title: Diffusion in Al-Cu melts studied by time-resolved X-ray radiography.
abstract: We use time-resolved x-ray radiography in order to monitor interdiffusion processes in situ in liquid alloys. We measure temperature and composition dependent interdiffusion coefficients (D{AlCu}) in Al-rich Al-Cu melts. At constant temperature, D{AlCu} only exhibits a weak dependence of the alloy composition. As compared to self-diffusion, interdiffusion is enhanced by a factor of about 3. Our results demonstrate that it is not possible to express interdiffusion in terms of self-diffusion and thermodynamic driving forces.
authors.affiliation: Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR), 51170 Köln, Germany.
authors.forename: B
authors.initials: B
authors.lastname: Zhang
authors.forename: A
authors.initials: A
authors.lastname: Griesche
authors.forename: A
authors.initials: A
authors.lastname: Meyer