| Abstract Scope |
Developing lightweight yet strong Al-based alloys has attracted significant interest due to the increasing demand for energy-efficient structural materials. However, this endeavor is often hindered by the limited solubility of other lighter components in Al. In this talk, we propose converting multiple brittle phases into a ductile solid solution in Al-based complex concentrated alloys (CCA) through the application of high pressure and temperature. We successfully developed a face-centered cubic single-phase Al-based CCA with a low density of 2.40 g/cm³ and an ultra-high specific yield strength of 344×10³ N·m/kg. The formation of the single-phase CCA can be attributed to the decreased differences in atomic size and electronegativity under high pressure, as well as the synergistic high entropy effect induced by high temperature and pressure. The increase in strength primarily originates from high solid solution strengthening and nanoscale chemical fluctuations[1].
Reference:
[1] Mingliang Han et al., Nat. Commun., 15, 7102 (2024) |