Expanded dataset of mechanical properties and observed phases of multi-principal element alloys

This data article presents a compilation of mechanical properties of 630 multi-principal element alloys.Built upon recently published MPEA databases, this article includes updated records from previous reviews (with minor error corrections) along with new data from articles that were published since 2019.The extracted properties include composition, processing method, microstructure, density, hardness, yield strength, ultimate tensile strength, elongation, and Young’s modulus.Additionally, descriptors (e.g. grain size) not included in previous reviews were also extracted for articles that reported them.