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采用迅速水冷保留高温组织状态的方法,研究TC6钛合金在两相区加热和冷却过程中的相转变。结果表明:在加热过程中,次生α相会在700~850℃时优先固溶,初生α相在900℃时才会固溶,能谱分析结果表明,初生α相中Al元素浓度高于次生α相中Al元素浓度,因此初生α相在高温下更加稳定。在冷却过程中初生α相优先长大,而次生α相由于是通过形核长大,表现为在较低温度段才开始析出,且次生α相析出会降低初生α相的长大速度;进一步研究发现,冷却过程中次生α相析出温度会随着保温温度的降低而逐渐降低。
The phase transition of TC6 titanium alloy during heating and cooling in two-phase region was studied by rapid water-cooling to preserve the microstructure at high temperature. The results show that during the heating process, the secondary α phase will preferentially dissolve at 700 ~ 850 ℃ and the primary α phase will not dissolve at 900 ℃. The results of energy spectrum analysis show that the concentration of Al in the primary α phase is higher than Secondary alpha phase Al element concentration, so the primary alpha phase is more stable at high temperatures. The primary alpha phase grows preferentially during cooling, while the secondary alpha phase begins to nucleate and appears as precipitating at lower temperature. The secondary alpha phase precipitation will reduce the growth rate of primary alpha phase Further studies showed that the precipitation temperature of secondary α phase decreased gradually with the decrease of holding temperature.