Unravelling the Creep Behavior of Equiatomic CoCrFeMnNi High-Entropy Alloy Foam: A Molecular Dynamics Study

High-entropy alloys (HEAs) are a class of materials distinguished by their unique multi-element compositions, offering exceptional mechanical properties such as high strength and thermal stability. Recently, HEA foams have been fabricated, offering several additional advantages over traditional solid HEAs. These include reduced density, which enhances their suitability for lightweight structural applications, and enhanced energy absorption. In this study, molecular dynamics simulations were used to investigate the creep deformation mechanisms of equiatomic CoCrFeMnNi HEA foam under varying conditions, including temperatures of 1300 K, 1600 K, and 1900 K, pressures ranging from 5 to 8 GPa, and porosities from 0–30%. The results demonstrated that an increase in temperature led to higher strain values, particularly in models with porosities below 15%. Structural analysis reveals a reduction in the face-centered cubic (FCC) phase with increasing temperature, accompanied by an increase in amorphous structures and Shockley partial dislocation activity. Dislocation networks became more complex with increasing porosity, with the high dislocation densities observed at high porosities and temperature. Further mean square deviation (MSD) and radial distribution function (RDF) techniques helped elucidate the atomic-scale changes in the HEA structure, showing the significant interplay between temperature, pressure, and porosity on material stability. This study provides valuable insights into the creep behavior and dislocation dynamics of HEA foams, contributing to the optimization of these materials for high-performance applications in extreme environments.