(1. 大連理工大學(xué) 三束材料改性教育部重點(diǎn)實(shí)驗(yàn)室，大連 116024； 2. 遼寧科技大學(xué) 激光先進(jìn)制造技術(shù)研發(fā)中心，鞍山 114051)
摘 要: 利用“團(tuán)簇+連接原子”結(jié)構(gòu)模型構(gòu)建了Ti-Fe-Zr-Y合金化雙團(tuán)簇模型，由此設(shè)計(jì)出成分為Ti64.52Fe29.32Zr5.86Y0.30的四元共晶合金，并利用激光快速成形技術(shù)在純鈦板上制備了該合金的成形體。利用X射線衍射儀、掃描電鏡、電子探針、3D表面輪廓儀、顯微硬度計(jì)、納米壓痕儀和電化學(xué)工作站，系統(tǒng)研究合金成形體的顯微組織、表面粗糙度、硬度、彈性模量和耐蝕性能，并與Ti70.60Fe29.40二元共晶合金成形體進(jìn)行了對(duì)比分析。結(jié)果表明：Ti64.52 Fe29.32 Zr5.86Y0.30合金呈現(xiàn)出細(xì)小的樹枝狀共晶組織形貌特征。釔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合金的硬度較Ti70.60Fe29.40合金的硬度提高了14%，彈性模量降低了32%，且該四元合金在Hank’s溶液中的耐蝕性明顯優(yōu)于Ti70.60Fe29.40二元共晶合金。
關(guān)鍵字: 鈦合金；激光快速成形；成分設(shè)計(jì)；組織；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
