnesium zinc yttrium quasi-crystalline substance fine powder after ball milling；
Screening, magnesium zinc 400 mesh screens of yttrium quasi-crystalline substance fine powder are sieved, and ball milling, sieving are repeated, at magnesium zinc yttrium quasi-crystalline substance powder；
(3) magnesium alloy stripping and slicing
Magnesium alloy 20000g ± 1g is placed on steel plate, with mechanical stripping and slicing, block size≤20mm × 40mm × 40mm；
(4) melting liquid magnesium alloy
The melting of liquid magnesium alloy is carried out in vacuum atmosphere smelting furnace, is melting, insulating process under preheating, argon atmosphere
Middle completion；
1. clearing up melting kettle, inside metal slice, metallic brush cleaning melting kettle, makes surface cleaning, use washes of absolute alcohol
Melting kettle inner surface makes its cleaning；
2. preheating magnesium alloy block, the magnesium alloy block of cutting is placed in preheating furnace, is preheated, preheating temperature is 155 DEG C, standby
With；
3. preheating melting kettle, vacuum atmosphere smelting furnace heater is opened, melting kettle is preheated, 200 DEG C of preheating temperature, keeps the temperature
Vacuum atmosphere smelting furnace heater is closed after 15min；
4. the magnesium alloy block of preheating is placed in the melting kettle of preheating, airtight vacuum atmosphere smelting furnace；
Vacuum atmosphere smelting furnace vacuum pump is opened, furnace air is extracted, makes pressure 2Pa in furnace；
It opens vacuum atmosphere smelting furnace heater and is passed through argon gas, argon into vacuum atmosphere smelting furnace when temperature rises to 250 DEG C
Gas is passed through speed 200cm3/ min makes pressure in furnace be maintained at 1 atmospheric pressure, and by vacuum atmosphere melting furnace outlet duct and vacuum
The regulation of atmosphere smelting furnace air outlet valve；
Continue to heat melting, 720 DEG C ± 1 DEG C of smelting temperature, constant temperature keeps the temperature 15min；
5. being cooled to 690 DEG C ± 1 DEG C, constant temperature keeps the temperature 10min, at liquid magnesium alloy；
(5) ultrasonic wave added jet mixing prepares magnesium-base composite material semi-solid state alloy melt
1. closed jet mixing furnace opens jet mixing furnace vacuum pump, furnace air is extracted, pressure 2Pa in furnace is made；
2. jet mixing stove heating device is opened, preheating jet mixing crucible, 300 DEG C of preheating temperature；
When temperature rises to 300 DEG C, jet mixing furnace intake valve is opened, by jet mixing furnace air inlet pipe, to jet mixing furnace
It is inside passed through argon gas, argon gas is passed through speed 200cm3/ min makes pressure in furnace be maintained at 1 atmospheric pressure, and is gone out by jet mixing furnace
Tracheae and the regulation of jet mixing furnace air outlet valve；
3. opening vacuum atmosphere smelting furnace electromagnetic pump, liquid magnesium alloy is transported in jet mixing crucible by conveying pipeline；
The temperature in jet mixing furnace is adjusted, keeping in-furnace temperature is 570 DEG C ± 1 DEG C, and constant temperature keeps the temperature 6min, opens and adjusts rotation
Agitating device controller is sprayed, agitation revolution 100r/min, constant temperature stirs 10min, at semi-solid alloy melt；
4. opening ultrasonic vibration apparatus, ultrasonic frequency 90kHz；Jet mixing Setup Controller is adjusted, agitation revolution is
150r/min, mixing time 5min；
5. magnesium zinc yttrium quasi-crystalline substance powder is put into argon gas and quasi-crystalline substance mixing arrangement, argon gas and quasi-crystalline substance mixed input tube are opened, will be mixed with
The argon gas of quasicrystal particle is added in semi-solid alloy melt by jet mixing device；
6. continuing to stir 8min under ultrasonic vibration apparatus auxiliary；
(6) semisolid indirect extrusion casting
1. preheating indirect extrusion casting mold, material cylinder, indirect extrusion casting mold preheating temperature is 235 DEG C, material cylinder preheating temperature
It is 345 DEG C；
Magnesia release agent is uniformly sprayed in mold cavity surface, surface thickness 0.2mm；
2. graphite lubricating oil (GLO) 150mL is injected in the gap between material cylinder and formed punch, it is lubricated；
3. closing jet mixing device, jet mixing furnace electromagnetic pump is opened, semi-solid alloy melt is transported to by discharge nozzle
In material cylinder；
4. indirect extrusion casting mold clamping, formed punch pushes semi-solid alloy melt to enter mold cavity, formed punch top by running channel
Speed is 95mm/s out, and then formed punch carries out pressure maintaining, dwell pressure 235Mpa, dwell time 15s；
5. being opened, demould, formed punch continues up, casting is ejected；
6. cooling down, casting is placed on steel plate, naturally cools to 25 DEG C；
(7) it clears up, clean
1. with mechanical cutting molding on steel plate；
2. clearing up each portion of casting and periphery, with 400 mesh sand paper polishing cast(ing) surface, washes of absolute alcohol is then used, is dried in the air after cleaning
It is dry；
(8) test, analysis and characterization
Test, analysis and characterization are carried out to the pattern of casting, color, metallurgical structure, mechanical property；
Metallographic structure analysis is carried out with metallographic microscope；
Diffracted intensity analysis is carried out with X-ray diffractometer；
Tensile strength and elongation percentage analysis are carried out with electronic universal tester；
Hardness analysis is carried out with Vickers；
Conclusion: the metallographic structure compactness of magnesium-based composite material casting is good, no shrinkage cavity and porosity defect, primary phase in metallographic structure
It being made of spherical and close spheric grain, dendroid crystal grain disappears substantially, and crystallite dimension obviously refines, and tensile strength reaches 225Mpa,
For elongation percentage up to 6.5%, hardness reaches 86HV.
2. a kind of magnesium-base composite material semi-solid state indirect extrusion casting forming method according to claim 1, feature exist
In:
The metallographic structure compactness of casting is good, no shrinkage cavity and porosity defect, and primary phase is by spherical and close spheric grain in metallographic structure
Composition, dendroid crystal grain disappear substantially, and crystallite dimension obviously refines；
There are Mg phases, Icosahedral phases Mg inside magnesium-based composite material3YZn6And Mg17Al12Phase.
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| CN101608277B (en) * | 2009-06-02 | 2010-07-07 | 大连理工大学 | Electromagnetic/ultrasonic preparation method of in-situ particle reinforced magnesium-based composite material |
| JP5673157B2 (en) * | 2010-02-08 | 2015-02-18 | 日本軽金属株式会社 | Ultrasonic horn and method for producing aluminum alloy using the same |
| KR101222038B1 (en) * | 2010-12-27 | 2013-01-15 | 재단법인 포항산업과학연구원 | Method for producing a light alloy having dispersed Carbon nanotube |
| CN103468988B (en) * | 2013-09-14 | 2015-05-13 | 天津六合镁制品有限公司 | Preparation method of magnesium alloy |
| CN106077558B (en) * | 2016-06-20 | 2018-07-13 | 中北大学 | A kind of method and system of aluminium alloy semi-solid extrusion casint |
| CN107350453B (en) * | 2017-07-05 | 2019-03-05 | 中北大学 | Magnesium alloy casting semi-solid composite extrusion casting molding method |
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2018
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