Münster 1999 – wissenschaftliches Programm
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M: Metallphysik
M 20: Amorphe Metalle II
M 20.7: Vortrag
Donnerstag, 25. März 1999, 13:10–13:25, S 8
Modelling of the solid state amorphization and crystallization processes — •Tatiana Ishenko1, Sergei Demishev2, Nikolai Sluchanko2, Boris Straumal3, and Wolfgang Gust1 — 1Institut f=FCr Metallkunde, Seestr. 92, 70174 Stuttgart — 2General Physics Institute RAS, Vavilov Str. 38, Moscow, 117942 Ru=DFland — 3Institute of Solid State Physics RAS, Chernogolovka, Moscow District, 142432 Ru=DFland
Analysis of the experimental data on solid state amorphization is= =20 performed to propose a simple model for this phenomenon, based on= =20 the deformation field due to the structural defects of a disordered system. It is shown that in various experimental systems the process= =20 of solid state amorphization can be described in a unified manner as= =20 the relaxation of an initially stressed metastable phase. The autowav= e=20 solutions correspond to a travelling front for the phase transformati= on=20 wave and a travelling pulse for the temperature profile associated wi= th=20 the front. The explosion-like crystallization of an amorphous phase c= an=20 be initiated by an external energy input exceeding a critical value.= =20 The application of the developed model for the processes of the formation=20 of the grain structure of thin films at low substrate temperatures is discussed. The work was financially supported by the Alexander von Humboldt-Stiftung, the BMBF-TRANSFORM-Programme, the INCO-Copernicus-Network=20 and an INTAS project.