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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.

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Additive Manufacturing Design of Metal Matrix Composites of Stainless Steel 316 and Inconel 718
Alternate Phase Transformation Paths in a Nb-50Ti Alloy in the Presence of Oxygen Interstitials
Develop Precipitation-Strengthened Refractory High Entropy Alloys for Turbine Blades Applications above 1300 Degree Celsius
E-1: Multiscale Modeling of Solidification Processes for Metal & Alloys
Effect of Grain Boundary Phases on Creep Properties of a Novel Ni-Co Based Superalloy
Examining the Influence of Nitride Precipitation on the Performance of Additively Manufactured Nickel Superalloys
Hyper Duplex Stainless Steel: A Study on the Sigma Phase Formation
Impact of Manufacturing Processes on Phase Transformations in High-temperature Alloys: Some Thoughts Based on Representative Case Studies
In-situ Neutron Characterization of Thermomagnetic Processes Utilizing Direct Induction Heating
Metallic Alloy Microstructure Prediction and Control with Processing
Microstructure and Mechanical Properties of W-free γ + γ' Co-based Superalloys with Ni, Cr, and Fe Additions
Microstructure Evolution and Mechanical Properties of α′/α″-Strengthened Ferritic Superalloys
On the Shapes of Time-Temperature-Transformation Curves across Alloys and Reactions
Phase Stability in Cast and Additively Manufactured Al-9 wt%Cu-6 wt%Ce Alloy
Precipitation Strengthening in BCC Al2.7CrMnTiV High-Entropy Alloys
Precursor Metastable Phases and Their Influence on α Precipitation in the Metastable β-titanium Alloy, Ti-5Al-5Mo-5V-3Cr
Single-step Aging Treatment on Cast Haynes 282 Ni-based Alloy – Microstructure and Mechanical Behavior
Solidification Modelling With CALPHAD: Process Applications of Equilibrium and Non-equilibrium Models and When to Use Them
Study of Thermal Decomposition of γ’-Fe4N Using Molecular Dynamics Simulation
The Optimization of Local Phase Transformation Strengthening in Next Generation Superalloys
Thermal Stability and Time-temperature-transformation Diagrams of Co-rich Nanocomposite Ribbons
Tracking Changes in Microstructure and Mechanical Properties of Electron Powder Bed Fusion Produced Inconel-738

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