CN117512407A - High-temperature-resistant super-structure aluminum alloy and preparation method thereof - Google Patents
High-temperature-resistant super-structure aluminum alloy and preparation method thereof Download PDFInfo
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- CN117512407A CN117512407A CN202311409261.4A CN202311409261A CN117512407A CN 117512407 A CN117512407 A CN 117512407A CN 202311409261 A CN202311409261 A CN 202311409261A CN 117512407 A CN117512407 A CN 117512407A
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 70
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 238000000498 ball milling Methods 0.000 claims abstract description 35
- 238000005245 sintering Methods 0.000 claims abstract description 32
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000000843 powder Substances 0.000 claims abstract description 31
- 229910018516 Al—O Inorganic materials 0.000 claims abstract description 29
- 239000002131 composite material Substances 0.000 claims abstract description 23
- 239000006104 solid solution Substances 0.000 claims abstract description 21
- 229910001593 boehmite Inorganic materials 0.000 claims abstract description 18
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 claims abstract description 18
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims abstract description 17
- 238000011065 in-situ storage Methods 0.000 claims abstract description 14
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 12
- 238000004886 process control Methods 0.000 claims abstract description 12
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 238000011049 filling Methods 0.000 claims abstract description 8
- 238000000465 moulding Methods 0.000 claims abstract description 8
- 238000003825 pressing Methods 0.000 claims abstract description 4
- 238000005303 weighing Methods 0.000 claims abstract description 4
- 238000002156 mixing Methods 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 15
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 11
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 9
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 9
- 239000011159 matrix material Substances 0.000 claims description 9
- 239000013078 crystal Substances 0.000 claims description 7
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 6
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 6
- 239000012300 argon atmosphere Substances 0.000 claims description 6
- 235000021355 Stearic acid Nutrition 0.000 claims description 5
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 5
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 5
- 239000008117 stearic acid Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- DKGAVHZHDRPRBM-UHFFFAOYSA-N Tert-Butanol Chemical compound CC(C)(C)O DKGAVHZHDRPRBM-UHFFFAOYSA-N 0.000 claims description 3
- 235000011187 glycerol Nutrition 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 2
- 238000005728 strengthening Methods 0.000 abstract description 10
- 125000004430 oxygen atom Chemical group O* 0.000 abstract description 5
- 239000006185 dispersion Substances 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 230000002195 synergetic effect Effects 0.000 abstract description 3
- 238000009826 distribution Methods 0.000 abstract description 2
- 229910052782 aluminium Inorganic materials 0.000 description 15
- 239000002994 raw material Substances 0.000 description 10
- 239000000203 mixture Substances 0.000 description 8
- 239000000956 alloy Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 239000000919 ceramic Substances 0.000 description 4
- 239000002270 dispersing agent Substances 0.000 description 4
- 239000004411 aluminium Substances 0.000 description 3
- 238000000713 high-energy ball milling Methods 0.000 description 3
- 238000007731 hot pressing Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000003917 TEM image Methods 0.000 description 2
- 238000000724 energy-dispersive X-ray spectrum Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 235000019441 ethanol Nutrition 0.000 description 2
- 229910021392 nanocarbon Inorganic materials 0.000 description 2
- 239000002243 precursor Substances 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 229910001008 7075 aluminium alloy Inorganic materials 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 238000001513 hot isostatic pressing Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- -1 magnesium nitride Chemical class 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 239000002114 nanocomposite Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003466 welding 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
- C22C21/00—Alloys based on aluminium
-
- 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
- B22F1/12—Metallic powder containing non-metallic particles
-
- 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
- B22F3/12—Both compacting and sintering
- B22F3/14—Both compacting and sintering simultaneously
- B22F3/15—Hot isostatic pressing
-
- 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
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/05—Mixtures of metal powder with non-metallic powder
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention discloses a high temperature resistant super-structure aluminum alloy and a preparation method thereof, wherein the preparation process is as follows: weighing a certain amount of aluminum powder or aluminum alloy powder, adding a certain amount of boehmite and a process control agent, fully mixing the three, and performing ball milling; filling the obtained composite powder into a special die, cold-pressing and molding, and then performing pressure sintering; cooling along with a furnace after sintering is completed to obtain the required super-structure aluminum alloy; the prepared high temperature resistant super-structured aluminum alloy contains in-situ generated nano Al-O amorphous structure and nano Al-O solid solution structure, and precipitated needle-shaped nano Al 2 O 3 Structure is as follows. The invention is thatThe dispersion of a large number of oxygen atoms in the aluminum alloy powder is realized, and the uniform dispersion distribution of the high-density nano reinforced phase is realized; multiple strengthening phases are formed in the aluminum alloy, so that a better synergistic strengthening effect is achieved; the high-temperature strength is greatly improved, and the service temperature can exceed 350 ℃.
Description
Technical Field
The invention belongs to the field of high-performance aluminum alloy materials, and particularly relates to a high-temperature-resistant super-structure aluminum alloy and a preparation method thereof.
Background
With the development of advanced technology, higher and higher requirements are put on high-temperature-resistant light metal materials. The traditional heat-resistant aluminum alloy cannot meet the actual requirements of industrial application due to insufficient high-temperature strength. The high temperature resistant aluminum alloy developed at present mainly improves the high temperature performance of the material by adding rare earth elements to form a high temperature resistant precipitated phase, has high raw material cost and complex heat treatment process, and limits the industrial application of the high temperature resistant aluminum alloy. And the precipitated phase containing rare earth elements has the problem of insufficient high-temperature stability at the temperature of more than 350 ℃, so that the service temperature of the high-temperature resistant aluminum alloy is difficult to exceed 350 ℃. The ceramic material has high melting point and excellent high-temperature mechanical property, and is an ideal strengthening phase for improving the high-temperature mechanical property of the aluminum alloy.
The traditional technology generally adopts micro-or nano-SiC, B 4 C、Al 2 O 3 The ceramic phases such as carbon nano tubes and graphene are added into an aluminum alloy melt in a stirring manner or ceramic powder and aluminum alloy powder are mixed in a powder metallurgy manner to prepare the aluminum-based composite material, so that certain high-temperature mechanical properties are obtained. However, the aluminum-based composite material prepared by the external method has poor plastic toughness and difficult processing due to easy agglomeration of particles, and the service temperature is limited by an aluminum alloy matrix, so that the higher service temperature is difficult to reach.
In recent years, a great deal of research effort has attempted to use in situ generated particulate TiB 2 、TiC、Ti 3 AlC 2 、Al 4 C 3 AlN and Al 2 O 3 And the ceramic phase is used for strengthening the aluminum alloy and improving the high-temperature performance of the aluminum alloy. For example, the invention patent 'a preparation method of a multi-element nano composite reinforced heat-resistant aluminum-based composite material' discloses a method for converting a precursor in precursor coated nano carbon into nano oxide through thermal reaction treatment, so as to obtain the nano carbon and nano oxide composite reinforced heat-resistant aluminum-based composite material. Invention patent' nano AlN particle reinforced mixed crystal heat-resistant aluminium-based composite material and preparation thereofThe preparation method discloses a heat-resistant aluminum-based composite material with endogenous AlN nano reinforced particles, which is prepared by adopting magnesium nitride and aluminum as raw materials and performing in-situ replacement reaction in sintering treatment. The ceramic phase generated in situ is generated by the chemical reaction of the externally added raw materials and the aluminum alloy powder on the surface, is mainly granular, occupies a relatively low volume fraction in the composite material, and has a majority of grain boundary positions, and insufficient blocking effect on the intragranular plastic deformation of the aluminum alloy matrix.
Disclosure of Invention
In order to overcome the problem of insufficient high-temperature strength of the existing aluminum alloy material, the invention provides a high-temperature-resistant super-structure aluminum alloy and a preparation method thereof.
The invention discloses a preparation method of a high-temperature-resistant super-structure aluminum alloy, which comprises the following steps:
step 1: weighing a certain amount of aluminum powder or aluminum alloy powder, adding a certain amount of boehmite and a process control agent, fully mixing the three, and performing ball milling.
Step 2: filling the composite powder obtained in the step 1 into a special die, cold-pressing and molding, and then performing pressure sintering; cooling along with a furnace after sintering is completed to obtain the required super-structure aluminum alloy; when in pressure sintering, the sintering temperature is 580-660 ℃, unidirectional load of 10-300 MPa is applied simultaneously in the sintering process, and the heat preservation time is 15-120min.
Further, the ball milling adopts a planetary ball milling, an omnibearing ball milling, a stirring ball milling or a shimmy ball milling mode to enable boehmite and aluminum powder or aluminum alloy powder to fully react, and oxygen atoms in the boehmite are dissolved into the aluminum powder or the aluminum alloy powder.
Further, in the step 1, the ratio of the mass of boehmite to the mass of aluminum powder or aluminum alloy powder is 0.5-20: 100.
further, in the step 1, the process control agent is one or more of methanol, ethanol, isopropanol, tertiary butanol, ethylene glycol, stearic acid or glycerin, and the mass fraction of the added process control agent is less than 5%.
Further, vacuum, airtight air or argon atmosphere is adopted in the ball milling process in the step 1 to prevent excessive oxidation of the surface of aluminum powder or aluminum alloy powder.
The high-temperature resistant super-structure aluminum alloy prepared by the preparation method of the high-temperature resistant super-structure aluminum alloy contains in-situ generated nano Al-O amorphous structure and nano Al-O solid solution structure, and precipitated needle-shaped nano Al 2 O 3 Structure is as follows.
Further, in-situ generated nano Al-O amorphous structure, nano Al-O solid solution structure and needle-like nano Al 2 O 3 The structure is uniformly distributed in the matrix crystal grain or the crystal boundary, and can also be positioned in two crystal grains at the same time.
Further, in-situ generated nano Al-O amorphous structure, nano Al-O solid solution structure and needle-like nano Al 2 O 3 The structure has excellent high-temperature stability, and can still keep stable after long-time 600 ℃ high-temperature heat treatment.
The beneficial technical effects of the invention are as follows:
(1) The invention takes the boehmite in solid state as an oxygen source, and can better realize the dispersion of a large number of oxygen atoms in the aluminum alloy powder.
(2) The invention makes oxygen atoms solid-dissolved into aluminum alloy in non-equilibrium state through high-energy ball milling, then forms nano amorphous structure and solid-solution structure in subsequent pressure sintering process, and part of the nano amorphous structure and solid-solution structure can be evenly separated out from aluminum alloy to form nano needle-shaped Al 2 O 3 The structure realizes the uniform dispersion distribution of the high-density nano reinforced phase.
(3) The invention forms a nano Al-O amorphous structure, a nano Al-O solid solution structure and a nano needle-shaped Al in the aluminum alloy 2 O 3 The structure and other strengthening phases have better synergistic strengthening effect.
4) The invention forms a nanometer Al-O amorphous structure, a nanometer Al-O solid solution structure and a nanometer needle-shaped Al 2 O 3 The structure greatly improves the high-temperature strength of the aluminum-based composite material, and the service temperature can exceed 350 ℃.
Drawings
FIG. 1 is a TEM image of a high temperature resistant super-structured aluminum alloy material prepared in example 1 of the present invention (wherein a is nanoThe nanometer Al-O amorphous structure, b is a nanometer Al-O solid solution structure, c is nanometer needle-shaped Al 2 O 3 Structure).
Fig. 2 is an EDS spectrum of the high temperature resistant super-structured aluminum alloy material prepared in example 1 of the present invention.
Fig. 3 shows the results of testing the quasi-static compression mechanical properties of the high temperature resistant super-structured aluminum alloy material prepared in example 1 of the present invention at different temperatures.
Detailed Description
The invention will now be described in further detail with reference to the drawings and to specific examples.
The invention discloses a preparation method of a high-temperature-resistant super-structure aluminum alloy, which comprises the following steps:
step 1: weighing aluminum powder or industrial aluminum alloy powder, adding a certain amount of boehmite and a ball milling process control agent, and performing ball milling;
pure aluminum powder or industrial aluminum alloy powder is selected as a raw material, and the particle size and shape of the pure aluminum powder or industrial aluminum alloy powder are not limited.
Adding the weighed pure aluminum powder or industrial aluminum alloy powder and boehmite into a ball milling tank, and adding a process control agent with the mass fraction of 1-5%, wherein the process control agent can be methanol, ethanol, isopropanol, tertiary butanol, ethylene glycol, stearic acid and glycerin, and the process control agent can inhibit cold welding among metal powder during the ball milling process, so that the grain refinement is facilitated. Boehmite is used as an O element source to react with aluminum in situ to generate a strengthening phase of an Al-O structure.
The ball milling tank is protected by airtight air or argon gas atmosphere. The ball milling adopts high-energy ball milling modes such as planetary ball milling, omnibearing ball milling, stirring ball milling or shimmy ball milling, the ball milling time is 5-50 h, the ball-material ratio is 5-50:1, the rotating speed is 100-500 rpm, and the process control agent and the boehmite can be uniformly dispersed on the surface of the thinned powder.
Step 2: cold press molding the mixed powder after ball milling in the step 1, and then performing pressure sintering; and cooling along with the furnace after sintering is completed to obtain the required aluminum-based composite material.
Pressure sintering at 580-640 deg.c and load of 10-300 MPa for 15-120min.
Sintering is carried out by adopting a vacuum hot-pressing sintering furnace, a hot isostatic pressing sintering furnace or an oscillating pressure sintering furnace.
In-situ generated nano Al-O amorphous structure, nano Al-O solid solution structure and needle-like nano Al 2 O 3 The structure is evenly distributed in the matrix material, and the structure can be kept stable after long-time 600 ℃ high-temperature heat treatment.
The prepared high-temperature-resistant super-structured aluminum alloy material has excellent high-temperature mechanical properties, and the service temperature can exceed 350 ℃.
Example 1:
the high temperature resistant super-structure aluminum alloy is prepared according to the following steps:
step 1: aluminum powder with the purity of 99.9% is selected as a raw material, the raw material is filled into a ball milling tank under the protection of an argon atmosphere in a glove box, absolute ethyl alcohol with the mass fraction of 5% is added as a dispersing agent, and boehmite with the mass fraction of 5% is added as an O source. Ball milling the mixture on a planetary ball mill for 30 hours at the rotating speed of 210rpm and the ball-to-material ratio of 25:1, so that the mixture is uniformly dispersed on the surface of the thinned aluminum powder and is subjected to solid solution.
Step 2: and (3) filling the composite powder obtained in the step (1) into a die, cold-pressing and molding, then sintering the sample in a vacuum hot-pressing sintering furnace at 620 ℃, keeping the temperature for 30min under the load of 50MPa, and cooling to room temperature along with the furnace to obtain the sample.
Fig. 1 is a TEM image of the sample of this example. As can be seen from FIG. 1, the high temperature resistant super-structure aluminum alloy composite material prepared by the invention contains various strengthening phases, and comprises a nano Al-O amorphous structure, a nano Al-O solid solution structure and needle-shaped nano Al 2 O 3 Structure is as follows.
Fig. 2 is an EDS spectrum of a high temperature resistant super-structured aluminum alloy composite material prepared by an embodiment of the present invention. From FIG. 2, it can be seen that the O element is enriched in a local region, and is combined with a nano Al-O amorphous structure, a nano Al-O solid solution structure and acicular nano Al 2 O 3 The shape and the size of the structure are consistent.
FIG. 3 shows the results of testing the quasi-static mechanical properties of the high temperature resistant super-structured aluminum alloy composite material prepared by the embodiment of the invention at different temperatures. It can be seen from fig. 3 that the introduction of O element into the aluminum matrix by boehmite not only brings the room temperature strength of the aluminum matrix composite to 600MPa, but also the material still has a high temperature strength of 200MPa at 500 ℃.
Example 2
The high temperature resistant super-structure aluminum alloy is prepared according to the following steps:
step 1: aluminum powder with the purity of 99.9% is selected as a raw material, the raw material is filled into a ball milling tank under the protection of an argon atmosphere in a glove box, and stearic acid with the mass fraction of 1.5% is added as a dispersing agent; 10% by mass of boehmite. Ball milling the mixture on a planetary ball mill for 40 hours at the rotating speed of 280rpm and the ball-material ratio of 15:1, so that the mixture is uniformly dispersed on the surface of the thinned aluminum powder and is subjected to solid solution.
Step 2: and (3) filling the composite powder obtained in the step (1) into a die, cold press molding, sintering in an oscillating sintering furnace at 620 ℃, maintaining the temperature for 30min under the oscillating pressure of 50+/-10 MPa, and cooling to room temperature along with the furnace to obtain the sample.
Example 3
The high temperature resistant super-structure aluminum alloy is prepared according to the following steps:
step 1: the method comprises the steps of selecting ZL114A aluminum alloy powder as a raw material, filling the powder into a ball milling tank under the protection of an argon atmosphere in a glove box, and adding 5% by mass of absolute ethyl alcohol as a dispersing agent; boehmite in 2% by mass was used as O source. Ball milling the mixture on a planetary ball mill for 30 hours at the rotating speed of 240rpm and the ball-material ratio of 20:1, so that the mixture is uniformly dispersed on the surface of the refined aluminum alloy powder and is subjected to solid solution.
Step 2: and (3) filling the composite powder obtained in the step (1) into a die, performing cold press molding, sintering in an oscillating sintering furnace at a sintering temperature of 580 ℃ and a loading pressure of 50MPa, preserving heat for 30min, and cooling to room temperature along with the furnace to obtain a sample.
Example 4
The high temperature resistant super-structure aluminum alloy is prepared according to the following steps:
step 1: 7075 aluminum alloy powder is selected as a raw material, and is filled into a ball milling tank under the protection of argon atmosphere in a glove box, and stearic acid with mass fraction of 1.5% is added as a dispersing agent; boehmite in 2% by mass was used as O source. Ball milling the mixture on a planetary ball mill for 30 hours at the rotating speed of 180rpm and the ball-material ratio of 25:1, so that the mixture is uniformly dispersed on the surface of the refined aluminum alloy powder and is subjected to solid solution.
Step 2: and (3) filling the composite powder obtained in the step (1) into a die, performing cold press molding, sintering in a vacuum hot press sintering furnace at a sintering temperature of 580 ℃, under a load of 30MPa, preserving heat for 30min, and cooling to room temperature along with the furnace to obtain a sample.
The high-temperature strength of the high-temperature resistant super-structure aluminum alloy composite material prepared by the embodiment of the invention is greatly improved through testing, and the service temperature can exceed 350 ℃.
Unlike the traditional in-situ growth process, the present invention combines high energy ball milling and hot pressing sintering to form solid solution of oxygen atom via the reaction of boehmite and aluminum matrix rather than direct reaction to form Al 2 O 3 The particles are sintered to obtain in-situ generated nano Al-O amorphous structure, nano Al-O solid solution structure and needle-shaped nano Al 2 O 3 Structure is as follows. They are dispersed in the aluminium matrix, and form good interface combination, and the strength of aluminium-based composite material at high temperature can be greatly raised by the synergistic strengthening of several strengthening phases.
Claims (8)
1. The preparation method of the high-temperature-resistant super-structure aluminum alloy is characterized by comprising the following steps of:
step 1: weighing a certain amount of aluminum powder or aluminum alloy powder, adding a certain amount of boehmite and a process control agent, fully mixing the three, and performing ball milling;
step 2: filling the composite powder obtained in the step 1 into a special die, cold-pressing and molding, and then performing pressure sintering; cooling along with a furnace after sintering is completed to obtain the required super-structure aluminum alloy; when in pressure sintering, the sintering temperature is 580-660 ℃, unidirectional load of 10-300 MPa is applied simultaneously in the sintering process, and the heat preservation time is 15-120min.
2. The method for preparing the high-temperature resistant super-structured aluminum alloy according to claim 1, wherein the ball milling adopts a planetary ball milling, an omnibearing ball milling, a stirring ball milling or a shimmy ball milling mode.
3. The method for preparing the high-temperature resistant super-structured aluminum alloy according to claim 1, wherein the ratio of the mass of boehmite to the mass of aluminum powder or aluminum alloy powder in the step 1 is 0.5-20: 100.
4. the method for preparing the high-temperature-resistant super-structured aluminum alloy according to claim 1, wherein the process control agent in the step 1 is one or more of methanol, ethanol, isopropanol, tertiary butanol, ethylene glycol, stearic acid or glycerin, and the mass fraction of the added process control agent is less than 5%.
5. The method for preparing the high-temperature resistant super-structured aluminum alloy according to claim 1, wherein the ball milling process in the step 1 adopts vacuum, airtight air or argon atmosphere for protection.
6. The high temperature resistant super-structured aluminum alloy prepared by the preparation method of the high temperature resistant super-structured aluminum alloy as claimed in any one of claims 1 to 5, wherein the high temperature resistant super-structured aluminum alloy contains in-situ generated nano Al-O amorphous structures and nano Al-O solid solution structures, and precipitated needle-shaped nano Al 2 O 3 Structure is as follows.
7. The high temperature resistant super-structured aluminum alloy as recited in claim 6, wherein said in-situ generated nano Al-O amorphous structure, nano Al-O solid solution structure and acicular nano Al 2 O 3 The structure is uniformly distributed in the matrix crystal grain or the crystal boundary, and can also be positioned in two crystal grains at the same time.
8. The high temperature resistant super-structured aluminum alloy as recited in claim 6, wherein said in-situ generated nano Al-O amorphous structure, nano Al-O solid solution structure and acicular nano Al 2 O 3 The structure has excellent high-temperature stability, and can still keep stable after long-time 600 ℃ high-temperature heat treatment.
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