Optimization of High-Temperature Oxidation Resistance for Near-Α Ti Alloy by Scandium Addition

作     者：Zhong, Xiuyang Deng, Tongsheng Xiao, Wenlong Zhong, Ming Lai, Yunhao Ojo, Olanrewaju A. 

作者机构：Faculty of Materials Metallurgy and Chemistry Jiangxi University of Science and Technology Ganzhou341000 China School of Materials Science and Engineering Beihang University Beijing100191 China Department of Mechanical Engineering University of Manitoba WinnipegMBR3T 5V6 Canada 

出 版 物：《SSRN》 

年 卷 期：2023年

核心收录：

主　　题：Microstructure 

摘      要：In this study, the Ti-6.5Al-2.5Sn-9Zr-0.5Mo-1Nb-1W-0.3Si near-α titanium alloy was prepared by the rare-earth scandium (Sc) microalloying. Influences of Sc on microstructure and oxidation resistance were investigated by isothermal oxidation at 650 ℃. Results showed that Sc promotes oxides refinement, adjusts the distribution of Al2O3 scales and reduces flocculent oxides formation by W-element segregation. However, the addition of Sc in alloy accelerates the dissolution of the residual β phase and the precipitation of silicides, resulting in the cracking of the oxide films and deteriorating the oxidation resistance. Finally, the 0.3 wt.% Sc alloy exhibits superior resistance to high-temperature oxidation. © 2023, The Authors. All rights reserved.