|About this Abstract
||Materials Science & Technology 2019
||Late News Poster Session
||P1-100: Void Growth in Bicrystalline and Polycrystalline Ni-based Superalloy: Atomistic Calculation
||Sabila Kader Pinky, Ridwan Sakidja
|On-Site Speaker (Planned)
||Sabila Kader Pinky
This study evaluates the microstructure-sensitive evolution of the deformation mechanisms in Ni-based superalloy with the emphasis on evaluating the role of voids within the microstructures. We assessed the effect of the intergranular void formation toward the overall deformation behaviours by using the Molecular Dynamics (MD) simulations. We varied the positions of voids as well as the grain size and simulated the compression tests from ambient conditions to 1000 °C to determine these factors as a function of temperature on the dislocation dynamics. As deformation accumulation increases, the intergranular voids would grow and coalesce, forming grain boundary cavities, leading to intergranular failures and a catastrophic tertiary creep at high temperatures. In addition, the machine learning method applied to the simulation results provides us with an in-depth correlation between the dislocation dynamics and deformation behaviour. The support from NETL (Crosscutting Research Program) FE0031554 is gratefully acknowledged.