Giant thermal expansion and α-precipitation pathways in Ti-Alloys
- Author(s)
- Matthias Boenisch, Ajit Panigrahi, Mihai Stoica, Mariana Calin, Eike Ahrens, Michael Zehetbauer, Werner Skrotzki, Juergen Eckert
- Abstract
Ti-Alloys represent the principal structural materials in both aerospace development and metallic biomaterials. Key to optimizing their mechanical and functional behaviour is in-depth know-how of their phases and the complex interplay of diffusive vs. displacive phase transformations to permit the tailoring of intricate microstructures across a wide spectrum of configurations. Here, we report on structural changes and phase transformations of Ti-Nb alloys during heating by in situ synchrotron diffraction. These materials exhibit anisotropic thermal expansion yielding some of the largest linear expansion coefficients (+ 163.9×10
-6 to-95.1×10
-6 °C
-1) ever reported. Moreover, we describe two pathways leading to the precipitation of the α-phase mediated by diffusion-based orthorhombic structures, α″
lean and α″
iso. Via coupling the lattice parameters to composition both phases evolve into α through rejection of Nb. These findings have the potential to promote new microstructural design approaches for Ti-Nb alloys and β-stabilized Ti-Alloys in general.
- Organisation(s)
- Physics of Nanostructured Materials
- External organisation(s)
- Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden, Technische Universität Dresden, Montanuniversität Leoben, Österreichische Akademie der Wissenschaften (ÖAW), Institute of Minerals and Materials Technology
- Journal
- Nature Communications
- Volume
- 8
- No. of pages
- 9
- ISSN
- 2041-1723
- DOI
- https://doi.org/10.1038/s41467-017-01578-1
- Publication date
- 11-2017
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103018 Materials physics
- Keywords
- ASJC Scopus subject areas
- General Physics and Astronomy, General Chemistry, General Biochemistry,Genetics and Molecular Biology
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/78c98f1b-79cb-488b-a01f-d88c8e16a27c