CN115255359A - Ti in a net-layer structure2AlC/TiAl composite material and preparation method thereof - Google Patents
Ti in a net-layer structure2AlC/TiAl composite material and preparation method thereof Download PDFInfo
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- 229910010038 TiAl Inorganic materials 0.000 title claims abstract description 77
- 239000002131 composite material Substances 0.000 title claims abstract description 76
- 238000002360 preparation method Methods 0.000 title claims abstract description 24
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000011159 matrix material Substances 0.000 claims abstract description 39
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 37
- 239000002135 nanosheet Substances 0.000 claims abstract description 33
- 239000000843 powder Substances 0.000 claims abstract description 31
- 238000010438 heat treatment Methods 0.000 claims abstract description 29
- 239000010410 layer Substances 0.000 claims abstract description 26
- 239000002356 single layer Substances 0.000 claims abstract description 26
- 229910006281 γ-TiAl Inorganic materials 0.000 claims abstract description 25
- 238000000498 ball milling Methods 0.000 claims abstract description 23
- 238000005245 sintering Methods 0.000 claims abstract description 9
- 238000002490 spark plasma sintering Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 15
- 239000013078 crystal Substances 0.000 claims description 12
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 8
- 238000005516 engineering process Methods 0.000 claims description 8
- 239000011261 inert gas Substances 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 7
- 238000011065 in-situ storage Methods 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 230000003014 reinforcing effect Effects 0.000 claims description 5
- 229910021325 alpha 2-Ti3Al Inorganic materials 0.000 claims description 4
- 239000002270 dispersing agent Substances 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 238000009689 gas atomisation Methods 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 238000001291 vacuum drying Methods 0.000 claims description 4
- 229910021330 Ti3Al Inorganic materials 0.000 claims description 3
- 238000000889 atomisation Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims description 3
- 238000004807 desolvation Methods 0.000 claims description 3
- 238000001556 precipitation Methods 0.000 claims description 3
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- 239000000758 substrate Substances 0.000 description 4
- 230000007774 longterm Effects 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 2
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- 238000002441 X-ray diffraction Methods 0.000 description 1
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Abstract
The invention discloses Ti in a net-layer structure2The AlC/TiAl composite material and the preparation method thereof are as follows: adding Ti-48Al-2Cr-2Nb prealloyed spherical powder and single-layer graphene nanosheets into a ball milling tank for low-energyBall milling to obtain single-layer graphene nanosheet-coated TiAl composite powder, and performing discharge plasma sintering on the TiAl composite powder to obtain Ti2A composite block of AlC/TiAl and then Ti2Placing the AlC/TiAl composite block body in a vacuum heat treatment furnace for heat treatment to obtain the Ti with a net-lamellar two-stage structure2AlC/TiAl composite material. The invention adopts spark plasma sintering to regulate and control primary mesh Ti2The AlC structure overcomes the softening of grain boundary; then regulating and controlling alpha by adopting heat treatment2‑Ti3Alpha of Al/gamma-TiAl lamellar matrix organization2‑Ti3Nano lamellar Ti introduced at phase boundary of Al/gamma-TiAl lamellar matrix in targeting manner2AlC, in which nanosheets Ti2AlC can inhibit alpha2‑Ti3The Al/gamma-TiAl lamellar matrix has the defects of coarseness and insufficient thermal stability, and the preparation of the composite material further widens the high-temperature application field of the TiAl-based composite material.
Description
Technical Field
The invention relates to the technical field of TiAl composite materials, in particular to Ti with a net-layer structure2AlC/TiAl composite material and a preparation method thereof.
Background
TiAl alloy is an important candidate material for aerospace light high-temperature structures due to excellent high specific strength, good oxidation resistance and creep resistance. The stability of the TiAl alloy structure under high-temperature long-term service conditions and the structure evolution have important influence on the high-temperature mechanical property, so that the thermal stability of the TiAl alloy structure and the high-temperature property are widely concerned. At present, tiAl alloy has the defects of insufficient high-temperature strength, poor thermal stability and the like at the temperature of over 800 ℃, so that the wide application of the TiAl alloy in the engineering field is limited.
Research shows that the microstructure of the TiAl alloy is obviously changed under the condition of high-temperature long-term thermal exposure, and continuous coarsening, discontinuous coarsening or equiaxed grain formation of a lamellar structure can be caused. The fine fully lamellar structure of the TiAl alloy has higher strength, fracture toughness and excellent creep resistance, and the structural stability of the TiAl alloy under the high-temperature condition directly influences the high-temperature mechanical property of the alloy, so that whether the TiAl alloy can be in service in a high-temperature environment for a long time or not is determined. The lamellar structure is easy to generate discontinuous coarsening of crystal boundary, softening of the crystal boundary, continuous coarsening, degradation or decomposition of the lamellar structure in the crystal and dynamic recrystallization process under the action of high temperature and stress, which all lead to the reduction of the high-temperature performance.
The main reasons for the insufficient high-temperature strength and poor thermal stability of the TiAl alloy are grain boundary softening and coarsening of the matrix sheet structure under high-temperature conditions. Researchers at home and abroad successfully prepare various second phases to strengthen the TiAl matrix alloy mainly by using a composite technology. In recent years, the MAX phase of ternary layered compounds has been studied intensively, among which Ti2AlC is one of MAX phase family members, and has excellent electric conduction, heat conduction, thermal shock resistance and the like as metal; but also has the same properties of high melting point, high strength, thermal stability and the like as ceramic materials; the thermal expansion coefficient and the density of the alloy are well matched with TiAl alloy; in-situ formation of Ti in TiAl matrices2The AlC reinforcing phase is expected to become a composite material integrating high strength and thermal stability.
Disclosure of Invention
To solve the disadvantages of the prior art, the present invention provides Ti in a mesh-layer structure2The composite material prepared by the preparation method can effectively improve the service temperature and the high-temperature strength of the TiAl alloy.
In order to achieve the purpose, the invention adopts the specific scheme that:
ti in a net-layer structure2The preparation method of the AlC/TiAl composite material mainly comprises the following steps:
1. adding Ti-48Al-2Cr-2Nb prealloyed spherical powder and a single-layer graphene nanosheet into a ball milling tank, adding absolute ethyl alcohol, and carrying out low-energy ball milling under the protection of inert gas to obtain single-layer graphene nanosheet-coated TiAl composite powder, wherein the nominal component of the composite powder is Ti-48Al-2Cr-2Nb-2.5C (at%);
2. placing the single-layer graphene nanosheet-coated TiAl composite powder obtained in the first step into a graphite die, and sintering by discharge plasma to obtain Ti with reinforcing phases in a net-shaped distribution2An AlC/TiAl composite block;
3. ti obtained in the second step2Placing the AlC/TiAl composite block in a vacuum heat treatment furnace for heat treatment, and cooling the AlC/TiAl composite block to room temperature along with the furnace to obtain the Ti with a net-lamellar two-stage structure2AlC/TiAl composite material.
Further, the preparation method of the single-layer graphene nanosheet selected in the first step comprises the following steps:
(1) Adding the graphene nanosheets into an organic dispersing agent, and uniformly dispersing by ultrasonic to obtain a graphene solution which is dispersed in a single layer and free of agglomeration;
(2) And drying the graphene solution in a vacuum drying oven at the temperature of 60-100 ℃ for 2.5-3.5 h to obtain the single-layer graphene nanosheet.
Furthermore, the thickness of the graphene nano sheet selected in the step (1) is 3-10 nm, and the sheet diameter is 5-10 μm.
Furthermore, the Ti-48Al-2Cr-2Nb prealloyed spherical powder selected in the first step is prepared by inert gas atomization technology or plasma rotating electrode atomization technology, the purity of the powder is 99.99%, and the average grain diameter of the powder is 150-180 mu m.
Furthermore, in the first step, the low-energy ball milling adopts a stirring ball mill, zirconia balls are used as a ball milling medium, the diameter of each ball is 5mm, and the ball-to-material ratio is 20:1, the ball milling speed is 100-120 r/min, and the ball milling time is 8-10 h.
Further, in the second step, the specific parameters of the spark plasma sintering process are as follows: heating to 1200 deg.C at a heating rate of 100 deg.C/min and maintaining for 10min, sintering under 45MPa and vacuum degree of 2.5 × 10-2～2.1×10-1Pa。
Further, in the third step, the vacuum degree is 3.2X 10-2～1.5×10-1Pa, heat treatment temperature of 138The temperature is 0-1400 ℃, and the heat preservation time is 1h.
Ti in a net-layer structure2The AlC/TiAl composite material is obtained by the preparation method.
Further, the Ti2The AlC/TiAl composite material is in a two-stage structure of a net-layer structure: in-situ construction of primary mesh Ti at crystal boundary of matrix by spark plasma sintering process2AlC structure at alpha by vacuum heat treatment process2-Ti3Desolvation precipitation of nano lamellar Ti at phase boundary of Al/gamma-TiAl lamellar matrix2AlC，α2-Ti3Al/gamma-TiAl lamellar substrate and nano lamellar Ti2The AlC together forms a two-level lamellar structure.
Further, primary mesh Ti2The average grid size of the AlC structure is 100-180 mu m; at α2-Ti3In the Al/gamma-TiAl lamellar matrix, the average size of lamellar crystal clusters is about 150 mu m, the average lamellar spacing is 150-200 nm, and nano lamellar Ti2The thickness of AlC is 2-5 nm.
In-situ autogenous Ti is introduced into the grain boundary of the matrix in the invention2The AlC reticular reinforced phase overcomes the softening of a crystal boundary under a high-temperature condition; because the fine fully lamellar structure in the TiAl matrix has better high-temperature performance, the matrix structure of the composite material is regulated and controlled to be alpha through heat treatment2-Ti3Al/gamma-TiAl lamellar structure, and simultaneously utilizes the solid solution and desolvation precipitation principle to perform alpha2-Ti3Target introduction of nano lamellar Ti at phase boundary of Al/gamma-TiAl lamellar matrix2AlC can effectively inhibit the coarsening of the lamellar of the TiAl-based composite material, reduce the interval of the lamellar and improve the thermal stability of the lamellar structure. The nano-sheet layer Ti2The AlC also has an obvious effect on pinning dislocation in a matrix structure and on a matrix interface, and can obviously improve the high-temperature strength of the TiAl matrix.
Has the advantages that:
according to the invention, graphene nanosheets are uniformly coated on the surface of the Ti-48Al-2Cr-2Nb prealloyed spherical powder by a low-energy ball milling process, and a primary mesh Ti is regulated and controlled by adopting a discharge plasma sintering process2The AlC structure overcomes the softening of grain boundary; followed by heat treatmentBy means of regulating alpha2-Ti3Al/gamma-TiAl lamellar matrix structure in alpha2-Ti3Nano lamellar Ti introduced at phase boundary of Al/gamma-TiAl lamellar matrix in targeting manner2AlC, in which nanosheets Ti2AlC can inhibit alpha2-Ti3The Al/gamma-TiAl lamellar matrix substrate has the defects of coarseness and insufficient thermal stability.
Drawings
FIG. 1 is a schematic flow chart of the preparation process of the invention.
FIG. 2 is a schematic diagram of the preparation process of the present invention.
FIG. 3 is an XRD pattern of the sintered compact prepared in step four and the composite material prepared in step five of example 2.
FIG. 4 is a microstructure view of a sintered compact prepared by the fourth step in example 2.
FIG. 5 is a microstructure diagram of a composite material prepared in step five of example 2.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to specific embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, belong to the scope of the present invention.
It should be noted that the meaning of "network-layer structure" and "network-sheet two-stage structure" in the present invention are the same, and both mean that the composite material has a primary network structure and a secondary layer structure.
Ti in a net-layer structure2Referring to fig. 1 and 2, the preparation method of the AlC/TiAl composite material mainly includes the following steps:
1. adding graphene nanosheets with the thickness of 3-10 nm and the flake diameter of 5-10 microns into an organic dispersing agent (such as absolute ethyl alcohol and acetone), and ultrasonically dispersing for 1-2 h under the condition that the ultrasonic power is 200W to obtain a graphene solution with single-layer dispersion and no agglomeration; placing the graphene solution in a vacuum drying oven, and drying at the temperature of 60-100 ℃ for 2.5-3.5 h to obtain a single-layer graphene nanosheet;
2. preparing Ti-48Al-2Cr-2Nb prealloyed spherical powder by an inert gas atomization technology or a plasma rotating electrode atomization technology, wherein the purity of the prepared Ti-48Al-2Cr-2Nb prealloyed spherical powder is 99.99%, and the average grain diameter is 150-180 mu m;
3. adding Ti-48Al-2Cr-2Nb prealloyed spherical powder and single-layer graphene nanosheets into a ball milling tank, adding absolute ethyl alcohol, carrying out low-energy ball milling under the protection of inert gas, carrying out low-energy ball milling by adopting a stirring ball mill, taking zirconia balls as ball milling media, wherein the ball diameter is 5mm, and the ball-to-material ratio is 20:1, ball milling at a rotating speed of 100-120 r/min for 8-10 h to obtain single-layer graphene nanosheet-coated TiAl composite powder, wherein the nominal component of the composite powder is Ti-48Al-2Cr-2Nb-2.5C (at%);
4. placing the single-layer graphene nanosheet-coated TiAl composite powder obtained in the third step into a graphite mold, performing spark plasma sintering, heating to 1200 ℃ at a heating rate of 100 ℃/min, and keeping the temperature for 10min, wherein the sintering pressure is 45MPa, and the vacuum degree is 2.5 multiplied by 10-2～2.1×10-1Pa to obtain Ti2The AlC/TiAl composite block has an equiaxial gamma structure as a substrate;
5. ti obtained in the fourth step2Placing the AlC/TiAl composite block in a vacuum heat treatment furnace for heat treatment, wherein the heat treatment temperature is 1380-1400 ℃, the heat preservation time is 1h, and the vacuum degree is 3.2 x 10 < -2 > to 1.5 x 10 < -1 > Pa, thus obtaining the Ti with the mesh-lamella two-stage structure2The AlC/TiAl composite material has matrix structure with the equiaxed near-gamma structure to form fine fully lamellar structure in alpha2-Ti3Precipitating nano lamellar Ti at the phase boundary of Al/gamma-TiAl lamellar matrix2AlC。
Ti produced by the above method2The AlC/TiAl composite material is in a two-stage structure of a net-layer structure: in-situ construction of primary mesh Ti at crystal boundary of matrix by spark plasma sintering process2AlC structure, alpha is generated by vacuum heat treatment process2-Ti3Al/gamma-TiAl lamellar matrix and in alpha2-Ti3Desolventizing and precipitating sodium at phase boundary of Al/gamma-TiAl lamellar substrateRice sheet layer Ti2AlC，α2-Ti3Al/gamma-TiAl lamellar matrix and nano lamellar Ti2The alcs together form a secondary lamellar structure.
Wherein, primary network Ti2The average grid size of the AlC structure is 100-180 mu m; at alpha2-Ti3In the Al/gamma-TiAl lamellar matrix, the average size of lamellar crystal clusters is about 150 mu m, the average lamellar spacing is 150-200 nm, and nano lamellar Ti2The thickness of AlC is 2-5 nm.
The Ti-48Al-2Cr-2Nb prealloyed powder contains a Cr element and a Nb element which can effectively improve the mechanical property of the alloy besides a Ti element and an Al element, and the Cr element and the Nb element do not influence the design and the preparation of the Ti2AlC/TiAl composite material with a net-sheet two-stage structure.
Example 1
Ti in a net-layer structure2The preparation method of the AlC/TiAl composite material comprises the following specific steps:
1. adding graphene nanosheets with the thickness of 3-10 nm and the flake diameter of 5-10 microns into a dispersing agent, and performing ultrasonic dispersion for 1h under the condition that the ultrasonic power is 200W to obtain a single-layer dispersed and agglomeration-free graphene solution; placing the graphene solution in a vacuum drying oven, and drying at 60 ℃ for 2.5 hours to obtain a single-layer graphene nanosheet;
2. preparing Ti-48Al-2Cr-2Nb prealloyed spherical powder with the purity of 99.99 percent and the average grain diameter of 180 mu m by an inert gas atomization technology,
3. adding 40g of Ti-48Al-2Cr-2Nb prealloyed spherical powder and 0.3g of single-layer graphene nanosheets into a ball milling tank, adding 6ml of absolute ethyl alcohol, carrying out low-energy ball milling by adopting a stirring ball mill under the protection of inert gas, taking zirconia balls as ball milling media, wherein the ball diameter is 5mm, and the ball-to-material ratio is 20:1, ball-milling at a rotation speed of 100r/min for 10h to obtain single-layer graphene nanosheet-coated TiAl composite powder, wherein the nominal component of the single-layer graphene nanosheet-coated TiAl composite powder is Ti-48Al-2Cr-2Nb-2.5C (at%);
4. placing the single-layer graphene nanosheet-coated TiAl composite powder obtained in the third step into a graphite mold, and dischargingAn ion sintering process, heating to 1200 ℃ at a heating rate of 100 ℃/min and keeping the temperature for 10min, wherein the sintering pressure is 45MPa, and the vacuum degree is 2.5 multiplied by 10-2～2.1×10-1Pa to obtain Ti2AlC/TiAl composite blocks; the reinforcing phase in the composite block is distributed in a net shape, and the matrix is an equiaxial gamma tissue;
5. ti obtained in the fourth step2And placing the AlC/TiAl composite block in a vacuum heat treatment furnace for heat treatment, wherein the heat treatment temperature is 1380 ℃, the heat preservation time is 1h, and the vacuum degree is 3.2 x 10 < -2 > to 1.5 x 10 < -1 > Pa, so that the Ti2AlC/TiAl composite material in a net-sheet two-stage structure is obtained. In the composite material, the matrix tissue is changed from an equiaxial near gamma tissue to a near lamellar tissue at alpha2-Ti3Precipitating nano Ti at the phase boundary of Al/gamma-TiAl lamellar matrix2And an AlC laminated structure. Under the condition, the obtained near lamellar tissue contains a small amount of equiaxial gamma-TiAl tissue.
Example 2
The present embodiment differs from embodiment 1 only in that: the adopted heat treatment process temperature is 1400 ℃. As can be seen from FIG. 3, the composite block prepared in step four or the composite material prepared in step five both consist of TiAl, tiAl and TiAl, and the peak intensity of the composite material is reduced compared with that of the composite block. As can be seen from fig. 4, the reinforcing phases in the composite block are distributed in a network shape, and the matrix is an equiaxial gamma tissue; as can be seen from FIG. 5, the matrix structure is an ideal fine whole lamellar structure at α2-Ti3The nano lamellar Ti exists at the phase boundary of the Al/gamma-TiAl lamellar matrix2And (4) AlC. The net-sheet two-stage organization structure has better performance, so that the TiAl composite material has higher service temperature and high temperature strength.
Example 3
The difference between the embodiment and the embodiment 1 is only that the selected Ti-48Al-2Cr-2Nb prealloyed powder has the grain diameter of 150 μm, and can prepare the first-grade in-situ synthesized Ti with smaller size2The AlC net structure enables the lamellar structure of the TiAl substrate to be further refined, and simultaneously improves the barrier effect of crystal boundary to dislocation movement, thereby further improving the high-temperature strength of the composite material.
Comparative example 1
Comparative example 1 differs from example 2 only in that: the adopted heat treatment process temperature is 1420 ℃, compared with the embodiment 2, the alpha 2/gamma lamellar matrix becomes coarse, the high-temperature strength is insufficient, and the performance is poor.
The invention constructs a primary network structure in situ through tissue regulation and control to overcome the crystal boundary softening of the TiAl matrix at high temperature and alpha2-Ti3Two-stage nano lamellar Ti is introduced at the phase boundary of Al/gamma-TiAl lamellar matrix in a targeted manner2AlC enhancement phase suppression of alpha2-Ti3The coarsening of the Al/gamma-TiAl lamellar matrix has important significance for improving the thermal stability of the lamellar structure. The two-stage structure composite material provided by the invention can effectively improve the thermal stability of the TiAl-based alloy structure under the high-temperature long-term service condition and strengthen the high-temperature mechanical property of the alloy, so that the TiAl-based composite material has more excellent high-temperature strength and service temperature. Can be applied to aerospace high-temperature resistant structural components, and further widens the application range of the TiAl-based composite material.
The foregoing is merely a preferred embodiment of the invention and is not to be construed as limiting the invention in any way. All equivalent changes and modifications made according to the spirit of the present invention should be covered in the protection scope of the present invention.
Claims (10)
1. Ti in a net-layer structure2The preparation method of the AlC/TiAl composite material is characterized by mainly comprising the following steps of:
1. adding Ti-48Al-2Cr-2Nb prealloyed spherical powder and a single-layer graphene nanosheet into a ball milling tank, adding absolute ethyl alcohol, and carrying out low-energy ball milling under the protection of inert gas to obtain single-layer graphene nanosheet-coated TiAl composite powder, wherein the nominal component of the single-layer graphene nanosheet-coated TiAl composite powder is Ti-48Al-2Cr-2Nb-2.5C (at%);
2. placing the single-layer graphene nanosheet-coated TiAl composite powder obtained in the step one in a graphite mold, and sintering by using discharge plasma to obtain Ti with reinforcing phases in a net-shaped distribution2An AlC/TiAl composite block;
3. obtained in the second stepTi2Placing the AlC/TiAl composite block body in a vacuum heat treatment furnace for heat treatment, and cooling the AlC/TiAl composite block body to room temperature along with the furnace to obtain the Ti with a net-lamellar two-stage structure2AlC/TiAl composite material.
2. Ti in a mesh-layer structure according to claim 12The preparation method of the AlC/TiAl composite material is characterized in that the preparation method of the single-layer graphene nanosheet selected in the first step is as follows:
(1) Adding the graphene nanosheets into an organic dispersing agent, and uniformly dispersing by ultrasonic to obtain a single-layer dispersed and agglomeration-free graphene solution;
(2) And drying the graphene solution in a vacuum drying oven at the temperature of 60-100 ℃ for 2.5-3.5 h to obtain the single-layer graphene nanosheet.
3. Ti in a mesh-layer structure according to claim 22The preparation method of the AlC/TiAl composite material is characterized by comprising the following steps: the thickness of the graphene nanosheet selected in the step (1) is 3-10 nm, and the diameter of the nanosheet is 5-10 microns.
4. Ti in a mesh-layer structure according to claim 12The preparation method of the AlC/TiAl composite material is characterized by comprising the following steps: the Ti-48Al-2Cr-2Nb prealloyed spherical powder selected in the first step is prepared by inert gas atomization technology or plasma rotating electrode atomization technology, the purity of the powder is 99.99%, and the average grain diameter of the powder is 150-180 mu m.
5. Ti in a mesh-layer structure according to claim 12The preparation method of the AlC/TiAl composite material is characterized by comprising the following steps: in the first step, the low-energy ball milling adopts a stirring ball mill, zirconia balls are used as ball milling media, the diameter of the balls is 5mm, and the ball-material ratio is 20:1, the ball milling speed is 100-120 r/min, and the ball milling time is 8-10 h.
6. Ti in a mesh-layer structure according to claim 12Preparation of AlC/TiAl composite materialThe preparation method is characterized by comprising the following steps: in the second step, the specific parameters of the spark plasma sintering process are as follows: heating to 1200 deg.C at a heating rate of 100 deg.C/min and maintaining for 10min, with a sintering pressure of 45MPa and a vacuum degree of 2.5 × 10-2～2.1×10-1Pa。
7. Ti in a mesh-layer structure according to claim 12The preparation method of the AlC/TiAl composite material is characterized by comprising the following steps: in the third step, the vacuum degree is 3.2 multiplied by 10-2～1.5×10-1Pa, heat treatment temperature of 1380-1400 deg. C, and heat preservation time of 1h.
8. Ti in a net-layer structure2AlC/TiAl composite material, characterized in that it is obtained by the preparation method according to any one of claims 1 to 7.
9. Ti in a mesh-layer structure according to claim 82AlC/TiAl composite material, characterized in that the Ti2The AlC/TiAl composite material is in a two-stage structure of a net layer and a lamellar layer: in-situ construction of primary mesh Ti at crystal boundary of matrix by spark plasma sintering process2AlC structure, alpha is generated by vacuum heat treatment process2-Ti3Al/gamma-TiAl lamellar matrix in alpha2-Ti3Desolvation precipitation of nano lamellar Ti at phase boundary of Al/gamma-TiAl lamellar matrix2AlC，α2-Ti3Al/gamma-TiAl lamellar matrix and nano lamellar Ti2The AlC together forms a two-level lamellar structure.
10. Ti in a mesh-layer structure according to claim 92The AlC/TiAl composite material is characterized in that: primary network Ti2The average grid size of the AlC structure is 100-180 mu m; at α2-Ti3In the Al/gamma-TiAl lamellar matrix, the average size of lamellar crystal clusters is about 150 mu m, the average lamellar spacing is 150-200 nm, and nano lamellar Ti2The thickness of AlC is 2-5 nm.
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