Simultaneously enhanced strength and ductility in hybrid direct laser deposited and in-situ rolled Ti–10V–2Fe–3Al

In general, the microstructure of direct laser deposited (DLD) titanium alloy had a coarse or columnar prior β grains, which cannot satisfy the demand of high strength and ductility. In this study, a hybrid DLD and in-situ rolling technique was utilized for the fabrication of Ti–10V–2Fe–3Al alloy to manipulate the microstructure and optimize the tensile property. It has been found that DLD specimen had a relatively lower yield strength due to the coarse intragranular α lath. A higher in-situ rolling load at 8 kN increased the yield strength but deteriorated the ductility due to the formation of continuous grain boundary α GB . An appropriate in-situ rolling load at 2 kN contributed to the refinement of both prior β grains and intragranular α, which resulted in improved yield strength compared to the other two counterparts. In addition, the shortest thermal cycling time in the intergranular α GB precipitation temperature interval provided a discontinuous grain boundary α GB and the highest ductility in the specimen in-situ rolled at 2 kN.