Short-range order in undercooled and stable melts forming quasicrystals and approximants and its influence on nucleation

Dirk Holland-Moritz (1) , Thomas Schenk (1) , Virginie Simonet (2) , Robert Bellissent (3)

1 DLR Institut für Raumsimulation
2 LLN - Laboratoire Louis Néel
3 SPSMS - UMR 9001 - Service de Physique Statistique, Magnétisme et Supraconductivité

An icosahedral short-range order has been predicted to prevail in undercooled metallic melts. For melts of pure metals this hypothesis was recently experimentally confirmed by diffraction experiments. This work presents results of neutron scattering experiments on the short-range order of stable and undercooled liquids of alloys forming quasicrystals and polytetrahedral crystals. The studies indicate that an icosahedral topological short-range order prevails in all of the investigated melts. The influence of this icosahedral short-range order on the nucleation behaviour of solid phases from the undercooled liquid is discussed.

Mots clés: Physical Sciences

Domaines: Physique Générale [physics.gen-ph]

Dirk Holland-Moritz, Thomas Schenk, Virginie Simonet, Robert Bellissent. Short-range order in undercooled and stable melts forming quasicrystals and approximants and its influence on nucleation. Philosophical Magazine, 2005, 86 (03-05), pp.255-262. ⟨10.1080/14786430500253992⟩. ⟨hal-00513570⟩