Grain Boundary Wetting in Zn Bicrystals by a Sn-Based Melt

Imaging grain boundary grooves in hard-sphere colloidal bicrystals.

Colloidal particles were sedimented onto patterned glass slides to grow three-dimensional bicrystals with a controlled structure. Three types of symmetric tilt grain boundaries between close-packed face-centered-cubic crystals were produced: Σ5(100),Σ17(100), and Σ3(110). The structure of the crystals and their defects were visualized by confocal microscopy, and characterized by simple geometri...

Phenomenology and Mechanism of Grain Boundary Sliding in Zinc Bicrystals

On grain boundary wetting during deformation

We use numerical experiments to analyze the kinetics of grain boundary wetting in polycrystalline aggregates under the influence of an external applied shear stress. Grain boundary wetting is driven by the stress concentration at the tip of the fluid front. The extent of wetting of favorably oriented grain boundaries depends on the fluid mobility number b, which is defined as the ratio of the r...

CHARGED GRAIN-BOUNDARIES IN n-Ge BICRYSTALS

Germanium bicrystals with two types of low-energy symmetric tilt boundaries, Z 9 and Z 1 1 (CSL model classification) were grown. Current-voltage characteristics of grainboundaries were measured in the temperature range 77 K-420 K. Potential barriers were found only at Z 1 1 boundaries in n Ge which confirms the theoretical predictions of the atomic structure of these boundaries [I]. From the e...

Effect of Grain Boundary Melting on Sliding in Bicrystals: a Molecular Dynamics Study

Grain boundaries arc known to exert a profound influence on the properties of polycrystalline materials at high temperature. Experimental studies on grain boundary sliding in Al bicrystals (I), or more recently in Zn bicrystals (2), show a change in the temperature dependence of the sliding rate at temperatures between 70% to 90% of the bulk melting point. The critical temperature at which a ch...