ساختار مرزدانه‌های زاویه - باز The structure of high-angle grain boundaries

The structure of high-angle grain boundaries

ساختار مرزدانه‌های زاویه - باز

ABSTRACT

A coincidence model of high-angle grain boundaries can be extended to include deviations from coincidence. The generalised boundary has a terraced structure, corresponding to the densely packed planes in the coincidence lattice, and a superimposed dislocation network, corresponding to a sub-boundary in the coincidence lattice. This model is a natural extension of previous dislocation models and models based on coincidence relationships. The model explains many of the observed properties of grain boundaries and should have wide validity for the cubic system.

 

مرزدانه هایی با زاویه بالا high angle grain boundaries

Disclination model of high angle grain boundaries

مدل disclination در مرزدانه هایی با زاویه بالا

ABSTRACT

Since the grain boundary is a rotational defect and so is a disclination, it is proposed here that a grain boundary may be made of disclinations instead of dislocations which are translational defects. The excess elastic energy for a symmetric tilt boundary whose orientation is between two low energy orientations is calculated by using this model. Such calculation cannot be easily performed using dislocations.