Affiliation:
1. Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin, China
2. Yantai Graduate School of Harbin Engineering University, Yantai, China
Abstract
Achieving the development of ultra-light Al–Li alloys with high strength and excellent corrosion resistance is always a challenge. In this study, the precipitation characteristics and electrochemical corrosion behaviours after isothermal aging of cast Al–Li alloys with two different Li contents were comparatively analysed. The results showed that the increase in Li content from 0.7 wt-% to 1.3 wt-% retarded the peak hardening and improved the Al–Li alloy hardness and strength by promoting the precipitation of the S′ (Al2CuMg) and T1 (Al2CuLi) phases. Besides, the galvanic coupling corrosion of the alloying element Cu with the aluminium matrix was reduced by more Li addition, thus improving the corrosion resistance of the alloy.
Funder
State Key Laboratory of New Ceramic and Fine Processing Tsinghua University
Outstanding Youth Fund of Heilongjiang Natural Science Foundation
Central University Foundation of Harbin Engineering University, Start-up Fund of Heilongjiang Province Postdoctoral Research, Fund of Key Laboratory of Advanced Materials of Ministry of Education
National Natural Sciences Foundation of China