Planar defects in ordered systems

The high strength, good oxidation resistance, and high melting point displayed by many non-cubic intermetallics have given an impetus to high-temperature structural applications of this class of materials. However, because moderate ductility at ambient temperatures is also demanded, research has been focused mainly on the non-cubic structures that are closely related to cubic ones, such as the promising D019. Nevertheless, the global mechanical behaviour is determined by local phenomena on an atomic scale, and these are not well understood and still require investigation. Classification and identification of extended defect structures is essential for this purpose, as these defects affect substantially the ductility of non-cubic compounds. Furthermore, a fundamental comprehension of the mechanisms responsible for defect formation is crucial. ... Zie: Summar