固溶温度对TB6钛合金动态力学性能和微观组织的影响

The effect of solution temperature on the dynamic mechanical properties and microstructure of near-β-phase TB6 titanium alloy was studied. Dynamic compression tests were carried out through the split Hopkinson pressure bar (SHPB) system, with untreated and treated TB6 titanium alloy specimens. The results indicate that both the untreated and treated TB6 titanium alloys perform the strengthening effect of strain rate, and their compression mode is exhibited as the typical shear failure. The solution temperature that converts the strain hardening of TB6 into strain softening is ranging from 700 ℃ to 750 ℃. The microscopic performance characterized by optical microscope (OM), X-ray diffraction (XRD) and scanning electron microscopy (SEM) methods show that the primary α-phase in TB6 is partially dissolved and the strength decreases after a solution treatment at 700 ℃. When the solution treatment is equal to or greater than 750 ℃, the primary α-phase is completely transformed into β-phase. The β grain becomes bigger and the strength increases, but the plasticity decreases evidently.