Effect of boron on microstructure and mechanical properties of thermomechanically processed near alpha titanium alloy Ti-1100

► No improvement in mechanical properties were found on addition of 0.2 wt.% boron in Ti-1100 alloy in the as cast condition even though there was significant refinement in the microstructure. ► Ti-1100 alloy with 0.2 wt.% boron exhibited a higher yield strength, ultimate tensile strength and similar ductility as compared to the base alloy at room temperature in the thermomechanically (α–β rolled) and standard heat treatment condition. The results were in-line with the predictions of a model based on treating the material as a metal matrix composite with aligned but fragmented whiskers. ► No discernible trend in the variation of yield strength and UTS in boron containing Ti-1100 alloy was observed with change in heat treatment (i.e. solution treatment condition) either at room temperature or at 600 °C although they broadly follow the change in the matrix yield strength and UTS. ► The mechanical properties of the Ti-1100 alloy with 0.2 wt.% boron was also found to better than that of the base alloy at 600 °C. The effect of 0.2 wt.% of boron on the mechanical properties of Ti-1100, a near α titanium alloy, was evaluated at room temperature and at 600 °C in the as cast and thermomechanically processed (α–β rolled) condition after subjecting it to different heat treatments. Boron addition in Ti-1100 significantly refined the microstructure in the as cast condition but the mechanical properties did not show any improvement. However, in the thermomechanically processed (α–β rolled) and standard heat treatment condition, the yield strength (YS) and ultimate tensile strength (UTS) of the boron containing alloy increased significantly without any drop in elongation-to-failure as compared to the base alloy at both room temperature and 600 °C. No discernible trend was seen in YS and UTS in boron containing alloy with change in solution treatment temperature either at room temperature or at 600 °C.