|About this Abstract
||Materials Science & Technology 2019
||Advanced Manufacturing, Processing, Characterization and Modeling of Functional Materials
||Effects of Heat Treatments on H-phase Growth in Thermo-mechanically Processed NiTiZr
||Jordyn Ward, Nathan A. Ley, Robert W. Wheeler, Brian Van Doren, Marcus L. Young
|On-Site Speaker (Planned)
NiTiZr high temperature shape memory alloys (HTSMAs) have many attractive properties, including processability, cost efficiency, and lower density relative to other HTSMAs. Aerospace applications require lighter materials with increasingly high transformation temperatures and precise actuation control, which makes NiTiZr an ideal candidate for actuation systems. However, many previous studies have had difficulty developing and processing NiTiZr alloys without sacrificing shape recovery or actuation performance and actuation fatigue properties, which are largely influenced by the beneficial h-phase nano-precipitates. Hot rolled NiTiZr samples were heat treated at both 550 °C and 650 °C for various time ranges and examined to determine peak transformation temperatures, hardness, and precipitation paths. Basic material characterization was performed using differential scanning calorimetry (DSC) and scanning electron microscopy (SEM), while synchrotron radiation x-ray diffraction (SR-XRD) was utilized to further characterize the hot rolled NiTiZr alloys, specifically focusing on the nucleation and growth of nanoscale h-phase precipitates.
||Planned: At-meeting proceedings