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Characterization of Yttrium-Rich Precipitate Phases in a Titanium Alloy Weld



Andrew Herzing, Ratna P. Kolli, Sreeramamurthy Ankem


The yttrium-rich (Y-rich) precipitates that form in the fusion zone (FZ) of a Ti-5111 alloy weld were characterized by atom probe tomography and scanning transmission electron microscopy. Two distinct types of precipitates were identified: (1) a higher number density of a nanoscale YAl2 phase, and (2) a lower apparent number density of a larger Y-rich phase that is possibly Y2O3 or Y2O2S. Both types of precipitates can contribute to the reduced hardening and improved ductility of the FZ.
Materials Characterization


Titanium alloys, welding, yttrium, atom probe tomography, high-angle annular dark field, STEM, X-ray energy dispersive spectroscopy, XEDS


Herzing, A. , Kolli, R. and Ankem, S. (2016), Characterization of Yttrium-Rich Precipitate Phases in a Titanium Alloy Weld, Materials Characterization, [online], (Accessed June 21, 2024)


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Created December 1, 2016, Updated October 28, 2022