A project alloy with unique shape memory was discovered by William J. Buehlerand Frederick Wang at the lab of United Stated Navy in 1958,which is Ni-Ti shape memory alloy was named Nitinol . A project alloy with unique shape memory was discovered by William J. Buehlerand Frederick Wang at the lab of United Stated Navy…
Austenite- the high temperature parent phase of the Nitinol alloy having a B2 crystal structure; Austenite finish temperature (Af)-the temperature at which martensite (or R-phase) to austenite，transformation is completed on heating of the alloy; Austenite start temperature (As)- Austenite start temperature (As); Free recovery- unconstrained motion of a shape memory alloy upon heating and transformation…
Why we called it as Nitinol? Nitinol is taken from the elements of—nickel (Ni) and titanium (Ti)—and the scientific group that discovered it—the Naval Ordnance Laboratory (NOL). A team from the NOL discovered the alloy while searching for materials that could be used in tools for dismantling magnetic mines.
What are the most popular applications of Nitinol(SMA)? Nitinol shape memory alloys have been widely used: A.Industrial B.Aerospace C.Medical D.Toys E.Training Aids F.Automatic control science and other several of enterprises at home and abroad.However, since the increasing performance requirements and size restrictions, here we need to develop high stiffness nickle and titanium shape memory alloys.
Nitinol alloy might be used coupling, biomedical and medical, toys and novel items, brake, heat engine, transducer, low temperature active model and inter slot, lifting equipment.
Nitinol alloy has such special property because of its own transformation, a mechanical stress from 10,000 to 20,000 psi was produced between the two different phase transitions of crystals.
1.shape memory feature a heating change process. a certain shape parent phase cool from Af to Mf,then heating it from Mf to Af, which shall remain it original shape. 2. Superelastic don’t comply with Hooke’s Law, which can show stronger strength than other material. 3. Sensitive at intraoral environment as Arch wire for tooth orthodontics,…
Following information are from standard nitinol: 76 x10 6Ωcm (martensite) Heating conducting:0.18 W / cmoC(austenite) 0.086 W / cmoC (martensite) Thermal expansivity:11 x10 6 / oC (austenite) 6.6 x10 6 / oC (martensite) Magnetic permeability :< 1.002 Magnetic susceptibility: 3.7 x10 6 emu / g(austenite) 2.4 x10 6 emu / g(martensite) Elasticity modulus: 75 –…
A project alloy with unique shape memory was discovered by William J. Buehler and Frederick Wang at the lab of United Stated Navy in 1958,which is Ni-Ti shape memory alloy was named Nitinol . A project alloy with unique shape memory was discovered by William J. Buehler and Frederick Wang at the lab of United…
Nitinol also called NiTi alloy Melting point 1310 ℃ Density:6.45g/cm³ Resistivity: 82 x10 6Ωcm(austenite)