This book offers an in-depth exploration of the mechanical properties and processing methods of high entropy alloys (HEAs), covering topics such as microstructural evolution, deformation mechanisms, alloy composition, processing techniques, and various applications. It provides an introduction to HEAs, outlining the differences between them and more traditional alloys, before diving into more complex subjects such as their stability and metastability, their crystal structures, FCC- and BCC-based HEAs, as well as thermomechanical treatments and their mechanical properties. Deformation processing techniques, solid state processing methods, and additive manufacturing of HEAs are each discussed as well, as are modeling and simulation approaches. A broad range of applications and limitations for these cutting-edge materials are also covered.• Covers classification, properties, and behavior of multielement/high entropy alloys under deformation processing techniques• Outlines modeling and simulation techniques for predicting material behavior and optimizing processing parameters• Includes case studies and cutting-edge examples of high entropy alloys in various applications