Properties of Low-Oxygen, Low-Carbon NiTi

As NiTi applications have become more demanding of the material attributes like fatigue performance, suppliers have responded with advancements in NiTi alloy formulation and production improvements. At ATI Wah Chang, a low oxygen and low carbon NiTi alloy, which was first presented at SMST-2003, has been further developed into a standard product now offered in the NiTi marketplace.  This alloy contains smaller and fewer nonmetallic inclusions than traditional NiTi alloys. The advancement of the production process has enabled the supply of this unique product in all standard mill product forms to users of NiTi alloy. The characteristics of this material such as nonmetallic inclusion size and frequency, chemistry, transformation temperatures, grain size, and mechanical properties will be presented.