CN106001566A - High-strength high-entropy alloy NbMoTaWV and preparation method thereof - Google Patents
High-strength high-entropy alloy NbMoTaWV and preparation method thereof Download PDFInfo
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- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 96
- 239000000956 alloy Substances 0.000 title claims abstract description 96
- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- 238000005245 sintering Methods 0.000 claims abstract description 59
- 238000000034 method Methods 0.000 claims abstract description 52
- 239000000463 material Substances 0.000 claims abstract description 32
- 238000005551 mechanical alloying Methods 0.000 claims abstract description 18
- 239000013078 crystal Substances 0.000 claims abstract description 12
- 239000006104 solid solution Substances 0.000 claims abstract description 4
- 239000000843 powder Substances 0.000 claims description 44
- 230000008569 process Effects 0.000 claims description 25
- 238000000498 ball milling Methods 0.000 claims description 16
- 239000011159 matrix material Substances 0.000 claims description 15
- 229910052758 niobium Inorganic materials 0.000 claims description 11
- 229910052715 tantalum Inorganic materials 0.000 claims description 11
- 229910052720 vanadium Inorganic materials 0.000 claims description 11
- 229910052750 molybdenum Inorganic materials 0.000 claims description 10
- 229910052721 tungsten Inorganic materials 0.000 claims description 10
- 238000000713 high-energy ball milling Methods 0.000 claims description 7
- 238000000227 grinding Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 230000014759 maintenance of location Effects 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 238000004064 recycling Methods 0.000 claims description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 2
- 229910052737 gold Inorganic materials 0.000 claims description 2
- 239000010931 gold Substances 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 239000002244 precipitate Substances 0.000 claims description 2
- 238000005266 casting Methods 0.000 abstract description 10
- 238000005516 engineering process Methods 0.000 abstract description 6
- 238000007906 compression Methods 0.000 abstract description 5
- 230000006835 compression Effects 0.000 abstract description 4
- 238000005204 segregation Methods 0.000 abstract description 2
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- 230000003247 decreasing effect Effects 0.000 abstract 1
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- 238000002844 melting Methods 0.000 abstract 1
- 230000008018 melting Effects 0.000 abstract 1
- 238000002490 spark plasma sintering Methods 0.000 abstract 1
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- 230000004927 fusion Effects 0.000 description 8
- 239000000203 mixture Substances 0.000 description 7
- 238000005275 alloying Methods 0.000 description 6
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- 229910052786 argon Inorganic materials 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000003082 abrasive agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
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- 210000001787 dendrite Anatomy 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
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- 238000005272 metallurgy Methods 0.000 description 1
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- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000004663 powder metallurgy Methods 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
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/045—Alloys based on refractory metals
-
- 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
- B22F3/10—Sintering only
- B22F3/105—Sintering only by using electric current other than for infrared radiant energy, laser radiation or plasma ; by ultrasonic bonding
-
- 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
- C22C30/00—Alloys containing less than 50% by weight of each constituent
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- 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
- B22F2009/041—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by mechanical alloying, e.g. blending, milling
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Abstract
The invention belongs to the technical field of high-entropy alloy and discloses high-strength high-entropy alloy NbMoTaWV and a preparation method thereof. The method is a forming method implemented by combining the technologies of mechanical alloying, spark plasma sintering and the like. Compared with a traditional melting and casting method with a vacuum arc furnace, the method is advantageous in that operation is easier and more convenient, the temperature needed for forming is substantially decreased, sintering time is short, and block materials with uniform ingredients and nearly full compactness can be obtained through one-time sintering; besides, dendritic segregation of the alloy is eliminated, grains are refined obviously, and the density of the obtained alloy is 11.6-11.9 g/cm<3>; according to the microscopic structure of the alloy, granular second phases are distributed in an isometric crystal substrate in a dispersed mode, and both the substrate and the second phases are body-centered cubic (BCC) structure solid solutions; according to the optimal compression mechanical properties at room temperature, sigma(0.2) is 2770 MPa, and sigma(bc) is 3661 MPa; epsilon(p) during fracture is 12.5%, room-temperature strength and plasticity are remarkably promoted, and the alloy has quite excellent comprehensive mechanical properties.
Description
Technical field
The invention belongs to technical field of high-entropy, particularly to a kind of high intensity high-entropy alloy
NbMoTaWV and preparation method thereof.
Background technology
The high-entropy alloy that last century, the nineties proposed is a kind of novel conjunction breaking through conventional alloys design concept
Gold.The essential element number of this kind of alloy is typically greater than five, and the atomic percent of every kind of element is roughly the same,
And do not have the atomic percent of a kind of constituent element can become unique essential element more than 50%.Due to alloy
In process of setting, there is high entropic effect, although therefore essential element is more, but this kind of alloy not only will not generate
(such as: body-centered cubic (BCC), the intermetallic compound of various complexity, define simple solid solution phase on the contrary
Face-centered cubic (FCC) or close-packed hexagonal (HCP)).Compared with conventional alloys, the high-entropy alloy of many pivots
There is the excellent properties such as high intensity, high rigidity, wear-resisting, corrosion-resistant and high temperature resistance softening.
The selection of high-entropy alloy element system focuses primarily upon late transition metal, as Cr, Mn, Fe, Co,
Ni, Cu etc..2011, Senkov O.N. et al. first prepared by fusion casting with Nb, Mo, Ta,
W, V refractory metal is the novel high-entropy alloy of essential element, and its microscopic structure is single phase BCC structure,
Compression yield strength under room temperature is 1246MPa, and greatest compressive strength is 1270MPa, moulding during fracture
Property dependent variable be 1.7%, and under 600～1600 DEG C of high temperature, remain to keep higher intensity, therefore should
Alloy very likely becomes high temperature alloy, cutter, mould and the high-abrasive material of a new generation, is used widely.
At present, the preparation of high-entropy alloy is based on vacuum arc furnace ignition fusion casting.But, NbMoTaWV is high
The preparation process of fusing point high-entropy alloy but exists a series of difficult point: owing to the fusing point of alloy is higher (about
2673 DEG C), traditional fusion casting must overcome the difficult problem that heating-up temperature is high, and technology difficulty is bigger；In order to
Make composition uniform, need through repeated revert-melt；Meanwhile, the NbMoTaWV alloy grain that prepared by fusion casting
The thickest the longest dendrite, average grain size is about 80 μm；In liquation process of setting unavoidably
Ground can produce the uneven components phenomenons such as dendritic segregation, and the performance of final products all can be produced bigger by these
Impact.
In recent years, beginning with scholar uses powder metallurgic method to prepare high-entropy alloy.Compared to traditional fusion casting,
Powder metallurgic method technique is simple, and the alloy grain prepared is more tiny, tissue is more uniform, resultant force
Learn the performance alloy that even more than tradition fusion casting is prepared.Such as: use mechanical alloying and electric discharge etc. from
The Al that sub-sintering process is prepared0.6CoNiFeTi0.4Compression yield strength and the fracture strength of alloy respectively reach
2732MPa and 3172MPa, amount of plastic deformation has reached 10.1%, shows good comprehensive mechanical property
Energy (Materials Science&Engineering A, 565 (2013): 439 444).But, use powder
End metallurgy method is prepared the research of high-entropy alloy and is also not used for preparation also in starting stage, the method
NbMoTaWV high-melting-point high-entropy alloy.
The most extremely limited about the document of high-melting-point high-entropy alloy, high-melting-point high-entropy alloy NbMoTaWV
Preparation method be also only limitted to arc cast method.In order to improve tissue and the performance of such alloy, reduce simultaneously
Processing temperature required, simplify preparation technology, the present invention uses the method for powder metallurgy to prepare NbMoTaWV
Alloy.The present invention, for developing the technology of preparing of high-entropy alloy, improves the mechanical property of high-entropy alloy, promotes
Tool is all of great significance by research and the application of high-entropy alloy.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art with not enough, the primary and foremost purpose of the present invention is to provide a kind of high
The preparation method of intensity high-entropy alloy NbMoTaWV.The inventive method first uses mechanical alloying to prepare
The alloy powder of single-phase body-centered cubic (BCC) structure, recycling discharge plasma sintering (SPS) is carried out
Sintering, obtains block materials, by optimizing technique, it is achieved near-net-shape, it is thus achieved that even tissue, crystal grain are thin
Little, there is the block materials of higher-strength and plasticity.
Another object of the present invention is the high intensity high-entropy alloy NbMoTaWV providing said method to prepare.
The purpose of the present invention is realized by following proposal:
A kind of preparation method of high intensity high-entropy alloy NbMoTaWV, the method use mechanical alloying and
The manufacturing process that discharge plasma sintering technique combines, is specially and uses mechanical alloying to prepare single-phase
The NbMoTaWV high-entropy alloy powder of BCC structure, recycling discharge plasma sintering technique is to above-mentioned powder
End is sintered, and obtains high intensity high-entropy alloy NbMoTaWV block materials.
More specifically comprise the steps and process conditions:
Step one: use mechanical alloying method to prepare NbMoTaWV high-entropy alloy powder
The mixing of Nb, Mo, Ta, W, V elemental powders is carried out high-energy ball milling, obtains single-phase BCC knot
The NbMoTaWV alloy powder of structure；
Step 2: discharge plasma sintering
Using the alloy powder that discharge plasma sintering stove sintering step one obtains, its process conditions are as follows:
Agglomerating plant: discharge plasma sintering system
Sintering current type: DC pulse current
Sintering temperature: 1300～1600 DEG C
Temperature retention time: 5～20min
Sintering pressure: 30～50MPa
Heating rate: 50～200 DEG C/min
Sintered acquisition NbMoTaWV high intensity high-entropy alloy block materials.
The ball grinder used in ma process described in step one and the material of abrading-ball are the most stainless
Steel or hard alloy, the process conditions of described ball milling are: ratio of grinding media to material is 5:1～14:1, and rotating speed is 100～300
R/min, Ball-milling Time is 10～80h.
In step one, the amount of Nb, Mo, Ta, W, V elemental powders used such as is preferably at the atomic ratio, it is possible to
Select non-atomic ratio of Denging.
Mixed-powder in step one, in Process During High Energy Ball Milling, gradually realizes alloying, eventually forms single-phase
The alloy powder of BCC structure, now, alloying process completes, and takes out NbMoTaWV high-entropy alloy powder
End is for follow-up sintering.
Mechanical milling process in step one is preferably carried out under inert gas shielding.
The present invention provides the NbMoTaWV high intensity high-entropy alloy block material that a kind of said method prepares
Material, density is 11.6～11.9g/cm3, its microscopic structure is that in equiax crystal matrix, Dispersed precipitate graininess
Second phase, wherein matrix and the second phase are BCC structure solid solution, and the more W of matrix enrichment, Mo,
Nb, its average grain size < 6 μm；And Ta, V that the second phase enrichment is more, its average grain size < 1
μm。
The present invention, relative to prior art, has such advantages as and beneficial effect:
(1) prepared by the method that the present invention uses mechanical alloying and discharge plasma sintering to combine
NbMoTaWV high-entropy alloy, forming technology is easier than traditional vacuum arc furnace ignition fusion casting operation,
Temperature needed for shaping is greatly lowered (being reduced to≤1600 DEG C from >=2673 DEG C), and sintering time is short, and one
Secondary sintering can obtain the uniform and near fully dense block materials of composition, and can realize near-net-shape.Use
Present invention process simplifies, and practicality is good, and significantly reduces energy consumption, therefore has good development prospect.
(2) this invention removes the large dendritic crystal tissue in casting high-entropy alloy NbMoTaWV, matrix
Structural transformation is tiny equiax crystal, so that average grain size reduces, composition is more uniform, Jin Erti
The intensity of high material and plasticity, promote research and the application of high intensity high-entropy alloy.
(3) the optimal mechanical property under the high intensity high-entropy alloy NbMoTaWV room temperature that prepared by the present invention
For: compression yield strength σ0.2=2770MPa, maximum compressive strength σbc=3661MPa, moulding during fracture
Property dependent variable εp=12.5%, compared with the similar alloy that fusion casting obtains, strong room temperature is greatly improved
On the basis of degree, temperature-room type plasticity is also obviously improved, thus improves the comprehensive mechanical property of alloy.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention do not limit
In this.
Embodiment 1
The preparation method of a kind of high intensity high-entropy alloy NbMoTaWV material uses mechanical alloying and electric discharge
The manufacturing process that plasma sintering technique combines, it comprises the steps and process conditions:
Step one: use mechanical alloying method to prepare NbMoTaWV high-entropy alloy powder
(1) by waiting atomic ratio to weigh each 20at.% of Nb, Mo, Ta, W, V elemental powders, and mix
Uniformly.
(2) mixed-powder and abrading-ball are added in the ball grinder of planetary high-energy ball mill and carry out ball milling, tank
The material of body material and abrading-ball is hard alloy, evacuation fill high-purity argon gas (99.99%) in ball grinder
As protective atmosphere.Along with the prolongation of Ball-milling Time, mixed-powder is done step-by-step alloying, by multiple simple substance
The mixed-powder of powder is changed into the alloy powder with single phase BCC structure, meanwhile, the crystalline substance within powder
Grain constantly refinement.The ratio of grinding media to material used in Process During High Energy Ball Milling is 10:1, and rotating speed is 300r/min, ball milling
Time is 10h.
Step 2: discharge plasma sintering
Using the alloy powder in discharge plasma sintering stove sintering step one, its process conditions are as follows:
Agglomerating plant: discharge plasma sintering system
Sintering current type: DC pulse current
Sintering temperature: 1500 DEG C
Temperature retention time: 10min
Sintering pressure: 30MPa
Heating rate: 100 DEG C/min
After the present embodiment sinters, the microscopic structure of NbMoTaWV high-entropy alloy is turned by BCC homogeneous structure
Becoming the line and staff control of two kinds of BCC phases, graininess second phase of precipitation is uniformly distributed in equiax crystal matrix,
The average grain size of matrix is 2.7 μm；The average grain size of the second phase is 0.5 μm, shared volume
Percentage ratio is about 13.8%.The density of high-entropy alloy sintered material is 11.6g/cm3, compression yield under room temperature
Intensity σ0.2Reach 2770MPa, maximum compressive strength σbcReach 3661MPa, plastic strain during fracture
Amount εpReaching 12.5%, microhardness is 774Hv.
Embodiment 2
The preparation method of a kind of high intensity high-entropy alloy NbMoTaWV material uses mechanical alloying and electric discharge
The manufacturing process that plasma sintering technique combines, it comprises the steps and process conditions:
Step one: use mechanical alloying method to prepare NbMoTaWV high-entropy alloy powder
(1) by waiting atomic ratio to weigh each 20at.% of Nb, Mo, Ta, W, V elemental powders, and mix
Uniformly.
(2) mixed-powder and abrading-ball are added in the ball grinder of planetary high-energy ball mill and carry out ball milling, tank
The material of body material and abrading-ball is rustless steel, evacuation fill high-purity argon gas (99.99%) in ball grinder
As protective atmosphere.Along with the prolongation of Ball-milling Time, mixed-powder is done step-by-step alloying, by multiple simple substance
The mixed-powder of powder is changed into the alloy powder with single phase BCC structure, the simultaneously crystal grain within powder
Constantly refinement.The ratio of grinding media to material used in Process During High Energy Ball Milling is 5:1, and rotating speed is 250r/min, Ball-milling Time
For 80h.
Step 2: discharge plasma sintering
Using the alloy powder in discharge plasma sintering stove sintering step one, its process conditions are as follows:
Agglomerating plant: discharge plasma sintering system
Sintering current type: DC pulse current
Sintering temperature: 1600 DEG C
Temperature retention time: 5min
Sintering pressure: 30MPa
Heating rate: 200 DEG C/min
After the present embodiment sinters, the microscopic structure of NbMoTaWV high-entropy alloy is turned by BCC homogeneous structure
Becoming the line and staff control of two kinds of BCC phases, graininess second phase of precipitation is uniformly distributed in equiax crystal matrix,
The average grain size of matrix is 5.2 μm, and the average grain size of the second phase is 0.7 μm, shared volume
Percentage ratio is about 19.9%.The density of alloy is 11.6g/cm3, maximum compressive strength σ under room temperaturebcFor
2059MPa, microhardness is 744Hv.
Embodiment 3
The preparation method of a kind of high intensity high-entropy alloy NbMoTaWV material uses mechanical alloying and electric discharge
The manufacturing process that plasma sintering technique combines, it comprises the steps and process conditions:
Step one: use mechanical alloying method to prepare NbMoTaWV high-entropy alloy powder
(1) by waiting atomic ratio to weigh each 20at.% of Nb, Mo, Ta, W, V elemental powders, and mix
Uniformly.
(2) mixed-powder and abrading-ball are added in the ball grinder of planetary high-energy ball mill and carry out ball milling, tank
The material of body material and abrading-ball is rustless steel, evacuation fill high-purity argon gas (99.99%) in ball grinder
As protective atmosphere.Along with the prolongation of Ball-milling Time, mixed-powder is done step-by-step alloying, by multiple simple substance
The mixed-powder of powder is changed into the alloy powder with single phase BCC structure, the simultaneously crystal grain within powder
Constantly refinement.The ratio of grinding media to material used in Process During High Energy Ball Milling is 14:1, and rotating speed is 100r/min, during ball milling
Between be 60h.
Step 2: discharge plasma sintering
Using the alloy powder in discharge plasma sintering stove sintering step one, its process conditions are as follows:
Agglomerating plant: discharge plasma sintering system
Sintering current type: DC pulse current
Sintering temperature: 1300 DEG C
Temperature retention time: 15min
Sintering pressure: 50MPa
Heating rate: 50 DEG C/min
After the present embodiment sinters, the microscopic structure of NbMoTaWV high-entropy alloy is turned by BCC homogeneous structure
Becoming the line and staff control of two kinds of BCC phases, graininess second phase of precipitation is uniformly distributed in equiax crystal matrix,
Matrix average grain size is 0.7 μm；The average grain size of the second phase is 0.2 μm, shared volume hundred
Proportion by subtraction is about 5.1%.The density of alloy is 11.8g/cm3, maximum compressive strength σ under room temperaturebcIt is 2248
MPa, microhardness is 851Hv.
Embodiment 4
The preparation method of a kind of high intensity high-entropy alloy NbMoTaWV material uses mechanical alloying and electric discharge
The manufacturing process that plasma sintering technique combines, it comprises the steps and process conditions:
Step one: use mechanical alloying method to prepare NbMoTaWV high-entropy alloy powder
(1) by waiting atomic ratio to weigh each 20at.% of Nb, Mo, Ta, W, V elemental powders, and mix
Uniformly.
(2) mixed-powder and abrading-ball are added in the ball grinder of planetary high-energy ball mill and carry out ball milling, tank
The material of body material and abrading-ball is rustless steel, evacuation fill high-purity argon gas (99.99%) in ball grinder
As protective atmosphere.Along with the prolongation of Ball-milling Time, mixed-powder is done step-by-step alloying, by multiple simple substance
The mixed-powder of powder is changed into the alloy powder with single phase BCC structure, meanwhile, the crystalline substance within powder
Grain constantly refinement.The ratio of grinding media to material used in Process During High Energy Ball Milling is 8:1, and rotating speed is 200r/min, during ball milling
Between be 40h.
Step 2: discharge plasma sintering
Using the alloy powder in discharge plasma sintering stove sintering step one, its process conditions are as follows:
Agglomerating plant: discharge plasma sintering system
Sintering current type: DC pulse current
Sintering temperature: 1400 DEG C
Temperature retention time: 20min
Sintering pressure: 40MPa
Heating rate: 100 DEG C/min
After the present embodiment sinters, the microscopic structure of NbMoTaWV high-entropy alloy is turned by BCC homogeneous structure
Becoming the line and staff control of two kinds of BCC phases, graininess second phase of precipitation is uniformly distributed in equiax crystal matrix,
Matrix average grain size is 1.0 μm；The average grain size of the second phase is 0.4 μm, shared volume hundred
Proportion by subtraction is about 12.4%.The density of alloy is 11.9g/cm3, maximum compressive strength σ under room temperaturebcIt is 2639
MPa, microhardness is 802Hv.
Above-described embodiment is the present invention preferably embodiment, but embodiments of the present invention are not by above-mentioned reality
Execute the restriction of example, the change made under other any spirit without departing from the present invention and principle, modification,
Substitute, combine, simplify, all should be the substitute mode of equivalence, within being included in protection scope of the present invention.
Claims (7)
1. the preparation method of a high intensity high-entropy alloy NbMoTaWV, it is characterised in that the method is adopted
The manufacturing process combined with mechanical alloying and discharge plasma sintering technique.
The preparation method of high intensity high-entropy alloy NbMoTaWV the most according to claim 1, its
It is characterised by that the method is specially the NbMoTaWV using mechanical alloying method to prepare single phase BCC structure
Alloy powder, described alloy powder is sintered by recycling discharge plasma sintering technique, obtains high intensity
High-entropy alloy NbMoTaWV block materials.
The preparation method of high intensity high-entropy alloy NbMoTaWV the most according to claim 1, its
It is characterised by specifically including following steps and process conditions thereof:
Step one: use mechanical alloying method to prepare NbMoTaWV high-entropy alloy powder
The mixing of Nb, Mo, Ta, W, V elemental powders is carried out high-energy ball milling, obtains single-phase BCC knot
The NbMoTaWV alloy powder of structure；
Step 2: discharge plasma sintering
Using the alloy powder that discharge plasma sintering stove sintering step one obtains, its process conditions are as follows:
Agglomerating plant: discharge plasma sintering system
Sintering current type: DC pulse current
Sintering temperature: 1300～1600 DEG C
Temperature retention time: 5～20min
Sintering pressure: 30～50MPa
Heating rate: 50～200 DEG C/min
Sintered acquisition NbMoTaWV high intensity high-entropy alloy block materials.
The preparation method of high intensity high-entropy alloy NbMoTaWV the most according to claim 3, its
Be characterised by: the process conditions of ball milling described in step one are: ratio of grinding media to material is 5:1～14:1, rotating speed be 100～
300r/min, Ball-milling Time is 10～80h.
The preparation method of high intensity high-entropy alloy NbMoTaWV the most according to claim 3, its
It is characterised by: in step one, the amount of Nb, Mo, Ta, W, V elemental powders used such as is at the atomic ratio, or
Non-atomic ratio such as grade.
6. a high intensity high-entropy alloy NbMoTaWV, it is characterised in that appoint according to Claims 1 to 5
One described preparation method obtains.
High intensity high-entropy alloy NbMoTaWV the most according to claim 6, it is characterised in that this conjunction
The microscopic structure of gold is that in equiax crystal matrix, Dispersed precipitate graininess the second phase, wherein matrix and second mutually equal
For BCC structure solid solution, and W, Mo, Nb that matrix enrichment is more, its average grain size < 6 μm；
And Ta, V that the second phase enrichment is more, its average grain size < 1 μm.
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| CN107841672A (en) * | 2017-10-25 | 2018-03-27 | 武汉理工大学 | High density ReWTaMoNb containing RexHigh entropy alloy material and preparation method |
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| CN109182877A (en) * | 2018-11-07 | 2019-01-11 | 北京科技大学 | (NbMoTaW)100-xMxIt is infusibility high-entropy alloy and preparation method thereof |
| CN109778050A (en) * | 2019-04-04 | 2019-05-21 | 合肥工业大学 | A kind of WVTaTiZr infusibility high-entropy alloy and preparation method thereof |
| CN110106490A (en) * | 2019-06-12 | 2019-08-09 | 大连理工大学 | A kind of high temperature resistant high-entropy alloy NbMoTaWV film and preparation method thereof |
| CN110195208A (en) * | 2019-06-12 | 2019-09-03 | 大连理工大学 | A kind of NbMoTaWV high-entropy alloy sull of variable band gap and preparation method thereof |
| CN111168057A (en) * | 2020-02-28 | 2020-05-19 | 华南理工大学 | Nano-ceramic reinforced high-entropy alloy composite powder for additive manufacturing and preparation method and application thereof |
| CN111334697A (en) * | 2020-03-10 | 2020-06-26 | 中国人民解放军军事科学院国防科技创新研究院 | W-Ta-Mo-Nb-C high-temperature high-entropy alloy and preparation method thereof |
| CN112958770A (en) * | 2021-02-02 | 2021-06-15 | 合肥工业大学 | Preparation method of WRe/TZM composite material |
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| CN107841672A (en) * | 2017-10-25 | 2018-03-27 | 武汉理工大学 | High density ReWTaMoNb containing RexHigh entropy alloy material and preparation method |
| CN109108273A (en) * | 2018-10-11 | 2019-01-01 | 中国人民解放军国防科技大学 | Preparation method of NbZrTiTa refractory high-entropy alloy powder and NbZrTiTa refractory high-entropy alloy powder |
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| CN109778050A (en) * | 2019-04-04 | 2019-05-21 | 合肥工业大学 | A kind of WVTaTiZr infusibility high-entropy alloy and preparation method thereof |
| CN110106490A (en) * | 2019-06-12 | 2019-08-09 | 大连理工大学 | A kind of high temperature resistant high-entropy alloy NbMoTaWV film and preparation method thereof |
| CN110195208A (en) * | 2019-06-12 | 2019-09-03 | 大连理工大学 | A kind of NbMoTaWV high-entropy alloy sull of variable band gap and preparation method thereof |
| CN110195208B (en) * | 2019-06-12 | 2021-03-19 | 大连理工大学 | Variable band gap NbMoTaWV high-entropy alloy oxide film and preparation method thereof |
| CN111168057A (en) * | 2020-02-28 | 2020-05-19 | 华南理工大学 | Nano-ceramic reinforced high-entropy alloy composite powder for additive manufacturing and preparation method and application thereof |
| CN111334697A (en) * | 2020-03-10 | 2020-06-26 | 中国人民解放军军事科学院国防科技创新研究院 | W-Ta-Mo-Nb-C high-temperature high-entropy alloy and preparation method thereof |
| CN111334697B (en) * | 2020-03-10 | 2021-07-09 | 中国人民解放军军事科学院国防科技创新研究院 | W-Ta-Mo-Nb-C high-temperature high-entropy alloy and preparation method thereof |
| US20230020010A1 (en) * | 2020-03-26 | 2023-01-19 | Hitachi Metals, Ltd. | Alloy and member |
| CN112958770A (en) * | 2021-02-02 | 2021-06-15 | 合肥工业大学 | Preparation method of WRe/TZM composite material |
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