High-entropy alloys mix several elements in large amounts, creating materials that can be strong and perform well at high temperatures. Their atoms do not sit perfectly in place: they shift slightly, a pattern called local lattice distortion. Researchers have often explained this distortion mainly through differences in the sizes of the atoms.
A new study suggests that bond strength matters just as much. Using computer calculations to examine 415 body-centered cubic alloy compositions, Dr. D. P. Aidhy and his research team found that alloys with stronger atomic bonds tended to have less distortion. As valence electron concentration increased, bonds became stiffer, and atoms were held closer to their ideal positions.
MSE researchers also found that atomic-size mismatch still plays a role. In fact, distortion reflects the combined effects of size differences and bonding strength. Some alloys with weaker bonds showed such a wide range of bond lengths that the usual spacing between neighboring atoms became less distinct.
These findings could help researchers design refractory high-entropy alloys for demanding conditions. By adjusting both the elements’ sizes and the alloy’s electronic structure, scientists may be able to better predict and control how its atoms arrange themselves. The results come from density functional theory calculations, so experiments will be needed to test how well these patterns hold in real materials.
Citation: Pant, D.; Varshney, S.; Aidhy, D. S. Bond strength-A key cause of local lattice distortion in BCC high entropy alloys. MATERIALIA 2026, 49.
