Since the excellent solid solution strengthening of the β-stabilizer (Co), Ti-24Nb-4Zr-XCo (X = 0.5, 1, 1.5 at.%) alloys are prepared in arc melting, cold rolled, and heat treated followed by air cooled (at 823 K and 1023 K for 1.2 ks). The results indicate that micro-additions of Co strongly affect the mechanical properties and corrosion resistance of β titanium alloys. XRD and OM analyses reveal that the Co enhances the recovery and recrystallization process and strengthens the stability of β phase against β → ω phase transformation. Tensile test and Vickers hardness test indicate that the tensile strength and hardness heighten with increasing Co content, while relatively high plastic strain is retained. The Ti-24Nb-4Zr-1.5Co alloy performs highest strength (about 700 MPa), high plastic strain (19%), and low elastic modulus (75 GPa), making it a prospective implant for biomedical applications. Electrochemical corrosion test shows that the corrosion resistance weakens with an increase in Co content due to effect of the ω phase, but addition of 1.5 Co can inhibit the precipitation of ω phase and prevent the deterioration to some extent.

由于β稳定剂（Co）具有出色的固溶强化性能，因此以电弧熔化，冷轧和热处理的方式制备了Ti-24Nb-4Zr-XCo（X = 0.5，1，1.5 at。％）合金。冷却（在823 K和1023 K下持续1.2 ks）。结果表明，微量添加Co强烈影响β钛合金的力学性能和耐蚀性。XRD和OM分析表明，Co增强了回收和重结晶过程，增强了β相对抗β→ω相变的稳定性。拉伸试验和维氏硬度试验表明，随着Co含量的增加，抗拉强度和硬度升高，同时保持了较高的塑性应变。Ti-24Nb-4Zr-1.5Co合金具有最高的强度（约700 MPa），高的塑性应变（19％）和低的弹性模量（75 GPa），使其成为生物医学应用的潜在植入物。电化学腐蚀试验表明，由于ω相的影响，耐蚀性随Co含量的增加而降低，但加入1.5 Co可抑制ω相的析出并在一定程度上防止变质。