title: Effect of rhenium on the dislocation core structure in tungsten.
abstract: Despite exhibiting the highest melting point of all metals, the technological use of tungsten is hampered by its room-temperature brittleness. Alloying with Re significantly ductilizes the material which has been assigned to modified properties of the 1/2(111) screw dislocation. Using density functional theory, we show that alloying induces a transition from a symmetric to an asymmetric core and a reduction in Peierls stress. This combination ductilizes the alloy as the number of available slip planes is increased and the critical stress needed to start plastic deformation is lowered.
authors.affiliation: Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstrasse 12, A-8700 Leoben, Austria. lorenz.romaner@mu-leoben.at
authors.forename: Lorenz
authors.initials: L
authors.lastname: Romaner
authors.forename: Claudia
authors.initials: C
authors.lastname: Ambrosch-Draxl
authors.forename: Reinhard
authors.initials: R
authors.lastname: Pippan