Achieving High Yield Strength and Low Modulus in Biomedical β‐type Ti‐24Nb‐4Sn‐6Zr Alloy via Cold Rolling and Ageing Treatment

β‐Titanium alloys have been widely used in bone implants due to their excellent corrosion resistance and biocompatibility. However, achieving simultaneous high yield strength and low elastic modulus remains a significant challenge. In this study, the yield strength of the as‐cast alloy is enhanced through cold rolling and ageing treatment. The cold‐rolled Ti‐24Nb‐4Sn‐6Zr alloy still maintains β single‐phase structure and forms {001}<110> texture, and high‐density dislocation tangles are found in the transmission electron microscopy image. After ageing treatment, two types of acicular nanosized α phases are formed in β‐Ti alloy, with significant Ti elemental segregation phenomenon observed within the α phases. After tensile deformation, a high density of dislocations distributes around the fine α phase. Through the Orowan strengthening mechanism, the yield strength of the Ti‐24Nb‐4Sn‐6Zr alloy is increased to 1065 MPa, while maintaining a low elastic modulus of 33 GPa. Subsequently, biocompatibility tests are conducted on this alloy. The survival rate of L929 cells remained above 75%, indicating that the material did not show significant cytotoxicity. The Ti‐24Nb‐4Sn‐6Zr alloy designed in this study effectively addresses the issues of strength‐modulus mismatch and cytotoxicity in traditional implant materials, offering a novel approach for developing biomedical β‐Ti alloys.