CN116411200A - Preparation method of rare earth oxide reinforced TiAl-based nanocomposite - Google Patents
Preparation method of rare earth oxide reinforced TiAl-based nanocomposite Download PDFInfo
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- CN116411200A CN116411200A CN202211640337.XA CN202211640337A CN116411200A CN 116411200 A CN116411200 A CN 116411200A CN 202211640337 A CN202211640337 A CN 202211640337A CN 116411200 A CN116411200 A CN 116411200A
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- 229910010038 TiAl Inorganic materials 0.000 title claims abstract description 69
- 239000002114 nanocomposite Substances 0.000 title claims abstract description 46
- 229910001404 rare earth metal oxide Inorganic materials 0.000 title claims abstract description 46
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- 239000002131 composite material Substances 0.000 claims abstract description 52
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 44
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 43
- 238000000034 method Methods 0.000 claims abstract description 42
- 238000002844 melting Methods 0.000 claims abstract description 34
- 230000008018 melting Effects 0.000 claims abstract description 34
- 238000010438 heat treatment Methods 0.000 claims abstract description 27
- 239000011159 matrix material Substances 0.000 claims abstract description 22
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 22
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 17
- 238000005266 casting Methods 0.000 claims abstract description 16
- 230000008569 process Effects 0.000 claims abstract description 15
- 239000002994 raw material Substances 0.000 claims abstract description 12
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 claims description 18
- 150000003839 salts Chemical class 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 13
- 229910045601 alloy Inorganic materials 0.000 claims description 12
- 239000000956 alloy Substances 0.000 claims description 12
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical group O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 11
- 229910000420 cerium oxide Inorganic materials 0.000 claims description 10
- 239000002105 nanoparticle Substances 0.000 claims description 10
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 claims description 10
- 238000003723 Smelting Methods 0.000 claims description 8
- 239000000155 melt Substances 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 5
- 229910052731 fluorine Inorganic materials 0.000 claims description 5
- 239000011737 fluorine Substances 0.000 claims description 5
- 229910002804 graphite Inorganic materials 0.000 claims description 5
- 239000010439 graphite Substances 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000010309 melting process Methods 0.000 claims description 2
- 238000007711 solidification Methods 0.000 claims description 2
- 230000008023 solidification Effects 0.000 claims description 2
- 150000002222 fluorine compounds Chemical group 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 230000002776 aggregation Effects 0.000 abstract description 5
- 238000005054 agglomeration Methods 0.000 abstract description 4
- 238000005728 strengthening Methods 0.000 abstract description 4
- 239000006185 dispersion Substances 0.000 abstract description 3
- 229910052719 titanium Inorganic materials 0.000 abstract description 3
- 230000003014 reinforcing effect Effects 0.000 abstract description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 abstract 1
- 239000010936 titanium Substances 0.000 abstract 1
- 239000000919 ceramic Substances 0.000 description 15
- CHBIYWIUHAZZNR-UHFFFAOYSA-N [Y].FOF Chemical compound [Y].FOF CHBIYWIUHAZZNR-UHFFFAOYSA-N 0.000 description 8
- RUDFQVOCFDJEEF-UHFFFAOYSA-N yttrium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 0.000 description 7
- 238000009826 distribution Methods 0.000 description 5
- 239000002243 precursor Substances 0.000 description 5
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010907 mechanical stirring Methods 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- QCCDYNYSHILRDG-UHFFFAOYSA-K cerium(3+);trifluoride Chemical compound [F-].[F-].[F-].[Ce+3] QCCDYNYSHILRDG-UHFFFAOYSA-K 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000004663 powder metallurgy Methods 0.000 description 2
- 238000009827 uniform distribution Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910001257 Nb alloy Inorganic materials 0.000 description 1
- XVVDIUTUQBXOGG-UHFFFAOYSA-N [Ce].FOF Chemical compound [Ce].FOF XVVDIUTUQBXOGG-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 description 1
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010668 complexation reaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- FXOFAYKVTOLJTJ-UHFFFAOYSA-N fluoridooxygen(.) Chemical class F[O] FXOFAYKVTOLJTJ-UHFFFAOYSA-N 0.000 description 1
- 238000000048 melt cooling Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 1
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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
-
- 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
- C22C1/1005—Pretreatment of the non-metallic additives
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C14/00—Alloys based on titanium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/001—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides
- C22C32/0015—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides with only single oxides as main non-metallic constituents
- C22C32/0031—Matrix based on refractory metals, W, Mo, Nb, Hf, Ta, Zr, Ti, V or alloys thereof
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Alloys Or Alloy Compounds (AREA)
Abstract
A preparation method of a rare earth oxide reinforced TiAl-based nanocomposite material belongs to the technical field of preparation of TiAl-based nanocomposite materials. The preparation method of the composite material comprises the following steps: (1) Preparing an aluminum-based intermediate composite material with uniformly distributed strengthening phases (rare earth oxyfluoride); (2) Preparing a TiAl-based rare earth oxide nanocomposite by taking an aluminum-based rare earth oxyfluoride intermediate composite and pure titanium (and other components) as raw materials through vacuum arc melting; (3) The TiAl-based rare earth oxide nanocomposite is subjected to heat treatment to obtain a target tissue (for example, a near-lamellar tissue or a full lamellar tissue), and a large amount of uniformly dispersed nanoscale rare earth oxide strengthening phases are precipitated in the matrix. The method can solve the problems of nanophase agglomeration and uneven dispersion in the process of preparing the TiAl-based rare earth oxide nanocomposite by a casting method, provides a feasible preparation method for reinforcing the TiAl-based composite by the nanoscale rare earth oxide, and has important application value.
Description
Technical Field
The invention belongs to the technical field of preparation of TiAl-based nanocomposite materials, and relates to a method for preparing a TiAl-based nanocomposite material by taking an aluminum-based intermediate composite material as a raw material.
Background
The TiAl alloy is considered as an ideal light high-temperature structural material for producing low-pressure turbine blades due to the advantages of low density, high melting point, high specific strength, high specific modulus, good high-temperature oxidation resistance and the like, and has important application prospect in the aerospace field. Nanoceramic phase complexation has been demonstrated to further enhance the properties of TiAl alloys, e.g., by adding TiC and TiB 2 The mechanical property of the TiAl alloy can be obviously improved. The price of oxides is far lower than that of borides and carbides, and studies have shown that rare earth oxides (e.g., yttria) can significantly improve the mechanical properties of TiAl alloys. Therefore, the rare earth oxide reinforced TiAl-based nanocomposite is a light high-temperature structural material with excellent performance and low preparation cost and development prospect.
The existing preparation methods of the TiAl-based nanocomposite mainly comprise a casting method, a powder metallurgy method, an additive manufacturing method and the like. The powder metallurgy method and the additive manufacturing method can realize uniform distribution of nano ceramic phases, wherein the additive manufacturing method has the optimal effect, but the two methods have high cost and high requirements on equipment and working environment at present, and the difficulty in preparing large-size workpieces is high. Compared with the casting method, the casting method has low cost and is convenient for manufacturing large-size workpieces, and is a more economic nanocomposite preparation method. However, in the process of preparing the TiAl-based nano ceramic phase composite material by adopting a casting method, the wettability between the nano particles and the TiAl melt is generally poor, and the nano particles have large specific surface area and high surface energy, so that the nano particles are unevenly dispersed in the melt. In addition, the nano particles are easy to agglomerate under the action of Van der Waals attraction force to form large-size micron-sized agglomerates, so that the large-size micron-sized agglomerates are difficult to exist in a nano state, and the strengthening effect of the nano ceramic relative to a TiAl matrix is seriously weakened. Thus, the preparation of nano-state ceramic phase reinforced TiAl-based nanocomposite materials by casting has been a major challenge and challenge. Solves the problem of non-uniform agglomeration and distribution of the nano ceramic phase and has important significance for preparing the high-performance nano ceramic phase reinforced TiAl-based composite material with low cost.
Disclosure of Invention
The invention provides a novel preparation method for preparing a TiAl-based rare earth oxide nanocomposite by taking an aluminum-based intermediate composite as a raw material and carrying out subsequent heat treatment, and aims to solve the problems of nanoparticle aggregation and uneven distribution in the process of preparing the TiAl-based nanocomposite by a casting method. The method has simple process, can realize the uniform distribution of the ceramic reinforcing phase in the matrix without high-intensity stirring of the melt, and can realize micro-nano double-scale ceramic phase reinforcement.
A preparation method of a rare earth oxide reinforced TiAl-based nanocomposite is characterized in that an aluminum-based rare earth oxyfluoride intermediate composite is used for replacing pure aluminum and rare earth oxide as raw materials of the TiAl-based rare earth oxide composite, and the rare earth oxyfluoride is uniformly dispersed in the aluminum-based intermediate composite, so that a rare earth oxide reinforced phase in the TiAl-based composite can inherit the good dispersibility; when rare earth oxyfluoride with a lower melting point is prepared by adopting a method of vacuum arc melting with an extremely high melting temperature, the oxyfluoride can be dissolved in a TiAl-based alloy melt, and because the fluoride is usually low in melting point, fluorine elements can be volatilized and removed in the melting process of the composite material, and micron-sized and nano-sized rare earth oxides can be evenly separated out of a matrix in the solidification and subsequent heat treatment processes of the composite material, so that the TiAl-based rare earth oxide nanocomposite is obtained.
The preparation of the TiAl-based rare earth oxide nanocomposite comprises the following steps:
(1) Pure aluminum, fluoride fused salt and nano rare earth oxide are used as raw materials, the pure aluminum is melted in a graphite crucible and heated to a preset melting temperature, then the fused mass is stirred, the fluoride fused salt and the nano rare earth oxide are added into the aluminum fused mass, and casting is carried out after the melting is finished, so that the aluminum-based rare earth oxyfluoride intermediate composite material is obtained.
(2) The aluminum-based rare earth oxyfluoride intermediate composite material, pure Ti and other alloy components are placed in a vacuum arc furnace melting tank for melting, and remelting is carried out for 3-5 times, so as to ensure that the components are uniform.
(3) And carrying out high-temperature heat treatment, furnace cooling or air cooling on the original TiAl-based rare earth oxide composite material obtained by vacuum arc melting.
In the step (1), the preparation process of the aluminum-based rare earth oxyfluoride intermediate composite material is fluoride molten salt auxiliary stirring casting, the preset smelting temperature is higher than the melting points of aluminum and fluoride molten salt, the stirring process aims at homogenizing oxyfluoride in an aluminum melt, and the stirring mode can be realized.
Further, in the step (1), the fluoride molten salt is KAlF 4 The method comprises the steps of carrying out a first treatment on the surface of the The nano rare earth oxide is yttrium oxide and cerium oxide.
Further, in the step (2), the aluminum-based rare earth oxyfluoride intermediate composite material is used as a raw material, wherein the content of oxyfluoride is 0.01wt.% to 0.5wt.%.
Further, in the step (3), the temperature of the heat treatment is 1200-1400 ℃, the time is 5 min-2 h, the furnace cooling or air cooling is carried out, and the specific heat treatment system is different according to the components of the composite material.
The invention provides a novel method for preparing a TiAl-based nanocomposite by taking an aluminum-based intermediate composite as a raw material, which aims to solve the problems of nonuniform phase distribution and large-size agglomeration of nano ceramic in the process of preparing the TiAl-based nanocomposite by a casting method. The solution idea of the invention is as follows:
(1) The ceramic phase is well dispersed in the precursor material first, and thus the good dispersibility of the ceramic phase in the precursor material can be "inherited" by the TiAl-based composite material when the TiAl-based composite material is smelted.
(2) Ti and Al are the two major elements of the TiAl alloy, so Ti-based intermediate composites and Al-based intermediate composites are suitable choices as precursor materials. The Al-based intermediate composite material is a proper precursor material selection due to the characteristics of low melting point, low requirement on equipment, simple preparation process and the like.
(3) Agglomeration of nanoparticles in metal melts is often difficult to avoid, and therefore, in addition to achieving uniform dispersion of ceramic particles in the precursor material, minimizing the size of the ceramic particle agglomerates, further conversion of the agglomerates into a nanosized ceramic phase in the TiAl matrix is required.
(4) "dissolution-precipitation" is an effective refinement mechanism, but because pure rare earth oxides generally have a higher melting point, they are difficult to dissolve or slow to process in the alloy smelting process, so that fluorine modified rare earth oxides are used to form fluorine oxides instead of rare earth oxides as an "intermediate strengthening phase". The melting point of the rare earth oxyfluoride is obviously lower than that of the oxide, and the fluoride is generally lower in melting point and can be volatilized and removed in the high-temperature smelting process of the composite material. In order to facilitate the dissolution of rare earth oxyfluoride and the removal of fluorine, a method with high smelting temperature is preferably adopted to prepare the TiAl-based nanocomposite, and vacuum arc melting is one of them.
In the preparation process of the rare earth oxide reinforced TiAl-based nanocomposite, F can be volatilized and removed in the TiAl alloy smelting process due to the low melting boiling point of fluoride. In the melt cooling process, the melting point of the rare earth oxide is higher than that of the TiAl matrix, so that micron-sized rare earth oxide is formed by precipitation. Because of the rapid cooling effect of the water-cooled copper mold, rare earth elements and oxygen elements are not completely separated out in the cooling process, and a part of rare earth elements and oxygen elements are dissolved in the matrix.
The rare earth elements and oxygen elements dissolved in the matrix precipitate nano-sized rare earth oxides during the subsequent heat treatment and are uniformly distributed in the matrix.
The invention innovatively provides a preparation method of a rare earth oxide reinforced TiAl-based nanocomposite based on the dispersion uniformity of a reinforced phase in a TiAl-based nanocomposite, fluorine modified rare earth oxide and a dissolution-precipitation mechanism. The method is still essentially based on a casting method, can realize micro-nano double-scale rare earth oxide reinforced TiAl alloy, has remarkable advantages in the aspect of preparing high-performance rare earth oxide reinforced TiAl-based nanocomposite materials at low cost, and also provides a borrowable preparation process for other types of ceramic phase reinforced TiAl-based nanocomposite materials.
Drawings
FIG. 1 is a microstructure of an aluminum-based yttrium oxyfluoride intermediate composite and a yttrium oxide-reinforced TiAl-based nanocomposite in example 1 of the present invention. FIG. 1a shows the distribution of yttrium oxyfluoride in an aluminum matrix of an aluminum-based intermediate composite material according to example 1 of the present invention; FIGS. 1b and 1c are microstructure diagrams of an as-cast TiAl-based yttria nanocomposite of example 1 of the invention, with micro-scale yttria uniformly distributed in a matrix; FIG. 1d shows the low-order microscopic structure of the as-cast TiAl-based yttrium oxide nanocomposite of example 1 of the present invention after high temperature heat treatment (1340 ℃ C., 10 min), in a near lamellar structure; FIG. 1e shows the high magnification microstructure of FIG. 1d with nano-scale yttrium oxide uniformly distributed in the matrix.
FIG. 2 is a graph showing the transmission characteristics of a sample of the as-cast TiAl-based yttria nanocomposite of example 1 of the present invention after a high temperature treatment (1340 ℃ C., 10 min). FIG. 2a is a schematic diagram of a matrix of long rod-like micron-sized yttrium oxide; FIGS. 2b and 2c are isometric nanoscale yttrium oxide in a matrix; figures 2d and 2e are interplanar spacings, interplanar angles, and diffraction pattern characteristics of nanoscale yttria at high resolution.
FIG. 3 is a graph showing the microstructure of the sample of example 2 of the present invention after being subjected to high temperature heat treatment (1300 ℃ C., 2 h), wherein the nano yttrium oxide is uniformly distributed in the matrix.
FIG. 4 is a microstructure of an aluminum-based ceria intermediate composite and a ceria-reinforced TiAl-based nanocomposite according to example 3 of the invention. FIG. 4a shows the distribution of cerium oxyfluoride in an aluminum matrix in an aluminum-based intermediate composite material according to example 3 of the present invention; FIGS. 4b and 4c are microstructural views of an as-cast TiAl-based cerium oxide nanocomposite material of example 3 of the present invention, with micron-sized cerium oxide uniformly distributed in the matrix; FIGS. 4d and 4e show the high-order microstructure of the as-cast TiAl-based cerium oxide nanocomposite of example 3 of the present invention after high temperature heat treatment (1380 ℃ C., 30 min), wherein the nano-sized cerium oxide was uniformly distributed in the matrix.
Detailed description of the preferred embodiments
The technical scheme of the invention is further described below by combining examples.
Example 1 TiAl-based yttria nanocomposite
Step 2, preparing a TiAl-based yttrium oxide nanocomposite by using an Al-based yttrium oxyfluoride composite and pure Ti as raw materials through a vacuum arc melting method, remelting for 3-5 times to ensure uniformity of sample components, wherein the matrix components are Ti-45Al (at%);
step 3, placing the sample in a muffle furnace for heat treatment, wherein the heat treatment system is 1340-10 min, and cooling the sample along with the furnace after the heat treatment is finished;
and 4, preparing and detecting the scanning sample and the transmission sample of the sample after the heat treatment.
Example 2 TiAl-based yttria nanocomposite
Step 2, preparing a TiAl-based yttrium oxide nanocomposite by using an Al-based yttrium oxyfluoride composite and pure Ti as raw materials through a vacuum arc melting method, remelting for 3-5 times to ensure uniformity of sample components, wherein the matrix components are Ti-45Al (at%);
step 3, placing the sample in a muffle furnace for heat treatment, wherein the heat treatment system is 1300-2 h, and cooling the sample along with the furnace after the heat treatment is finished;
and 4, preparing and detecting a scanning sample of the sample after the heat treatment.
Example 3 high Nb-TiAl based cerium oxide nanocomposite
Step 2, preparing a high Nb-TiAl-based cerium oxide nanocomposite by taking an Al-based cerium oxide composite, pure Ti and Al-Nb alloy as raw materials through a vacuum arc melting method, and remelting for 3-5 times to ensure the uniformity of sample components, wherein the matrix components are Ti-45Al-8Nb (at%);
step 3, placing the sample in a muffle furnace for heat treatment, wherein the heat treatment system is 1380-30 min, and cooling the sample along with the furnace after the heat treatment is finished;
and 4, preparing and detecting a scanning sample of the sample after the heat treatment.
Although the present invention has been described with reference to the above embodiments by way of illustration and not limitation, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (5)
1. A preparation method of a rare earth oxide reinforced TiAl-based nanocomposite is characterized in that an aluminum-based rare earth oxyfluoride intermediate composite is used for replacing pure aluminum and rare earth oxide as raw materials of the TiAl-based rare earth oxide composite, and the rare earth oxyfluoride is uniformly dispersed in the aluminum-based intermediate composite, so that a rare earth oxide reinforced phase in the TiAl-based composite can inherit the good dispersibility; when rare earth oxyfluoride with a lower melting point is prepared by adopting a method of vacuum arc melting with an extremely high melting temperature, the oxyfluoride can be dissolved in a TiAl-based alloy melt, and because the fluoride is usually low in melting point, fluorine elements can be volatilized and removed in the melting process of the composite material, and micron-sized and nano-sized rare earth oxides can be evenly separated out of a matrix in the solidification and subsequent heat treatment processes of the composite material, so that the TiAl-based rare earth oxide nanocomposite is obtained; the preparation of the TiAl-based rare earth oxide nanocomposite comprises the following steps:
(1) Melting pure aluminum in a graphite crucible, heating to a preset melting temperature, stirring a melt, adding fluoride molten salt and nano rare earth oxide into the aluminum melt, and casting after the melting is finished to obtain an aluminum-based rare earth oxyfluoride intermediate composite material;
(2) Placing the aluminum-based rare earth oxyfluoride intermediate composite material, pure Ti and other alloy components into a vacuum arc furnace smelting tank for smelting, and remelting for 3-5 times to ensure uniform components;
(3) And carrying out high-temperature heat treatment, furnace cooling or air cooling on the original TiAl-based rare earth oxide composite material obtained by vacuum arc melting.
2. The method for preparing the rare earth oxide reinforced TiAl-based nanocomposite according to claim 1, wherein in the step (1), the preparation process of the aluminum-based rare earth oxyfluoride intermediate composite is fluoride molten salt-assisted stirring casting, the preset smelting temperature is higher than the melting points of aluminum and fluoride molten salt, and the stirring process aims at homogenizing oxyfluoride in an aluminum melt, so long as the stirring mode can achieve the purpose.
3. The method for producing a rare earth oxide-reinforced TiAl-based nanocomposite material according to claim 1, wherein in step (1), the fluoride molten salt is KAlF 4 The method comprises the steps of carrying out a first treatment on the surface of the The nano rare earth oxide is yttrium oxide and cerium oxide.
4. The method for preparing the rare earth oxide reinforced TiAl-based nanocomposite material according to claim 1, wherein in the step (2), the aluminum-based rare earth oxyfluoride intermediate composite material is used as a raw material, and the content of oxyfluoride is 0.01wt.% to 0.5wt.%.
5. The method for preparing the rare earth oxide reinforced TiAl-based nanocomposite according to claim 1, wherein in the step (3), the temperature of the heat treatment is 1200-1400 ℃, the time is 5 min-2 h, and the furnace cooling or air cooling is performed, and the specific heat treatment system is different according to the composition of the composite.
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