Superelasticity of nitinol refers to the phenomenon that the niti alloy produces a strain far greater than the elastic limit strain under the action of external force, and the strain can be automatically recovered during unloading. That is, in the mother phase state, the stress-induced martensitic transformation occurs due to the applied stress, so that the alloy exhibits a mechanical behavior different from that of ordinary materials, and its elastic limit is far greater than that of ordinary materials. Compared to shape memory characteristics, superelasticity does not involve heat. In summary, superelasticity means that the stress does not increase with the increase of strain within a certain deformation range, and the superelasticity can be divided into two types: linear superelasticity and nonlinear superelasticity. The stress-strain curve in the former has a linear relationship between stress and strain. Nonlinear superelasticity is the result of stress-induced martensitic transformation and reverse phase transformation during loading and unloading in a certain temperature range above Af. Therefore, nonlinear superelasticity is also called phase transformation pseudoelasticity. The phase-change pseudo-elasticity of Ni-Ti alloy can reach about 8%. The superelasticity of Nitinol can be changed as the conditions of the heat treatment change. When the archwire is heated above 400℃, the superelasticity begins to decrease.
Information about nitinol fine wire, thin niti wire, micro nitinol wire:
Size:0.01~1mm
Composition: Ni 53%~57%,Ti balanced
Surface:electropolished and bright
Application: Medical,daily life, industry etc.
