Giant thermal expansion and α-precipitation pathways in Ti-alloys.

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 Commun

journal_title

Nature communications

authors

Bönisch M,Panigrahi A,Stoica M,Calin M,Ahrens E,Zehetbauer M,Skrotzki W,Eckert J

doi

10.1038/s41467-017-01578-1

subject

Has Abstract

pub_date

2017-11-10 00:00:00

pages

1429

issue

1

issn

2041-1723

pii

10.1038/s41467-017-01578-1

journal_volume

8

pub_type

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