Corrosion Resistance of High-Temperature SMAs Under Extreme Environments
Abstract
Newly discovered affordable nano-precipitation hardened Ni-rich NiTi(Hf,Zr) High Temperature Shape Memory Alloys (HTSMAs) have considerable potential for use in a wide range of applications at temperatures up to 500 degrees C, including solid state actuators and multifunctional components [1-3]. HTSMA-based solid state actuators are an attractive alternative to electromagnetic actuators when a small volume and/or large force are required. HTSMAs can thus perform the functions of several materials and parts simultaneously, thus simplifying the device design, having fewer parts to break or wear down, and resulting in lower weight, cost and maintenance. The proposed research effort aims for the assessment of the effect of electrochemical degradation on the structural and functional properties of nano-precipitation hardened Ni-rich NiTi(Hf,Zr), due to combined thermomechanical cyclic loading and corrosion. Own preliminary corrosion tests of porous NiTi in Hank s solution reveal the microstructure shown in Fig. 1. The effect of porosity on the pseudoelasticity of NiTi is investigated by FEM in [4].
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Feb 06, 2017
- Source ID
- FA95501710059
Entities
People
- Nikolaos Michailidis
Organizations
- Air Force Office of Scientific Research
- Aristotle University of Thessaloniki
- United States Air Force