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.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Bönisch M,Panigrahi A,Stoica M,Calin M,Ahrens E,Zehetbauer M,Skrotzki W,Eckert Jdoi
10.1038/s41467-017-01578-1subject
Has Abstractpub_date
2017-11-10 00:00:00pages
1429issue
1issn
2041-1723pii
10.1038/s41467-017-01578-1journal_volume
8pub_type
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