Wang Zhe, Fu Binguo, Wang Yufeng, Dong Tianshun, Li Jingkun, Li Guolu, Zhao Xuebo, Liu Jinhai, Zhang Guixian
School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300401, China.
Tianjin Institute of Aerospace Mechanical and Electrical Equipment, Tianjin 300301, China.
Materials (Basel). 2022 Feb 24;15(5):1696. doi: 10.3390/ma15051696.
Ti-Cu alloys have broad application prospects in the biomedical field due to their excellent properties. The properties of Ti-Cu alloys are strongly dependent on Cu content, microstructures, its Ti2Cu phase and its preparation process. The aim of this work is to investigate the effect of Cu content on the precipitation behaviors, mechanical and corrosion properties of the as-cast Ti-Cu alloys. The microstructures and phase evolution were characterized by SEM and TEM, and the properties were studied by tensile and electrochemical test. The results show that the volume fraction of Ti2Cu phase increases with the increase of Cu content. The Ti2Cu phase presents a variety of microscopic morphologies with different Cu content, such as rod, granular, lath and block shaped. The crystal orientation relationships between the Ti2Cu and α-Ti matrix in Ti-4Cu and Ti-10Cu alloys are (103)Ti2Cu//(0[11¯11)α-Ti, [3¯01]Ti2Cu//[21¯1¯0]α-Ti, and (103)Ti2Cu//(0002)α-Ti, [3¯31]Ti2Cu//[12¯10]α-Ti, respectively. The tensile strength, Vickers hardness and Young’s modulus of the Ti-Cu alloys increase with the increase of Cu content, whereas the elongation decreases. The fracture morphologies of these alloys reveal ductile, ductile-brittle hybrid, and cleavage brittle mode, respectively. The corrosion resistance of the Ti-Cu alloys in SBF solution can be described as: Ti-4Cu alloy > Ti-10Cu alloy > Ti-7Cu alloy. The volume fraction of Ti2Cu phases and the “protective barrier” provided by the fine lath Ti2Cu phases strongly affected the electrochemical performances of the alloys.
钛铜合金因其优异的性能在生物医学领域具有广阔的应用前景。钛铜合金的性能强烈依赖于铜含量、微观结构、其Ti2Cu相及其制备工艺。本工作的目的是研究铜含量对铸态钛铜合金析出行为、力学性能和腐蚀性能的影响。通过扫描电子显微镜（SEM）和透射电子显微镜（TEM）对微观结构和相演变进行了表征，并通过拉伸和电化学测试对性能进行了研究。结果表明，Ti2Cu相的体积分数随铜含量的增加而增加。Ti2Cu相在不同铜含量下呈现出多种微观形态，如棒状、颗粒状、板条状和块状。Ti-4Cu和Ti-10Cu合金中Ti2Cu相与α-Ti基体之间的晶体取向关系分别为(103)Ti2Cu//(0[11¯11)α-Ti, [3¯01]Ti2Cu//[21¯1¯0]α-Ti，以及(103)Ti2Cu//(0002)α-Ti, [3¯31]Ti2Cu//[12¯10]α-Ti。钛铜合金的抗拉强度、维氏硬度和杨氏模量随铜含量的增加而增加，而伸长率则降低。这些合金的断口形貌分别呈现出韧性、韧脆混合和解理脆性模式。钛铜合金在模拟体液（SBF）溶液中的耐蚀性可描述为：Ti-4Cu合金>Ti-10Cu合金>Ti-7Cu合金。Ti2Cu相的体积分数以及细小板条状Ti2Cu相提供的“保护屏障”对合金的电化学性能有强烈影响。
