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

Authors/others:Bönisch, Matthias (IFW Dresden, Institute for Integrative Nanosciences (IIN), Inst Complex Mat) Waitz, ThomasCalin, Mariana (IFW Dresden, Institute for Integrative Nanosciences (IIN), Inst Complex Mat) Skrotzki, Werner (Technische Universität Dresden) Eckert, Juergen (Österreichische Akademie der Wissenschaften (ÖAW))
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.
Number of pages:13
Date of publication:10.2016
Journal title:International Journal of Plasticity
Digital Object Identifier (DOI):http://dx.doi.org/10.1016/j.ijplas.2016.07.010
Publication Type:Article
Research Group Physics of Nanostructured Materials
Faculty of Physics

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