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MM: Fachverband Metall- und Materialphysik

MM 18: Poster Session I

MM 18.5: Poster

Montag, 16. März 2020, 18:15–20:00, P4

Antiphase domain growth on cubic lattices: a Monte Carlo study — •Ulrike Zweck and Michael Leitner — Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, Garching

The ordering process in binary alloys, following the quench from a disordered state, has a great influence on system properties, such as magnetism or hardness. Describing the atomic ordering process as well as its kinetics accurately is crucial for understanding the correlation of system properties and structural order. The most accessible quantity in measurements, for example in scattering and diffraction experiments, is the structure function S(k).

To give a general model for describing the ordering process and the behavior of antiphase domains (APDs) growing isotropically on crystal structures we investigate systems on cubic lattices via Monte Carlo simulations. We study systems exhibiting two, three or four APDs during the ordering process in the Ising model, the simplest atomistic model, as well as the standard q-state Potts model, which allows us a more abstract view on the ordering process. To describe and compare the growth and coarsening of APDs we exploit the scaling behavior of the pair correlation function as well as its Fourier transform S(k,t) and obtain a scaling factor L for each time step in the ordering process. We define a master curve describing simultaneously the scaled correlation functions as well as their scaled Fourier transforms S(k)L(t) and determine the kinetics of APDs in terms of L(t). Thereby we obtain an explicit and quantitative coupling of length scales in real and reciprocal space.