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arXiv · 1805.09882

Interface characteristics in an {\alpha}+{\beta} titanium alloy

Abigail K. Ackerman·Vassili A. Vorontsov·Ioannis Bantounas·Yufeng Zheng·Thomas McAuliffe·William A. Clark·Hamish L. Fraser·David Rugg·David Dye
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Abstract

The alpha/beta interface in Ti-6Al-2Sn-4Zr-6Mo (Ti-6246) is investigated via centre of symmetry analysis, both as-grown and after 10% cold work. Semi-coherent interface steps are observed at a spacing of 4.5 +/-1.13 atoms in the as-grown condition, in good agreement with theory prediction (4.37 atoms). Lattice accommodation is observed, with elongation along [-1 2 -1 0]alpha and contraction along [1 0 -1 0]alpha . Deformed alpha exhibited larger, less coherent steps with slip bands lying in {110}beta. This indicates dislocation pile-up at the grain boundary, a precursor to globularisation, offering insight into the effect of deformation processing on the interface, which is important for titanium alloy processing route design.

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Abigail K. Ackerman, Vassili A. Vorontsov, Ioannis Bantounas, Yufeng Zheng, Thomas McAuliffe, William A. Clark, Hamish L. Fraser, David Rugg, David Dye. 2018-05-24. Interface characteristics in an {\alpha}+{\beta} titanium alloy. https://doi.org/10.1103/physrevmaterials.4.013602

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