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用金相法和x射线衍射法研究了一种在室温亚稳β型的钛合金。合金中除钛外主要含有约5%Mo,5%V,8%Cr和3%Al。样品在900℃固溶处理后冰水淬到室温,以及继续冷到液氦温度4.2K都只有β相存在。这说明本研究所用钛合金(以下简称TB_2)的马氏体点(Ms)低于4.2K。TB_2合金自β单相区淬火到室温没有见到ω相,这说明此合金或者不生成变温ω相,或者生成的ω相不能稳定到室温。透射电子显微镜研究证明了TB2合金在300℃时效50小时后析出大量恒温ω相,在样品的局部区域观察到溶质元素贫化的β′相。
A metastable β-type titanium alloy at room temperature was studied by metallography and X-ray diffraction. In addition to titanium alloy containing mainly about 5% Mo, 5% V, 8% Cr and 3% Al. After the sample was solution treated at 900 ℃, ice water quenched to room temperature, and continued to cold liquid helium temperature of 4.2K only β phase exists. This indicates that the martensitic point (Ms) of the titanium alloy used in this study (hereinafter referred to as TB_2) is lower than 4.2K. The phase of TB_2 alloy was quenched from β single phase to room temperature and the phase ω was not observed. This indicated that the alloy either did not produce temperature ω phase or the generated ω phase could not be stabilized to room temperature. Transmission electron microscopy studies demonstrated that a large amount of isothermal ω phase was precipitated in the TB2 alloy after aging at 300 ℃ for 50 hours and a β ’phase depleted in solute element was observed in the local area of the sample.