94 results about "Phase transition temperature" patented technology

The invention belongs to the field of functional nano materials, and relates to a method for large-scale preparation of monoclinic phase vanadium dioxide nano powder, a heat insulation film and application of the heat insulation film, and large-scale preparation of the monoclinic phase vanadium dioxide nano powder is successfully achieved by combining a coprecipitation method with low-temperature calcination. The obtained product has excellent size uniformity (the average particle size is 65 + / -10 nm) and an adjustable phase change characteristic (61-68 DEG C). The polymer-based composite film prepared based on the nano powder shows excellent optical performance, and the method has the advantages of mild reaction conditions (less than or equal to 600 DEG C), controllable product morphology and phase transition temperature and the like, and provides a reliable solution for industrial production of nano functional materials for intelligent windows.

The invention discloses an anionic surfactant and a preparation method and application thereof.The anionic surfactant has a double-wedge-shaped molecular structure, alkaline earth metal benzene sulfonate serves as a polar hydrophilic wedge tip, a long-chain alkoxy flexible chain segment serves as a hydrophobic wedge group, the surface tension of water can be remarkably reduced in an aqueous solution, and the anionic surfactant has excellent emulsifying capacity. The molecular structure is based on alkaline earth metal benzene sulfonate and has good thermotropic and lyotropic liquid crystallinity, the liquid crystal phase temperature range of the molecular structure exceeds 140 DEG C, and the phase transition temperature and the mesogenic state temperature range can be controlled by adjusting the number of carbon atoms of an alkoxy substituent. When in a mesogenic state, the molecules can form a supramolecular columnar phase through self-assembly aggregation, and the columnar structure can form a transmission channel with ion recognition in the column center direction. By utilizing the characteristic, a novel bionic ion selective conduction membrane can be constructed, and the biomimetic ion selective conduction membrane has wide application potential in the aspects of preparation of ion selective electrodes and chemical sensors and the like.

The invention belongs to the technical field of titanium alloy processing, and particularly relates to a preparation method of a titanium-copper alloy plate. According to the method, high-quality sponge titanium and high-purity electrolytic copper serve as raw materials, a Ti-5Cu alloy plate ingot is formed at a time through an EB electron beam cold bed melting process, volatilization and burning loss of a low-melting-point alloy element Cu are reduced by introducing pure argon or helium protective atmosphere with a certain pressure into a furnace chamber, gas impurities and low-melting-point impurities in the alloy are removed according to the partial pressure principle, and the high-quality sponge titanium and the high-purity electrolytic copper are obtained. The electrode preparation process is omitted, and the production process is simplified. By utilizing the advantages that the Ti-5Cu alloy is small in deformation resistance and good in plasticity when being rolled in a beta-phase region, the Ti-5Cu alloy is rolled in the beta-phase region above the phase transition temperature, it is guaranteed that the deformation amount of the alloy in the beta-phase region reaches 40-90%, and it is avoided that when machining of the beta-phase region is finished, thick grains are reserved in metal, and the mechanical property of the plate is reduced; and a uniform fine grain structure or a basket structure and relatively high mechanical properties can be obtained.

The invention discloses a natural convection-containing solid-liquid phase change prediction method based on LBM and physical information neural network fusion, and belongs to the field of solid-liquid phase change simulation. The problem that an effective scheme capable of reliably and accurately predicting the natural convection-containing solid-liquid phase change process is lacked at present is solved. The method comprises the following steps: constructing a fusion model of an LBM and a physical information neural network, wherein the model comprises a sub-network module and a macroscopic quantity calculation module; constructing a total loss function of the model, wherein the total loss function comprises data loss, equation constraint loss, initial condition loss and boundary condition loss; optimizing network parameters based on a self-adaptive training strategy of the residual error; and inputting a to-be-predicted space-time position coordinate, outputting a distribution function through the trained fusion model, deriving through a macroscopic quantity calculation module to obtain a temperature field, a velocity field and liquid content distribution, and determining a space-time evolution process of the phase change interface based on a mapping relationship between the temperature and the phase change temperature. The method is used in the fields of material processing and energy storage.

Intelligent control of solar transmission through windows promises to reduce energy consumption for thermal comfort in buildings. However, the ability of current smart windows to regulate solar gain based on tunable extinction of phase-change materials is not optimum. A thin-film thermochromic device based on tunable light scattering of hydrogel microparticles of prescribed diameters is reported. In the study, poly (N-isopropylacrylamide)-2-Aminoethylmethacrylate hydrochloride (pNIPAm-AEMA) microparticles are synthesized, with low phase transition temperature ˜32° C. Notably, the average size of pNIPAm-AEMA particles can vary from 1388 nm at 25° C. to 546 nm at 35° C., leading to unprecedented infrared transmittance modulation of 75.6%, in agreement with the numerical simulation based on Mie theory. A high luminous transmittance of 87.2% is accomplished. The pNIPAm-AEMA device demonstrates tunable scattering with excellent stability and scalability, which may find application in a broader field of light management beyond energy-saving smart windows.

The present application relates to a kind of X80 pipeline electric arc additive manufacturing method and system based on thermal-mechanical coupling regulation mechanism, the method includes: first, the continuous cooling transformation curve of X80 steel is determined to determine phase transition temperature interval;Thermal-mechanical coupling finite element model containing mobile heat source and mobile force source is constructed and calibrated;On this basis, process prediction model is established, and the mapping relationship between process parameter and temperature field, stress field is obtained;Optimization algorithm is used in simulation space to carry out reverse optimization, and the optimal thermal-mechanical coupling process parameter combination is obtained;Finally, in actual repair process, deposit layer temperature is monitored in real time by infrared temperature measurement, when temperature falls into phase transition temperature interval and approaches optimal impact intervention temperature, drive with welding ultrasonic impact device to execute mechanical impact.The present application can significantly reduce residual tensile stress and improve the degree of grain refinement.

This invention discloses a room-temperature phase pyroelectric material and its preparation method, relating to the field of pyroelectric material technology, with the chemical formula C4H. 14 N₂OPbCl₄ is prepared as follows: 2-Dimethylaminoethylamine is cooled and stirred in an ice-water bath, then hydrogen peroxide solution is added dropwise while stirring. After the reaction, the resulting reaction solution is vacuum dried to obtain the nitrogen oxide of 2-dimethylaminoethylamine. The nitrogen oxide of 2-dimethylaminoethylamine and lead chloride are added to a concentrated hydrochloric acid solution, heated in an oil bath, and stirred to obtain a pyroelectric material. The pyroelectric material of this invention has a perovskite structure and undergoes a reversible phase transition reaction at a phase transition temperature of 27°C. During the phase transition, a current is generated at the polar axis of the crystal. The phase transition temperature at room temperature allows the pyroelectric material to operate within a relatively stable temperature range, providing reliable energy collection performance and showing great application value in waste heat utilization, self-sustaining systems, and other fields.

The invention belongs to the technical field of shape memory alloys, and particularly relates to a shape memory alloy with excellent high-temperature oxidation resistance and a preparation method and application thereof. According to the provided shape memory alloy, a compact Al2O3 oxide layer and / or high-adhesion chemical bonding can be generated, when Al and Si are added at the same time, tiny pores and grain boundary gaps of the Al2O3 oxide layer are filled with glassy state or fine crystalline state SiO2, and a continuous chemical protection layer of matrix-Ti (Hf)-O-Si-O-Al-Al2O3 is formed through bonding, so that the high-temperature oxidation resistance of the shape memory alloy is obviously improved; hf with a high melting point and a large atomic radius and the use amount of Al and Si can be further regulated and controlled, so that the shape memory alloy has excellent high-temperature oxidation resistance, austenite phase transformation temperature and plasticity comprehensive performance; therefore, the technical problem that an existing Ni-Ti-Hf shape memory alloy is low in high-temperature oxidation resistance is solved.

The application discloses a kind of W-VO2-based middle far infrared spaceflight thermal control multilayer film and its preparation and application method.The film includes aluminium substrate, inorganic medium layer, W-VO2 functional layer and protective layer in turn from bottom to top.The medium layer is used to constitute interference cavity;W-VO2 functional layer is deposited using magnetron sputtering method and is annealed, realizes phase change crystallization and the dynamic control of infrared emissivity;Protective layer is used to protect functional layer from environmental oxidation and mechanical damage, while the influence on infrared performance is limited.By adjusting the proportion of W element doping and the thickness of each layer, the phase transition temperature can be adjusted in the range of 15~68℃, and the emissivity modulation rate of 2~25μm wave band is 0.5-0.7, the visible reflectivity is 0.55-0.65.No obvious oxidation occurs after being placed in air for two weeks.The film has simple structure, controllable preparation process and stable performance, and is suitable for spacecraft cabin, battery panel, optical load and other aspects.

This invention provides a difluoroterminated alkenyl liquid crystal compound, its preparation method, and its application. The difluoroterminated alkenyl liquid crystal compound has the structure shown in the general formula P. The alkenyl-terminated liquid crystal compound of this invention has a large response speed, a large refractive index, a clearing point, and a wide phase transition temperature. Its synthesis method has a high yield, simple post-processing, and is suitable for industrial production.

The invention provides an aerosol generating device which is provided with at least two atomizers, the first atomizer is used for atomizing a first solution, the first solution is provided with a first solvent system, the second atomizer is used for atomizing a second solution, and the second solution is provided with a second solvent system. The first solvent system is different from the second solvent system, and the heating atomization temperature T1 of the first atomizer, the phase change temperature B1 of the first solution, the heating atomization temperature T2 of the second atomizer and the phase change temperature B2 of the second solution meet the following relation: (T1-B1)-(T2-B2) > 0 DEG C. By adopting the scheme, the two atomizers can be respectively controlled to generate aerosols with different particle sizes, and the particle size control accuracy of the aerosols is improved.

A kind of porosity controllable additive manufacturing method of nickel-manganese-tin-cobalt alloy and application of the obtained product.The present application belongs to the field of solid refrigeration.The present application aims at the intrinsic brittleness of nickel-manganese-tin-based alloy,which is difficult to be processed into complex-shaped parts by traditional casting and numerical control processing,limiting its application.Meanwhile,aiming at the problem that the existing additive manufacturing method is easy to produce residual stress and element segregation,which affects the structural integrity and magnetic heat performance of the alloy.The present application uses water-based binder to carry out layer-by-layer spray forming of alloy powder,then adds deoxidizer and manganese powder,and carries out high-temperature sintering under vacuum condition to obtain nickel-manganese-tin-cobalt alloy with controllable porosity.The method of the present application effectively avoids the oxidation of the sample,so that the sample maintains good magnetic-structural characteristics,and obtains nickel-manganese-tin-based alloy with specific porosity,phase transition temperature interval near room temperature,and magnetic heat performance comparable to that prepared by traditional method,which shows broad application prospects in the field of magnetic refrigeration and other fields.

The invention provides a constant-temperature battery, application and an implantable medical device, and relates to the technical field of medical devices. The constant-temperature battery is characterized in that a temperature-sensitive hydrogel layer is grown on the surface of a battery shell in situ, temperature-sensitive hydrogel of the temperature-sensitive hydrogel layer has biocompatibility, and the phase change temperature is 36-39 DEG C. The temperature-sensitive hydrogel with biocompatibility and the phase change temperature of 36-39 DEG C grows on the surface of the battery shell in situ, when the temperature of the battery exceeds the phase change temperature, the hydrogel absorbs heat in a phase change mode, and when the temperature of the battery is lower than the phase change temperature, the hydrogel releases heat in a phase change mode, so that the overall constant temperature is maintained, and the service life of the battery is prolonged. When the battery is used as a power supply of an implantable medical facility, the battery can adapt to the temperature of a human body, does not cause overheating of peripheral tissues, can also adapt to actual use environment adjustment requirements, and can be widely applied to the field of implantable medical instruments.

A method for measuring phase transition temperature using electrical conductivity, comprising: preparing a graph of change in conductivity of molten salts according to temperature, and performing at l

The invention discloses a method and system for recycling magnetic powder in oil-based neodymium iron boron cutting fluid, and belongs to the technical field of neodymium iron boron magnetic material recycling. The method comprises the following steps: feeding oil sludge waste generated by neodymium iron boron processing into a flame-proof magnetic separator, sorting out magnetic sludge, and marking and storing in batches; carrying out thermal performance test on the magnetic mud sample, and determining the volatilization temperature of the oil-based cutting fluid and the neodymium iron boron phase transition temperature; and the magnetic mud is placed in a vacuum furnace, the treatment temperature is set according to a key temperature point measured by thermogravimetry, moisture and cutting fluid impurities are removed through two-step heating treatment under the assistance of high-purity argon, and finally the high-purity neodymium-iron-boron magnetic powder is obtained. The invention further provides a recovery system, the high-performance magnetic powder is directly recovered on the premise of avoiding damage to the main phase structure of neodymium iron boron through a synergistic process of magnetic separation, thermogravimetric analysis and vacuum heat treatment, the problems of resource waste and environmental pollution of a traditional wet process and pyrogenic process recovery process are solved, and green cyclic utilization of magnetic materials is achieved.

The invention discloses a zero sample prediction and numerical phase diagram generation method and system for a creep behavior of a metal material, and belongs to the technical field of digital design and performance prediction of materials. The method comprises the following steps: firstly, constructing a cross-material generality rule mapping relation library, and establishing quantitative correlation among material macroscopic attributes, crystal structures, phase change temperatures, physical mechanism weight distribution and model parameters; for a to-be-predicted target metal material, a preset model and parameters can be called from the relation library only by inputting the crystal structure and the melting point of the to-be-predicted target metal material, a high-precision physical mechanism weighted network prediction model is automatically assembled, and accurate prediction of the creep behavior of the to-be-predicted target metal material in the full stress-temperature domain is achieved. Through continuous calculation and visualization, a quantitative and continuous creep numerical phase diagram with physical interpretability is generated, and competition and evolution of different creep mechanisms are visually revealed. According to the method, normal form transformation from experience fitting to physical prediction is realized, and a core tool is provided for rapid evaluation and digital design of new materials.

The invention discloses a nanoparticle capturing method and related equipment, and the method comprises the following steps: uniformly covering a hydrogel solution on a sample liquid drop containing target nanoparticles on a glass slide to form a standard observation system; the hydrogel solution is temperature sensitive type hydrogel; determining a local area where the target nanoparticles are located in a standard observation system; starting a laser, controlling the laser to irradiate the local area, and regulating and controlling the laser power density of the laser, so that the temperature of the local area reaches and is maintained at the phase change temperature of the hydrogel solution; and adjusting laser parameters of the laser to generate stable hydrogel at the position of the target nanoparticle. According to the embodiment of the invention, the nano-particles can be captured by utilizing the characteristics of the temperature-sensitive hydrogel and combining a simple photo-thermal device, the influence caused by the limitation of capturing environment conditions or capturing sample properties is reduced, and the method can be widely applied to the technical field of nano-particle capturing.

The invention discloses a composite insulating material with strong electrical tree resistance and a self-repairing function and a method. The composite insulating material is composed of a polymer matrix and a saturated fatty acid triglyceride phase change filler dispersed in the polymer matrix. Wherein the saturated fatty acid triglyceride is uniformly dispersed and distributed in the polymer matrix, the grain size, the crystal structure and the crystallinity of the composite material are not obviously different from those of a pure polymer prepared under the same condition, and the melting point of the saturated fatty acid triglyceride is lower than 100 DEG C; when the working temperature of the composite insulating material is lower than the melting point, the composite insulating material exists in a solid state, and the composite insulating material is a solid composite insulator; when the local temperature of the composite insulating material is increased to be higher than the phase change temperature, the saturated fatty acid triglyceride is molten into a liquid state, micro defects or air gaps are filled in situ, and the solid-liquid composite insulating structure with the self-repairing function is formed.

The application provides a SEBS-based liquid crystal elastomer and a preparation method, and belongs to the field of synthesis and application of thermoreversible deformation liquid crystal polymers. The liquid crystal elastomer is a low-crosslinking polymer network prepared by light crosslinking solidification of ethylene-ethylene / butylene-styrene block copolymer SEBS and a main-chain type liquid crystal oligomer with two terminal mercapto groups, is prepared by a two-step crosslinking method, is prepared by a two-step method of PS segment physical domain pre-crosslinking and mercapto-alkene click reaction light crosslinking, and has bidirectional reversible deformation capability. The application realizes the regulation of the phase transition temperature and reversible deformation capability of the polymer material by controlling the content of liquid crystal units and the crosslinking solidification degree; provides a new idea and method for preparing intelligent flexible driver materials with novel functions; and is beneficial to the development of SBS and SEBS materials in the direction of high performance and intelligence based on the liquid crystal polymer network.

The invention discloses a temperature-sensitive polyphenylacetylene chiral nano-microsphere and a preparation method thereof, and relates to the field of chiral materials.The preparation method comprises the steps that firstly, a spiral dendronized polyphenylacetylene copolymer is prepared through coordination copolymerization of two phenylacetylene monomers, then an aqueous solution is prepared and heated to the temperature above the phase change temperature, dehydration aggregation is conducted, and microspheres are formed; and continuously carrying out illumination cross-linking reaction to obtain the chiral nano-microspheres. The method is simple in step and rapid in reaction, and the prepared nano-microspheres have temperature responsiveness, stable chiral characteristics and adjustable particle size, and have good application prospects in the aspects of chiral recognition, chiral separation and the like.

This invention relates to a dioxane-containing negative liquid crystal compound, its preparation method, and its application. The compound has the structure shown in Formula I. The compound prepared by this invention has a large dielectric, a large refractive index, and a clearing point, as well as a wide phase transition temperature. Furthermore, the compound has a short synthesis route, low raw material cost, and simple post-processing, making it suitable for industrial production.

This invention belongs to the field of inorganic nonlinear optical materials technology, and particularly relates to a deep ultraviolet-transmitting potassium scandium sulfate nonlinear optical crystal, its preparation method, and its applications. The crystal has the chemical formula K3Sc(SO4)3, belongs to the monoclinic crystal system, and has different space groups at different temperatures: the space group below 200K is Pc (No. 7), and the space group above 202K is Ia (No. 9). The phase transition temperature of the crystal is between 200 and 202K. The potassium scandium sulfate nonlinear optical crystal of this invention has excellent nonlinear optical performance, with a powder frequency doubling intensity of approximately 1.62 times KDP, a wide transmission range, and a short deep ultraviolet cutoff edge (190 nm), and can achieve frequency-doubled laser output of Nd:YAG (1064 nm) lasers.

The invention discloses a high-enthalpy-value metal-organic coordination material as well as preparation and application thereof, and belongs to the field of phase change energy storage. According to the metal-organic coordination material, transition metal nitrate is coordinated with acethydrazide in a small molecule amide ligand to obtain a series of metal-organic coordination materials. The material realizes the synergistic effect of a hydrogen bond network and a metal coordination bond, so that the material has the advantages of high phase change temperature, large enthalpy value and the like. Compared with a traditional phase change material, the phase change material has excellent thermodynamic property and thermal stability. The device can be applied to the field of heat management of high-power equipment, has the advantages of high energy storage density, low material consumption and the like, and has wide application prospects.

The invention belongs to the technical field of condensed state physics and material research, and particularly relates to a heavy rare earth transition metal oxide magnetocaloric material screening method which comprises the following steps: obtaining zero field cooling of a test sample and a magnetization intensity-temperature curve of the field cooling, and deriving the magnetization intensity-temperature curve of the field cooling to obtain a magnetic field temperature curve of the field cooling; then the absolute value of the derivative of the field cooling magnetization intensity-temperature curve is obtained, and an absolute value curve is obtained; calculating an average magnetic phase transition temperature based on the absolute value curve; calculating the variance of the absolute value curve at the average magnetic phase transition temperature; calculating the dimensionless variance of the absolute value curve based on the variance of the absolute value curve at the average magnetic phase transition temperature; obtaining an isothermal magnetization curve of the test sample and calculating a magnetic entropy change value; and based on the dimensionless variance value, establishing a quantitative relationship between the magnetic phase change interaction intensity and the magnetic entropy change value, and further screening out a target sample. And theoretical support is provided for development and physical mechanism analysis of the low-temperature heavy rare earth based giant magnetocaloric material.

The application discloses a special tubular notch fiber for crack resistance of a concrete floor and a preparation method thereof. The fiber is a three-level composite tubular structure, comprising a shape memory alloy core layer, a biomimetic mineralization intermediate layer and a self-repairing shell layer. The shape memory alloy core layer is a nickel-titanium-copper shape memory alloy, and the phase transition temperature is 30-50 DEG C. The biomimetic mineralization intermediate layer comprises urease and a calcium ion carrier. The self-repairing shell layer is a microcapsule-encapsulated epoxy resin-curing agent system, and the surface of the self-repairing shell layer is provided with multistage micro-nano notches. The tubular notch fiber can intelligently respond according to the crack development stage, and through the synergistic effect of multiple mechanisms such as shape memory effect, ion-induced mineralization, self-repairing release and mechanical anchoring, the multi-scale crack resistance from micro to macro is realized, and the crack resistance and durability of the concrete are significantly improved. Experiments show that the fiber starts repairing when the crack width is 0.1 mm, the repairing rate reaches 92% in 72 hours, and very good technical effects are achieved.

This invention provides a low-temperature magnetocaloric material with the chemical formula: AEuX n Where n = 2.5–3.5; A is selected from one or more of K, Rb, and Cs; X is selected from one or more of F, Cl, Br, and I. The low-temperature magnetocaloric material provided by this invention has a magnetic ordering temperature below 1.8 K, and at 1.8 K, the maximum magnetic entropy change of the material exceeds 5 J / kg under a magnetic field change of 0–2 T. ‑1 K ‑1 Under a magnetic field variation of 0–5 T, the concentration of nitrogen is higher than 15 J / kg. ‑1 K ‑1 By controlling the value of n, A atoms, and X atoms, the phase transition temperature and entropy change of rare-earth halide perovskite materials can be effectively controlled, thereby optimizing the performance of the magnetocaloric materials. The excellent magnetocaloric properties exhibited by these materials demonstrate their potential application in low-temperature magnetic refrigeration.

The application provides a temperature-sensitive self-adjusting light intelligent polymethyl methacrylate composite material and a preparation method thereof, and belongs to the technical field of high polymer materials. The composite material aims to solve the problems of poor compatibility, slow response and insufficient stability of the existing temperature-sensitive polymethyl methacrylate material. The composite material comprises a polymethyl methacrylate matrix and temperature-sensitive polymer chain segments covalently bonded in the matrix; a nanoscale microphase separation structure composed of the temperature-sensitive polymer chain segments is formed in the composite material, so that the material is transparent when the temperature is lower than the phase transition temperature and is scattered when the temperature is higher than the phase transition temperature. The preparation method comprises the following steps: providing a mixture comprising methyl methacrylate, temperature-sensitive comonomers and an initiator. The composite material obtained by the application has the advantages of excellent optical performance, rapid response, cycle stability and integrated multifunction.

The application provides a self-supporting magnetic phase change material manganese arsenic film and a preparation method and application thereof, and relates to the technical field of magnetic functional materials. The self-supporting magnetic phase change material manganese arsenic film is a manganese arsenic film with a polycrystalline structure. The preparation method comprises the following steps: depositing a water-soluble sacrificial layer on the surface of a magnesium oxide single crystal substrate by a pulsed laser deposition method; depositing a manganese arsenic film with a polycrystalline structure on the surface of the sacrificial layer by a magnetron sputtering method; dissolving the water-soluble sacrificial layer to make the manganese arsenic film peel off to form a self-supporting film, and then transferring the self-supporting film to the surface of a new magnesium oxide single crystal substrate to obtain the transferred self-supporting magnetic phase change material manganese arsenic film. The application solves the problem that phase transition temperature drift or magnetic performance attenuation easily occurs in the film peeling and transferring process, and realizes controllable peeling and transferring of a large-area and high-quality film under the premise of ensuring the stoichiometric ratio stability and the integrity of the crystal structure.

A consumer product comprising a liquid conditioning composition comprising a quaternary ammonium alkyl compound, wherein the liquid conditioning composition has a lipid bilayer phase transition temperature (Tm) of at least 25°C, wherein the liquid conditioning composition is contained in a fiber-based container comprising a layer of compressed pulp forming a dimensionally stable shell and enclosing an interior space, wherein the shell is at least partially coated with a layer comprising a polymeric material disposed on an inner surface of the shell adjacent to the interior space.

The invention discloses a NiTiNbTa shape memory alloy material and a preparation method thereof, belongs to the field of shape memory alloy materials, and particularly relates to the NiTiNbTa shape memory alloy material and the preparation method thereof. The invention aims to solve the problems that the traditional NiTiNb wide-lag shape memory alloy is high in cost and the phase transition temperature is difficult to regulate and control. The material comprises 49.5 parts of Ni, 44.5 parts of Ti, 4.5 parts of Nb, 1.5 parts of Ta, 49.5 parts of Ni, 45.5 parts of Ti, 5.5 parts of Nb, 0.5 part of Ta or 49.5 parts of Ni, 45.5 parts of Ti, 5.5 parts of Nb and 1.5 parts of Ta. The method comprises the following steps: carrying out electric arc melting, carrying out solution treatment on a smelted cast ingot, and carrying out water quenching to obtain the alloy with uniform components. The obtained material can obtain remarkable wide thermal hysteresis without depending on complex pre-deformation pretreatment, and also has an excellent shape memory effect. In addition, the phase transition temperature of the alloy can be adjusted through alloy components, and the alloy can be suitable for different application scenes.