Deformation at ambient and high temperature of in situ Laves phases-ferrite composites
Journal article, 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.

complex metallic alloys

metal matrix composites

in situ composites

mechanical behavior

Author

P. Donnadieu

Université Grenoble Alpes

C. Pohlmann

Fraunhofer-Institut fur Fertigungstechnik und Angewandte Materialforschung - IFAM

Leibniz Institute for Solid State and Materials Research Dresedn

S. Scudino

Leibniz Institute for Solid State and Materials Research Dresedn

J.J. Blandin

Université Grenoble Alpes

Kumar Babu Surreddi

Chalmers, Materials and Manufacturing Technology, Surface and Microstructure Engineering

Juergen Eckert

Technische Universität Dresden

Leibniz Institute for Solid State and Materials Research Dresedn

Science and Technology of Advanced Materials

1468-6996 (ISSN)

Vol. 15 3

Subject Categories

Energy Engineering

DOI

10.1088/1468-6996/15/3/034801

More information

Latest update

9/2/2019 3