A new metastable β type titanium alloy called TB-13 with the combination of excellent strength and ductility was developed successfully.In order to develop a perspective on this new alloy,the influence of several com...A new metastable β type titanium alloy called TB-13 with the combination of excellent strength and ductility was developed successfully.In order to develop a perspective on this new alloy,the influence of several commonly used heat treatments on the microstructure and properties was studied.In solution-treated and quenched samples,a low-temperature aging at 480°C results in the precipitation of finerαphase.The precipitation of coarserαphase plate at higher aging temperature(560°C)leads to the increase of tensile ductility but reduction of strength.During low-temperature aging at 300°C,quite homogeneous distribution of fine isothermalωphase particles was found.The isothermalωphase provides nucleation sites forαphase during two-step aging process and makesαphase extremely fine and disperse uniformly in β matrix.Thus,TB-13 alloy is strengthened and its mechanical properties are improved.展开更多
Recent studies suggest that the ratio of the shear modulus (G) to the bulk modulus (B) and the Poisson's ratio (ν) are good indicators of ductility.Using the method of supercell and the first-principles pseudopot...Recent studies suggest that the ratio of the shear modulus (G) to the bulk modulus (B) and the Poisson's ratio (ν) are good indicators of ductility.Using the method of supercell and the first-principles pseudopotential plane-wave method,the G/B and ν of the β-type Ti-Mo binary alloys with Mo molar fraction (xMo) ranging from 6.25% to 37.5% are calculated.The results show that the ductility of β-type Ti-Mo binary alloys first increases with increasing x Mo and reaches the maximum when x Mo is about 25%,and then reduces with more increasing x Mo.The charge density difference calculations suggest that the x Mo dependence of the ductility can be ascribed to the change of bonding characteristics between Ti and Mo atoms in the [111] direction.展开更多
基金The Project of Introducing Talents of Discipline to Universities(B08040)The International Cooperation Fund of the State Key Laboratory of Solidification Processing in NWPU
基金Project(2007CB613802)supported by the National Basic Research Program of ChinaProject(KP200912)supported by the Research Fund of the State Key Laboratory of Solidification Processing(NWPU),China
文摘A new metastable β type titanium alloy called TB-13 with the combination of excellent strength and ductility was developed successfully.In order to develop a perspective on this new alloy,the influence of several commonly used heat treatments on the microstructure and properties was studied.In solution-treated and quenched samples,a low-temperature aging at 480°C results in the precipitation of finerαphase.The precipitation of coarserαphase plate at higher aging temperature(560°C)leads to the increase of tensile ductility but reduction of strength.During low-temperature aging at 300°C,quite homogeneous distribution of fine isothermalωphase particles was found.The isothermalωphase provides nucleation sites forαphase during two-step aging process and makesαphase extremely fine and disperse uniformly in β matrix.Thus,TB-13 alloy is strengthened and its mechanical properties are improved.
基金the National Basic Research Program(973) of China (No.2007CB613802)the Research Fund of the State Key Laboratory of Solidification Processing of China (No.KP200912)
文摘Recent studies suggest that the ratio of the shear modulus (G) to the bulk modulus (B) and the Poisson's ratio (ν) are good indicators of ductility.Using the method of supercell and the first-principles pseudopotential plane-wave method,the G/B and ν of the β-type Ti-Mo binary alloys with Mo molar fraction (xMo) ranging from 6.25% to 37.5% are calculated.The results show that the ductility of β-type Ti-Mo binary alloys first increases with increasing x Mo and reaches the maximum when x Mo is about 25%,and then reduces with more increasing x Mo.The charge density difference calculations suggest that the x Mo dependence of the ductility can be ascribed to the change of bonding characteristics between Ti and Mo atoms in the [111] direction.
