The Institute of Materials Research at Tohoku University of Japan has successfully developed a new process for processing titanium-nickel shape memory wires, which is called a wrap--crush extrusion method.
The process of this processing mainly includes the following basic steps:
1. A multilayer composite sheet composed of different metal sheets is prepared by cladding rolling, and the thickness ratio of the various metal layers depends on the determined chemical composition.
2. The rolled composite sheet is cut into pieces, and the chips are filled into a container to form a blank.
3. The blank is extruded into a thin rod and then processed into filaments.
4. The filament is converted into the desired titanium-nickel intermetallic compound wire by thermal diffusion treatment.
By adopting this process, the workability of the composite material can be improved, and the filament having a good microstructure can be obtained at a high reduction rate.
Nickel-titanium memory alloy wire
Nitinol superelas tic wire