Effect of Yttrium on Mechanical Properties, Thermal Stability and Creep Resistance of High Temperature Titanium Alloy Ti-1100

摘要

The tensile properties before and after exposed at 600 deg C for 100 hu and creep strain at the condition of 600 deg C/150 MPa/100 h were measured for Ti-1100 and Ti-1100 with 0.1/100 (mass fraction) yttrium, respectively. The microstructures of unexposed and thermally exposed specimens were studied by optical microscopy and transmission electron microscopy. The addition of 0.1/100 Y to Tui-1100 is beneficial to the improvement of tensile ductility, thermal stability and creep property of the alloy, which is related to the microstructure changes, precipitated phases (a_2 phase and silicide) and dislocation structures resulted from the presence of Y_2O_3 oxide.