Metadislocations in Complex Metallic Alloys and theis Relation to Dislocations in Icosahedral Quasicrystals

Complex metallic alloys and quasicrystals are closely related. Both possess icosahedral local order, but while in quasicrystals the long-range order and hence the macroscopic structure is also icosahedral, in complex metallic alloys a periodic structure with large lattice parameters is formed. Metadislocations are novel and highly complex structural defects in complex metallic alloys. Focusing on metadislocations in e-type phases, we will review the basic geometric concepts of metadislocations and the relation between the number of phason planes, Burgers vector, and the elastic energy. The properties of dislocations in icosahedral Al-Pd-Mn will briefly be recalled and discussed in relation to metadislocations