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Continuous atomic displacements and lattice distortion during fcc–bcc martensitic transformation.
- Source :
-
Acta Materialia . Sep2015, Vol. 96, p189-202. 14p. - Publication Year :
- 2015
-
Abstract
- The continuous matrices of atomic displacements and lattice distortion from face-centered-cubic (fcc) to body-centered-cubic (bcc) phases compatible with the hard-sphere geometry of iron atoms are calculated for different possible final orientation relationships (ORs), such as Bain, Pitsch and Kurdjumov–Sachs (KS). The angular distortion introduced in the calculations appears as a natural order parameter of the fcc–bcc transitions. The average atomic displacement is lower with Pitsch and KS ORs than for Bain; one of these two distortions probably constitutes the natural mechanism for stress-free isolated small crystals. For matrix-embedded transformations that occur in bulk steels, the distortion associated with KS OR seems very appropriate: it has special mathematical properties and can explain the {2 2 5} habit planes with a simple O-lattice criterion. From these calculations, the fcc–bcc martensitic transformation appears to be “angular distortive”, and not of “shear” type as usually assumed. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13596454
- Volume :
- 96
- Database :
- Academic Search Index
- Journal :
- Acta Materialia
- Publication Type :
- Academic Journal
- Accession number :
- 108433534
- Full Text :
- https://doi.org/10.1016/j.actamat.2015.06.010