Abstract: The microstructure, tensile properties and deformation mechanisms of non-burning β titanium alloy Ti-25V-15Cr-2Al-0.2C (mass fraction, %) were investigated. The results show that, (Ti, V)C and α are two main precipitation phases in the β matrix of the alloy; after long-term exposure (540℃, 100h), the ductility of the alloy is decreased drastically, mainly due to a continuous α film formed at β grain boundaries; a low degree of short range ordering (SRO) of the β matrix occurs during long-term exposure at 540℃, which impairs the thermal stability of the alloy to a certain degree; the ordinary dislocation slip is the main mode of room plastic deformation of the alloy; a small number of planar slip bands appear in the deformation structure of the alloy after long-term exposure; dislocation cross-slip and climb are the important deformation modes of the alloy at 540℃.
Microstructure, tensile properties and deformation mechanisms of Ti-25V-15Cr-2Al-0.2C alloy
Abstract:
The microstructure, tensile properties and deformation mechanisms of nonburning β titanium alloy Ti25V15Cr2Al0.2C (mass fraction, %) were investigated. The results show that, (Ti, V)C and α are two main precipitation phases in the β matrix of the alloy; after longterm exposure (540 ℃, 100 h), the ductility of the alloy is decreased drastically, mainly due to a continuous α film formed at β grain boundaries; a low degree of short range ordering (SRO) of the β matrix occurs during longterm exposure at 540 ℃, which impairs the thermal stability of the alloy to a certain degree; the ordinary dislocation slip is the main mode of room plastic deformation of the alloy; a small number of planar slip bands appear in the deformation structure of the alloy after longterm exposure; dislocation crossslip and climb are the important deformation modes of the alloy at 540 ℃.