GB 24627-2009/ ASTM F2063-18
Wrought nickel titanium shape memory alloy labels for medical devices and surgical implants.
Standard specification for seamless nickel titanium memory alloy fittings for medical devices and surgical implants.
Standard terminology for nickel titanium shape memory alloys.
Standard test method for testing the transition temperature of nickel titanium alloys using thermal analysis.
Tensile testing method for nickel titanium hyperelastic materials.
Standard test method for phase transition temperature of nickel titanium shape memory alloys using bending and free recovery methods.
Black surface oxidation state
Light oxidation state (from golden yellow to brown)
Super bright state ®
Shape memory shape memory is that when the parent phase of a certain shape is cooled from above Af temperature to below Mf temperature to form martensite, martensite is deformed below Mf temperature and heated to below Af temperature. With reverse phase transformation, the material will automatically restore its shape in the parent phase. In fact, the shape memory effect is a thermally induced transformation process of NiTi alloy.
Superelasticity refers to the phenomenon where a specimen produces a strain far greater than the elastic limit strain under external force, and the strain can automatically recover during unloading. That is, in the parent phase state, due to the effect of external stress, stress induced martensite transformation occurs, so the alloy shows different mechanical behavior from ordinary materials, its elastic limit is far greater than ordinary materials, and no longer obeys Hooke's Law. Compared to shape memory properties, hyperelasticity has no thermal involvement. In summary, hyperelasticity refers to the fact that stress does not increase with strain within a certain deformation range, and can be divided into two types: linear hyperelasticity and nonlinear hyperelasticity. The stress-strain curve of the former shows a close linear relationship between stress and strain. Nonlinear hyperelasticity refers to the results of stress induced martensite transformation and its reverse transformation during loading and unloading in a certain temperature range above Af, so nonlinear hyperelasticity is also called transformation pseudoelasticity. The phase transformation pseudo elasticity of nickel titanium alloy can reach about 8%. The superelasticity of nickel titanium alloy can change with changes in heat treatment conditions. When the arch wire is heated above 400 º C, the superelasticity begins to decrease.
At present, over 80% of titanium and titanium alloy wires are used as welding wires, such as welding various titanium equipment, welding pipes, repair welding of aviation jet engine turbine discs and blades, and welding of gearbox.
Due to its excellent corrosion resistance, titanium wire has been widely used in industries such as chemical, pharmaceutical, and papermaking. It can be woven into a mesh for seawater filtration, purified water filtration, chemical drug filtration, and so on.
Titanium and titanium alloy wires are also used to manufacture fasteners, load-bearing components, springs, etc. due to their excellent comprehensive performance.
In the healthcare industry, due to their excellent biocompatibility, titanium and titanium alloy wires are used to manufacture medical devices, implant dental crown fixation, skull fixation, etc.
Some titanium alloy wires with shape memory function, such as titanium nickel alloy wires, are used to make satellite antennas, shoulder pads for clothing, bras for women, glasses frames, etc.
In the electroplating and water treatment industries, titanium and titanium alloy wires are used to manufacture various electrodes.