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 های با زاویه زیاد در فلزات و اکسیدهای سرامیکی

Structure of High-Angle Grain Boundaries in Metals and

Ceramic Oxides

ساختار مرزدانه های با زاویه زیاد در فلزات و اکسیدهای سرامیکی 

ABSTRACT

The current knowledge of the structure of high-angle grain boundaries in metals and ceramic oxides is critically reviewed. Particular attention is given to effects due to differences in the bonding and crystal structure in these solid types. The results of recent experimental work and efforts to model grain-boundary structure using computer simulation methods are described. Important characteristic features of boundaries in these materials are discussed. Difficulties which are presently being encountered in efforts to determine their structure are pointed out.