Die u:cris Detailansicht:
Giant thermal expansion and α-precipitation pathways in Ti-Alloys
- Autor(en)
- Matthias Boenisch, Ajit Panigrahi, Mihai Stoica, Mariana Calin, Eike Ahrens, Michael Zehetbauer, Werner Skrotzki, Juergen Eckert
- Abstrakt
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(en)
- Physik Nanostrukturierter Materialien
- Externe Organisation(en)
- Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden, Technische Universität Dresden, Montanuniversität Leoben, Österreichische Akademie der Wissenschaften (ÖAW), Institute of Minerals and Materials Technology, Bhubaneswar
- Journal
- Nature Communications
- Band
- 8
- Anzahl der Seiten
- 9
- ISSN
- 2041-1723
- DOI
- https://doi.org/10.1038/s41467-017-01578-1
- Publikationsdatum
- 11-2017
- Peer-reviewed
- Ja
- ÖFOS 2012
- 103018 Materialphysik
- Schlagwörter
- ASJC Scopus Sachgebiete
- Allgemeine Physik und Astronomie, Allgemeine Chemie, Allgemeine Biochemie, Genetik und Molekularbiologie
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/78c98f1b-79cb-488b-a01f-d88c8e16a27c