The states of order and the phase diagram of Fe1-xSix, 0.06 ⪕ x ⪕ 0.20, investigated by neutron scattering

K. Hilfrich, W. Kölker, W. Petry, O. Schärpf, E. Nembach

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Abstract

The statesof order of iron-silicon solid solutions with atomic fractions c of silicon between 0.06 and 0.2 have been studied in neutron scattering experiments. Up to 873 K, Fe-0.06Si is short-range ordered. The structures of the other alloys can be described as follows. They are DO3 long-range ordered at far lower c and higher temperatures than indicated in the current phase diagram: e.g. Fe-0.099Si up to at least 900 K and Fe-0.197Si up to at least 1473 K. The DO3-order parameter as well as the size of the antiphase domains decrease as the temperature is raised. Some phase boundaries shown in the current phase diagram turned out to be no phase boundaries at all: the respective lines have bearing only on the size of antiphase domains. Revisions of the current FeSi phase diagram are proposed.

Original languageEnglish
Pages (from-to)743-748
Number of pages6
JournalActa Metallurgica Et Materialia
Volume42
Issue number3
DOIs
StatePublished - Mar 1994
Externally publishedYes

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