Effect of Hot Drawing Process on Mechanical Properties and Superelasticity of TiNi Shape Memory Alloy Wires
Through hot drawing φ0.61 mm Ti-50.8at%Ni alloy after annealing, The mechanical properties and superelasticity of TiNi shape memory alloy wires (from φ0.61mm to φ0.31mm) were tested by tensile test. The effect rule of hot drawing process on the mechanical properties and superelasticity of the wires was studied. The results show that Ti-50.8at%Ni alloy wires after annealing at 650℃ have poor superelasticity , while fracture is elongation greater than 50%. With the increase of total plastic deformation of hot drawing, the superelasticity improves, and the plasticity decreases, when the total plastic deformation of the wires is up to 50%, the values of Δσ vary from 200 to 250 MPa, the remaining strain is less than 0.1%, and the elongation is greater than 10%, which obtains excellent elongation and superelasticity.