title: Strength and ductility with {10͞11} - {10͞12} double twinning in a magnesium alloy.
abstract: Based on their high specific strength and stiffness, magnesium alloys are attractive for lightweight applications in aerospace and transportation, where weight saving is crucial for the reduction of carbon dioxide emissions. Unfortunately, the ductility of magnesium alloys is usually limited. It is thought that one reason for the lack of ductility is that the development of - double twins (DTW) cause premature failure of magnesium alloys. Here we show with a magnesium alloy containing 4 wt% lithium, that the same impressively large compression failure strains can be achieved with DTWs as without. The DTWs form stably across the microstructure and continuously throughout straining, forming three-dimensional intra-granular networks, a potential strengthening mechanism. We rationalize that relatively easier <c+a> slip characteristic of this alloy plastically relaxed the localized stress concentrations that DTWs can generate. This result may provide key insight and an alternative perspective towards designing formable and strong magnesium alloys.
authors.affiliation: Technische Universität Berlin, Institut für Werkstoffwissenschaften und -technologien, Metallische Werkstoffe, Ernst-Reuter-Platz 1, Berlin 10587, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Lentz
authors.affiliation: Technische Universität Berlin, Institut für Werkstoffwissenschaften und -technologien, Metallische Werkstoffe, Ernst-Reuter-Platz 1, Berlin 10587, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Risse
authors.affiliation: Helmholtz-Zentrum Berlin für Materialien und Energien GmbH, Institute Nano-architectures for Energy Conversion (EE-IN), Hahn-Meitner-Platz 1, Berlin 14109, Germany.
authors.forename: N
authors.initials: N
authors.lastname: Schaefer
authors.affiliation: Technische Universität Berlin, Institut für Werkstoffwissenschaften und -technologien, Metallische Werkstoffe, Ernst-Reuter-Platz 1, Berlin 10587, Germany.
authors.forename: W
authors.initials: W
authors.lastname: Reimers
authors.affiliation: Los Alamos National Laboratory, Theoretical Division, Los Alamos, New Mexico 87545, USA.
authors.forename: I J
authors.initials: IJ
authors.lastname: Beyerlein