Effect of Co addition on crystal structure and mechanical properties of Ti0.5CrFeNiAlCo high entropy alloy. Solid solution alloys of AlCoCrFeNiTix with excellent room-temperature mechanical properties. Microstructure characterization of AlxCoCrCuFeNi high-entropy alloy system with multi-principal elements. Multi-principal-element alloys with improved oxidation and wear resistance for thermal spray coating. A critical review of high entropy alloys and related concepts. Microstructural development in equiatomic multicomponent alloys. Nanostructured high-entropy alloys with multiple principal elements: novel alloy design concepts and outcomes. We also address the vast compositional space that remains to be explored and outline fruitful ways to identify regions within this space where high-entropy alloys with potentially interesting properties may be lurking. Model alloys whose behaviour has been carefully investigated are highlighted and their fundamental properties and underlying elementary mechanisms discussed. Here, we review recent progress in understanding the salient features of high-entropy alloys. Nevertheless, a few high-entropy alloys have already been shown to possess exceptional properties, exceeding those of conventional alloys, and other outstanding high-entropy alloys are likely to be discovered in the future. The multi-dimensional compositional space that can be tackled with this approach is practically limitless, and only tiny regions have been investigated so far. For the past decade and a half, however, a new alloying strategy that involves the combination of multiple principal elements in high concentrations to create new materials called high-entropy alloys has been in vogue. Typically, it involves the addition of relatively small amounts of secondary elements to a primary element. Alloying has long been used to confer desirable properties to materials.
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