8 results about "Magnetic shape-memory alloy" patented technology

The present invention discloses a multi-stimulus shape memory color change dual-response 3D printing structural part and its preparation method, the preparation method comprises the following steps: step 1, PCL powder, TPU powder, color-changing microcapsule three kinds of particles, mechanically stirring and mixing to obtain a mixed pellet; step 2, the mixed pellet is added to a single screw extruder to prepare a 3D printing composite wire; step 3, the composite wire prepared in step 2 is used, magnetic shape memory alloy fiber is introduced as a continuous conductive fiber, and the composite wire and the magnetic shape memory alloy fiber are compounded together by an improved 3D printer to prepare a 3D printing structural part with shape memory and color change dual response. Based on traditional polymer materials, the present invention designs and develops PCL / TPU / MC shape memory color change dual-response 3D printing composite wire, prepares electrothermal, hydrothermal and magnetic stimulation shape memory color change dual-response PCL / TPU / MC@MSMA 3D printing structural parts, which greatly improves the intelligence of 3D printing structural parts.

The application discloses a high-damping Ni-Co-Mn-Sn magnetic shape memory alloy and a preparation method thereof. 45 Co5Mn 43‑x Sn 7+x , wherein x=0-3, and the preparation method comprises the following steps: taking nickel, cobalt, manganese and tin according to the stoichiometric ratio of Ni 45 Co5Mn 43‑x Sn 7+x , respectively, mixing and vacuum smelting, continuing smelting after inert gas is filled, and finally casting to obtain the high-damping Ni-Co-Mn-Sn magnetic shape memory alloy. The high-damping Ni-Co-Mn-Sn magnetic shape memory alloy prepared by the method has the advantages of simple preparation method, low raw material price, saved alloy preparation cost, adjustable phase transition temperature of the alloy through the change of the Mn and Sn content, good controllability, high phase transition temperature of the prepared alloy, promoted formation of more martensite structure, and good damping performance.

The utility model discloses a fast operation low-voltage switch used for an AI intelligent switch cabinet, which relates to the technical field of low-voltage switches and comprises a moving contact, a magnetic control shell is arranged on the moving contact, a magnetic control mechanism is arranged in the magnetic control shell, an opening handle used for rotating opening is arranged at the front end of the magnetic control shell, the magnetic control mechanism comprises a coil, and the coil is arranged in the magnetic control shell. The magnetic control operating mechanism comprises a coil, a magnetic yoke is arranged on the coil, a magnetic control semi-hard magnetic memory alloy is arranged on the circumferential surface of the magnetic yoke, a movable iron core is installed between the coil and the magnetic yoke in a sliding mode, and rapid closing or opening of the magnetic control operating mechanism can be achieved only by conducting current in a specific direction in the coil. Compared with a traditional molded case circuit breaker operating mechanism, the magnetic control operating mechanism is simple in structure, few in moving parts and high in mechanical reliability. Meanwhile, the magnetic control operating mechanism is short in opening and closing action time, the closing time is less than or equal to 10ms, and the opening time is less than or equal to 5ms, so that the breaking capacity is stronger, and the performance is more stable.

The application discloses a kind of magnetic shape memory alloy high-frequency force-thermal-magnetic-electric coupling dynamic response prediction method, equipment and medium, method includes: the first Hamiltonian action functional of magnetic shape memory alloy sample without considering thermal effect is established;According to the first Hamiltonian action functional, the first control equation group of magnetic shape memory alloy sample is derived;The second Hamiltonian action functional of magnetic shape memory alloy sample considering thermal effect is established, and the heat conduction equation is obtained according to the second Hamiltonian action functional;According to control equation group and heat conduction equation, the second control equation group of model is constructed, and the prediction result is obtained by solving the second control equation group.The scheme proposed in the present application considers the influence of temperature, as well as the influence of the excitation magnetic field generated under high-frequency magnetic field loading conditions, fully simulates the force-thermal-magnetic-electric coupling dynamic response of magnetic shape memory alloy under high-frequency force magnetic coupling loading conditions, and has important application prospect and value.

The invention discloses a method for preparing lattice-configuration magnetic shape memory alloy with excellent magnetic refrigeration performance through extrusion forming and two-section type degreasing, and belongs to the technical field of metal material additive manufacturing. The problems that when an existing binder-related additive manufacturing method is used for preparing the magnetic shape memory alloy, the component stability is poor, and the time cost is high are solved. The method comprises the following steps: 1, preparing slurry; 2, printing; and 3, sintering. The method is used for preparing the lattice-configuration magnetic shape memory alloy with excellent magnetic refrigeration performance through extrusion forming and two-section type degreasing.

This application discloses a high-frequency isothermal actuator and flapping wing device based on magnetic shape memory alloy, including a drive box, a fixed hinge, a movable hinge, and a bionic wing. In this application, two pairs of electromagnets are installed in four directions on the magnetic shape memory alloy rod. Compared to using springs in a magnetic shape memory alloy actuator, this achieves rapid extension and retraction of the magnetic shape memory alloy rod, resulting in higher drive precision and speed. The design is simple, avoiding the impact of excessive heat generation on the drive effect in traditional actuators or flapping wing devices, and also avoiding the complex structural design of traditional flapping wing aircraft.

The invention provides a polycrystalline ferromagnetic shape memory alloy with high cold workability and a preparation method thereof, the chemical formula of the polycrystalline ferromagnetic shape memory alloy is Fe44Mn28Ga28, and the polycrystalline ferromagnetic shape memory alloy comprises a gamma phase structure and a B2 phase structure. The polycrystalline ferromagnetic shape memory alloy provided by the invention has excellent cold working performance and ductility, the fracture strain is improved, the mechanical performance of the material is improved, the content of the gamma-phase structure is quantitatively regulated through stress induction so as to regulate the influence of the gamma-phase structure on the martensite transformation temperature and magnetic performance, and on the basis of improving the mechanical strength, the mechanical performance of the material is improved. The influence of the gamma phase structure on martensite transformation temperature and magnetic performance is controlled within a certain range.

The embodiment of the invention provides a magnetic shape memory alloy dynamic response prediction method based on a continuous variable model and related equipment, and belongs to the technical field of magnetic shape memory alloy materials. The method comprises the following steps: firstly, establishing a Hamiltonian action functional of a magnetic shape memory alloy sample, wherein the functional introduces two continuous internal variable fields to jointly characterize variant distribution and lattice rotation in the material; then, deriving a weak form of a control equation set by performing variation calculation on a functional, and simplifying the control equation set based on a lattice feature direction to obtain an efficient model only depending on a displacement field and a variant volume fraction variable; and finally, implanting the weak form of the control equation set into finite element software for solving, and predicting the dynamic mechanical response of the magnetic shape memory alloy under the high-frequency external force. The physical significance of the model is clear, nucleation, migration and combination of variants can be simulated in the whole process without presetting a twin crystal interface, and the calculation efficiency is remarkably improved while the precision is guaranteed.