|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Computational Materials Discovery and Optimization – From Bulk to Materials Interfaces and 2D Materials
||Microstructure Evolution in Ni materials: Annealing-Detwinning due to Thermal Fluctuation of Incoherent Twin Boundary
||Hao Sun, Chandra Veer Singh
|On-Site Speaker (Planned)
High strength and high ductility are two major desirable goals for metal and alloy. Most traditional strengthening techniques, such as grain size refinement in nanocrystalline metal, can introduce high strength but with the cost of losing ductility. This strength-ductility trade-off can be overcome by the introduction of ultra-fine twin boundaries in polycrystalline metal. Ultrafine growth twins are common microstructure in chemical vapor deposited Nickel metal, but with low thermal stability. Due to the limitation of the experiments, computational simulation is the only possible method to study the atomistic migration of thermal detwinning. We used atomic-scale simulations to validate detwinning through the migration incoherent twin boundary. The driving force for detwinning is found to be dependent on the length and density of the incoherent twin boundary. The remaining dislocation structures after detwinning are attributed to the existence of vacancy near the incoherent twin boundary.
||Definite: None Selected