Understanding the Interaction Between Grain Boundaries and Precipitates in Ni-Al Using Molecular Dynamics PDF Download

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Understanding the Interaction Between Grain Boundaries and Precipitates in Ni-Al Using Molecular Dynamics

Understanding the Interaction Between Grain Boundaries and Precipitates in Ni-Al Using Molecular Dynamics PDF Author: Rachel Louise Morrison
Publisher:
ISBN:
Category : Grain boundaries
Languages : en
Pages : 92

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Book Description
This thesis investigates the interaction between gamma' precipitates and grain boundaries in a Ni-Al system during deformation. This interaction is investigated using molecular dynamics, and gamma'/boundary configurations were built to investigate how the orientation, size, and interaction of gamma' change the deformation behavior of the grain boundary. The gamma' aided in nucleating defects (i.e., dislocations) that contributed to the boundary sliding mechanism. By increasing the size of precipitates that bisect the boundary, the boundary becomes stronger, whereas increasing the size of precipitates adjacent to the boundary makes the boundary weaker. Additionally, the interaction of multiple gamma' plays a role in grain boundary sliding behavior. Low concentrations of gamma' produce sliding dominated by atomic shuffling, whereas high concentrations of gamma' produce sliding dominated by dislocation emission. More work is needed to investigate the effects of temperature, initial defects, and different grain boundary configurations on sliding behavior.