|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Computational Design and Simulation of Materials (CDSM 2018): Atomistic Simulations
||The Kinetic Mechanism Underlying the Solid-state Precipitation of Core-shell Particle in Al-Zr-Er Alloy
||Shang-Yi Ma, Shao-Qing Wang
|On-Site Speaker (Planned)
The strengthening mechanism of dispersion-hardened Al alloy mostly results from the formation of the second-phase particles. Understanding the kinetic mechanism underlying the solid-state precipitation of second-phase particles is essential to optimize the mechanical properties of precipitation-strengthened Al alloys. In this work, we examined Al<sub>3</sub>Zr<sub>x</sub>Er<sub>1-x</sub> precipitation in Al-Zr-Er alloy and proposed a kinetic model that explains the kinetic mechanism underlying of Er-accelerating solid-state precipitation of core-shell particles in combination with first-principles calculations and atomic kinetic Monte Carlo simulations. The factors relevant to the precipitation of Al<sub>3</sub>Zr<sub>x</sub>Er<sub>1-x</sub> particles, including driving-force, critical size, structure, composition, thermal stability, nucleation and growth rate, were explored. The acceleration of additive Er on the precipitation of core-shell particles was demonstrated. This study provides further understanding on the kinetic mechanism of Er-acceleration core-shell precipitate particles, and hence offers an opportunity for better controlling the precipitation kinetics of Al-Zr-Er alloy.
||Planned: Supplemental Proceedings volume