title: Flash Joule heating for ductilization of metallic glasses.
abstract: Metallic glasses (MGs) inherit their amorphous structure from the liquid state, which predetermines their ability to withstand high loads approaching the theoretical limit. However, the absence of slip systems makes them very sensitive to the type of loading and extremely brittle in tension. The latter can be improved by precipitation of ductile crystals, which suppress a catastrophic propagation of shear bands in a glassy matrix. Here we report a novel approach to obtain MG-matrix composites with tensile ductility by flash Joule heating applied to Cu47.5Zr47.5Al5 (at.%) metallic glass. This homogeneous, volumetric and controllable rapid heat treatment allows achieving uniformly distributed metastable B2 CuZr crystals in the glassy matrix. It results in a significant tensile strain of 6.8±0.5%. Moreover, optimized adjustment of the heat-treatment conditions enables tuning of microstructure to achieve desired mechanical properties.
authors.affiliation: IFW Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany.|TU Dresden, Institut für Werkstoffwissenschaft, 01062 Dresden, Germany.
authors.forename: I V
authors.initials: IV
authors.lastname: Okulov
authors.affiliation: IFW Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany.|Institute of Natural Sciences, Ural Federal University, 620000 Ekaterinburg, Russia.
authors.forename: I V
authors.initials: IV
authors.lastname: Soldatov
authors.affiliation: Leibniz-Institut für Oberflächenmodifizierung, e. V. Permoserstrasse 15, 04318 Leipzig, Germany.
authors.forename: M F
authors.initials: MF
authors.lastname: Sarmanova
authors.affiliation: IFW Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany.|TU Dresden, Institut für Werkstoffwissenschaft, 01062 Dresden, Germany.
authors.forename: I
authors.initials: I
authors.lastname: Kaban
authors.affiliation: IFW Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Gemming
authors.affiliation: Department of Chemistry-Ångström Laboratory, Uppsala University, Box 538, 75121 Uppsala, Sweden.
authors.forename: K
authors.initials: K
authors.lastname: Edström
authors.affiliation: IFW Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany.|TU Dresden, Institut für Werkstoffwissenschaft, 01062 Dresden, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Eckert