Deformation at ambient and high temperature of in situ Laves phases-ferrite composites
Artikel i vetenskaplig tidskrift, 2014

The mechanical behavior of a Fe80Zr10Cr10 alloy has been studied at ambient and high temperature. This Fe 80Zr10Cr10 alloy, whoose microstructure is formed by alternate lamellae of Laves phase and ferrite, constitutes a very simple example of an in situ CMA 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 CMA in situ composites. © 2014 National Institute for Materials Science.

metal matrix composites

mechanical behavior

complex metallic alloys

in situ composites

Författare

P. Donnadieu

Université Grenoble Alpes

C. Pohlmann

Leibniz-Institut fur Festkorper- und Werkstoffforschung Dresden

Fraunhofer-Institut fur Fertigungstechnik und Angewandte Materialforschung - IFAM

S. Scudino

Leibniz-Institut fur Festkorper- und Werkstoffforschung Dresden

J.J. Blandin

Université Grenoble Alpes

Kumar Babu Surreddi

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Juergen Eckert

Leibniz-Institut fur Festkorper- und Werkstoffforschung Dresden

Technische Universität Dresden

Science and Technology of Advanced Materials

1468-6996 (ISSN)

Vol. 15 3

Ämneskategorier

Energiteknik

DOI

10.1088/1468-6996/15/3/034801