Tailoring the Bain strain of martensitic transformations in Ti-Nb alloys by controlling the Nb content

Author(s): Matthias Bönisch, Thomas Waitz, Mariana Calin, Werner Skrotzki, Juergen Eckert
Abstract: The lattice (Bain) strain and corresponding volume change of a martensitic phase transformation are key parameters that determine the formation of a self-accommodated martensitic microstructure and related functional properties. Based on experimentally determined lattice parameters of the cubic austenite beta and of the hexagonal and orthorhombic martensites alpha' and alpha '', the lattice strain and the volume change related to the beta -> alpha'/alpha '' martensitic transformations in Ti-Nb alloys are analyzed in dependence of composition. The lattice strains of the transformation beta -> alpha '' increase with decreasing Nb content but those of beta -> alpha' are not affected by the amount of Nb. Depending on the composition, both a volume dilatation and contraction is encountered. It is proposed that the volume change plays a decisive role in determining the lattice structure of the martensitic phase that evolves when the transformation is thermally induced.
Organisation(s): Physics of Nanostructured Materials
External organisation(s): Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden, Technische Universität Dresden, Österreichische Akademie der Wissenschaften (ÖAW), Montanuniversität Leoben
Journal: International Journal of Plasticity
Volume: 85
Pages: 190-202
No. of pages: 13
ISSN: 0749-6419
DOI: https://doi.org/10.1016/j.ijplas.2016.07.010
Publication date: 10-2016
Peer reviewed: Yes
Austrian Fields of Science 2012: 103018 Materials physics
Keywords
ASJC Scopus subject areas: Mechanics of Materials, Mechanical Engineering, Materials Science(all)
Portal url: https://ucrisportal.univie.ac.at/en/publications/tailoring-the-bain-strain-of-martensitic-transformations-in-tinb-alloys-by-controlling-the-nb-content(67958e89-1050-4e96-a78e-a4e49681604b).html