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Deformation at ambient and high temperature of in situ Laves phases-ferrite composites
Laboratoire SIMaP, CNRS—Université de Grenoble, F-38402 Saint Martin d’Hères, France.
IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany; .
IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
Laboratoire SIMaP, CNRS—Université de Grenoble, F-38402 Saint Martin d’Hères, France.
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2014 (English)In: Science and Technology of Advanced Materials, ISSN 1468-6996, E-ISSN 1878-5514, Vol. 15, no 3Article in journal (Refereed) Published
Abstract [en]

The mechanical behavior of a Fe80Zr10Cr10 alloy has been studied at ambient and high temperature. This Fe80Zr10Cr10 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.

Place, publisher, year, edition, pages
IOP Publishing , 2014. Vol. 15, no 3
National Category
Materials Engineering
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URN: urn:nbn:se:du-31541DOI: 10.1088/1468-6996/15/3/034801OAI: oai:DiVA.org:du-31541DiVA, id: diva2:1382096
Available from: 2020-01-02 Created: 2020-01-02 Last updated: 2020-01-02Bibliographically approved

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Surreddi, Kumar Babu

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