Abstract
The influence of sintering temperatures on the microstructure and properties of network-strengthened (La2O3+TiB)/Ti2AlNb composites were investigated in this study. Microstructural characterization results showed that the reinforced phases comprised of B27-type TiB and La2O3 would in-situ form with transition phases disappearing. Also, the TiB held a fixed crystallographic orientation relationship with α2-Ti3Al phase. The excess precipitation of α2, voids and the agglomeration of reinforced phases in prior particle boundaries (PPBs) area were faded away with the sintering temperature increasing. Tensile test results demonstrated the composite sintered at 1250 °C exhibited a superior tensile strength of 1095 and 853 MPa at 25 and 650 °C, respectively. Pores, the agglomeration of the reinforced phases and massive α2 in PPBs area would promote premature rupture and cause a low tensile strength. When the premature failure was avoided, a high TiB aspect ratio was favorable to strengthening.
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