Microstructure， electrochemical， wear and corrosive wear performance of laser-based powder bed fusion(lpbf) and wrought biomedical Ti-6Al-4V alloys

作     者：A.G.Lekatou B.V.Efremenko V.Haoui V.G.Efremenko S.Emmanouilidou V.I.Zurnadzhy I.Petryshynets Yu.G.Chabak I.I.Sili 

作者机构：Laboratory of Applied Metallurgy， Department of Materials Science and Engineering， School of Engineering， University of Ioannina Institute of Materials Science and Computing， University Research Center of Ioannina (URCI) Pryazovskyi State Technical University， Department of Physics Institute of Materials Research of Slovak Academy of Sciences 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报(英文版))

年 卷 期：2024年

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基　　金：supported by the Ministry of Education and Science of Ukraine (project No. 0123U101834) 

摘      要：Wrought and laser powder bed fusion （LPBF） Ti-6Al-4V specimens were comparatively evaluated， with the objective to determine LPBF Ti-6-4’s suitability for biomedical applications. Testing included nanoindentation， cyclic polarization in simulated body fluid （SBF， 37 ℃ ）， and dry and SBF “Ball-on-Plate sliding. Wrought Ti-6-4 exhibited a lamellar （α+β） microstructure， whereas LPBF displayed a fine-grained α -martensite microstructure. LPBF Ti-6-4 demonstrated ～3% higher indentation modulus and ～32% higher hardness， while wrought Ti-6-4 showed ～8% higher plasticity. Both alloys exhibited low corrosion rates (10–5mA/cm2order) and true passivity (10–4mA/cm2order). No localized corrosion was observed in either alloy， except for occasional metastable pitting in the LPBF alloy. However， LPBF Ti-6-4 presented higher corrosion rate and passive current， ascribed to its martensitic structure. During dry sliding， LPBF Ti-6-4 exhibited ～14% lower volume loss compared to wrought Ti-6-4. Sliding in SBF increased volume losses for both alloys， with wear resistances nearly equalized， as the advantage of LPBF Ti-6-4 decreased due to more intensive wear-accelerated corrosion induced by the stressed martensite. Overall， the results demonstrate the suitability of LPBF Ti-6Al-4V for biomedical uses.