|About this Abstract
|2020 TMS Annual Meeting & Exhibition
|Coatings and Surface Engineering for Environmental Protection II
|Fatigue Corrosion Behavior of NiTi Shape Memory Alloy
|Mahdi Mohajeri, Dimitris C Lagoudas, Homero Castaneda
|On-Site Speaker (Planned)
The fatigue process causes the protective passive film rapture, which accelerates the corrosion of metallic materials. The synergic interaction of fatigue and corrosion processes with variable thermal and mechanical loads cause the shorter fatigue lifetime. In this study, the thermomechanical fatigue of Nickel-Titanium shape memory alloy (SMA) undergoing thermally induced martensitic phase transformation in a physiological corrosive environment is investigated. The effect of the change in phases of Nickel-Titanium SMA on the electrochemical behavior at different load levels was characterized. Electrochemical techniques showed the global influence on the SMA surface during the change in crystallographic orientation and phase transformation due to the loading conditions. This change in crystallographic orientation affected the surface of Nickel-Titanium SMA locally. These local effects could be sensed by the global interfacial changes with electrochemical measurements, such as Electrochemical Impedance Spectroscopy (EIS), Open Circuit potential (OCP) and Linear polarization (LPR) methods.
|Planned: Supplemental Proceedings volume