(1. 大连理工大学 三束材料改性教育部重点实验室，大连 116024； 2. 辽宁科技大学 激光先进制造技术研发中心，鞍山 114051)
摘 要: 利用“团簇+连接原子”结构模型构建了Ti-Fe-Zr-Y合金化双团簇模型，由此设计出成分为Ti64.52Fe29.32Zr5.86Y0.30的四元共晶合金，并利用激光快速成形技术在纯钛板上制备了该合金的成形体。利用X射线衍射仪、扫描电镜、电子探针、3D表面轮廓仪、显微硬度计、纳米压痕仪和电化学工作站，系统研究合金成形体的显微组织、表面粗糙度、硬度、弹性模量和耐蚀性能，并与Ti70.60Fe29.40二元共晶合金成形体进行了对比分析。结果表明：Ti64.52 Fe29.32 Zr5.86Y0.30合金呈现出细小的树枝状共晶组织形貌特征。钇的添加有效地抑制了Ti4Fe2O氧化物的形成，并增加了合金的成形性。Ti64.52Fe29.32Zr5.86Y0.30合金的硬度较Ti70.60Fe29.40合金的硬度提高了14%，弹性模量降低了32%，且该四元合金在Hank’s溶液中的耐蚀性明显优于Ti70.60Fe29.40二元共晶合金。
关键字: 钛合金；激光快速成形；成分设计；组织；性能
（1. Key Laboratory for Materials Modification by Laser, Ion, and Electron Beams, Ministry of Education, Dalian University of Technology, Dalian 116023, China; 2. Laser Advanced Manufacturing Technology Center, University of Science and Technology Liaoning, Anshan 114051, China）
Abstract:A Ti64.52Fe29.32 Zr5.86Y0.30 alloy was designed through a “cluster-plus-glue-atom” model, and then was prepared by laser rapid prototyping on pure titanium substrate. The microstructure, formability, hardness, elastic modulus, and corrosion resistance of the alloy were investigated by X-ray diffraction, scanning electron microscopy, 3D surface profiler, micro-hardness tester, nano indenter and electrochemical work station, and comparative analysis with Ti70.60Fe29.40 binary eutectic alloy was conducted. The results show that the microstructure of the Ti64.52Fe29.32 Zr5.86Y0.30 alloy is featured with dendritic eutectic structure. Y addition not only suppresses the formation of Ti4Fe2O oxide, but also improves the formability of the alloy. The hardness of the Ti64.52Fe29.32 Zr5.86Y0.30 alloy is improved by 14% compared with that of Ti70.60Fe29.40 alloy. Whereas the elastic modulus is reduced by 32%. Moreover, the corrosion resistance of Ti64.52Fe29.32- Zr5.86Y0.30 alloy is superior to that of Ti70.60Fe29.40 alloy in Hank’s solution.
Key words: titanium alloy; laser rapid prototyping; composition design; microstructure; property
