Titanium alloy cast ingot containing stable beta phase and preparation method of titanium alloy cast ingot

The invention discloses a titanium alloy cast ingot containing a stable beta phase and a preparation method of the titanium alloy cast ingot, the titanium alloy cast ingot comprises two phases, namely the stable beta phase and a copper-containing phase, and the titanium alloy cast ingot comprises the following elements in percentage by mass: 37-38% of Nb, 3-5% of Zr and 7-10% of Cu. According to the preparation method, generation of alpha phases is reduced through the specific Ti-Nb-Zr-Cu element ratio and the combination of the water-cooling copper mold negative pressure suction casting process and the step quenching process, so that stable beta phases are obtained, and the prepared titanium alloy cast ingot has high strength, low modulus and excellent antibacterial property and can meet the requirements of biomedical metal. 本发明公开一种含稳定β相钛合金铸锭及其制备方法，所述钛合金铸锭包含两种相，稳定的β相及含铜相，按质量百分比计，其成分由以下元素组成：Nb：37～38％，Zr：3～5％，Cu：7～10％。本发明通过Ti-Nb-Zr-Cu特定的元素配比以及水冷铜模负压吸铸工艺结合分级淬火工艺减少α相的产生，以得到稳定β相，使得制备的钛合金铸锭具有高强度低模量同时具备优良的抗菌性，能够满足生