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

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 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 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.