CN114934222A - High-strength high-plasticity tungsten alloy with super strain hardening capacity - Google Patents

High-strength high-plasticity tungsten alloy with super strain hardening capacity Download PDF

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CN114934222A
CN114934222A CN202210528262.XA CN202210528262A CN114934222A CN 114934222 A CN114934222 A CN 114934222A CN 202210528262 A CN202210528262 A CN 202210528262A CN 114934222 A CN114934222 A CN 114934222A
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tungsten
strength
tungsten alloy
plasticity
volume fraction
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秦明礼
杨军军
陈刚
樊峰嵩
章林
吴昊阳
贾宝瑞
许贺彬
于瀛
曲选辉
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University of Science and Technology Beijing USTB
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    • C22C27/00—Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
    • C22C27/04—Alloys based on tungsten or molybdenum
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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    • 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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    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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    • 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
    • C22C32/0047—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 carbides, nitrides, borides or silicides as the main non-metallic constituents
    • C22C32/0052—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 carbides, nitrides, borides or silicides as the main non-metallic constituents only carbides
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    • 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
    • C22C32/0047—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 carbides, nitrides, borides or silicides as the main non-metallic constituents
    • C22C32/0052—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 carbides, nitrides, borides or silicides as the main non-metallic constituents only carbides
    • C22C32/0057—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 carbides, nitrides, borides or silicides as the main non-metallic constituents only carbides based on B4C
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    • 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
    • C22C32/0047—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 carbides, nitrides, borides or silicides as the main non-metallic constituents
    • C22C32/0068—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 carbides, nitrides, borides or silicides as the main non-metallic constituents only nitrides
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Abstract

A high-strength high-plasticity tungsten alloy with super strain hardening capacity. By skillfully compounding the room-temperature brittle metal tungsten and the brittle ceramic, the room-temperature brittle metal tungsten and the brittle ceramic can realize cooperative deformation, and the material has excellent plasticity, strength and super-large strain hardening capacity at room temperature. The ductile-brittle transition temperature of the metal tungsten is reduced to room temperature from more than 600 ℃, and the room temperature compressive strain is more than 20.0 percent and even more than 40.0 percent; the compressive strength is increased along with the increase of compressive strain, and the ultra-large strain hardening capacity is presented, the room-temperature compressive strength exceeds 3.0GPa, even can exceed 5.0GPa, and the product of strength and elongation is more than 4 times of that of the traditional tungsten alloy; has excellent thermal stability, and the average grain size is not more than 5.0 μm and even less than 3.0 μm when the alloy is processed at 2000 ℃ for 10h, which is only 1/10-1/5 of the traditional tungsten alloy. The traditional cognition that the metal tungsten cannot be subjected to room-temperature deformation processing due to brittleness and the strength and plasticity of the material cannot be combined is thoroughly broken through, and a new idea is provided for the strengthening and toughening design of other brittle materials.

Description

High-strength high-plasticity tungsten alloy with super strain hardening capacity
Technical Field
The invention belongs to the technical field of powder metallurgy, and relates to a high-strength high-plasticity tungsten alloy with super strain hardening capacity.
Background
The metal tungsten (W) has the highest melting point (3390-3423 ℃) and boiling point (5700 +/-200 ℃) and the lowest vapor pressure, and also has a high density (19.3 g/cm) 3 ) The high-temperature-resistant high-strength high-temperature-resistant high-performance high-strength high-temperature-resistant high-performance high-temperature-resistant material has a series of excellent characteristics such as high elastic modulus, high strength and low thermal expansion coefficient, plays an important role in engineering application fields such as modern national defense, atomic energy and electric vacuum. However, due to the poor grain boundary bonding and the low effective slip system below the ductile-to-brittle transition temperature (DBTT), metallic tungsten is brittle (nearly zero plasticity) at room temperature, greatly limiting its applications, which is also a common problem and bottleneck for such brittle metallic materials. Therefore, how to improve the toughness and the processability of the metallic tungsten at room temperature is a great challenge in the field at present.
In recent years, a lot of research has been carried out around the toughening of metallic tungsten, and the most effective methods currently considered are deformation and rhenium alloying, however, the former are limited to the production of wire or plate products, while the latter require deformation processing because rhenium is expensive and generally requires a complex shape, and further, these methods are complicated in preparation process, high in cost, and limited to the preparation of products with simple shapes, and have some difficulty in the preparation of products with complex shapes. Therefore, the research on a new strengthening and toughening method of the metal tungsten is significant to promote the development and the application of the metal tungsten.
Disclosure of Invention
The invention provides a high-strength high-plasticity tungsten alloy with super-large strain hardening capacity, which comprises the following specific components, structures and properties:
(1) the components: the tungsten-based ceramic material is composed of a metal tungsten matrix and a ceramic second phase, wherein the volume fraction of the second phase is 3.0-40.0%. The second phase is oxide (La) 2 O 3 、Y 2 O 3 、Lu 2 O 3 、Ce 2 O 3 、Al 2 O 3 、ZrO 2 、ThO 2 、HfO 2 ) Carbide (TiC, ZrC, TaC), nitride (AlN, TiN, BN) or boride (B) 4 C、TiB 2 、ZrB 2 、HfB 2 ) At least one of (1).
(2) Microstructure: the relative density is not less than 95.0%, and the average size of tungsten crystal grains is not more than 3.0 μm. The ceramic second phase particles are uniformly distributed in the tungsten crystal grains and at the grain boundary, and form a good interface structure with the tungsten matrix, preferably a coherent or semi-coherent interface. Wherein the volume fraction of the intragranular second phase particles is 1.0-10.0%, the average particle size is not more than 100.0nm, the volume fraction of the intergranular second phase particles is 2.0-39.0%, and the average particle size is not more than 2.0 μm.
(3) Performance: has low ductile-brittle transition temperature, high strength and plasticity and excellent thermal stability. The ductile-brittle transition temperature of the metal tungsten is reduced to room temperature from more than 600 ℃, and the room temperature compression plasticity is more than 20.0 percent and even can exceed 40.0 percent; the compressive strength is increased along with the increase of compressive strain, and the ultra-large strain hardening capacity is presented, the room-temperature compressive strength is more than 3.0GPa, even more than 5.0GPa, and is improved by 2-4 times compared with the traditional tungsten alloy; the average grain size is not more than 5.0 mu m, even less than 3.0 mu m after the high temperature treatment at 2000 ℃ for 10 hours, and is only 1/10-1/5 of the traditional tungsten alloy.
Further, the relative density of the high-strength high-plasticity tungsten alloy with the ultra-large strain hardening capacity is preferably not less than 98.0%.
Further, the grain size of the high strength high plasticity tungsten alloy with ultra large strain hardening capacity is preferably less than 2.0 μm.
Further, the volume fraction of the second phase particles contained in the high-strength high-plasticity tungsten alloy with the super strain hardening capacity is preferably as follows: 6.0-20.0%, the volume fraction of the second phase particles in the crystal is preferably 2.0-8.0%, and the average particle size is preferably less than 60.0 nm; the volume fraction of the grain boundary second phase particles is preferably 4.0-18.0%, and the average grain diameter is preferably less than 1.2 μm; the second phase particles in the crystal and at the crystal boundary have good interface combination with the tungsten matrix, and preferably have a coherent structure (i.e. atoms on the two-phase interface are in a perfect matching relationship).
Further, the high-strength high-plasticity tungsten alloy with the super strain hardening capacity has high plasticity at room temperature, and the room-temperature compression plasticity can even exceed 40.0%.
Furthermore, the high-strength high-plasticity tungsten alloy with the super strain hardening capacity has high strength at room temperature, and the room-temperature compressive strength can even exceed 5.0GPa, which is improved by 2-4 times compared with the traditional tungsten alloy.
Furthermore, the high-strength high-plasticity tungsten alloy with the super strain hardening capacity has excellent thermal stability, is processed at the high temperature of 2000 ℃ for 10 hours, has an average grain size even smaller than 3.0 mu m, and is only 1/10-1/5 of the traditional tungsten alloy.
According to the invention, deformation and rhenium alloying are not required, room temperature brittle metal tungsten and brittle ceramics are creatively and skillfully compounded, the proportion of the volume fraction of intragranular second phase particles to the volume fraction of grain boundary second phase particles is reasonably controlled, and the second phase particles and the metal W form a coherent or semi-coherent interface, so that the two can realize cooperative deformation at room temperature, and the material presents excellent plasticity, strength and super-large strain hardening capacity. The fine grain tungsten alloy prepared by adopting the processes of hot isostatic pressing, spark plasma sintering, rolling and the like reported in the past literature generally shows that the strength is low when the plasticity is high, however, the tungsten alloy provided by the invention shows the unique combination of the strength and the plasticity, the compressive strength is increased along with the increase of compressive strain, and the tungsten alloy has the characteristics of ultra-large strain hardening capacity and high strength and high plasticity, not only thoroughly breaks through the traditional cognition that the room-temperature deformation processing of metal tungsten cannot be carried out due to the brittleness of the metal tungsten and the strength and the plasticity of the material cannot be compatible generally, but also provides a new idea for the strengthening and toughening design of other brittle materials (such as brittle metal molybdenum, ceramics and the like).
The metal tungsten has large brittleness at room temperature and high ductile-brittle transition temperature (DBTT) (generally higher than 600 ℃), which not only causes that the metal tungsten cannot be deformed at room temperature, but also limits the application of the metal tungsten. The ductile-brittle transition temperature of the metal tungsten is reduced to room temperature from more than 600 ℃, the ductile-brittle transition temperature has excellent processing deformability at room temperature, the compressive strain of the ductile-brittle transition temperature exceeds 20.0 percent, and even can reach more than 40.0 percent, and the ductile-brittle transition temperature has important significance for improving the processing performance of the metal tungsten and expanding the application of the metal tungsten.
The room temperature compressive strength of conventional ultra-fine grained tungsten is low, typically less than 2.0GPa, due to poor strain hardening capability. The invention greatly improves the strain hardening capacity and the compressive strength of the metal tungsten, and the room-temperature compressive strength of the metal tungsten can reach 3.0GPa and even exceed 5.0GPa, which is improved by 2 to 4 times compared with the traditional tungsten alloy.
After the traditional tungsten alloy is in service at high temperature, the abnormal growth of crystal grains usually occurs, the size of the crystal grains can often grow to more than 30.0 mu m when the metal tungsten is treated at the temperature of more than 2000 ℃. The tungsten alloy provided by the invention has excellent thermal stability, and after being treated at 2000 ℃ for 10 hours, the average grain size is not more than 5.0 mu m, even less than 3.0 mu m, and is only 1/10-1/5 of the traditional tungsten alloy.
Detailed Description
Example 1
A lanthanum oxide dispersion strengthening tungsten alloy has a relative density of 97.0%, tungsten crystal grain size of 0.5 μm, lanthanum oxide volume fraction of 6.0%, mean size of lanthanum oxide particles in crystal of 60.0nm, volume fraction of about 2.0%; the average size of lanthanum oxide particles at the grain boundary is 150.0nm, and the volume fraction is 4.0%; the room temperature compressive strength of the material is 3.1GPa, and the fracture strain reaches 24.0%.
Example 2
A lanthanum oxide dispersion strengthening tungsten alloy has a relative density of 97.9%, a tungsten grain size of 0.7 μm, a lanthanum oxide volume fraction of 13.5%, an intra-grain lanthanum oxide particle average size of 60.0nm, and a volume fraction of about 3.0%; the average size of lanthanum oxide particles at the grain boundary is 150.0nm, and the volume fraction is 10.5%; the room-temperature compressive strength of the material is 3.3GPa, and the fracture strain reaches 26.2%.
Example 3
A lanthanum oxide dispersion strengthening tungsten alloy has a relative density of 98.2%, a tungsten crystal grain size of 0.9 μm, a lanthanum oxide volume fraction of 13.5%, an intra-crystal lanthanum oxide particle average size of 60.0nm, and a volume fraction of about 3.5%; the average size of lanthanum oxide particles at the grain boundary is 200.0nm, and the volume fraction is 10.0 percent; the room temperature compressive strength of the material is 4.2GPa, and the fracture strain reaches 33.5 percent.
Example 4
A lanthanum oxide dispersion strengthening tungsten alloy has a relative density of 98.5%, a lanthanum oxide volume fraction of 13.5%, a tungsten grain size of 1.0 μm, an average intra-grain lanthanum oxide particle size of 60.0nm, and a volume fraction of about 3.0%; the average size of lanthanum oxide particles at the grain boundary is 220.0nm, and the volume fraction is 10.5%; the room temperature compressive strength of the material is 4.4GPa, and the fracture strain reaches 34.2%.
Example 5
A lanthanum oxide dispersion strengthening tungsten alloy has a relative density of 95.5%, a lanthanum oxide volume fraction of 10.0%, a tungsten grain size of 0.9 μm, an average intra-grain lanthanum oxide particle size of 60.0nm, and a volume fraction of about 3.5%; the average size of lanthanum oxide particles at the grain boundary is 160.0nm, and the volume fraction is 6.5%; the room temperature compression strength of the material is 3.4GPa, and the fracture strain reaches 27.2%.
Example 6
A lanthanum oxide dispersion strengthening tungsten alloy has a relative density of 98.2%, a lanthanum oxide volume fraction of 10.0%, a tungsten grain size of 1.3 μm, an average intra-grain lanthanum oxide particle size of 60.0nm, and a volume fraction of about 3.0%; the average size of lanthanum oxide particles at the grain boundary is 180.0nm, and the volume fraction is 7.0 percent; the room temperature compressive strength of the material is 4.4GPa, and the fracture strain reaches 35.2%.
Example 7
A lanthanum oxide dispersion strengthening tungsten alloy has a relative density of 98.0%, a lanthanum oxide volume fraction of 10.0%, a tungsten grain size of 1.2 μm, an average intra-grain lanthanum oxide particle size of 60.0nm, and a volume fraction of about 3.5%; the average size of lanthanum oxide particles at the grain boundary is 160.0nm, and the volume fraction is 6.5%; the room temperature compressive strength of the material is 4.3GPa, and the fracture strain reaches 33.2 percent.
Example 8
A lanthanum oxide dispersion strengthening tungsten alloy has a relative density of 98.5%, a lanthanum oxide volume fraction of 10.0%, tungsten crystal grain size of 1.4 μm, an average size of lanthanum oxide particles in the crystal of 60.0nm, and a volume fraction of about 2.8%; the average size of lanthanum oxide particles at the grain boundary is 190.0nm, and the volume fraction is 7.2%; the room temperature compressive strength of the material is 4.8GPa, and the fracture strain reaches 37.2 percent.
Example 9
A lanthanum oxide dispersion strengthening tungsten alloy, the relative density is 97.8%, the lanthanum oxide volume fraction is 20.0%, the tungsten grain size is 0.8 μm, the average size of the lanthanum oxide grain in the crystal is 60.0nm, the volume fraction is about 4.5%; the average size of lanthanum oxide particles at the grain boundary is 160.0nm, and the volume fraction is 15.5%; the room temperature compressive strength of the material is 3.2GPa, and the fracture strain reaches 24.2 percent.
Example 10
A lanthanum oxide dispersion strengthening tungsten alloy has a relative density of 98.2%, a lanthanum oxide volume fraction of 20.0%, a tungsten grain size of 1.0 μm, an average intra-grain lanthanum oxide particle size of 60.0nm, and a volume fraction of about 4.0%; the average size of lanthanum oxide particles at the grain boundary is 160.0nm, and the volume fraction is 16.0%; the room-temperature compressive strength of the material is 3.6GPa, and the fracture strain reaches 26.4%.
Example 11
An yttrium oxide dispersion strengthened tungsten alloy, the relative density is 98.5%, the volume fraction of yttrium oxide is 10.0%, the tungsten grain size is 1.2 μm, the average size of the intra-grain yttrium oxide particles is 50.0nm, and the volume fraction is about 3.0%; the average size of yttrium oxide particles at the grain boundary is 160.0nm, and the volume fraction is 7.0%; the room temperature compressive strength of the material is 4.5GPa, and the fracture strain reaches 34.0 percent.
Example 12
An yttrium oxide dispersion-strengthened tungsten alloy, the relative density is 98.5%, the volume fraction of yttrium oxide is 20.0%, the tungsten grain size is 0.9 μm, the average size of the intra-grain yttrium oxide particles is 60.0nm, and the volume fraction is about 4.5%; the average size of yttrium oxide particles at the grain boundary is 200.0nm, and the volume fraction is 15.5%; the room temperature compression strength of the material is 3.5GPa, and the fracture strain reaches 26.0%.
Example 13
A titanium carbide dispersion strengthening tungsten alloy has a relative density of 99.0%, a volume fraction of titanium carbide of 9.0%, tungsten crystal grains of 1.2 μm, an average size of intragranular titanium carbide particles of 50.0nm, and a volume fraction of about 4.0%; the average size of titanium carbide particles at the grain boundary is 160.0nm, and the volume fraction is 5.0%; the room temperature compression strength of the material is 5.2GPa, and the fracture strain reaches 40.0%.
Example 14
A hafnium oxide dispersion strengthened tungsten alloy, the relative density is 96.0%, the volume fraction of hafnium oxide is 18.0%, the tungsten crystal grain size is 1.1 μm, the average size of the hafnium oxide particles in the crystal is 70.0nm, the volume fraction is about 3.0%; the average size of hafnium oxide particles at the grain boundary is 300.0nm, and the volume fraction is 15.0%; the room temperature compressive strength of the material is 4.5GPa, and the fracture strain reaches 33.0%.
Example 15
An aluminum nitride dispersion strengthened tungsten alloy, the relative density is 99.0%, the volume fraction of aluminum nitride is 6.0%, the tungsten crystal grain size is 1.0 μm, the average size of the aluminum nitride grain in the crystal is 40.0nm, the volume fraction is about 2.0%; the average size of aluminum nitride particles at the grain boundary is 100.0nm, and the volume fraction is 4.0 percent; the room temperature compressive strength of the material is 3.2GPa, and the fracture strain reaches 22.6 percent.
Example 16
A boron carbide dispersion strengthening tungsten alloy, the relative density is 98.0 percent, the volume fraction of boron carbide is 10.0 percent, the size of tungsten crystal grains is 1.3 mu m, the average size of boron carbide particles in the crystal is 50.0nm, and the volume fraction is about 3.0 percent; the average size of boron carbide particles at the grain boundary is 210.0nm, and the volume fraction is 7.0%; the room temperature compressive strength of the material is 4.5GPa, and the fracture strain reaches 32.4 percent.
Example 17
A lutetium oxide dispersion strengthening tungsten alloy, the relative density is 97.0%, the volume fraction of lutetium oxide is 10.0%, the grain size of tungsten is 0.6 μm, the average size of lutetium oxide in the grain is 60.0nm, and the volume fraction is about 3.0%; the average size of lutetium oxide particles at the grain boundary is 100.0nm, and the volume fraction is 7.0 percent; the room temperature compressive strength of the material is 3.6GPa, and the fracture strain reaches 25.0%.
Example 18
The zirconia dispersion strengthening tungsten alloy has the relative density of 98.0 percent, the volume fraction of yttria of 10.0 percent, the tungsten grain size of 1.2 mu m, the average size of zirconia grains in crystal of 50.0nm and the volume fraction of 3.0 percent; the average size of zirconia particles at the grain boundary is 180.0nm, and the volume fraction is 7.0%; the compression strength of the material under room temperature compression is 4.6GPa, and the fracture strain position is 36.0%.
Example 19
A zirconium carbide dispersion strengthening tungsten alloy, the relative density is 97.0%, the zirconium carbide volume fraction is 12.0%, the tungsten grain size is 1.1 μm, the intra-crystal zirconium carbide particle size is 60.0nm on average, the volume fraction is about 3.0%; the average size of zirconium carbide particles at the grain boundary is 200.0nm, and the volume fraction is 9.0%; the room temperature compressive strength of the material is 4.1GPa, and the fracture strain reaches 33.5 percent.
Example 20
An alumina dispersion strengthening tungsten alloy, the relative density is 98.4%, the alumina mass fraction is 13.0%, the tungsten grain size is 1.0 μm, the average size of alumina grains in the grains is 60.0nm, and the volume fraction is 4.0%; the average size of alumina particles at the grain boundary is 200.0nm, and the volume fraction is 9.0 percent; the material has a compression strength of 4.4GPa and a fracture strain of 34.2% under room-temperature compression.

Claims (7)

1. A high-strength high-plasticity tungsten alloy with super strain hardening capacity is characterized by comprising the following components in percentage by weight:
(1) the components: consists of tungsten matrix and second phase particles, the volume fraction of the second phase particles is 3.0-40.0%, and the second phase particles are oxide (La) 2 O 3 、Y 2 O 3 、Lu 2 O 3 、Ce 2 O 3 、Al 2 O 3 、ZrO 2 、ThO 2 、HfO 2 ) Carbide (TiC, ZrC, BC), nitride (AlN, TiN, BN) or boride (B) 4 C、TiB 2 、ZrB 2 、HfB 2 ) At least one of;
(2) organizing: the relative density is not less than 95.0%, and the average size of tungsten crystal grains is not more than 3.0 μm; the second phase particles are uniformly distributed in the tungsten crystal grains and at the crystal boundary and form good interface combination with the tungsten matrix, wherein the volume fraction of the second phase particles in the tungsten crystal grains is 1.0-10.0%, the average particle size is not more than 100.0nm, the volume fraction of the second phase particles in the crystal boundary is 2.0-39.0%, and the average particle size is not more than 2.0 μm;
(3) the performance is as follows: low ductile-brittle transition temperature, high strength and plasticity and excellent thermal stability; the ductile-brittle transition temperature is reduced from above 600 ℃ to room temperature, and the room temperature compressive strain is more than 20.0 percent; the compressive strength is increased along with the increase of the compressive strain, and the ultra-large strain hardening capacity is presented, and the room-temperature compressive strength is more than 3.0 GPa; the average grain size is not more than 5.0 μm after high temperature treatment at 2000 deg.C for 10 hr.
2. A high-strength high-plasticity tungsten alloy according to claim 1, wherein the relative density of the tungsten alloy is not less than 98.0%.
3. A high strength and high plasticity tungsten alloy according to claim 1, characterized in that the grain size of the tungsten alloy is: 500.0 nm-2.0 μm.
4. The high-strength high-plasticity tungsten alloy according to claim 1, wherein the volume fraction of the second-phase particles contained in the tungsten alloy is: 6.0-20.0%, the volume fraction of the second phase particles in the crystal is 2.0-8.0%, and the average particle diameter is less than 60.0 nm; the volume fraction of the grain boundary second phase particles is 4.0-18.0%, and the average grain diameter is less than 1.2 mu m; the second phase particles in the crystal and at the boundary have good interface combination with the tungsten matrix and are coherent interface structures, namely atoms on the two-phase interface are in complete matching relation.
5. High-strength high-plasticity tungsten alloy according to claim 1, characterized in that it has high plasticity at room temperature, with a room-temperature compression plasticity greater than 20.0%, and possibly even exceeding 40.0%.
6. The high-strength high-plasticity tungsten alloy according to claim 1, wherein the tungsten alloy has high strength at room temperature, and the room-temperature compressive strength can reach 3.0GPa and even exceed 5.0GPa, which is improved by 2-4 times compared with the traditional tungsten alloy.
7. The high-strength high-plasticity tungsten alloy according to claim 1, wherein the tungsten alloy has excellent thermal stability, and the average grain size is not more than 5.0 μm and even less than 3.0 μm after being treated at the high temperature of 2000 ℃ for 10 hours, and is only 1/10-1/5 of the traditional tungsten alloy.
CN202210528262.XA 2022-05-16 2022-05-16 High-strength high-plasticity tungsten alloy with super strain hardening capacity Pending CN114934222A (en)

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