Date of Graduation
Fall 2019
Degree
Master of Science in Materials Science
Department
Physics, Astronomy, and Materials Science
Committee Chair
Ridwan Sakidja
Abstract
The present study employs molecular dynamics simulations of Ni-based superalloy to investigate the creep behavior under uniaxial compression test. Dislocation dynamics is analyzed for the nickel-based single crystal superalloy with the presence of void and with varying the distribution of gamma-prime phase The results show that multiple-void systems are more prone to yield than single-void systems and single-void systems are more prone to yield than the system without void. From the simulations, it has been determined that the creep mechanism in Ni/Ni3Al is subject to change on the applied stress depending on the distribution of gamma-prime phases change. Dislocation behavior is also observed in addition to the time evolution of dislocation nucleation and growth to quantify the propensity and mechanism of creep in nickel-based single crystal superalloy. The studies confirmed that dislocation length prior to plastic deformation decreased as the number of voids increased. In addition, the deformation behavior for fine-grained nickel-based polycrystalline superalloy upon grain size variation is also investigated. Our findings show that both the movement mechanisms of the grains and grain boundaries and the relationship between grain size and yield strength are highly affected by the grain size of the materials. All the databases have then been classified to accurately predict the target class vi machine learning using the data mining tool WEKA.
Keywords
creep, nickel-based superalloy, molecular dynamics, void, WEKA, gammaprime, polycrystal
Subject Categories
Other Materials Science and Engineering
Copyright
© Sabila Kader Pinky
Recommended Citation
Pinky, Sabila Kader, "Molecular Dynamics Study of Creep Deformation in Nickel-based Superalloy" (2019). MSU Graduate Theses/Dissertations. 3461.
https://bearworks.missouristate.edu/theses/3461
