Interface characteristics in an α+β titanium alloy

Abigail K. Ackerman, Vassili A. Vorontsov, Ioannis Bantounas, Yufeng Zheng, Yanhong Chang, Thomas McAuliffe, William A. Clark, Hamish L. Fraser, Baptiste Gault, David Rugg, David Dye

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Abstract

The α/β interface in Ti-6Al-2Sn-4Zr-6Mo (Ti-6246) was investigated via center of symmetry analysis, both as-grown and after 10% cold work. Semicoherent interface steps are observed at a spacing of 4.5±1.13 atoms in the as-grown condition, in good agreement with theory. Lattice accommodation is observed, with elongation along [1210]α and contraction along [1010]α. Deformed α exhibited larger, less coherent steps with slip bands lying in {110}β. This indicates dislocation pile-up at the grain boundary, a precursor to globularization during heat treatment. Atom probe tomography measurements of secondary α plates in the fully heat-treated condition showed a Zr excess at the interface, which was localized into regular structures indicative of Zr association with interface defects, such as dislocations. Such chemo-mechanical stabilization of the interface defects would both inhibit plate growth during elevated temperature service and the interaction of interface defects with gliding dislocations during deformation.

Original languageEnglish
Article number013602
Number of pages7
JournalPhysical Review Materials
Volume4
Issue number1
DOIs
Publication statusPublished - 9 Jan 2020

Keywords

  • titanium alloy
  • topological models

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