Abstract
There has been tremendous interest in recent years in a new class of multi-component metallic alloys that are referred to as high entropy alloys, or more generally, as complex concentrated alloys. These multi-principal element alloys represent a new paradigm in structural material design, where numerous desirable attributes are achieved simultaneously from multiple elements in equimolar (or near equimolar) proportions. While there are several review articles on alloy development, microstructure, mechanical behavior, and other bulk properties of these alloys, then there is a pressing need for an overview that is focused on their surface properties and surface degradation mechanisms. In this paper, we present a comprehensive view on corrosion, erosion and wear behavior of complex concentrated alloys. The effect of alloying elements, microstructure, and processing methods on the surface degradation behavior are analyzed and discussed in detail. We identify critical knowledge gaps in individual reports and highlight the underlying mechanisms and synergy between the different degradation routes.
Highlights
Development of materials having superior surface degradation resistance has been a major thrust area of research in modern metallurgy
Corrosion behavior of complex concentrated alloys has been evaluated by immersion test, open circuit potential measurement with time, potentiodynamic polarization, and anodic polarization
TheAlloys observed corrosion behavior in these alloys may be broadly classified based on their composition the surface passivation layers, Majority of the complex concentrated alloys studiedand so far forresulting their corrosion behavior are based on the CoCrFeNi equimolar system
Summary
Development of materials having superior surface degradation resistance has been a major thrust area of research in modern metallurgy. There is high demand for developing materials with improved wear resistance for enhancing the energy efficiency of turbines, windmill rotors, and automobiles These call for structural components that can withstand high torque and resist metallurgical changes that are caused by frictional heat and high pressure. Multi-principal element alloys represent a new paradigm in structural material design, where numerous desirable attributes are achieved simultaneously from multiple elements in equimolar (or near equimolar) proportions [1,2,3,4,5,6,7] These alloys are typically referred to as high entropy alloys (HEAs) or more generally as complex concentrated alloys (CCAs). The effect of alloying elements, microstructure, and processing methods on the different surface degradation routes are analyzed and discussed in detail
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