title: In situ studies of mass transport in liquid alloys by means of neutron radiography.
abstract: When in situ techniques became available in recent years this led to a breakthrough in accurately determining diffusion coefficients for liquid alloys. Here we discuss how neutron radiography can be used to measure chemical diffusion in a ternary AlCuAg alloy. Neutron radiography hereby gives complementary information to x-ray radiography used for measuring chemical diffusion and to quasielastic neutron scattering used mainly for determining self-diffusion. A novel Al(2)O(3) based furnace that enables one to study diffusion processes by means of neutron radiography is discussed. A chemical diffusion coefficient of Ag against Al around the eutectic composition Al(68.6)Cu(13.8)Ag(17.6) at.% was obtained. It is demonstrated that the in situ technique of neutron radiography is a powerful means to study mass transport properties in situ in binary and ternary alloys that show poor x-ray contrast.
authors.affiliation: Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR), Köln, Germany. florian.kargl@dlr.de
authors.forename: F
authors.initials: F
authors.lastname: Kargl
authors.forename: M
authors.initials: M
authors.lastname: Engelhardt
authors.forename: F
authors.initials: F
authors.lastname: Yang
authors.forename: H
authors.initials: H
authors.lastname: Weis
authors.forename: P
authors.initials: P
authors.lastname: Schmakat
authors.forename: B
authors.initials: B
authors.lastname: Schillinger
authors.forename: A
authors.initials: A
authors.lastname: Griesche
authors.forename: A
authors.initials: A
authors.lastname: Meyer