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Li, Jiayin; Liu, Shibo; Ma, Bowen; Chen, Dongxu; Lei, Xueqian; Li, Ruiyan; Qin, Yanguo; Li, Dongdong
Materials & design, July 2024, 2024-07-00, 2024-07-01, Letnik: 243Journal Article
Display omitted •Cu-rich particles with both homogeneous and hierarchical distribution were realized.•Ti2Cu precipitation favors superior abrasion resistance and antibacterial properties.•Hierarchical structure favors excellent combination of strength-plasticity.•Hierarchical structure provides a solution for the continuous release of Cu ions. How to precisely modulate the morphology and distribution of precipitated phases to have long-term antibacterial activity and outstanding strength-ductility has slowed the overall development and engineering applications of Cu-bearing biomedical titanium alloys. For the first time, the electron beam powder bed fusion (EBPBF) was employed to design titanium alloys with a completely solid solution, and containing fine Ti2Cu precipitates in both uniform and layered structures. The mechanical properties of the designed alloy with the layered (α-Ti and Ti2Cu) structure are superior to the other structures, especially with an outstanding compressive yield strength of 1221.9 MPa. Simultaneously, the wear resistance of the heterogeneous structures containing Ti2Cu precipitates was significantly improved, with a specific wear rate only half of that of the EBPBF-fabricated Ti6Al4V alloy. The compact arrangement of Ti2Cu phases created a large number of interfaces conducive to the formation of corrosion channels, which provided the capacity of continuous Cu2+ release. This work comprehensively analyzes the effects of heterogeneous structures on enhancing the sustained antibacterial capacity and optimizing the mechanical properties of a Cu-containing titanium alloy, laying a good foundation for their application in clinical and implantable devices.
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