CN116043069A - Co-V-Ti shape memory alloy with large elastic thermal effect and preparation method thereof - Google Patents
Co-V-Ti shape memory alloy with large elastic thermal effect and preparation method thereof Download PDFInfo
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- 229910001285 shape-memory alloy Inorganic materials 0.000 title claims abstract description 64
- 230000000694 effects Effects 0.000 title claims abstract description 42
- 238000002360 preparation method Methods 0.000 title abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 29
- 239000000126 substance Substances 0.000 claims abstract description 20
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 230000008569 process Effects 0.000 claims abstract description 17
- 238000002844 melting Methods 0.000 claims abstract description 15
- 230000008018 melting Effects 0.000 claims abstract description 15
- 239000000956 alloy Substances 0.000 claims description 65
- 229910045601 alloy Inorganic materials 0.000 claims description 63
- 238000003723 Smelting Methods 0.000 claims description 27
- 239000002994 raw material Substances 0.000 claims description 27
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 24
- 238000001816 cooling Methods 0.000 claims description 14
- 230000009466 transformation Effects 0.000 claims description 13
- 229910052786 argon Inorganic materials 0.000 claims description 12
- 230000008859 change Effects 0.000 claims description 12
- 229910000734 martensite Inorganic materials 0.000 claims description 11
- 239000010453 quartz Substances 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- 238000005303 weighing Methods 0.000 claims description 10
- 238000000265 homogenisation Methods 0.000 claims description 9
- 229910001566 austenite Inorganic materials 0.000 claims description 8
- 230000001681 protective effect Effects 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 7
- 238000009413 insulation Methods 0.000 claims description 6
- 238000007711 solidification Methods 0.000 claims description 6
- 230000008023 solidification Effects 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 5
- 210000001787 dendrite Anatomy 0.000 claims description 4
- 238000005204 segregation Methods 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 2
- 238000011049 filling Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 20
- 238000005057 refrigeration Methods 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 4
- 230000002349 favourable effect Effects 0.000 abstract 1
- 239000012071 phase Substances 0.000 description 10
- 238000012360 testing method Methods 0.000 description 7
- 238000005266 casting Methods 0.000 description 6
- 238000001938 differential scanning calorimetry curve Methods 0.000 description 6
- 238000011068 loading method Methods 0.000 description 6
- 230000007704 transition Effects 0.000 description 6
- 229910004356 Ti Raw Inorganic materials 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000010891 electric arc Methods 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 230000002441 reversible effect Effects 0.000 description 3
- KHYBPSFKEHXSLX-UHFFFAOYSA-N iminotitanium Chemical compound [Ti]=N KHYBPSFKEHXSLX-UHFFFAOYSA-N 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 229910001000 nickel titanium Inorganic materials 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000001755 magnetron sputter deposition Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 239000013077 target material Substances 0.000 description 1
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Abstract
The invention provides a Co-V-Ti shape memory alloy with a large elastic thermal effect and a preparation method thereof, wherein the chemical formula of the shape memory alloy is Co x V y Ti 100‑x‑y (at%) in which x is less than or equal to 40 and less than or equal to 50, y is less than or equal to 29 and less than or equal to 40, and after the invented material is undergone the processes of arc melting and homogenizing heat treatment, it possesses excellent superelasticity, and its product possesses excellent heat-resisting propertyThe Co-V-Ti system shape memory alloy developed by the invention has the advantages of simple preparation process flow, excellent superelastic performance, large elastic heat effect and the like, and is very favorable for practical application of elastic heat refrigeration technology.
Description
[ field of technology ]
The invention relates to the technical field of shape memory alloy, in particular to a Co-V-Ti shape memory alloy with a large elastic thermal effect and a preparation method thereof.
[ background Art ]
The elastic heating refrigeration is realized by utilizing the heat effect generated when the shape memory alloy is subjected to solid-solid phase transition under the drive of stress, has the characteristics of high energy efficiency, large temperature, environmental friendliness and the like, and is considered to be the new technology with the most potential to replace the traditional gas compression refrigeration.
The magnitude of the elasto-thermal effect can generally be quantitatively characterized by the adiabatic temperature change of a material under a stress field. The practical application of the elastic heating refrigeration material not only needs that the material has a large elastic heating effect, but also needs that the preparation and processing technology of the material is simple and the superelastic performance is excellent. Although the traditional Ni-Ti shape memory alloy can generate large heat insulation temperature change of 10-35 ℃, the material preparation usually needs multi-pass cold and hot processing, and has high production cost and complex process. The Fe-based shape memory alloy has simple preparation process and low cost, but has small heat insulation temperature change of about 3-5 ℃ and has no practical value. The patent publication No. CN108486539A discloses a Ti-V-Co shape memory alloy film prepared by the processes of powder mixing, target material preparation, magnetron sputtering, rolling, annealing and the like, however, the preparation process of the Ti-based alloy film is complex, and the Ti-based alloy film does not have stress-induced super-elasticity and elasto-thermal effect.
Although various shape memory alloy materials with large elastic thermal effect have been developed, these materials have disadvantages of complex preparation and processing processes. For example, due to the poor as-cast structure properties of Ni-Ti shape memory alloys, alloy ingots often also require high temperature forging and rolling processes to improve functional properties; in addition, the alloy is easy to crack in the cold and hot working processes, so that the yield is low. Therefore, developing a new material with simple preparation process and large elastic heat effect is still one of the key problems to be solved in the technical field of elastic heat refrigeration.
Accordingly, there is a need to develop a Co-V-Ti shape memory alloy having a large elastic thermal effect and a method of preparing the same to address the deficiencies of the prior art, to solve or alleviate one or more of the problems described above.
[ invention ]
In view of the above, the invention provides a Co-V-Ti shape memory alloy with large elastic thermal effect and a preparation method thereof, the material has excellent super elasticity after arc melting and homogenization heat treatment, and the heat insulation temperature change of 28C can be obtained at the highest when stress is applied.
In one aspect, the present invention provides a Co-V-Ti shape memory alloy having a large elastic thermal effect, the shape memory alloy having the chemical formula Co x V y Ti 100-x-y (at.%) where x is 40.ltoreq.50 and y is 29.ltoreq.40.
In the aspects and any possible implementation manner described above, there is further provided an implementation manner, wherein the microstructure of the shape memory alloy is based on austenite of B2 structure, the volume fraction is not less than 95%, and the rest is non-transformed second phase formed in the solidification process, and the austenite can be transformed into L1 under the driving of temperature or external force 0 The structure is martensitic.
Aspects and any one of the possible implementations as described above, further providing an implementation, co when x=45.5, y=37.5 45.5 V 37.5 Ti 17 The alloy can produce an adiabatic temperature change of 17 ℃ under uniaxial stress.
Aspects and any one of the possible implementations as described above, further providing an implementation, co when x=47, y=35 47 V 35 Ti 18 The alloy can produce an adiabatic temperature change of 20 ℃ under uniaxial stress.
Aspects and any one of the possible implementations as described above, further providing an implementation, co when x=49, y=28 49 V 28 Ti 23 The alloy can generate heat insulation temperature change of 28 ℃ under the action of uniaxial stress。
In aspects and any possible implementation manner as described above, there is further provided a method for preparing a Co-V-Ti shape memory alloy having a large elasto-thermal effect, the method comprising the steps of:
step one, raw material weighing
According to chemical formula Co x V y Ti 100-x-y The mixture ratio of (at%) is respectively weighing Co, V and Ti simple substance raw materials, in the formula, x is more than or equal to 40 and less than or equal to 50, y is more than or equal to 29 and less than or equal to 40;
step two, preparing alloy cast ingots by arc melting
Placing the Co, V and Ti simple substance raw materials weighed in the first step into a non-consumable vacuum arc melting furnace, vacuumizing and filling protective gas; adjusting smelting current to repeatedly overturn and remelt, and cooling to room temperature along with a furnace after smelting to obtain an alloy ingot;
step three, homogenizing heat treatment
And (3) sealing the alloy cast ingot prepared in the step (II) into a quartz tube filled with argon for homogenization heat treatment, and taking out for air cooling to obtain the Co-V-Ti shape memory alloy with the large elastic heat effect.
The aspects and any possible implementation manner as described above further provide an implementation manner, and the step two specifically is: placing the simple substance raw materials of Co, V and Ti weighed in the first step into a non-consumable vacuum arc melting furnace; vacuumizing to 3×10 -3 Pa, then charging protective high-purity argon to 5X 10 4 Pa; adjusting the smelting current to 80-300A for smelting for 5min; repeating the above process, repeatedly turning over and remelting for 4 times, and ensuring that the two times of smelting in the middle are matched with electromagnetic stirring, wherein the stirring time is more than or equal to 15s; and cooling to room temperature along with the furnace after smelting is completed, and obtaining alloy cast ingots.
In the aspects and any possible implementation manner described above, there is further provided an implementation manner, where the third step is specifically: sealing the alloy cast ingot prepared in the second step into a quartz tube filled with argon, performing homogenization heat treatment at 1200 ℃ for 24 hours to eliminate dendrite segregation generated in the solidification process and reduce the non-transformation second phase content, and taking out for air cooling to obtain the Co-V-Ti shape memory alloy with the large elastic heat effect.
In aspects and any one of the possible implementations described above, there is further provided an implementation in which the step of one of the weighed elemental Co, V, ti raw materials is a elemental Co, V, ti raw material having a purity of greater than 99.9 wt.%.
Compared with the prior art, the invention can obtain the following technical effects:
(1) The invention discloses a new Co-V-Ti shape memory alloy material, no report of the shape memory alloy exists in the prior literature and patent, and the alloy has excellent performance and is a brand new high-performance solid-state refrigerating material;
(2) The Co-V-Ti shape memory alloy can generate heat insulation temperature change of 28 ℃ to the maximum under the induction of stress, has excellent super elasticity, can completely recover to an initial state after stress is unloaded, and is very beneficial to long-service life of a thermal elastic refrigerating material under cyclic load;
(3) The preparation process of the Co-V-Ti shape memory alloy only comprises arc melting and homogenization heat treatment, and the preparation process is simple, so that the production and manufacturing cost of the alloy is greatly reduced.
Of course, it is not necessary for any of the products embodying the invention to achieve all of the technical effects described above at the same time.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is Co prepared in example 1 45.5 V 37.5 Ti 17 DSC profile of shape memory alloy;
FIG. 2 is Co prepared in example 1 45.5 V 37.5 Ti 17 Shape memory alloy XRD profile;
FIG. 3 is Co prepared in example 1 45.5 V 37.5 Ti 17 Microstructure profile of the shape memory alloy;
FIG. 4 is Co prepared in example 1 45.5 V 37.5 Ti 17 A compressive stress-strain curve of the shape memory alloy;
FIG. 5 is Co prepared in example 1 45.5 V 37.5 Ti 17 Shape memory alloy at 33.33s -1 A graph of temperature over time during rapid unloading at a rate of (2);
FIG. 6 is Co prepared in example 2 47 V 35 Ti 18 DSC profile of shape memory alloy;
FIG. 7 is Co prepared in example 2 47 V 35 Ti 18 A compressive stress-strain curve of the shape memory alloy;
FIG. 8 is Co prepared in example 2 47 V 35 Ti 18 Shape memory alloy at 33.33s -1 A plot of sample surface temperature over time during rapid unloading at a rate of (2);
FIG. 9 is Co prepared in example 3 49 V 28 Ti 23 DSC profile of shape memory alloy;
FIG. 10 is Co prepared in example 3 49 V 28 Ti 23 A compressive stress-strain curve of the shape memory alloy;
FIG. 11 is Co prepared in example 3 49 V 28 Ti 23 Shape memory alloy at 33.33s -1 A plot of sample surface temperature over time during rapid unloading at a rate of (c).
[ detailed description ] of the invention
For a better understanding of the technical solution of the present invention, the following detailed description of the embodiments of the present invention refers to the accompanying drawings.
It should be understood that the described embodiments are merely some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
Example 1:
this example prepares Co with the large elastic thermal effect 45.5 V 37.5 Ti 17 (at.%) shape memory alloy. The method specifically comprises the following steps:
step one, raw material weighing
Grinding simple substance raw materials with purity not less than 99.9wt.% to remove oxide skin, cleaning, and then carrying out chemical formula Co according to the alloy 45.5 V 37.5 Ti 17 Proportioning, and respectively weighing Co, V and Ti simple substance raw materials.
Step two, preparing alloy cast ingots by arc melting
Placing the Co, V and Ti raw materials weighed in the first step into a non-consumable vacuum arc melting furnace; vacuumizing to 3×10 - 3 Pa, then charging protective high-purity argon to 5X 10 4 Pa; adjusting the smelting current to 80-300A, smelting the raw materials into button ingots by utilizing a high-temperature electric arc, wherein the single smelting time lasts for 5min; in order to ensure the components of the alloy to be uniform, the ingot casting is required to be repeatedly turned over and remelted for 4 times, and the two smelting processes in the middle are matched with electromagnetic stirring, and the stirring time is more than or equal to 15 seconds; and cooling to room temperature along with the furnace after smelting is completed, and obtaining alloy cast ingots.
Step three, homogenizing heat treatment
Sealing the alloy cast ingot prepared in the second step into a quartz tube filled with argon, placing the quartz tube into a box-type resistance furnace, performing homogenization heat treatment at 1200 ℃ for 24 hours to eliminate dendrite segregation generated in the solidification process and reduce the content of non-transition second phases, taking out and air cooling to obtain Co with large elastic heat effect 45.5 V 37.5 Ti 17 And (3) casting a shape memory alloy ingot.
Co to be obtained 45.5 V 37.5 Ti 17 Shape memory alloy castingThe ingot was cut out by wire cutting to a size of Φ3X1 mm 3 For testing whether the alloy has a thermoelastic martensitic transformation; cut out phi 3X 6mm 3 For mechanical and thermal performance testing, the equipment used was an Instron 5966 electronic universal tester.
FIG. 1 is an inventive Co 45.5 V 37.5 Ti 17 DSC curve of alloy, when increasing/decreasing temperature, curve has heat absorption/heat release peak corresponding to thermoelastic martensitic transformation, which shows that the prepared material is shape memory alloy. The alloy has thermoelastic martensitic transformation, which is a precondition for obtaining superelasticity and elasto-thermal effects.
The XRD test results in FIG. 2 show Co 45.5 V 37.5 Ti 17 The austenite of the shape memory alloy has a B2 structure. Austenite of B2 structure can be converted into L1 in the phase change process 0 The martensite of the structure, the transformation process can produce large entropy changes. The phase transition entropy calculated by DSC curve becomes 26.2J/kg.K, the theoretical adiabatic temperature becomes 17.2 ℃, co 45.5 V 37.5 Ti 17 Shape memory alloys will have a large elasto-thermal effect.
FIG. 3 is a graph showing the microstructure of an alloy in which the volume fraction of B2 austenite is about 97%, a small amount of second phase incapable of producing reversible transformation is distributed in the grain boundaries and the grain boundaries, and a high austenite content ensures a high phase transformation volume fraction of the alloy, which is advantageous for obtaining fully reversible superelasticity and a large elasto-thermal effect.
FIG. 4 is a compressive stress-strain curve for an inventive alloy with a loading/unloading rate of 5.7X10 -4 s -1 The alloy had a superelasticity of 3.9% and a strain recovery of 100% after unloading. Excellent superelasticity is a precondition for alloys to achieve large elastic thermal effects and practical engineering applications.
FIG. 5 is a graph showing the elasto-thermal effect of the component alloy, at first at 5.7X10 -4 s -1 Loading the material to 1000MPa at a speed of 33.33s after 25s of preserving the material -1 The stress is rapidly unloaded at a rate, the alloy undergoes reverse martensitic transformation, the temperature is rapidly reduced, and the measured adiabatic temperature becomes 17 ℃ and the performance is superior to that of most shape memory alloys.
Example 2
This example prepares Co with the large elastic thermal effect 47 V 35 Ti 18 (at.%) shape memory alloy. The method specifically comprises the following steps:
step one, raw material weighing
Grinding simple substance raw materials with purity not less than 99.9wt.% to remove oxide skin, cleaning, and then carrying out chemical formula Co according to the alloy 47 V 35 Ti 18 Proportioning, and respectively weighing Co, V and Ti simple substance raw materials.
Step two, preparing alloy cast ingots by arc melting
Placing the Co, V and Ti raw materials weighed in the first step into a non-consumable vacuum arc melting furnace; vacuumizing to 3×10 - 3 Pa, then charging protective high-purity argon to 5X 10 4 Pa; adjusting the smelting current to 80-300A, smelting the raw materials into button ingots by utilizing a high-temperature electric arc, wherein the single smelting time lasts for 5min; in order to ensure the components of the alloy to be uniform, the ingot casting is required to be repeatedly turned over and remelted for 4 times, and the two smelting processes in the middle are matched with electromagnetic stirring, and the stirring time is more than or equal to 15 seconds; and cooling to room temperature along with the furnace after smelting is completed, and obtaining alloy cast ingots.
Step three, homogenizing heat treatment
Sealing the alloy cast ingot prepared in the second step into a quartz tube filled with argon, placing the quartz tube into a box-type resistance furnace, performing homogenization heat treatment at 1200 ℃ for 24 hours to eliminate dendrite segregation generated in the solidification process and reduce the content of non-transition second phases, taking out and air cooling to obtain Co with large elastic heat effect 47 V 35 Ti 18 And (3) casting a shape memory alloy ingot.
Co to be obtained 47 V 35 Ti 18 The shape memory alloy cast ingot is cut out to be phi 3 multiplied by 1mm by linear cutting 3 For testing whether the alloy has a thermoelastic martensitic transformation; cut out phi 3X 6mm 3 For mechanical and thermal performance testing, the equipment used was an Instron 5966 electronic universal tester.
FIG. 6 is an inventive Co 47 V 35 Ti 18 DSC curve of alloy, when increasing/decreasing temperature, curve has heat absorption/heat release peak corresponding to thermoelastic martensitic transformation, which shows that the prepared material is shape memory alloy. The phase transition entropy calculated by DSC curve becomes 29.9J/kg.K, the theoretical adiabatic temperature becomes 22.1 ℃, co 47 V 35 Ti 18 Shape memory alloys will have a large elasto-thermal effect.
FIG. 7 is a compressive stress-strain curve for an inventive alloy with a loading/unloading rate of 5.7X10 -4 s -1 The alloy had a superelasticity of 3.3% and a strain recovery of 100% after unloading. Excellent superelasticity is a precondition for alloys to achieve large elastic thermal effects and practical engineering applications.
FIG. 8 is a graph showing the elasto-thermal effect of the component alloy, at first at 5.7X10 -4 s -1 Loading the material to 650MPa at a rate of 33.33s after 25s of preserving the material -1 The stress is rapidly unloaded at a rate and the alloy temperature drops rapidly and the measured adiabatic temperature becomes 20 c due to the stress induced superelasticity of the alloy.
Example 3
This example prepares Co with the large elastic thermal effect 48 V 29 Ti 23 (at.%) shape memory alloy. The method specifically comprises the following steps:
step one, raw material weighing
Grinding simple substance raw materials with purity not less than 99.9wt.% to remove oxide skin, cleaning, and then carrying out chemical formula Co according to the alloy 49 V 28 Ti 23 Proportioning, and respectively weighing Co, V and Ti simple substance raw materials.
Step two, preparing alloy cast ingots by arc melting
Placing the Co, V and Ti raw materials weighed in the first step into a non-consumable vacuum arc melting furnace; vacuumizing to 3×10 - 3 Pa, then charging protective high-purity argon to 5X 10 4 Pa; adjusting the smelting current to 80-300A, smelting the raw materials into button ingots by utilizing a high-temperature electric arc, wherein the single smelting time lasts for 5min; in order to ensure the components of the alloy to be uniform, the ingot casting is required to be repeatedly turned over and remelted for 4 times, and the two smelting processes in the middle are matched with electromagnetic stirring, and the stirring time is more than or equal to 15 seconds; cooling to room temperature along with the furnace after smelting is completed to obtainObtaining alloy cast ingots.
Step three, homogenizing heat treatment
Sealing the alloy cast ingot prepared in the second step into a quartz tube filled with argon, placing the quartz tube into a box-type resistance furnace, performing homogenization heat treatment at 1200 ℃ for 24 hours, and taking out for air cooling to obtain Co with large elastic heat effect 49 V 28 Ti 23 And (3) casting a shape memory alloy ingot.
Co to be obtained 49 V 28 Ti 23 The shape memory alloy cast ingot is cut out to be phi 3 multiplied by 1mm by linear cutting 3 For testing whether the alloy has a thermoelastic martensitic transformation; cut out phi 3X 6mm 3 For mechanical and thermal performance testing, the equipment used was an Instron 5966 electronic universal tester.
FIG. 9 is an inventive Co 49 V 28 Ti 23 DSC curve of alloy, when increasing/decreasing temperature, curve has heat absorption/heat release peak corresponding to thermoelastic martensitic transformation, which shows that the prepared material is shape memory alloy. The phase transition entropy calculated by DSC curve becomes 36.5J/kg.K, the theoretical adiabatic temperature becomes 28.1 ℃, co 49 V 28 Ti 23 Shape memory alloys will have a large elasto-thermal effect.
FIG. 10 is a compressive stress-strain curve for an inventive alloy with a loading/unloading rate of 5.7X10 -4 s -1 The alloy had a superelasticity of 4.2% and a strain recovery of 100% after unloading. Excellent superelasticity is a precondition for alloys to achieve large elastic thermal effects and practical engineering applications.
FIG. 11 is a graph showing the elasto-thermal effect of the component alloy, at first at 5.7X10 -4 s -1 Loading the material to 1000MPa at a speed of 33.33s after 25s of preserving the material -1 The stress is rapidly unloaded at a rate and the alloy temperature drops rapidly, thanks to the stress-induced superelasticity of the alloy, the measured adiabatic temperature becoming 28 ℃.
The Co-V-Ti shape memory alloy with the large elastic thermal effect and the preparation method thereof provided by the embodiment of the application are described in detail. The above description of embodiments is only for aiding in understanding the method of the present application and its core ideas; meanwhile, as those skilled in the art will have modifications in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.
Certain terms are used throughout the description and claims to refer to particular components. Those of skill in the art will appreciate that a hardware manufacturer may refer to the same component by different names. The description and claims do not take the form of an element differentiated by name, but rather by functionality. As referred to throughout the specification and claims, the terms "comprising," including, "and" includes "are intended to be interpreted as" including/comprising, but not limited to. By "substantially" is meant that within an acceptable error range, a person skilled in the art is able to solve the technical problem within a certain error range, substantially achieving the technical effect. The description hereinafter sets forth the preferred embodiment for carrying out the present application, but is not intended to limit the scope of the present application in general, for the purpose of illustrating the general principles of the present application. The scope of the present application is defined by the appended claims.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a product or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such product or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a commodity or system comprising such elements.
It should be understood that the term "and/or" as used herein is merely one relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
While the foregoing description illustrates and describes the preferred embodiments of the present application, it is to be understood that this application is not limited to the forms disclosed herein, but is not to be construed as an exclusive use of other embodiments, and is capable of many other combinations, modifications and environments, and adaptations within the scope of the teachings described herein, through the foregoing teachings or through the knowledge or skills of the relevant art. And that modifications and variations which do not depart from the spirit and scope of the present invention are intended to be within the scope of the appended claims.
Claims (10)
1. A Co-V-Ti shape memory alloy with large elastic thermal effect is characterized in that the chemical formula of the shape memory alloy is Co x V y Ti 100-x-y (at.%) where x is 40.ltoreq.50 and y is 29.ltoreq.40.
2. The shape memory alloy of claim 1, wherein the microstructure of the shape memory alloy is based on austenite of B2 structure, the volume fraction is not less than 95%, and the rest is a non-transformed second phase formed by solidification, which austenite is transformed into L1 under the drive of temperature or external force 0 The structure is martensitic.
3. Shape memory alloy according to claim 1, characterized in that when x=45.5, y=37.5, co 45.5 V 37.5 Ti 17 The alloy can produce an adiabatic temperature change of 17 ℃ under uniaxial stress.
4. Shape memory alloy according to claim 1, characterized in that when x=47, y=35, co 47 V 35 Ti 18 The alloy can produce an adiabatic temperature change of 20 ℃ under uniaxial stress.
5. Shape memory alloy according to claim 1, characterized in that when x=49, y=28, co 49 V 28 Ti 23 The alloy can generate heat insulation temperature change of 28 ℃ under the action of uniaxial stress.
6. A method for preparing a Co-V-Ti shape memory alloy having a large elasto-thermal effect according to any one of claims 1 to 5, comprising the steps of:
step one, raw material weighing
According to chemical formula Co x V y Ti 100-x-y The mixture ratio of (at%) is respectively weighing Co, V and Ti simple substance raw materials, in the formula, x is more than or equal to 40 and less than or equal to 50, y is more than or equal to 29 and less than or equal to 40;
step two, preparing alloy cast ingots by arc melting
Placing the Co, V and Ti simple substance raw materials weighed in the first step into a non-consumable vacuum arc melting furnace, vacuumizing and filling protective gas; adjusting smelting current to repeatedly overturn and remelt, and cooling to room temperature along with a furnace after smelting to obtain an alloy ingot;
step three, homogenizing heat treatment
And (3) sealing the alloy cast ingot prepared in the step (II) into a quartz tube filled with argon for homogenization heat treatment, and taking out for air cooling to obtain the Co-V-Ti shape memory alloy with the large elastic heat effect.
7. The method according to claim 6, wherein the second step is specifically: placing the simple substance raw materials of Co, V and Ti weighed in the first step into a non-consumable vacuum arc melting furnace; vacuumizing to 3×10 -3 Pa, then charging protective gas to 5×10 4 Pa; adjusting the smelting current to 80-300A for smelting for 5min; repeating the above process, repeatedly turning over and remelting for 4 times, and ensuring that the two times of smelting in the middle are matched with electromagnetic stirring, wherein the stirring time is more than or equal to 15s; and cooling to room temperature along with the furnace after smelting is completed, and obtaining alloy cast ingots.
8. The method according to claim 7, wherein the third step is specifically: sealing the alloy cast ingot prepared in the second step into a quartz tube filled with argon, performing homogenization heat treatment at 1200 ℃ for 24 hours to eliminate dendrite segregation generated in the solidification process and reduce the non-transformation second phase content, and taking out for air cooling to obtain the Co-V-Ti shape memory alloy with the large elastic heat effect.
9. The method according to claim 6, wherein the Co, V, ti elemental raw materials weighed in the step one are all Co, V, ti elemental raw materials having a purity of more than 99.9 wt.%.
10. The method according to claim 7, wherein the protective gas in the second step is high purity argon.
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| CN106834810A (en) * | 2017-01-19 | 2017-06-13 | 厦门大学 | A kind of cobalt vanadium aluminium high-temperature shape memory alloy and preparation method thereof |
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| CN106834810A (en) * | 2017-01-19 | 2017-06-13 | 厦门大学 | A kind of cobalt vanadium aluminium high-temperature shape memory alloy and preparation method thereof |
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