A new study co-authored by Y. Wang, Jacob Jeffries, Dr. Enrique Martinez Saez, S. Mathaudhu, E. Marqui and Fadi Abdeljawad and published in the Journal of Materials Science explores how atoms arrange themselves at the tiny boundaries between crystals in advanced metal alloys. These boundaries—called grain boundaries—play a major role in determining a material’s strength, flexibility, and resistance to heat or corrosion.
The research focused on the CoCrFeMnNi alloy, often known as the Cantor alloy, which is part of an exciting class of materials called multi-principal element alloys (MPEAs). Unlike traditional metals that are based on one main element, MPEAs combine several elements in nearly equal amounts to achieve exceptional performance.
Using advanced computer simulations, the team found that chromium (Cr) and manganese (Mn) atoms tend to gather at grain boundaries, while iron (Fe), cobalt (Co), and nickel (Ni) move away from them. This segregation becomes less pronounced at higher temperatures. Interestingly, changing the angle or shape of the boundaries did not significantly affect this atomic behavior.
The study also revealed that the chemical “ordering” of atoms—how they prefer to pair up—differs at grain boundaries compared to the inside of the metal. These small atomic differences can have big impacts on how a material performs under stress or high heat.
By uncovering how atoms behave at these boundaries, the researchers are helping engineers design smarter, stronger alloys for extreme environments like aerospace, power generation, and advanced manufacturing.
Citation: Xu et al., “Atomic segregation and chemical short-range order in asymmetric tilt grain boundaries of CoCrFeMnNi multi-principal element alloy,” Journal of Materials Science (2025). Read the article here.
