Abstract
The planar slip associated with the interaction between dislocations and α2 precipitates in titanium alloys was investigated using atomistic simulation and transmission electron microscopy. The simulation reveals that <a>-dislocations experience different critical resolved shear stress (CRSS) during their passing through the α2-Ti3Al particle. The CRSS of the first pass increases linearly with the particle diameter both in the prismatic and basal planes, resulting in the formation of the anti-phase boundary within particle, which decreases the CRSS of the second pass. This triggers a slip planarity that ends up of dislocation pairs. The present results provide a deeper understanding on the plasticity and fatigue of titanium alloys containing α2 precipitates.
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