Microstructure Evolution in Peritectic Systems
Abstract
Solidification microstructure is the decisive parameter in determination of the material properties produced by casting, additive manufacturing, and welding. Even for the system components manufactured by other processes, such as plastic deformation and machining, since most of the metals are first either continuously cast or ingot cast, the fingerprints of the solidification microstructure play a role on the final properties. The main types of microstructures forming upon solidification are dendritic, eutectic, and peritectic structures. Although dendritic and eutectic growth are fairly well understood, peritectic growth still has many open questions although peritectic reaction occurs in many important industrial alloys, such as Fe-C (steel), Cu-Zn (brass), Cu-Sn (bronze), Al-Ti, and Al-Ni. Despite their importance, there is limited understanding regarding the microstructure evolution in peritectic systems. Depending on the composition, convection, and experimental parameters, various multi-phase structures, such as planar front, coupled growth, bands, islands, and helicoidal, are observed even at the same solidification front. Hence, the selection of the microstructure remains to be a big unknown for peritectic growth. In this work, the team will employ real-time directional solidification experiments using both organic and metallic systems to characterize the microstructure and growth dynamics in peritectic systems. While metals enable determination of the composition and texture precisely, using transparent organic alloys, the solidification front dynamics will be observed with high resolution. Besides thermodynamic and process conditions, the possibility of peritectic coupled growth (PCG) is dependent on the initiation mechanism, which may be overgrowth (invasion) or branching mechanism. Through a better understanding of the initiation mechanism, the team will develop a capability to predict peritectic systems in which PCG is possible. The main goal of this project is to understand the dynamic processes of peritectic growth by performing systematic model experiments based on a modern nonlinear physics methodology and to improve our understanding of the associated phenomena in order to open the way to predict, control and hence to the optimization of the microstructure evolution in peritectic systems.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Feb 05, 2025
- Source ID
- FA86552417002
Entities
People
- Melis Serefoglu Kaya
Organizations
- Air Force Office of Scientific Research
- Marmara University
- United States Air Force