The researchers also found that the morphology of the precipitates varied depending on the concentration of solute Ti in the alloy matrix. During creep, the precipitates coarsened locally in the Ti-rich regions. The coarsened precipitates consisted of a plate-shaped Ti-rich phase surrounded by T-Al6Mg11Zn11 phase precipitates.
The findings of this study have important implications for the development of high-temperature creep-resistant aluminum alloys. The addition of trace amounts of Ti is a promising approach to improving the creep resistance of these alloys. The research also highlights the importance of controlling the distribution of solute Ti in the alloy matrix to optimize the morphology of the precipitates and further enhance the creep resistance.
Fig. 1. (a),(c) SEM-BEIs showing microstructures and (b),(d) corresponding EPMA elemental maps of the Ti-added alloy (Al–5Mg–3.5Zn–2Cu–2Ni-0.1Ti) aged at 300 °C for (a),(b) 10 and (c),(d) 1000 h.
Fig. 2. (a) Creep rate (strain rate)–time and (b) creep rate (strain rate)–strain curves of the Ti-added and Ti-free alloy specimens (pre-aged at 200 °C for 10 h) tested at 200 °C under 105 MPa.
Authors
The first and corresponding author of this work is Dr. Ruo-Qi Li from Nagoya University, Japan. Prof. Naoki Takata from Nagoya University is the co-corresponding author of this work.
Acknowledgement
The authors acknowledged the support of the JSPS (Japan) KAKENHI and the Light Metal Educational Foundation, Inc (Japan).
R. Li, M. Kondo, T. Suzuki, A. Suzuki, N. Takata, Controlling the addition of solute Ti in Al-Mg-Zn-Cu-Ni alloy for enhanced high-temperature creep properties, Materials Science and Engineering: A 889 (2024) 145859. DOI: https://doi.org/10.1016/j.msea.2023.145859
Editor: Dr. Jun-Jing He
