title: Deformation at ambient and high temperature ofin situLaves phases-ferrite composites.
abstract: The mechanical behavior of a Fe80Zr10Cr10alloy has been studied at ambient and high temperature. This Fe80Zr10Cr10alloy, whoose microstructure is formed by alternate lamellae of Laves phase and ferrite, constitutes a very simple example of anin situCMA phase composite. The role of the Laves phase type was investigated in a previous study while the present work focuses on the influence of the microstructure length scale owing to a series of alloys cast at different cooling rates that display microstructures with Laves phase lamellae width ranging from ∼50 nm to ∼150 nm. Room temperature compression tests have revealed a very high strength (up to 2 GPa) combined with a very high ductility (up to 35%). Both strength and ductility increase with reduction of the lamella width. High temperature compression tests have shown that a high strength (900 MPa) is maintained up to 873 K. Microstructural study of the deformed samples suggests that the confinement of dislocations in the ferrite lamellae is responsible for strengthening at both ambient and high temperature. The microstructure scale in addition to CMA phase structural features stands then as a key parameter for optimization of mechanical properties of CMAin situcomposites.
authors.affiliation: Laboratoire SIMaP, CNRS-Université de Grenoble, F-38402 Saint Martin d'Hères, France.
authors.forename: Patricia
authors.initials: P
authors.lastname: Donnadieu
authors.affiliation: IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171, Dresden, Germany; Present address: Fraunhofer-Institut f. Fertigungstechnik und Angewandte Materialforschung, IFAM Institutsteil Dresden, D-01277 Dresden, Germany.
authors.forename: Carsten
authors.initials: C
authors.lastname: Pohlmann
authors.affiliation: IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171, Dresden, Germany.
authors.forename: Sergio
authors.initials: S
authors.lastname: Scudino
authors.affiliation: Laboratoire SIMaP, CNRS-Université de Grenoble, F-38402 Saint Martin d'Hères, France.
authors.forename: Jean-Jacques
authors.initials: JJ
authors.lastname: Blandin
authors.affiliation: IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171, Dresden, Germany; Present address: Department of Materials and Manufacturing Technology, Chalmers University of Technology, SE-41296 Göteborg, Sweden.
authors.forename: Kumar
authors.initials: K
authors.lastname: Babu Surreddi
authors.affiliation: IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171, Dresden, Germany; TU Dresden, Institut für Werkstoffwissenschaft, D-01062 Dresden, Germany.
authors.forename: Jürgen
authors.initials: J
authors.lastname: Eckert
keywords: complex metallic alloys; in situ composites; mechanical behavior; metal matrix composites