Structure around Grain Boundaries of Polycrystalline Magnesium deformed at 473 K

Grain Boundaries in Polycrystalline Alumina

Low-energy, Mobile Grain Boundaries in Magnesium

The strong basal texture that is commonly developed during the rolling of magnesium alloy and can even increase during annealing motivates atomic-level study of dislocation structures of both <0001> tilt and twist grain boundaries (GBs) in Magnesium. Both symmetrical tilt and twist GBs over the entire range of rotation angles θ between 0° and 60° are found to have an ordered atomic structure an...

Tem Investigation of Grain Boundaries in Polycrystalline Silicon

The structure of two near-coincidence boundaries (close to a I = 7 and a Z = 9 misorientation) occurring in commercial poly-silicon has been examined in TEM. Both the structure of secondary dislocation networks as well as the occurrence of a-fringes (indicating a relative translation of the crystals along the boundary) were investigated. The near Z = 7 boundary is found to contain a simple netw...

Tailoring electrical transport across grain boundaries in polycrystalline graphene.

Graphene produced by chemical vapor deposition (CVD) is polycrystalline, and scattering of charge carriers at grain boundaries (GBs) could degrade its performance relative to exfoliated, single-crystal graphene. However, the electrical properties of GBs have so far been addressed indirectly without simultaneous knowledge of their locations and structures. We present electrical measurements on i...

Segregation of calcium to magnesium oxide grain boundaries

Grain boundary (GB) segregation has been measured in Ca-doped MgO by examining intergranular fracture surfaces with Auger electron spectroscopy. The measurements reveal several interesting features. The composition of any given GB on the fracture surface is almost uniform, except for small variations due to deviations from planarity. There is a strong anisotropy of GB composition, which can amo...