Thermal Stability of Medium- and High-Entropy Alloys of 3d-Transition Metals

A family of high-entropy alloys (HEA) composed 3d-transitional metals is attracting great interest due to the mechanical, magnetic, and electrical properties that are valuable in development advanced structural functional materials. In this work, we studied X-CoCrFeNi HEAs, where X = Al, Ti, or Cu, produced by mechanical alloying means high-energy ball milling. Powder mixture elemental metal powders transforms a homogeneous alloy (super-saturated solid solution) intense diffusion which takes place during friction shear deformation particles alloying. The thermal stability HEA phases was experimentally range 873-1273 K using high-temperature X-ray diffraction compared with results thermodynamic calculations (Calphad).