title: Sphere packings as a tool for the description of martensitic phase transformations.
abstract: Martensitic transformations which play an important role in metallurgical processes are analysed using group-subgroup relations and sphere-packing considerations. This approach is applied to the transformations between body-centred cubic (b.c.c.) and face-centred cubic (f.c.c.) phases and yields the orientation relations according to the Nishiyama-Wassermann, the Kurdjumov-Sachs and the Pitsch mechanisms. The models proposed by Pitsch and Schrader and by Burgers for the transition between b.c.c. and hexagonally closest-packed (h.c.p.) type structures can be interpreted analogously. In addition, two mechanisms for the transition between cubic f.c.c. and h.c.p. structures are described.
authors.affiliation: GZG Abteilung Kristallographie, Georg-August-Universität Göttingen, Goldschmidtstrasse 1, Göttingen, 37077, Germany.
authors.forename: Heidrun
authors.initials: H
authors.lastname: Sowa
keywords: group–subgroup relations; martensitic transformations; orientation relationships; sphere packings