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Unusual acceleration and size effects in grain boundary migration with shear coupling | | Liang Yang
; Xinyuan Song
; Tingting Yu
; Dahai Liua
; Chuang Deng
; | | Date: |
2 Jan 2023 | | Abstract: | Grain boundary (GB) migration is widely believed to maintain a linear
relation between its displacement and time under a constant driving force. In
this study, we investigated the migration behaviors of a set of GBs in Ni by
applying the synthetic driving force and shear stress via atomistic
simulations. It was found that the displacements of some shear-coupling GBs do
not exhibit a linear or approximately linear relation with the time, as widely
assumed, but evidently exhibit an acceleration tendency. Moreover, the boundary
velocity significantly decreases when increasing the bicrystal size
perpendicular to the GB plane. These behaviors were verified to be independent
of the magnitude and type of driving force but closely related to the
temperature and revealed to be unique to shear-coupling GBs exhibiting a rise
in the kinetic energy component along the shear direction. Moreover, after many
attempts, we found that the acceleration in migration and size effect can be
largely alleviated by adopting one specific kind of boundary condition.
Nevertheless, the continuous rise of kinetic energy still exists and leads to
the true driving force for GB migration lower than the nominally applied value.
For that reason, a technique is proposed to extract the true driving force
based on a quantitative analysis of the work-energy relation in the bicrystal
system. Accordingly, the calculated true mobility shows that the recently
proposed mobility tensor may not be symmetric at relatively large driving
forces. | | Source: | arXiv, 2301.00526 | | Services: | Forum | Review | PDF | Favorites | |
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