High/Medium Entropy Alloys


High Entropy Alloys (HEAs) and Medium Entropy Alloys (MEAs) are made of 5 or more elements and 2-4 elements with an equal atomic percentage, respectively. They have become popular among metallurgists and material scientists in recent years due to their excellent strength, ductility, oxidation resistance, and thermal stability. Additionally, their mechanical properties improve at lower temperatures. For example, the CoCrFeMnNi HEA has been found to exhibit an Ultimate Tensile Strength (UTS) and ductility of 600 ± 40 MPa and 47% at room temperature, respectively. Furthermore, the UTS and ductility increase to 1060 ± 70 MPa and ~60% at cryogenic temperatures. These properties make them potential candidates for a wide range of industrial and technological applications such as aerospace, automotive, biomedical, and energy storage.

Some of my publications on MEA

Plasticity induced by nanoindentation in CrCoNi medium-entropy alloy studied by accurate electron channeling contrast imaging revealing dislocation-low angle grain boundary interactions.
F. Habiyaremye, A. Guitton, F. Schäfer, F. Scholz, M. Schneider, J. Frenzel, G. Laplanche, N. Maloufi
DOI: 10.1016/j.msea.2021.141364