64 results about "Niti alloy" patented technology

The invention discloses a method for predicting phase change temperature of a selective laser melted NiTi alloy based on machine learning, which relates to the technical field of metal material performance prediction, and comprises the following steps: step S1: collecting an initial feature data set of an SLM-NiTi alloy from experiments and literature related to the SLM-NiTi alloy, step S2: performing data preprocessing on the initial feature data set; performing feature screening on a standard feature data set to form a key feature data set; step S3: randomly dividing the key feature data set into a training set and a test set, using a variety of machine learning algorithms, using the screened key features as input features of the model, and using the phase change temperature feature set of the SLM-NiTi alloy as a target feature, constructing multiple SLM-NiTi alloy phase change prediction models, and training them on the training set; step S4: predicting the test set after the training is completed, and obtaining the optimal SLM-NiTi alloy phase change prediction model.

The invention discloses a NiTiNb shape memory alloy and an in-situ alloying preparation method and application thereof. The invention belongs to the technical field of additive manufacturing. The invention aims to solve the technical problems of composition segregation caused by large melting point difference of alloy elements and high reactivity of the elements at high temperature. The method comprises the following steps: firstly, carrying out three-dimensional modeling on a target component, and carrying out slicing treatment; a NiTi alloy wire and a pure Nb wire are used as printing wires, the wire feeding angle, the dry extension length and the relative positions of the double wires are set, the wire feeding angle of the pure Nb wire is larger than the wire feeding angle of the NiTi alloy wire, and the dry extension length of the pure Nb wire extending out of a wire guide nozzle to the center axis of an electron beam is larger than the dry extension length of the NiTi alloy wire extending out of the wire guide nozzle to the center axis of the electron beam; and finally, electron beam fuse wire additive manufacturing parameters are set, and 3D printing is conducted according to slicing data.

The invention relates to a NiTi alloy MIM (metal injection molding) piece preparation method which comprises the following steps: S1, powder preparation: performing ball-milling mechanical mixing on Ni, Ti, Zr and Hf metal powder according to the mass ratio of 58: 38: 2: 2 to obtain mixed powder; the mixed powder is smelted into an ingot, then the ingot is smelted three times in a consumable electrode vacuum furnace, the obtained cast ingot is annealed, the annealed cast ingot is subjected to supersonic gas atomization to form alloy powder, and NiTi alloy powder with the powder particle size D90 smaller than or equal to 20 micrometers is screened out; s2, feed preparation; s3, injection molding; s5, degreasing is conducted; and S6, sintering. Through introduction of Zr and Hf elements, decomposition of a Ni4Ti3 phase can be effectively prevented, and the hardness and fatigue resistance of the NiTi alloy MIM part are effectively improved.

The invention relates to the technical field of medical implants, in particular to a 4D printing-based porous Niti alloy bionic bone gradient structure construction method, which comprises the steps of patient bone data acquisition, bionic gradient model design, NiTi powder preparation, 4D printing, thermal treatment activation of memory effect, surface functionalization treatment and mechanical / biological performance test. The method is characterized by comprising the following preparation steps: accurately acquiring bone structure data through CT / MRI, combining Mimics pretreatment and UG / NX modeling, designing aperture and porosity for differentiation of cortical bone (low porosity of 30%-40%) and cancellous bone (high porosity of 50%-70%), simulating typical load working conditions through ANSYS, enabling the elastic modulus (3-15 GPa) and compressive strength (80-200 MPa) to be close to natural bone, and finally obtaining the bone structure data through the CT / MRI, the pore diameter and porosity of the cortical bone (low porosity of 30%-40%) and the porosity of the cancellous bone (high porosity of 50%-70%). According to the design, the elastic modulus difference between the implant and the host bone is remarkably reduced, the bone resorption problem caused by stress shielding is avoided, meanwhile, continuous porosity transition is achieved through the power gradual change technology, and the structural stability under the complex load is improved.

The invention discloses a small-size NiTi alloy two-way shape memory effect training method which comprises the following steps: processing a NiTi alloy material into a thin strip shape, then performing solution treatment, and immediately performing water quenching; the NiTi alloy material treated in the first step is bent into a W shape at the normal temperature and installed in a constraint mold; the whole mold installed in the second step is placed in a heat treatment furnace to be subjected to aging treatment, after heat preservation is conducted for a certain time, the mold is cooled to the room temperature along with the furnace, a sample fixed to the aging treatment mold is unrestrained to be in a free state, and therefore the whole two-way shape memory effect training process is completed. The size of the W-like cross section at the room temperature is only 10 * 7 mm, the alloy can be applied to a miniature brake, and the two-way shape memory effect deformation rate of the obtained small-size NiTi alloy reaches up to 46.15%.

The invention provides a method for inducing a high-hardness and high-wear-resistance gradient structure 60NiTi alloy through laser quenching, and relates to the technical field of high-nickel NiTi alloy treatment. Laser quenching is adopted for conducting surface treatment on the medium-temperature aging 60NiTi alloy, a gradient structure is constructed, the interior is mainly composed of a TiNi phase and a Ni3Ti phase, good superelasticity of the alloy is kept, high-stress overload impact is borne, the surface layer is mainly composed of a Ni4Ti3 phase and a TiNi phase, high hardness and high abrasion resistance are obtained, the superelasticity is kept, meanwhile, a surface ultrahigh-hardness layer is obtained, and the service life of the alloy is prolonged. And good combination of high wear resistance of the alloy surface layer and high stress impact resistance of the alloy core part is realized.

The invention discloses a method for coating a Ca-Cur submicron modified material-doped PLA layer on the surface of an Ag-DCPD film layer, and relates to the technical field of biological coatings on the surfaces of medical materials. The method comprises the following steps: manufacturing an LPBF-NiTi alloy matrix by adopting a laser powder bed melting additive manufacturing technology, and carrying out pretreatment on the LPBF-NiTi alloy matrix; the pretreated LPBF-NiTi alloy matrix is subjected to electrochemical deposition in an electrolyte solution, and the LPBF-NiTi alloy matrix with the deposited Ag-DCPD film layer is obtained; the preparation method comprises the following steps: dissolving CaCl2 and curcumin in absolute ethyl alcohol, putting the solution into a closed container filled with (NH4) 2CO3, and carrying out constant-temperature reaction to obtain a Ca-Cur submicron modified material; polylactic acid is dissolved in dichloromethane, then the Ca-Cur submicron modified material is dispersed in the dichloromethane, and a leaching solution is obtained; and the LPBF-NiTi alloy matrix on which the Ag-DCPD film layer is deposited is subjected to repeated dipping and pulling in the leaching solution, and the LPBF-NiTi alloy matrix coated with the Ag-DCPD / PLA / Ca-Cur composite film layer is obtained. According to the invention, the corrosion resistance, the biocompatibility and the antibacterial and anti-inflammatory performance of the Ag-DCPD film layer are successfully improved.

The invention discloses a preparation method of a drug-coated stent. The preparation method comprises the following steps: preparing a NiTi alloy shape memory stent; preparing a PMEA-based drug-loaded coating suspension slurry; and coating the prepared PMEA-based drug-loaded coating suspension slurry on the outer surface of the NiTi alloy shape memory stent by adopting a liquid flame spraying mode to obtain the drug-coated stent. The invention also discloses the drug-coated stent prepared by the preparation method and application thereof. The liquid flame spraying technology is used for stent surface modification, the prepared drug-coated stent has a good effect of preventing protein adsorption, bile duct re-blockage and stent failure can be better prevented by combining the drug-coated stent with antibacterial drugs, and the drug-coated stent can be used for clinical treatment of liver and gall diseases.

The invention relates to the technical field of brazing, in particular to a low-temperature preparation method of a nickel-titanium alloy / zirconia ceramic corrosion-resistant joint. In order to solve the problems that an implantable medical device prepared through an existing NiTi shape memory alloy and zirconia ceramic connecting method is poor in biocompatibility and not suitable for long-term service in a human body, the invention provides the NiTi shape memory alloy and zirconia ceramic low-temperature indirect brazing method which is good in biocompatibility and excellent in corrosion resistance. The brazing method comprises the following steps: (1) preparing metallized brazing filler metal; (2) metalizing the zirconia ceramic; (3) brazing the NiTi alloy and the zirconia ceramic; after the obtained joint is subjected to an electrochemical test in SBF simulated body fluid, the corrosion resistance is good; the highest strength of a brazed joint is 31 MPa, and the use strength of an implantable medical device can be met.

The invention belongs to the technical field of electric arc additive manufacturing, and particularly relates to an electric arc additive preparation method of NiTi alloy. The invention provides an electric arc additive preparation method of NiTi alloy, which comprises the following steps of: preparing a NiTi layer on the surface of a NiTi substrate by adopting an electric arc additive process by taking a NiTi alloy wire as a raw material, hammering the NiTi layer, and repeating the operation until a printed piece is obtained. The tensile strength of the obtained alloy is not lower than 715 MPa, the ductility is not lower than 8.2%, and good matching of high strength and excellent ductility is achieved; the preparation method is simple, short in time consumption, safe and environment-friendly, and meets industrial application requirements.

The invention belongs to the field of metal material plastic forming, and particularly relates to a method for preparing a large-linear-elasticity high-strength NiTi shape memory alloy through composite plastic deformation. Comprising the following steps that (1) solid solution quenching treatment is conducted, specifically, a NiTi alloy bar containing 50 at% of Ni and 50 at% of Ti is subjected to solid solution quenching treatment; (2) rotary forging treatment is conducted, specifically, the bar obtained after solution quenching in the step (1) is subjected to room-temperature rotary forging, the deformation of each pass of rotary forging is controlled to be within 2.5%, the total deformation of rotary forging treatment is controlled to be within 20%, and the bar with fine grains of 0.5-5 micrometers is obtained; and (3) room-temperature rolling deformation is conducted, specifically, room-temperature rolling is conducted on the fine-grain bar obtained in the step (2). According to the invention, the nickel-titanium shape memory alloy with high strength, low elastic modulus and large linear elasticity can be prepared; the method is low in cost and high in repeatability, and can be used for large-scale industrial production.

The invention discloses a preparation method of a novel high-performance Ti-Zr-Mo-Sn super-elastic beta titanium alloy. The invention provides a brand-new super-elastic beta titanium alloy system, namely Ti-Zr-Mo-Sn, and preparation of the novel titanium alloy can be achieved by combining the processes of electric arc melting, cold rolling, recrystallization treatment and the like. The preparation method comprises the following specific steps: 1) weighing pure metals such as titanium, zirconium, molybdenum and tin, and preparing a button cast ingot; 2) preparing a standard tensile sample; 3) recrystallization annealing treatment; and 4) mechanical property detection. The problems that NiTi alloy causes allergy and Ti-Nb-based super-elastic beta titanium alloy is poor in mechanical property are solved, and further development of the high-performance biomedical super-elastic beta titanium alloy is promoted.

The application discloses a brazing filler metal for titanium alloy and stainless steel connection and application thereof, and the brazing filler metal comprises an Ag-Cu eutectic brazing filler metal base and NiTi alloy particles. By introducing the NiTi alloy particles into the Ag-Cu eutectic brazing filler metal base, the Ni and Ti in the interface neighborhood are cooperatively involved in diffusion and reaction, the wetting and forming consistency of the brazing filler metal are cooperatively improved, the interface reaction layer is formed into a discrete thin layer, the continuous brittle reaction layer is inhibited from being generated, the risk of crack propagation along the interface is reduced, the shear strength of the brazing filler metal welding joint for titanium alloy and stainless steel connection is remarkably improved, and the forming quality and batch consistency of the brazing joint are improved.

The invention relates to the technical field of medium-entropy alloy, in particular to a medium-entropy alloy composite material and a preparation method and application thereof. The invention provides a medium-entropy alloy composite material, which is prepared from the following raw materials in parts by mass: 70 to 95 parts of CoCrNi medium-entropy alloy and 5 to 30 parts of NiTi alloy, and the crystalline phase of the NiTi alloy comprises a B2 phase. The medium-entropy alloy composite material has high strength, high hardness and high wear resistance at the same time.

This invention relates to a device and process for preparing self-reinforcing and self-healing shape memory composite materials. It innovatively employs a vacuum-assisted injection method to composite and cure epoxy-based shape memory polymers (SMP) with tensioned NiTi shape memory alloy (SMA) wires. The thermotropic shrinkage properties of the NiTi alloy wires are utilized to improve the stiffness of the epoxy matrix while simultaneously healing internal microcracks. This preparation process and supporting equipment can minimize defects in the preparation and use of composite materials and enable semi-automatic control of the composite material's stiffness.

The application discloses a kind of based on NiTi alloy's chip liquid cooling plate flow channel topological optimization design method, comprising: obtaining chip heat source distribution, determine two-dimensional design domain and establish flow-thermal coupling numerical model;Determine material, environment and boundary parameter;Based on solid isotropic material interpolation format, express physical property parameter as the function of design variable, construct topological optimization mathematical model;With minimum fluid viscosity energy dissipation rate and design domain average temperature as joint target, with fluid volume fraction and temperature interval as constraint, carry out iterative solution, obtain two-dimensional optimal flow channel topological configuration.Wherein, NiTi shape memory alloy unit is arranged on the wall surface of flow channel, adaptive flow regulation based on temperature sensing can be realized.The application realizes the collaborative optimization of heat dissipation performance and flow resistance, can effectively suppress hot spot, and design efficiency is high.

The present invention discloses a mold and method for preparing a biomimetic bone radial gradient porous NiTi alloy, comprising the following steps: 1) mold design and assembly; 2) slurry preparation; 3) co-injection molding; 4) curing and drying; 5) degreasing and sintering; and 6) pore-forming agent removal. The biomimetic bone radial gradient porous nickel-titanium alloy prepared by the present invention has a relatively continuous porosity variation from 15% in the outer layer to a maximum of 70% in the inner layer, and an average pore size variation from 30 μm in the outer layer to over 400 μm in the inner layer. The mechanical properties are substantially matched to those of bone. The biomimetic bone radial gradient nickel-titanium alloy prepared by the method of the present invention can be used as an ideal artificial bone tissue repair or replacement material, and is suitable for directly preparing materials such as dental implants, artificial joints, and bone trauma products without the need for subsequent processing.

The invention provides a NiTiHf alloy for an aircraft bearing and a preparation method of the NiTiHf alloy. The method comprises the following steps: smelting Ni, Ti and Hf raw materials according to stoichiometry to obtain an alloy ingot; performing a thermal compression test on the alloy ingot to obtain stress-strain data of the alloy ingot; obtaining an energy dissipation diagram according to the relationship between the energy dissipation factor eta and the temperature as well as the strain rate, and obtaining a rheological instability diagram according to the relationship between the material rheological instability parameter xi and the temperature as well as the strain rate; and according to the energy dissipation diagram and the rheological instability diagram phase, a hot working diagram of the alloy ingot is obtained through superposition, hot working technological parameters of the alloy ingot are determined, and the hot working technological parameters comprise the hot working temperature and the strain rate. According to the method, the hot working parameters of the NiTiHf alloy with the specific stoichiometric ratio can be simply and conveniently determined, and therefore the problem that hot working is difficult due to the fact that the Hf element is introduced into the NiTi alloy can be solved.

The present invention relates to a process for obtaining shape memory metal alloy articles with improved pseudoelastic properties. In particular, said method refers to the thermoforming of semi-finished products made of NiTi-based alloys with improved pseudoelasticity, which can also be modulated, if desired, depending on the technical problem to be solved, in the production of articles (in particular, jewellery) endowed with particular elasticity, but capable of withstanding considerable deformations without, however, giving rise to permanent plastic deformations.

A self-adaptive temperature compensation type large-span arch bridge main arch truss section connecting device belongs to the field of bridge engineering structures, and comprises two groups of SMA (Shape Memory Alloy) elastic gaskets which are clamped between two adjacent main arch truss section flange plates, are symmetrically arranged up and down and are made of shape memory alloys; the prestress tension screws penetrate through the flange plates on the two sides and the SMA elastic gaskets, and high-strength nuts are arranged at the two ends of each prestress tension screw in a matched mode; the two ends of the hydraulic damper are detachably connected with the flange plates of the adjacent sections through spherical hinges respectively; the SMA elastic gasket is a wave-shaped NiTi alloy thin plate; the hydraulic damper has the beneficial effects that the SMA elastic gasket can dynamically absorb and compensate axial displacement caused by thermal expansion and cold contraction, the hydraulic damper can dynamically absorb and compensate radial displacement caused by vibration, accurate initial pre-tightening force can be applied to the SMA gasket by properly tightening the high-strength nut, and the fault-tolerant capability is improved.

The present invention relates to the technical field of arc additive manufacturing, and particularly to a method for additive manufacturing of heterogeneous dual-wire arc of NiTi-based shape memory alloy. The manufacturing method is to feed NiTi alloy wire and metal wire simultaneously through a dual-wire arc additive device, and use an ultra-high frequency pulsed TIG welding power source to realize the additive manufacturing of heterogeneous dual-wire arc of NiTi-based shape memory alloy. The present invention is used to solve problems such as low phase transformation temperature and large phase transformation hysteresis in existing arc additive manufacturing technology. Moreover, the ultra-high frequency pulsed TIG arc can improve the microstructure morphology, thereby being beneficial to stabilizing and improving the performance of NiTi-based alloys, broadening the application fields of NiTi-based ternary alloys, and providing an effective solution for arc additive manufacturing of NiTi-based shape memory alloys.

The utility model discloses a stable type niti alloy vertebral plate structure which comprises a vertebral plate body, connecting plates are fixedly installed on the two sides of the vertebral plate body respectively, an adjusting installation assembly is arranged on one side of each connecting plate, each adjusting installation assembly comprises a clamping groove and a first screw hole, the clamping grooves are formed in one sides of the connecting plates, the first screw holes are formed in one sides of the connecting plates, and the first screw holes are connected with the clamping grooves. A clamping groove is formed in the middle of the vertebral plate, a clamping block is connected to one side of the clamping groove in a clamped mode, a second screw hole is formed in one side of the clamping block, a fixing plate is fixedly installed on one side of the clamping block, a third screw hole is formed in one side of the fixing plate, and a first bolt is connected to the inner side wall of the third screw hole through threads. According to the stable niti alloy vertebral plate structure, adjustment can be carried out according to the condition of the lumbar vertebra of a patient through the arranged adjusting and mounting assembly, the fixing plate of the lumbar vertebra which is not suitable for bolting can be detached so as to prevent the bolt from causing secondary damage to the lumbar vertebra, and the stable niti alloy vertebral plate structure is helpful to the lumbar vertebra of the patient, so that the use effect is better.

The invention belongs to the technical field of preparation of cladding coatings on material surfaces, and particularly relates to a titanium alloy bearing material and a preparation method thereof. The titanium alloy bearing material comprises a titanium alloy substrate and a NiTi alloy coating cladding the titanium alloy substrate, and the NiTi alloy coating is composed of, by mass, 33-40% of Ti and the balance Ni; niTi structures at the joint of the NiTi alloy coating and the titanium alloy substrate are planar crystals and cellular crystals, and the NiTi structures above the joint are columnar crystals and columnar dendritic crystals. The NiTi structure with specific characteristics is formed on the surface of the titanium alloy substrate, the highest hardness reaches 677.41 HV0.2 and is 2.05 times that of the titanium alloy substrate, and the wear resistance is improved by 53% compared with that of the titanium alloy substrate. On the whole, the cladding coating effectively improves the wear resistance and the bearing capacity of the titanium alloy surface.

The application discloses a method for coating a PLA layer of Ag-DCPD film layer surface with doped Ca-Cur submicron modified material, and relates to the technical field of medical material surface biological coating. The method comprises the following steps: an LPBF-NiTi alloy base is manufactured by using a laser powder bed fusion additive manufacturing technology and is pretreated; the pretreated LPBF-NiTi alloy base is subjected to electrochemical deposition in an electrolyte solution to obtain an LPBF-NiTi alloy base with a deposited Ag-DCPD film layer; CaCl2 and curcumin are dissolved in anhydrous ethanol, and are placed in a sealed container containing (NH4)2CO3 for constant-temperature reaction to obtain Ca-Cur submicron modified material; polylactic acid is dissolved in dichloromethane, and then the Ca-Cur submicron modified material is dispersed in the polylactic acid to obtain a leaching solution; the LPBF-NiTi alloy base with the deposited Ag-DCPD film layer is repeatedly immersed and pulled in the leaching solution to obtain an LPBF-NiTi alloy base coated with an Ag-DCPD / PLA / Ca-Cur composite film layer. Through the method, the corrosion resistance, biocompatibility and antibacterial and anti-inflammatory performance of the Ag-DCPD film layer are successfully improved.

The invention provides a porous NiTi alloy and a preparation method thereof, and the preparation method comprises the following steps: (1) screening a pore-forming agent, and uniformly mixing the pore-forming agent with NiTi alloy raw material powder; (2) adding a binder, banburying, granulating, and carrying out mould pressing injection molding to obtain a green body; (3) performing solvent degreasing treatment on the green body, and then performing thermal degreasing; and (4) the degreased green body obtained in the step (3) is subjected to vacuum sintering, and the porous NiTi alloy is obtained. According to the method, metal injection molding is combined with a spherical pore forming agent PMMA, controllable preparation of pore parameters of the porous alloy is achieved by regulating and controlling PMMA powder parameters and the adding proportion, and the evenly-distributed nearly-spherical porous NiTi alloy with different pore diameters and porosity is obtained.

The present invention discloses a method for regulating the mechanical properties of an additive manufactured nickel-titanium alloy component, belonging to the technical field of laser additive manufacturing, and comprising the following steps: Step 1: Prepare a nickel-titanium alloy component through a powder bed powder feeding laser additive manufacturing process; Step 2: Perform heat treatment on the nickel-titanium alloy component. The heat treatment temperature is between 300°C and 550°C, and the heat treatment time is between 0.1 h and 3 h. During the heat treatment, an external load is applied to the nickel-titanium alloy component. The direction of the applied external load is parallel to the forming direction of the nickel-titanium alloy component, and the stress magnitude applied to the nickel-titanium alloy component should be in the range of 0.2 - 10 N / mm<supgt;2< / supgt; to achieve the regulation of the mechanical properties of the nickel-titanium alloy component. This method can effectively regulate the mechanical properties of the nickel-titanium alloy component and further promote the application of the nickel-titanium alloy component in the field of buffer energy absorption.

The invention relates to the technical field of additive manufacturing, in particular to a method for regulating and controlling components of an additive manufacturing NiTi shape memory alloy to enable the components to approach target components. Aiming at the problem that components of the additive manufacturing NiTi shape alloy are unstable, the invention creatively puts forward to establish the relationship between the process parameter and the Ni atom increment, and correspondingly regulates and controls the components of the additive manufacturing NiTi shape alloy by increasing the content of Ni atoms in the second NiTi alloy powder by determining the evaporation capacity of the Ni atoms under the process parameter, so that the additive manufacturing NiTi shape alloy is more stable, and the performance of the additive manufacturing NiTi shape alloy is improved. And the components of the NiTi shape alloy prepared after regulation and control are close to target components.

The utility model discloses a porous structure niti alloy vertebral plate which comprises a vertebral plate body, a limiting groove is formed in the vertebral plate body, a sliding block is connected in the vertebral plate body in a sliding mode, the two sides of the sliding block are connected with the interior of the limiting groove in a sliding mode, a secondary positioning hole is formed in the sliding block, and the secondary positioning hole is connected with the interior of the limiting groove in a sliding mode. End V-shaped recesses are formed in the two ends of the vertebral plate main body, side V-shaped recesses are formed in the two sides of the vertebral plate main body, and a through groove is formed in the vertebral plate main body. According to the niti alloy vertebral plate with the porous structure, the vertebral plate main body is preliminarily fixed through cooperation of second auxiliary positioning holes and screws, then reinforced fixing can be conducted again through cooperation of main positioning holes and screws, and sliding adjustment can be conducted along limiting grooves by sliding sliding blocks; after the sliding block moves to a proper position, key parts can be reinforced through the secondary positioning holes and the screws.

The present invention relates to a strap shoe, such as an ankle strap, a gladiator strap or a foot strap, having an improved fit, comprising an upper (12), a bottom portion (11) to which the upper (12) is fastened, and a strap (14) connected to the bottom portion (11) and / or to the upper (12) and / or incorporated into at least one thereof (11, 12), for fastening the footwear to the foot and / or ankle of a user, and characterised in that the strap (14) comprises at least one strap portion made of a NiTi alloy comprising at least two zones (14a,14b) with different mechanical properties, in particular bending response mechanical properties. The present invention further relates to a process for making a strap shoe.

The invention provides a method for additive manufacturing of a shape memory alloy based on blue laser. The method for additive manufacturing of the shape memory alloy based on the blue laser comprises the following steps that S1, alloy powder is prepared according to a preset molar ratio; s2, the alloy powder in the S1 is dried; s3, a 3D model is established, and a cuboid base body of a pre-printing area is arranged; s4, setting 3D printing parameters; s5, a scanning strategy is set in the cuboid base body, path planning is carried out, and blue laser is selected for scanning; and S6, the dried alloy powder is subjected to laser melting preparation, and the shape memory alloy is obtained. By changing the wavelength, controlling the absorptivity and optimizing parameter control and technological processes in the alloying process, the low-crack, low-hole and multi-dislocation NiTi alloy is obtained, and a new thought and technical support are provided for further development of the NiTi alloy in the medical field.