Faceting of a moving grain boundary and its effect on the kinetic properties of grain boundaries

Sursaeva, Vera G.; Prokofiev, S. I.

doi:10.3103/s1062873817110181

Cited by 2 publications

(3 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…41,43) In the grain growth phenomena, facet and rough boundaries can move by different speed and this could change the shape of grain boundary. 45) Sursaeva et al 45) have been shown that the mobility of facets is greater than the mobility of rough boundary, but by increasing the temperature, this difference would be decreased. In another word the heat sensibility of rough boundary mobility is more than facets.…”

Section: Introductionmentioning

confidence: 99%

“…In another word the heat sensibility of rough boundary mobility is more than facets. 45) As the cooling condition has a key role on microstructure of FSP, so in this research the effect of chilling during the FS-process on size and orientation of grains, distribution of precipitates and type of intersection of grain/precipitation boundaries in AA2024 have been investigated.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Microstructural Evolution in the Friction Stir Processed AA2024

Lalpour,

Mosallaee,

Ashrafi

et al. 2023

Mater. Trans.

View full text Add to dashboard Cite

Friction stir processing (FSP) has been performed on 2024 aluminum alloy sheets. The process was carried out using two different cooling rate i.e., Air Cooling (FSP-AC) and cooling using the liquid nitrogen (FSP-NC). In the current research, the effect of different cooling rates on microstructures and relating precipitates has been investigated. The results have been shown that the average grain size in the stirred zone (SZ) has been decreased significantly in the FSP-NC (1.75 µm) condition, with respect to the FSP-AC (3.3 µm). The misorientation angle of grain boundaries created the special structure. The grain boundaries were facet in FSP-AC and FSP-NC and the rough boundaries was observed in FSP-AC specimen.TEM and EBSD analysis have been indicated the dissolution of ³-Al 2 Cu precipitates in the SZ in the FSP-NC specimen, while FSP-AC caused formation of supersaturated copper solid solution with ³-Al 2 Cu precipitates in the grain boundaries. Furthermore, in the both FSprocessed specimens (FSP-AC and FSP-NC) fine and dispersed Al 20 Cu 2 Mn 3 precipitates have been observed.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microstructural Evolution in the Friction Stir Processed AA2024

Lalpour,

Mosallaee,

Ashrafi

et al. 2023

Mater. Trans.

View full text Add to dashboard Cite

show abstract

“…The formation and presence of faceted boundaries has been shown to slow the migration of neighboring interfaces [1,2] while their disappearance from a microstructure in the form of a defaceting transition has been connected to abnormal grain growth [3]. Each sub-structure of a faceted boundary can also have its own unique impact on microstructure.…”

Section: A Introductionmentioning

confidence: 99%

Shuffling mode competition leads to directionally anisotropic mobility of faceted Σ11 boundaries in fcc metals

McCarthy

Rupert

2020

Phys. Rev. Materials

View full text Add to dashboard Cite

Faceted grain boundaries can migrate in interesting and unexpected ways. For example, faceted Σ11 <110> tilt grain boundaries were observed to exhibit mobility values that could be strongly dependent on the direction of migration. In order to understand whether this directionallyanisotropic mobility is a general phenomenon and to isolate mechanistic explanations for this behavior, molecular dynamics simulations of bicrystals evolved under an artificial driving force are used to study interface migration for a range of boundary plane inclination angles and temperatures in multiple face centered cubic metals (Al, Ni, and Cu). We find that directionallyanisotropic mobility is active in a large fraction of these boundaries in Ni and Cu and should therefore impact the coarsening of polycrystalline materials. On the other hand, no such anisotropy is observed in any of the Al boundaries, showing that this behavior is material-dependent.Migration of the faceted boundaries is accomplished through transformation events at facet nodes and incommensurate boundary plane facets, which are termed shuffling modes. Three major shuffling modes have been identified, namely Shockley shuffling, slip plane shuffling, and disordered shuffling. A shift from the first two ordered modes to the third disordered mode is found to be responsible for reducing or removing directionally-anisotropic mobility, especially at the highest temperatures studied.

show abstract

Faceting of a moving grain boundary and its effect on the kinetic properties of grain boundaries

Cited by 2 publications

References 7 publications

Microstructural Evolution in the Friction Stir Processed AA2024

Microstructural Evolution in the Friction Stir Processed AA2024

Shuffling mode competition leads to directionally anisotropic mobility of faceted Σ11 boundaries in fcc metals

Contact Info

Product

Resources

About