CN116716509A - Preparation process of improved AZ91D magnesium alloy material for die casting product - Google Patents
Preparation process of improved AZ91D magnesium alloy material for die casting product Download PDFInfo
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- CN116716509A CN116716509A CN202310466652.3A CN202310466652A CN116716509A CN 116716509 A CN116716509 A CN 116716509A CN 202310466652 A CN202310466652 A CN 202310466652A CN 116716509 A CN116716509 A CN 116716509A
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- 239000000956 alloy Substances 0.000 title claims abstract description 120
- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 80
- 238000004512 die casting Methods 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 69
- 229910018575 Al—Ti Inorganic materials 0.000 claims abstract description 29
- 238000010438 heat treatment Methods 0.000 claims abstract description 22
- 238000003723 Smelting Methods 0.000 claims abstract description 18
- 239000000843 powder Substances 0.000 claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 13
- 229910052751 metal Inorganic materials 0.000 claims abstract description 12
- 239000002184 metal Substances 0.000 claims abstract description 12
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 11
- 238000003756 stirring Methods 0.000 claims abstract description 10
- 239000002893 slag Substances 0.000 claims abstract description 7
- 238000002844 melting Methods 0.000 claims description 19
- 230000008018 melting Effects 0.000 claims description 19
- 238000005520 cutting process Methods 0.000 claims description 12
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 8
- 239000011777 magnesium Substances 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 5
- 238000001746 injection moulding Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 229910052749 magnesium Inorganic materials 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 239000011787 zinc oxide Substances 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 abstract description 17
- 238000005260 corrosion Methods 0.000 abstract description 17
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 238000012795 verification Methods 0.000 description 4
- 230000004580 weight loss Effects 0.000 description 4
- 238000007792 addition Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000011780 sodium chloride Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000019441 ethanol Nutrition 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000004626 scanning electron microscopy Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000003856 thermoforming Methods 0.000 description 1
Classifications
-
- 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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/14—Treatment of metallic powder
- B22F1/142—Thermal or thermo-mechanical treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
- B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
-
- 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
-
- 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
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/0408—Light metal alloys
-
- 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
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/047—Making non-ferrous alloys by powder metallurgy comprising intermetallic compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
- B22F2009/043—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by ball milling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
- B22F2009/045—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by other means than ball or jet milling
- B22F2009/046—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by other means than ball or jet milling by cutting
-
- 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
- C22C23/02—Alloys based on magnesium with aluminium as the next major constituent
Abstract
The invention discloses a preparation process of an improved AZ91D magnesium alloy material for a die-casting product, which not only reduces the corrosion rate of the AZ91D magnesium alloy material in a poor environment, but also improves the comprehensive performance of the AZ91D magnesium alloy material. The invention comprises the following steps: s1, firstly, putting Al and Ti in a preset proportion into a vacuum smelting furnace for smelting, and repeatedly smelting to obtain an Al-Ti intermediate alloy; s2, placing the crucible into a resistance furnace, and then placing the prepared AZ91D magnesium alloy into the crucible for heating to enable the AZ91D magnesium alloy to be completely melted; s3, putting the Al-Ti intermediate alloy in the step S1 into a crucible according to a preset adding amount, and then stirring and heating to completely melt the Al-Ti intermediate alloy; s4, after the crucible is cooled, slag skimming is carried out, and then the alloy liquid is poured into a metal mold; s5, taking out the sample after the metal mold is cooled; s6, manufacturing the sample into alloy powder, and heating the alloy powder and performing die casting forming treatment to form the modified AZ91D magnesium alloy material product.
Description
Technical Field
The invention relates to the technical field of semi-solid pulping and extrusion molding of metals, in particular to a preparation process of an improved AZ91D magnesium alloy material for die casting products.
Background
The AZ91D alloy is an aluminum-containing magnesium alloy, has a series of excellent performances such as low density, good heat dissipation, high specific strength, good electromagnetic shielding, good manufacturing performance, strong dent resistance, good thermoforming effect and the like, and has been widely applied to industries such as automobiles, aerospace and the like.
However, the AZ91D magnesium alloy has the defects of poor corrosion resistance, low hardness, low strength and the like, so that the further development of the magnesium alloy is hindered.
Therefore, it is an important subject to be studied by those skilled in the art to find a solution capable of overcoming the above technical problems.
Disclosure of Invention
The embodiment of the invention discloses a preparation process of an improved AZ91D magnesium alloy material for a die-casting product, which not only reduces the corrosion rate of the AZ91D magnesium alloy material in a poor environment, but also improves the comprehensive performance of the AZ91D magnesium alloy material.
The embodiment of the invention provides a preparation process of an improved AZ91D magnesium alloy material for die casting products, which comprises the following steps:
s1, preparing an Al-Ti intermediate alloy: firstly, putting Al and Ti in a preset proportion into a vacuum smelting furnace for smelting, and repeatedly smelting until the Al and the Ti fully react to obtain an Al-Ti intermediate alloy;
s2, placing the crucible into a resistance furnace, and then placing the prepared AZ91D magnesium alloy into the crucible for heating to enable the AZ91D magnesium alloy to be completely melted;
s3, putting the Al-Ti intermediate alloy in the step S1 into the crucible according to a preset adding amount, and then stirring and heating to completely melt the Al-Ti intermediate alloy so as to form alloy liquid in the crucible;
s4, after the crucible is cooled, skimming slag, and then pouring alloy liquid in the crucible into a preheated metal mold;
s5, taking out a sample after the metal mold is cooled;
s6, manufacturing the sample into alloy powder, heating the alloy powder to form semi-solid state, and finally performing die casting forming treatment to form the improved AZ91D magnesium alloy material product.
Optionally, in the step S1, the preset ratio of Ti to Al is 9:5.
Optionally, in the step S1, before Al and Ti with preset proportions are put into a vacuum melting furnace for melting, a cutting machine is required to cut Al and Ti, a polisher is used for surface polishing after cutting, a surface oxide layer and impurities are removed, and then absolute ethyl alcohol is used for cleaning, so that surface dust is removed.
Optionally, in step S1, before the vacuum melting furnace performs melting, the vacuum melting furnace needs to be vacuumized to reach a high vacuum state of 1.0Pa, then argon is filled into the vacuum melting furnace for protection, and then melting is started.
Optionally, in the step S2, the crucible is a crucible coated with zinc oxide coating.
Optionally, the step S2 specifically includes:
placing the crucible into a resistance furnace, heating the crucible to 180-220 ℃ and preserving heat for 20-30min, then placing the prepared AZ91D magnesium alloy into the crucible, raising the temperature of the crucible to 660-700 ℃ and standing for 20-30min, so that the AZ91D magnesium alloy is completely melted.
Optionally, in the step S3, the added Ti content accounts for 0.1% -1% of the modified AZ91D magnesium alloy material.
Optionally, the step S3 specifically includes:
and (2) putting the Al-Ti intermediate alloy in the step (S1) into the crucible according to a preset adding amount, stirring for 2-4min by using a graphite rod, heating the crucible to 700-740 ℃, preserving heat for 20-30min, and stirring for multiple times during the preserving heat to completely melt the Al-Ti intermediate alloy, so that alloy liquid is formed in the crucible.
Optionally, the step S4 specifically includes:
and (3) after the crucible is cooled to 660-700 ℃, slag skimming is carried out, the crucible is placed for 10-20 min, then alloy liquid is poured into a preheated metal mould, and the pouring temperature is set to be about 660-700 ℃.
Optionally, the step S6 specifically includes:
cutting the sample into alloy scraps by a ball magnesium ingot cutting machine, grinding the alloy scraps by a ball mill, adopting nitrogen to resist flame in the middle, preparing alloy powder, heating to 560-600 ℃ in an injection molding machine to enable the alloy powder to be semi-solid, and finally spraying the alloy powder into a mold by a glue injection device to form an improved AZ91D magnesium alloy material product.
From the above technical solutions, the embodiment of the present invention has the following advantages:
in the embodiment, the principle that the Al-Ti intermediate alloy is added to improve the corrosion resistance of the AZ91D magnesium alloy is mainly that the grain size of the AZ91D magnesium alloy is reduced, the microstructure of the AZ91D magnesium alloy is refined after the Al-Ti intermediate alloy is added, the original coarse beta-Mg 17Al12 phase is changed into fine grains or short bars from a discontinuous network structure, and the coarse beta-Mg 17Al12 phase is dispersed and distributed, so that the micro-galvanic corrosion is effectively reduced, the harmful impurities are reduced, and the melt is purified.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic diagram of a process for preparing an improved AZ91D magnesium alloy material for die casting products according to the present invention;
FIG. 2 is an SEM image of an Al-Ti master alloy according to the present invention.
Fig. 3 shows the microstructure of a magnesium alloy material without Ti AZ91D added after solid solution.
FIG. 4 shows the microstructure of the modified Ti AZ91D magnesium alloy material of the present invention after solutionizing.
FIG. 5 is an as-cast SEM image of a modified AZ91D magnesium alloy material according to the present invention.
FIG. 6 shows the micro corrosion morphology of the modified AZ91D magnesium alloy material in 3.5% NaCl solution in the present invention.
Detailed Description
The embodiment of the invention discloses a preparation process of an improved AZ91D magnesium alloy material for a die-casting product, which not only reduces the corrosion rate of the AZ91D magnesium alloy material in a poor environment, but also improves the comprehensive performance of the AZ91D magnesium alloy material.
In order to better understand the aspects of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Referring to fig. 1, the preparation process of an improved AZ91D magnesium alloy material for die casting products provided in the embodiment of the present invention includes the following steps:
s1, preparing an Al-Ti intermediate alloy: firstly, putting Al and Ti in a preset proportion into a vacuum smelting furnace for smelting, and repeatedly smelting until the Al and the Ti fully react to obtain an Al-Ti intermediate alloy;
s2, placing the crucible into a resistance furnace, and then placing the prepared AZ91D magnesium alloy into the crucible for heating to enable the AZ91D magnesium alloy to be completely melted;
s3, putting the Al-Ti intermediate alloy in the step S1 into the crucible according to a preset adding amount, and then stirring and heating to completely melt the Al-Ti intermediate alloy so as to form alloy liquid in the crucible;
s4, after the crucible is cooled, skimming slag, and then pouring alloy liquid in the crucible into a preheated metal mold;
s5, taking out a sample after the metal mold is cooled;
s6, manufacturing the sample into alloy powder, heating the alloy powder to form semi-solid state, and finally performing die casting forming treatment to form the improved AZ91D magnesium alloy material product.
In the embodiment, the principle that the Al-Ti intermediate alloy is added to improve the corrosion resistance of the AZ91D magnesium alloy is mainly that the grain size of the AZ91D magnesium alloy is reduced, the microstructure of the AZ91D magnesium alloy is refined after the Al-Ti intermediate alloy is added, the original coarse beta-Mg 17Al12 phase is changed into fine grains or short bars from a discontinuous network structure, and the coarse beta-Mg 17Al12 phase is dispersed and distributed, so that the micro-galvanic corrosion is effectively reduced, the harmful impurities are reduced, and the melt is purified. In addition, the modified AZ91D magnesium alloy material can also be applied to the production of other products using AZ 91D.
Further, in the step S1, the preset ratio of Ti to Al is 9:5.
Further, in the step S1, before Al and Ti with a preset ratio are put into a vacuum melting furnace for melting, a cutting machine is required to cut Al and Ti, a polisher is used for polishing the surface after cutting, a surface oxide layer and impurities are removed, and then absolute ethyl alcohol is used for cleaning, so that surface dust is removed.
Further, in the step S1, before the vacuum melting furnace performs melting, the vacuum melting furnace needs to be vacuumized to reach a high vacuum state of 1.0Pa, then argon is filled into the vacuum melting furnace for protection, and then melting is started.
In the process of starting smelting, ti is firstly smelted independently, residual oxygen is removed, then Al is put into the smelted furnace for smelting, and the operation is mainly used for absorbing the residual oxygen in the vacuum smelting furnace by the Ti so as to avoid sample oxidation during smelting.
Further, in the step S1, the purpose of repeated smelting is to make Al react with Ti sufficiently, and the components for preparing the al—ti master alloy can be made uniform after being placed in the vacuum smelting furnace for a certain time.
Further, in the step S2, the crucible is a crucible coated with zinc oxide coating material.
Further, the step S2 specifically includes:
placing the crucible into a resistance furnace, heating the crucible to 180-220 ℃ and preserving heat for 20-30min, then placing the prepared AZ91D magnesium alloy into the crucible, raising the temperature of the crucible to 660-700 ℃ and standing for 20-30min, so that the AZ91D magnesium alloy is completely melted.
Further, in the step S3, the added Ti content accounts for 0.1% -1% of the modified AZ91D magnesium alloy material.
Further, the step S3 specifically includes:
and (2) putting the Al-Ti intermediate alloy in the step (S1) into the crucible according to a preset adding amount, stirring for 2-4min by using a graphite rod, heating the crucible to 700-740 ℃, preserving heat for 20-30min, and stirring for multiple times during the preserving heat to completely melt the Al-Ti intermediate alloy, so that alloy liquid is formed in the crucible.
Further, the step S4 specifically includes:
and (3) after the crucible is cooled to 660-700 ℃, slag skimming is carried out, the crucible is placed for 10-20 min, then alloy liquid is poured into a preheated metal mould, and the pouring temperature is set to be about 660-700 ℃.
Further, the step S6 specifically includes:
cutting the sample into alloy scraps by a ball magnesium ingot cutting machine, grinding the alloy scraps by a ball mill, adopting nitrogen to resist flame in the middle, preparing alloy powder, heating to 560-600 ℃ in an injection molding machine to enable the alloy powder to be semi-solid, and finally spraying the alloy powder into a mold by a glue injection device to form an improved AZ91D magnesium alloy material product.
Specifically, the model of the injection molding machine in this embodiment is 650T-JSW.
Argon is introduced to remove oxygen before heating in the injection molding machine, so as to prevent the sample from oxidizing.
Experimental example
Referring to fig. 1 to 6, in this embodiment, specific properties of the modified AZ91D magnesium alloy material for die casting products in the first embodiment were tested by a series of experiments:
after the sample in step S5 of example one was taken out, first, a corrosion test was performed on the sample and the untreated AZ91D magnesium alloy material in example one. Samples with different Ti contents and untreated AZ91D magnesium alloy were placed in 3.5% NaCl solution for 24 hours. Through researches, the sample weight loss corrosion rate is at least 0.3214 multiplied by 10 < -4 > g/(cm < 2 >. H). The corrosion rate was reduced by 59% compared to that without the addition of the Al-Ti alloy.
Table 1 shows the weight loss rates of AZ91D in 3.5% NaCl solutions with different Al-Ti master alloy additions. As can be seen from the table, the weight loss rate of the improved AZ91D magnesium alloy material obtained by the preparation process of the embodiment is reduced by about 50%, and the corrosion rate of the magnesium alloy is greatly delayed. As is clear from fig. 6, the modified AZ91D magnesium alloy material originally has a large area of corrosion densely distributed in a sheet shape, and instead, has a localized corrosion of a smaller size. In addition, when the Ti content is 0.1% -1%, the grain refinement effect is most remarkable at this time, the average grain size is 86 μm, and is reduced by more than three times than the original grain size of 307. Mu.m. In addition, when the Ti content is 0.1% -1%, not only the excellent performance of the AZ91D magnesium alloy is ensured, but also the corrosion resistance rate of the material is obviously increased.
TABLE 1 weight loss Rate of AZ91D magnesium alloys with different Al-Ti intermediate alloy additions
In fig. 3 and 4, it can be seen that the microstructure of the modified AZ91D magnesium alloy material after solid solution was compared with that of the AZ91D magnesium alloy material without al—ti intermediate alloy, and the average size thereof was three times different, and SEM analysis was performed on the modified AZ91D magnesium alloy material according to the present invention without al—ti intermediate alloy, in which a large amount of dendrites were present in the crystal grains and the second phase structure was coarse. After the process of example one, the beta-Mg 17Al12 in the modified AZ91D magnesium alloy material was transformed from the initial skeletal mesh to a granular or short rod shape. The second phase becomes finer and uniformly distributed.
In addition, in the experimental example, the modified AZ91D magnesium alloy material product obtained by the preparation process of the first embodiment and the untreated AZ91D magnesium alloy material product (original product) are compared after a series of formation verification such as salt spray, pencil, alcohol resistance and the like.
Table 2 is a chemical verification, from which it can be derived. The corrosion rate of the product produced by the original AZ91D magnesium alloy (unmodified AZ91D magnesium alloy) does not meet the formation verification requirement, but the defect is perfected well by the process, and the plasticity and toughness are better due to grain refinement, and the strength and hardness are enhanced.
Table 2 chemical formation verification
The above description is provided for the preparation process of the improved AZ91D magnesium alloy material for die casting products, and for those skilled in the art, according to the idea of the embodiment of the present invention, the details of the foregoing description should not be construed as limiting the invention.
Claims (10)
1. The preparation process of the improved AZ91D magnesium alloy material for the die-casting product is characterized by comprising the following steps of:
s1, preparing an Al-Ti intermediate alloy: firstly, putting Al and Ti in a preset proportion into a vacuum smelting furnace for smelting, and repeatedly smelting until the Al and the Ti fully react to obtain an Al-Ti intermediate alloy;
s2, placing the crucible into a resistance furnace, and then placing the prepared AZ91D magnesium alloy into the crucible for heating to enable the AZ91D magnesium alloy to be completely melted;
s3, putting the Al-Ti intermediate alloy in the step S1 into the crucible according to a preset adding amount, and then stirring and heating to completely melt the Al-Ti intermediate alloy so as to form alloy liquid in the crucible;
s4, after the crucible is cooled, skimming slag, and then pouring alloy liquid in the crucible into a preheated metal mold;
s5, taking out a sample after the metal mold is cooled;
s6, manufacturing the sample into alloy powder, heating the alloy powder to form semi-solid state, and finally performing die casting forming treatment to form the improved AZ91D magnesium alloy material product.
2. The process for producing an improved AZ91D magnesium alloy material for die casting products according to claim 1, wherein in step S1, the predetermined ratio of Ti to Al is 9:5.
3. The process for preparing the improved AZ91D magnesium alloy material for die-casting products according to claim 1, wherein in the step S1, before Al and Ti in a predetermined ratio are put into a vacuum melting furnace to be melted, it is necessary to cut Al and Ti by a cutting machine, and after cutting, surface polishing is performed by a polisher to remove surface oxide layers and impurities, and then cleaning is performed by absolute ethyl alcohol to remove surface dust.
4. The process for preparing an improved AZ91D magnesium alloy material for die casting products according to claim 1, wherein in step S1, before the vacuum melting furnace is melted, the vacuum melting furnace needs to be vacuumized to reach a high vacuum state of 1.0Pa, then argon is filled into the vacuum melting furnace for protection, and then melting is started.
5. The process for producing a modified AZ91D magnesium alloy material for a die casting product according to claim 1, wherein in said step S2, said crucible is a zinc oxide coating material-coated crucible.
6. The process for preparing an improved AZ91D magnesium alloy material for die casting products as claimed in claim 1, wherein said step S2 comprises:
placing the crucible into a resistance furnace, heating the crucible to 180-220 ℃ and preserving heat for 20-30min, then placing the prepared AZ91D magnesium alloy into the crucible, raising the temperature of the crucible to 660-700 ℃ and standing for 20-30min, so that the AZ91D magnesium alloy is completely melted.
7. The process for preparing an improved AZ91D magnesium alloy material for a die-casting product according to claim 1, wherein in said step S3, the added Ti content is 0.1% -1% of the improved AZ91D magnesium alloy material.
8. The process for preparing an improved AZ91D magnesium alloy material for die casting products as claimed in claim 1, wherein said step S3 comprises:
and (2) putting the Al-Ti intermediate alloy in the step (S1) into the crucible according to a preset adding amount, stirring for 2-4min by using a graphite rod, heating the crucible to 700-740 ℃, preserving heat for 20-30min, and stirring for multiple times during the preserving heat to completely melt the Al-Ti intermediate alloy, so that alloy liquid is formed in the crucible.
9. The process for preparing an improved AZ91D magnesium alloy material for die casting products as claimed in claim 1, wherein said step S4 comprises:
and (3) after the crucible is cooled to 660-700 ℃, slag skimming is carried out, the crucible is placed for 10-20 min, then alloy liquid is poured into a preheated metal mould, and the pouring temperature is set to be about 660-700 ℃.
10. The process for preparing an improved AZ91D magnesium alloy material for die casting products as claimed in claim 1, wherein said step S6 comprises:
cutting the sample into alloy scraps by a ball magnesium ingot cutting machine, grinding the alloy scraps by a ball mill, adopting nitrogen to resist flame in the middle, preparing alloy powder, heating to 560-600 ℃ in an injection molding machine to enable the alloy powder to be semi-solid, and finally spraying the alloy powder into a mold by a glue injection device to form an improved AZ91D magnesium alloy material product.
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