Materials & Design | |
Grain boundary and particle interaction: Enveloping and pass-through mechanisms studied by 3D phase field crystal simulations | |
Håkan Hallberg1  Kevin H. Blixt2  | |
[1] Division of Solid Mechanics, Lund University, P.O. Box 118, SE-221 00 Lund, Sweden;Corresponding author.; | |
关键词: Grain growth; Grain boundary migration; Nanoparticles; Nanocrystalline microstructure; Phase field crystal; | |
DOI : | |
来源: DOAJ |
【 摘 要 】
Grain boundary interaction with second-phase particles having different degrees of coherency is investigated using the phase field crystal (PFC) method. Both the enveloping and pass-through mechanisms are studied with regards to grain boundary pressure, passage time and interface evolution. It is found that coherent particles exert a stronger retardation effect on grain boundaries compared to incoherent particles, with regards to both pressure and time, but also that this benefit is limited to a small range of misfit values. The simulations also show that the mobility is not a constant during particle passage, as commonly assumed, which means that grain boundary pressure cannot easily be extracted from the grain boundary velocity. Furthermore, the complex evolution of the pass-through mechanism and the transient behavior for intermediate coherencies is also investigated. The highest drag force is found to occur at the switching point between enveloping and pass-through. As part of the study, the advantages of using PFC for this type of analyses are also highlighted.
【 授权许可】
Unknown