Publications

Revisiting ω phase embrittlement in metastable β titanium alloys: Role of elemental partitioning

Lai, M.J. and Li, T. and Yan, F.K. and Li, J.S. and Raabe, D.

SCRIPTA MATERIALIA
Volume: 193 Pages: 38-42
DOI: 10.1016/j.scriptamat.2020.10.031
Published: 2021

Abstract
The role of elemental partitioning between β and ω phase in embrittling an originally ductile ω-containing Ti–12Mo (wt.%) model alloy was studied using transmission electron microscopy and atom probe tomography. It is revealed that the embrittlement of this alloy already occurs after aging at 400 °C for as short as 10 min, when the size, inter-particle spacing and volume fraction of the ω particles remain almost unchanged. The origin of the aging-induced embrittlement is attributed to the significant rejection of Mo (>5 at.%) from the ω particles during aging, which leads to remarkable increase in the shear modulus (>30 GPa) of the ω particles, promoting intense plastic flow localization and facilitating crack nucleation prior to macroscopic yielding. © 2020

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