The tensile properties before and after exposed at 600 ℃ for 100 h and creep strain at the condition of 600 ℃/150 MPa/100 h were measured for Ti 1100 and Ti 1100 with 0 1%(mass fraction) yttrium, respectively. Th...The tensile properties before and after exposed at 600 ℃ for 100 h and creep strain at the condition of 600 ℃/150 MPa/100 h were measured for Ti 1100 and Ti 1100 with 0 1%(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%Y to Ti 1100 is beneficial to the improvement of tensile ductility, thermal stability and creep property of the alloy, which is related to the microstructural changes, precipitated phases( α 2 phase and silicide) and dislocation structures resulted from the presence of Y 2O 3 oxide.展开更多
A new phase with the appropriate composition of Ti_3Co_2Si is found to exist at 1100℃. The X-ray diffraction of this phase can not be indexed by any other phase in the Ti-Co-Si ternary system and show this phase to b...A new phase with the appropriate composition of Ti_3Co_2Si is found to exist at 1100℃. The X-ray diffraction of this phase can not be indexed by any other phase in the Ti-Co-Si ternary system and show this phase to be hexagonal with the lattice parameter of α=0.676 nm, c=0.732 nm, c/α=1.0825.展开更多
文摘The tensile properties before and after exposed at 600 ℃ for 100 h and creep strain at the condition of 600 ℃/150 MPa/100 h were measured for Ti 1100 and Ti 1100 with 0 1%(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%Y to Ti 1100 is beneficial to the improvement of tensile ductility, thermal stability and creep property of the alloy, which is related to the microstructural changes, precipitated phases( α 2 phase and silicide) and dislocation structures resulted from the presence of Y 2O 3 oxide.
文摘A new phase with the appropriate composition of Ti_3Co_2Si is found to exist at 1100℃. The X-ray diffraction of this phase can not be indexed by any other phase in the Ti-Co-Si ternary system and show this phase to be hexagonal with the lattice parameter of α=0.676 nm, c=0.732 nm, c/α=1.0825.
