Ultra-strong lightweight TiAlVSc multi-principal element alloys for elevated temperature applications

Ultra-strong lightweight TiAlVSc multi-principal element alloys for elevated temperature applications

Materials & Design

10.1016/j.matdes.2025.114992

https://doi.org/10.1016/j.matdes.2025.114992

Mengxing Li, Ming Lin, Jing Jun Lee, Si Rong Ng, Li Tian Chew, Delvin Wuu, Augustine Cheong, Xiaoxiang Wu, Likun Xin, Hongli Suo, Andrew Chun Yong Ngo, Pei Wang, Zhongji Sun, Chee Koon Ng

23 October 2025

Li, M., Lin, M., Lee, J. J., Ng, S. R., Chew, L. T., Wuu, D., Cheong, A., Wu, X., Xin, L., Suo, H., Ngo, A. C. Y., Wang, P., Sun, Z., & Ng, C. K. (2025). Ultra-strong lightweight TiAlVSc multi-principal element alloys for elevated temperature applications. Materials & Design, 260, 114992. https://doi.org/10.1016/j.matdes.2025.114992

Lightweight multi-principal element alloys (MPEAs) have received significant attention in aerospace materials research due to their low density and excellent high-temperature performance. Rare earth elements, with their unique thermophysical properties, play a crucial role in enhancing the high-temperature performance of alloys. In this study, the effects of Sc on the microstructure and mechanical properties of Ti60-xAl30V10Scx (x = 0, 3.5, 6.5 at. %) MPEAs at different temperatures were systematically investigated. Contrary to common belief, the strength of the material remains consistent up to 900 °C. The addition of Sc also significantly improves the high-temperature strength of the alloys at 1000 °C, with Sc3.5 and Sc6.5 alloys having high-temperature strengths of 3.3 and 2.6 times compared to the Sc0 alloy. Moreover, the addition of Sc leads to significant changes in the microstructure of the as-cast alloy. The mechanism of the significant enhancement of high-temperature properties by Sc elements is rationalized by the BCC/B2 to α2 phase transitions during high-temperature deformation. This study demonstrates that Sc can effectively enhance the high temperature strengths of Ti-Al-V-based MPEAs, providing critical experimental insights and theoretical support for high-temperature alloy design.

Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)

This research / project is supported by the National Research Foundation - AI Singapore Materials Grand Challenge
Grant Reference no. : AISG2-GC-2023-010

This research / project is supported by the A*STAR - Manufacturing, Trade and Connectivity (MTC) Industry Alignment Fund- Pre-Positioning (IAF-PP)
Grant Reference no. : M22K7a0047

https://oar.a-star.edu.sg/communities-collections/articles/22670

0264-1275

Institute of Materials Research and Engineering

https://doi.org/10.1016/j.matdes.2025.114992