CN115627405B - Liquid lead bismuth corrosion-resistant high-entropy alloy and preparation method thereof - Google Patents
Liquid lead bismuth corrosion-resistant high-entropy alloy and preparation method thereof Download PDFInfo
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- 239000000956 alloy Substances 0.000 title claims abstract description 96
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 94
- 230000007797 corrosion Effects 0.000 title claims abstract description 44
- 238000005260 corrosion Methods 0.000 title claims abstract description 44
- 239000007788 liquid Substances 0.000 title claims abstract description 32
- 229910052797 bismuth Inorganic materials 0.000 title claims abstract description 30
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title abstract description 9
- 238000005096 rolling process Methods 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 14
- 239000011159 matrix material Substances 0.000 claims abstract description 11
- 238000002844 melting Methods 0.000 claims abstract description 10
- 230000008018 melting Effects 0.000 claims abstract description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 8
- 230000032683 aging Effects 0.000 claims abstract description 8
- 238000000137 annealing Methods 0.000 claims abstract description 8
- 229910052802 copper Inorganic materials 0.000 claims abstract description 8
- 239000010949 copper Substances 0.000 claims abstract description 8
- 229910052742 iron Inorganic materials 0.000 claims abstract description 7
- 238000000265 homogenisation Methods 0.000 claims abstract description 6
- 239000000126 substance Substances 0.000 claims abstract description 6
- 238000004321 preservation Methods 0.000 claims description 8
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 229910000943 NiAl Inorganic materials 0.000 claims description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 2
- 238000004512 die casting Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 13
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 9
- 150000002926 oxygen Chemical class 0.000 description 9
- 239000001301 oxygen Substances 0.000 description 9
- 229910052760 oxygen Inorganic materials 0.000 description 9
- 239000011651 chromium Substances 0.000 description 5
- 238000003723 Smelting Methods 0.000 description 3
- UDRRLPGVCZOTQW-UHFFFAOYSA-N bismuth lead Chemical compound [Pb].[Bi] UDRRLPGVCZOTQW-UHFFFAOYSA-N 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000004090 dissolution Methods 0.000 description 3
- 238000005530 etching Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000010453 quartz Substances 0.000 description 3
- 238000001878 scanning electron micrograph Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 206010021143 Hypoxia Diseases 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 229910001152 Bi alloy Inorganic materials 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 230000036314 physical performance Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Classifications
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- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
-
- 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
- C22C1/02—Making non-ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
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Abstract
The invention relates to the field of corrosion-resistant alloy materials, in particular to a liquid lead bismuth corrosion-resistant high-entropy alloy and a preparation method thereof. The high-entropy alloy comprises the following chemical components in percentage by weight: fe: 30-55%; ni: 15-30%; cr: 15-30%; al: 5-15%. The method prepares the alloy plate by arc melting and copper die casting, carries out homogenization treatment and rolling deformation on the alloy plate, and then carries out annealing and aging treatment to obtain a dual-phase structure with a face-centered cubic matrix and a body-centered cubic ordered precipitated phase, and the special structure enables the alloy to have stronger strong plasticity synergy. In addition, the Fe, cr and Al multilayer oxide film structure formed in the alloy can inhibit the occurrence of soluble corrosion in a lead-bismuth environment, so that the corrosion performance of the alloy is improved, and the alloy has important application prospect.
Description
Technical Field
The invention relates to the field of corrosion-resistant alloy materials, in particular to a liquid lead bismuth corrosion-resistant high-entropy alloy and a preparation method thereof.
Background
The liquid lead bismuth alloy (LBE) has the advantages of excellent neutron performance, chemical inertia, thermal physical performance, irradiation resistance and the like, is a preferred material of a fourth-generation nuclear energy system lead cold fast reactor coolant, and is also an important candidate material of a coolant and spallation target of an accelerator driving subcritical system. However, LBE can cause severe liquid metal corrosion to the structural material, mainly because metal atoms in the structural material gradually dissolve and migrate into the LBE, while LBE also diffuses into the material along grain boundaries. The structural materials are corroded and destroyed, and the safe operation of the lead-cooled fast reactor is affected. In addition, the concentration of oxygen in LBE affects the formation of oxide film on the surface of the structural material when the oxygen content in LBE is less than 10 -7 At wt.% the surface is not able to form a complete protective oxide film, dissolution corrosion will occur; when the oxygen content in LBE is higher than 10 -5 In wt.%, the oxide film formed is thicker and easily separated from the substrate and broken, and serious oxidation corrosion occurs.
The high-entropy alloy has four effects different from the traditional alloy due to the diversification of component designs, improves the comprehensive properties of the alloy including the irradiation resistance, and makes the alloy the most potential nuclear structure candidate material. The high-entropy alloy with excellent corrosion resistance is used as a nuclear structure material and has practical significance.
Disclosure of Invention
The invention mainly aims to provide a liquid lead bismuth corrosion-resistant high-entropy alloy and a preparation method thereof, wherein the high-entropy alloy has a face-centered cubic and body-centered cubic dual-phase structure, and has good room temperature mechanical properties and LBE corrosion resistance under the condition of oxygen deficiency or saturated oxygen.
The invention aims at solving the technical problems by adopting the following technical scheme:
the liquid lead bismuth corrosion resistant high-entropy alloy comprises the following chemical components in percentage by weight:
Fe：30～55％；Ni：15～30％；Cr：15～30％；Al：5～15％。
the microstructure of the high-entropy alloy is characterized by a face-centered cubic and body-centered cubic dual-phase structure.
The high-entropy alloy resistant to liquid lead bismuth corrosion has a face-centered cubic phase which is a disordered structural matrix phase enriched in Fe and Cr.
The high-entropy alloy resistant to liquid lead bismuth corrosion has a body-centered cubic phase which is an ordered B2-NiAl phase and is dispersed in a face-centered cubic matrix phase.
The high-entropy alloy resistant to liquid lead bismuth corrosion has the yield strength of 450-550 MPa, the tensile strength of 750-860 MPa and the elongation of 25-35% under the room temperature condition.
The preparation method of the liquid lead bismuth corrosion-resistant high-entropy alloy comprises the following steps:
(1) Weighing raw materials according to a preset component proportion, preparing an alloy ingot by adopting arc melting, and casting into an alloy plate by adopting a copper mold casting method;
(2) And carrying out homogenization treatment, rolling deformation treatment, annealing and aging treatment on the alloy plate to obtain the FeNiCrAl high-entropy alloy.
In the preparation method of the liquid lead-bismuth corrosion-resistant high-entropy alloy, in the step (1), a vacuum chamber is firstly pre-vacuumized until the air pressure is lower than 1 multiplied by 10 -2 Pa, then filling high purity argon gas to make the pressure of vacuum chamber 3 x 10 4 ～9×10 4 Pa, arc melting is carried out, the melting current is 280-500A, and the alloy melt is poured into a copper mold with corresponding size, so that the alloy plate is obtained.
In the step (2), the homogenization treatment temperature is 1000-1250 ℃, the heat preservation time is 1-4 h, and the liquid lead-bismuth corrosion-resistant high-entropy alloy is cooled to room temperature; the rolling deformation treatment is room temperature rolling, the alloy plate rotates 180 degrees after each pass of rolling along the length direction, and each pass of rolling is 0.1-0.3 mm until the thickness deformation of the alloy plate is 60% -80%.
In the step (2), the annealing temperature is 900-1100 ℃, the heat preservation time is 0.5-2.5 h, and the alloy is air-cooled to room temperature; the aging temperature is 500-900 ℃, the heat preservation time is 1-500 h, and the water cooling is carried out to room temperature.
The design idea of the invention is as follows:
according to the invention, on one hand, the content of Ni element with high dissolution tendency of liquid lead bismuth in the high-entropy alloy is controlled, so that the occurrence of solubility corrosion is inhibited, meanwhile, with the addition of Fe, cr and Al, an alumina film with a compact, uniform and stable outer layer and a chromium oxide and ferric oxide film with an inner layer can be formed. The multi-layer oxide film structure can effectively reduce the diffusion rate of alloy elements and has the function of inhibiting dissolution corrosion of structural materials. On the other hand, the surface-centered cubic and body-centered cubic dual-phase structure is obtained by using cold rolling (60% -80%), high-temperature recrystallization annealing (900-1100 ℃ plus 0.5-2.5 h) and low-temperature aging (500-900 ℃ plus 1-500 h) process modulation, so as to achieve the strength-plasticity balance of the alloy.
By means of the technical scheme, the high-entropy alloy resistant to liquid lead bismuth corrosion has at least the following advantages:
1. the high-entropy alloy resistant to liquid lead bismuth corrosion is a new alloy design scheme provided for solving the problems of the existing nuclear structural material, and can simultaneously meet the performance requirements on high toughness and resistance to liquid lead bismuth corrosion under the condition of oxygen deficiency or saturated oxygen.
2. The high-entropy alloy resistant to liquid lead bismuth corrosion has good LBE corrosion resistance, and after corrosion in LBE at 550 ℃ for 1000 hours, the corrosion rate under saturated oxygen condition is obviously lower than that of lean oxygen.
3. The high-entropy alloy resistant to liquid lead bismuth corrosion has a special dual-phase structure and room-temperature mechanical properties: the yield strength is 450-550 MPa, the tensile strength is 750-860 MPa, and the elongation is 25-35%.
4. The high-entropy alloy resistant to liquid lead bismuth corrosion is easy to realize in an alloy system, a processing method and a heat treatment process, and has higher application value in the field of nuclear structural materials.
The foregoing description is only an overview of the present invention, and is intended to provide a better understanding of the present invention, as it is embodied in the following description, with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
Figure 1 is an XRD pattern of an embodiment of the present invention.
FIG. 2 is an SEM-EDS image of the surface morphology of example 3 of the present invention. Fig. 2 (b) is a partial enlarged view of fig. 2 (a).
FIG. 3 is an engineering stress-strain diagram of an embodiment of the present invention.
Fig. 4 is an SEM image of the cross-sectional morphology of the etched layer after etching in liquid bismuth lead at 550 ℃ for 1000 hours, respectively, in example 2 of the present invention. Fig. 4 (a) shows the lean oxygen concentration, and fig. 4 (b) shows the saturated oxygen concentration.
Fig. 5 is an SEM image of the cross-sectional morphology of the etched layer after etching in liquid bismuth lead at 550 ℃ for 1000 hours, respectively, in example 3 of the present invention. Fig. 5 (a) shows the lean oxygen concentration, and fig. 5 (b) shows the saturated oxygen concentration.
Fig. 6 is an SEM image of the cross-sectional morphology of the etched layer after 1000 hours of etching in liquid bismuth lead at 550 ℃ in example 4 of the present invention. Fig. 6 (a) shows the lean oxygen concentration, and fig. 6 (b) shows the saturated oxygen concentration.
Detailed Description
The following detailed description of specific embodiments of the invention is provided in connection with the accompanying drawings and examples in order to provide a better understanding of the aspects of the invention and advantages thereof. However, the following description of specific embodiments and examples is for illustrative purposes only and is not intended to be limiting of the invention.
In a specific implementation process, the invention provides a liquid lead bismuth corrosion-resistant high-entropy alloy, and the chemical composition, the microcosmic appearance and the specific preparation technology of the alloy are as follows:
1. the high-entropy alloy comprises the following chemical components in percentage by weight: fe: 30-55%; ni: 15-30%; cr: 15-30%; al: 5-15%.
2. The microstructure characteristics of the high-entropy alloy are described as follows:
(1) The microstructure of the alloy is a face-centered cubic and body-centered cubic dual-phase structure.
(2) The face-centered cubic phase is a disordered structural matrix phase enriched in Fe and Cr.
(3) The body-centered cubic phase is an ordered B2-NiAl phase, and is dispersed in the body-centered cubic matrix phase, wherein the volume ratio of the body-centered cubic phase is 5% -30%.
3. The preparation method of the high-entropy alloy comprises the following steps:
(1) Weighing metal raw materials with purity of more than 99.95wt.% according to preset composition ratio, and pre-vacuumizing vacuum chamber to air pressure of 3.5X10 -3 Pa, then charging high purity argon (volume purity 99.999%) to make the vacuum chamber pressure 4×10 4 Pa. The alloy smelting current is 350A, each smelting is carried out for 3 minutes, the alloy is turned over and smelted again after each smelting, and the process is repeated for at least 6 times until the alloy components are uniform; and (3) melting an alloy ingot through arc melting and heating, and rapidly pouring the alloy melt into a copper mold with corresponding dimensions by using a copper mold casting method to obtain an alloy plate with dimensions of 60mm multiplied by 24mm multiplied by 4 mm.
(2) Homogenizing the alloy plate, sealing with vacuum quartz tube with air pressure of 2×10 - 3 Pa, homogenizing at 1100 ℃, keeping the temperature for 2 hours, and water-cooling to room temperature; and rolling into the required thickness by utilizing a double-rail rolling mill along a fixed direction in a small step length and multiple times at room temperature, wherein each time of rolling is 0.2mm, and the total rolling is 12 times, namely the thickness of the plate is reduced from original 4mm to 1.6mm.
(3) The cold-rolled sheet is annealed and aged, and sealed by a vacuum quartz tube, and the air pressure in the vacuum quartz tube is 2 multiplied by 10 -3 Pa, annealing temperature is 1000 ℃, heat preservation time is 1h, and air cooling is carried out to room temperature; aging temperature is 700 ℃, heat preservation time is 10 hours, water cooling is carried out to room temperature, and FeNiC is obtainedrAl high entropy alloy.
Table 1 alloy chemistry (wt.%)
| Fe | Ni | Cr | Al | |
| Example 1 | 42.113 | 33.195 | 19.605 | 5.087 |
| Example 2 | 47.207 | 33.075 | 14.650 | 5.068 |
| Example 3 | 52.592 | 27.636 | 14.690 | 5.082 |
| Example 4 | 52.926 | 22.249 | 19.711 | 5.114 |
TABLE 2 Room temperature mechanical Properties of the high entropy alloy of the examples of the invention
| Yield strength (MPa) | Tensile strength (MPa) | Elongation (%) | |
| Example 1 | 548 | 858 | 31 |
| Example 2 | 496 | 800 | 30 |
| Example 3 | 483 | 786 | 30 |
| Example 4 | 526 | 817 | 29 |
As shown in FIG. 1, the high-entropy alloys of examples 1-4 have phase compositions, the four alloys have a two-phase face-centered cubic plus body-centered cubic structure, the body-centered cubic phase is an ordered B2-NiAl phase, the phases are dispersed in a face-centered cubic matrix phase, and the volume ratio of the body-centered cubic phase is 29.4%, 15.2%, 42.1% and 20.6% respectively. As shown in FIG. 2, the Ni and Al enriched ordered B2 phases of example 3 are dispersed in the Fe and Cr enriched face-centered cubic matrix phase. Wherein, the matrix phase has good plasticity, the B2 phase can prevent dislocation from sliding, and the double-phase structure can realize good strong plastic balance. A drawn sample with a gauge length of 16mm, a cross-sectional dimension of 2.5mm by 1.5mm and a total length of 38mm was cut from the high-entropy alloy sheet by a wire cutting method. Room temperature tensile experiments were performed using an Instron 5582 universal materials tester with a tensile rate of 1 x 10 -3 s -1 The tensile curve of the alloy is shown in figure 3, the room temperature mechanical properties are shown in table 2, the yield strength of the high-entropy alloy embodiment of the invention is above 480MPa, the tensile strength can reach above 780MPa, and the elongation can be kept above 29%. Respectively in the oxygen-deficient (10) -7 wt.%) or saturated oxygen (10) - 3 wt.%) is corroded in liquid lead bismuth at 550 ℃ for 1000 hours, and the section morphology of the corrosion layer of the high-entropy alloy is shown in figures 4-6. It can be seen that the high-entropy alloys of examples 2 to 4 of the present invention did not show corrosion phenomena under saturated oxygen conditions, whereas under lean oxygen conditions, it was found that the high-entropy alloys were gradually corroded to a decreasing extent as the Ni content was reduced.
The implementation result shows that the alloy plate is prepared by an electric arc melting and copper die casting method, and after the alloy plate is subjected to homogenization treatment and rolling deformation, the alloy plate is subjected to annealing and aging treatment, so that the dual-phase structure with a face-centered cubic matrix and a body-centered cubic ordered precipitated phase is obtained, and the special structure enables the alloy to have stronger strong plasticity synergy. In addition, the Fe, cr and Al multilayer oxide film structure formed in the alloy can inhibit the occurrence of soluble corrosion in a lead-bismuth environment, so that the corrosion performance of the alloy is improved, and the alloy has important application prospect.
The examples are preferred embodiments of the present invention, but the present invention is not limited to the above-described embodiments, and any obvious modifications, substitutions or variations that can be made by one skilled in the art without departing from the spirit of the present invention are within the scope of the present invention.
Claims (6)
1. The high-entropy alloy resistant to liquid lead bismuth corrosion is characterized by comprising the following chemical components in percentage by weight:
Fe：42.113~55%；Ni：15~30%；Cr：15~19.711%；Al：5~15%；
the microstructure of the high-entropy alloy is characterized by a face-centered cubic and a body-centered cubic dual-phase structure;
the body-centered cubic phase is an ordered B2-NiAl phase, and is dispersed in the body-centered cubic matrix phase, wherein the volume ratio of the body-centered cubic phase is 5% -30%;
the yield strength of the high-entropy alloy at room temperature is 450-550 MPa, the tensile strength is 750-860 MPa, and the elongation is 25-35%.
2. The liquid lead bismuth corrosion resistant high entropy alloy according to claim 1, wherein the face centered cubic phase is a disordered structural matrix phase enriched in Fe and Cr.
3. A method for preparing the liquid lead bismuth corrosion resistant high entropy alloy according to any one of claims 1 to 2, comprising the steps of:
(1) Weighing raw materials according to a preset component proportion, preparing an alloy ingot by adopting arc melting, and casting into an alloy plate by adopting a copper mold casting method;
(2) And carrying out homogenization treatment, rolling deformation treatment, annealing and aging treatment on the alloy plate to obtain the FeNiCrAl high-entropy alloy.
4. The method for preparing a liquid lead bismuth corrosion resistant high-entropy alloy according to claim 3Characterized in that in the step (1), the vacuum chamber is pre-vacuumized to the air pressure lower than 1 multiplied by 10 -2 Pa, then filling high purity argon gas to make the pressure of vacuum chamber 3 x 10 4 ～9×10 4 Pa, arc melting is carried out, the melting current is 280-500A, and the alloy melt is poured into a copper mold with corresponding size, so that the alloy plate is obtained.
5. The method for preparing the liquid lead-bismuth corrosion-resistant high-entropy alloy according to claim 3, wherein in the step (2), the homogenization treatment temperature is 1000-1250 ℃, the heat preservation time is 1-4 h, and the liquid lead-bismuth corrosion-resistant high-entropy alloy is water-cooled to room temperature; the rolling deformation treatment is room temperature rolling, the alloy plate rotates 180 degrees after each pass of rolling along the length direction, and each pass of rolling is 0.1-0.3 mm until the thickness deformation of the alloy plate is 60% -80%.
6. The method for preparing the liquid lead-bismuth corrosion-resistant high-entropy alloy according to claim 3, wherein in the step (2), the annealing temperature is 900-1100 ℃, the heat preservation time is 0.5-2.5 h, and the alloy is air-cooled to room temperature; the aging temperature is 500-900 ℃, the heat preservation time is 1-500 h, and the water cooling is carried out to the room temperature.
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