About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
|
Symposium
|
Alloy Phase Transformations at Elevated Temperatures
|
Presentation Title |
Thermal Stability and Time-temperature-transformation Diagrams of Co-rich Nanocomposite Ribbons |
Author(s) |
Yuankang Wang, Paul Richard Ohodnicki |
On-Site Speaker (Planned) |
Yuankang Wang |
Abstract Scope |
Co-rich amorphous and nanocrystalline (i.e. nanocomposite) ribbons exhibit excellent magnetic and mechanical properties with tunable characteristics through magnetic field and strain annealing methods, making it promising for applications such as inductors and current transformers. Of particular interest for space and other extreme environments are high temperature performance and stability. In this project, the thermal stability of Co-rich nanocomposite alloys at elevated temperature has been investigated. The phase transition behavior as a function of temperature and time was studied using differential scanning calorimetry (DSC). Transmission electron microscopy (TEM) and X-ray diffraction (XRD) were performed for the microstructure investigation. The results shows that the alloy exhibits two step crystallizations: CoFe-based primary crystallites at 430 oC and CoFe-rich borides at 645 oC. Detailed characterization of the microstructure stability combined with magnetic property evolution is studied indicating the alloy exhibits excellent thermal stability and is promising for magnet applications at elevated temperature. |