Nickel-titanium alloy is a shape memory alloy, which can automatically restore its plastic deformation to its original shape at a certain temperature. Its expansion rate is more than 20%, fatigue life up to 1×10 to the seventh power, damping characteristics than the ordinary spring 10 times higher, its corrosion resistance is better than the current best medical stainless steel, so it can meet all kinds of engineering and medical application requirements, is a very good functional material.
Memory alloy not only has unique shape memory function, but also has excellent characteristics of abrasion resistance, corrosion resistance, high damping and super elasticity.
The tensile strength of Nitinol alloy can reach 1000 MPa. That is to say, every square millimeter needs the force of more than 100 dry grams to be able to pull it on small section like that, the steel strength that is higher than average still is tall, still have very good "memory" performance at the same time 100 and corrosion-resistant performance.
Nitinol alloy contains 50% nickel and 50% titanium, that is, the composition of nickel and titanium is equal in proportion to each other. Its shape memory degree temperature range can be adjusted by controlling the composition. Generally, the higher the nickel content of Nitinol, the lower the operating temperature. Memory alloys work at room temperature when they contain 55% nickel and 45% titanium. People have made use of this feature of memory alloy, made with memory alloy wire to wear the necklace and bracelet, and the use of clip memory alloy wire braided bra. These adornment and health protection article are worn in the body, can restore original degree and stiffness below the action of body temperature, have adornment and health care effect thereby. Additional, still can use nickel titanium alloy to make correct tooth silk, use the person's oral cavity temperature to correct malformed tooth.
