Abstract
An atomic transition model of a face-centered cubic (fcc) crystal to a primitive hexagonal ω and body-centered cubic (bcc) structures has been crystallographically built. The fcc structure can transform into the ω structure through a local shuffling or displacement of atoms about 0.4014 Å in iron for a fcc iron = 3.59 Å. The bcc structure can form either after the ω formation or concurrently by the similar mechanism, or the ω structure can be treated as an intermediate stage during the transition of fcc → bcc. Such a transition (fcc → ω + bcc transition) can be confirmed by Widmanstätten pattern formed in an iron meteorite, pearlitic structure and martensite composed of bcc-ferrite and ultra-fine ω particles in iron–carbon steels. The present fcc–bcc orientation relationship matches with Pitsch’s one.
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Part of the work is supported by the Grant of JSPS KAKENHI 15H02304.
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Ping, DH. Understanding Solid–Solid (fcc → ω + bcc) Transition at Atomic Scale. Acta Metall. Sin. (Engl. Lett.) 28, 663–670 (2015). https://doi.org/10.1007/s40195-015-0283-z
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DOI: https://doi.org/10.1007/s40195-015-0283-z