Structural reorganisation governs atomic transport while preserving mobility hierarchy in a nanopolycrystalline Al₀.₈NbTiVNi₀.₂ lightweight refractory high-entropy alloy
Understanding atomic transport mechanisms in lightweight refractory high-entropy alloys (LW-RHEAs) is essential for predicting their long-term high-temperature stability and service performance. Although diffusion in high-entropy alloys has been widely investigated, the individual contributions of bulk and grain-boun...