Effect of Cu Content on the Precipitation Behaviors,Mechanical and Corrosion Properties of As-Cast Ti-Cu Alloys期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Effect of Cu Content on the Precipitation Behaviors,Mechanical and Corrosion Properties of As-Cast Ti-Cu Alloys

Authors:	Zhe Wang Binguo Fu Yufeng Wang Tianshun Dong Jingkun Li Guolu Li Xuebo Zhao Jinhai Liu Guixian Zhang

Affiliation:	1.School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300401, China; (Z.W.); (T.D.); (J.L.); (G.L.); (X.Z.); (J.L.);2.Tianjin Institute of Aerospace Mechanical and Electrical Equipment, Tianjin 300301, China;3.Key Laboratory of Research and Application of Mould Materials for Glass and Rubber in Hebei Province, Cangzhou 061100, China;

Abstract:	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[1 $\bar{1}$ 11)_α-Ti, [ $\bar{3}$ 01]_Ti2Cu//[2 $\bar{1} \bar{1}$ 0]_α-Ti, and (103)_Ti2Cu//(0002)_α-Ti, [ $\bar{3}$ 31]_Ti2Cu//[1 $\bar{2}$ 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.

Keywords:	Ti-Cu alloy Ti₂Cu phase microstructure mechanical property corrosion resistance

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