Dresden 2017 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 57: Microstructure and Phase Transformations - transformation kinetics

MM 57.2: Vortrag

Donnerstag, 23. März 2017, 10:30–10:45, IFW B

Extracting the kinetics of grain growth in Al-based polycrystals from 4D measurements — •Mingyan Wang1, Jules Dake1, Jette Oddershede2, Henning Sørensen3, Søren Schmidt2, and Carl Krill11Ulm University, Germany — 2Technical University of Denmark, Denmark — 3University of Copenhagen, Denmark

Conventional studies of grain growth rely on 2D micrographs, which reveal that curved grain boundaries (GBs) tend to migrate toward their centers of curvature. From bicrystal experiments we learn that the reduced mobility (the product of GB mobility and energy) depends not only on curvature but also on boundary misorientation and inclination. Using 3D x-ray diffraction (3DXRD) microscopy, we have investigated the latter dependency in Al-based polycrystalline materials following a novel 4D protocol. From a series of 3D snapshots separated by isothermal annealing intervals, we have extracted the morphology, misorientation and migration rate of more than ten thousand GBs in a single sample, forming the basis for a robust statistical analysis of local growth kinetics. In one particular specimen, the observed dependency of reduced mobility on misorientation and inclination is consistent with behavior expected of normal grain growth, but in another case we find evidence for abnormal boundary migration that does not fit standard models.

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