Microstructure and Properties of Lightweight Al2NbTixV2Zr High Entropy Alloy

• Published in: Journal of materials engineering and performance 2022-06, Vol.31 (6), p.4934-4944
• Main Authors: Zhi, Qian, Tan, Xinrong, Xie, Jilin, Liu, Yang, Yang, Kai, Zhang, Qiong, Liu, Wenhui, Liu, Zhongxia
• Format: Article
• Language: English
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Corrosion and Coatings; Engineering Design; Materials Science; Quality Control; Reliability; Safety and Risk; Technical Article; Tribology
• ISSN: 1059-9495; 1544-1024
• DOI: 10.1007/s11665-021-06571-w

Lightweight Al 2 NbTi x V 2 Zr ( x  = 1.0, 1.5, 2.0, 2.5, 3.0) high entropy alloys are fabricated through mechanical milling followed by vacuum hot pressing. The effect of Ti content on microstructure, hardness, mechanical behaviors, and corrosion property of the alloys are investigated. Microstructural studies reveal multiphase structures for this alloy, BCC solid solution matrix and α phase for Ti1.0 and for Ti1.5 alloys while β occurs in Ti2.0, Ti2.5 and Ti3.0 alloys. All sintered bulks exhibit low density in the range of 5.2-5.4 g/cm 3 . Hardness of Al 2 NbTi x V 2 Zr alloys fluctuates between 749 to 791 HV to various Ti contents. The varying tendency of hardness is closely related with the content of the secondary phase. The alloys show high yield strength and considerable strain during compression test. Comprehensive property of Al 2 NbTi x V 2 Zr system is superior to majority of other HEAs. The alloys display good anti-corrosion properties in HNO 3 , H 2 SO 4 , HCl, and NaCl solutions, and the corrosion property of Al 2 NbTi x V 2 Zr improves with the increasing of Ti content.