Abstract
Near-α high-temperature titanium alloys suffer from low ductility due to silicide and α2 (Ti3Al) precipitates. This study explores how adjusting the Al/Zr ratio affects these precipitates and their impact on ductility. Dispersed silicide precipitates activate the pyramidal <c+a> slip systems, enhancing ductility by limiting basal <a> slip. Conversely, α2 nanoparticles promote basal <a> slip, resulting in planar dislocations and reduced ductility. These findings offer a new strategy for balancing strength and ductility in near-α high-temperature titanium alloys through controlled precipitation.
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