A5067900897- High Temperature Alloys and Creep
- Advanced Materials Characterization Techniques
- Shape Memory Alloy Transformations
- Solidification and crystal growth phenomena
- Microstructure and Mechanical Properties of Steels
- Nuclear Materials and Properties
- nanoparticles nucleation surface interactions
- Ferroelectric and Piezoelectric Materials
- Titanium Alloys Microstructure and Properties
- Healthcare Systems and Reforms
- High Entropy Alloys Studies
- Additive Manufacturing Materials and Processes
- Block Copolymer Self-Assembly
- Metal and Thin Film Mechanics
- Microstructure and mechanical properties
- Aluminum Alloy Microstructure Properties
The Ohio State University
2021-2023
Columbia University
2016
The development of high-temperature heavy-duty turbine disk materials is critical for improving the overall efficiency combined cycle power plants. An alloy strategy to this end involves superalloys strengthened by ‘compact’ γ′-γ″ coprecipitates. Compact morphology coprecipitates consists a cuboidal γ′ precipitate such that γ″ discs coat its six {001} faces. present work an attempt investigate microstructure and creep behavior fully aged exhibiting compact We conducted heat treatments,...
Implantation of Ni50.5Ti49.5 wire with 30 MeV Ni6+ ions at doses (< 0.1 DPA) typically smaller than employed in the literature is shown to systematically alter pseudoelastic response, extrema Berkovich nanoindentation load (+50%), hysteresis (−60%), and recoverable displacement (−19%) occurring ~ 3.6 μm below implantation surface. These extraordinary values are attributed 10 20 nm amorphous clusters that constrain stress-induced B2-B19′ phase transformation. This substantiated by field...
Recent experimental observations have shown various γ'/γ'' coprecipitate microstructures in Inconel 718-based alloys. Although their growth and coarsening behaviors been investigated recently, the heterogeneous nucleation mechanisms of γ'' precipitates on pre-existing γ' that lead to formation these coprecipitates are yet be understood. In this study, we use primarily phase field simulations analyze individual combined effects concentration coherency stress fields associated with a growing...