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Bimodal grain size distribution of nanostructured ferritic ODS Fe-Cr alloys

: Hilger, I.; Bergner, F.; Weißgärber, T.


Journal of the American Ceramic Society 98 (2015), Nr.11, S.3576-3581
ISSN: 0002-7820
International Conference on Sintering <7, 2014, Dresden>
Zeitschriftenaufsatz, Konferenzbeitrag
Fraunhofer IFAM, Institutsteil Pulvermetallurgie und Verbundwerkstoffe Dresden ()

Oxide dispersion strengthened Fe-Cr alloys produced by mechanical alloying and spark plasma sintering were found to form different heterogeneous hardness distribution and microstructures depending on the milling parameters. Microstructure investigations by means of electron-diffraction techniques and atom probe tomography revealed the presence of large particle-free zones in one material, which is, together with the inhomogeneous deformation at short milling times, considered the main reason for the formation of a heterogeneous microstructure. The inhomogeneous temperature distribution in the sample volume during the sintering process is also expected to contribute to the formation of a heterogeneous grain size distribution in the final material.