Abstract
In present work, a hybrid-reinforced titanium alloy has been β forged and heat treated successively. The microstructure evolution, deformation mechanism and fracture behavior were investigated to evaluate the contribution of HT on strength. The fine zone was formed after HT at the prior β grain boundary, and the (TiB + TiC + Y2O3) reinforcement could significantly enlarged the area of fine zone and homogenized the microstructure. Silicide precipitation was also observed in intra lamellar and α/β boundary after HT, thereby increasing the strength via Orowan strengthening mechanism. In addition, the deformation mechanism analysis indicated that the grain boundary slip contributed a great effort to the high temperature deformation during tensile testing. Due to the formation of fine zone and silicide precipitation, the grain boundary strength and intragranular strengths both improved. However, the equal-strength temperature improved more thus leaded to a high yield strength in (TiB + TiC + Y2O3)/α-Ti composite after HT. This result also had a substantial influence on fracture morphology, which achieved considerable strength in the matrix and composite at elevated temperature.
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