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
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
Publication status
Published
Peer reviewed
Yes
Austrian Fields of Science 2012
103018 Materials physics
Keywords
Phase transformation, Elastic material, Characteristics, Volume change, SHAPE-MEMORY ALLOYS, HYDROSTATIC-PRESSURE, PHASE-TRANSFORMATION, PLASTIC-DEFORMATION, ALPHA''-MARTENSITE, THERMAL-EXPANSION, BASE ALLOYS, BETA-PHASE, D-METALS, TITANIUM
Portal url
https://ucris.univie.ac.at/portal/en/publications/tailoring-the-bain-strain-of-martensitic-transformations-in-tinb-alloys-by-controlling-the-nb-content(67958e89-1050-4e96-a78e-a4e49681604b).html