Plastic slip mechanisms in high-temperature titanium alloys: Insights into silicide and Ti3Al precipitates on ductility

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.