review · International Journal of Lightweight Materials and Manufacture
High Entropy Alloys represent an emerging class of metallic materials recognised for advanced mechanical strength, wear resistance, thermal stability, and corrosion performance. By combining multiple principal elements, these materials achieve distinctive microstructures that frequently outperform conventional alloys. Lightweight High Entropy Alloys form a specific category defined by densities below six grams per cubic centimetre. This combination of reduced weight and enhanced performance makes them attractive candidates for specialised transport and structural uses. Recent developmental efforts concentrate on effective fabrication methods, protective coatings, and surface modifications. Examining current knowledge across fabrication processes alongside mechanical, wear, and corrosion behaviours helps establish future directions for alloy design. These insights assist in establishing design principles to meet the expanding requirements of modern industry.
Modern transport and industrial sectors increasingly demand structural materials that minimise weight without compromising strength or durability. Lightweight High Entropy Alloys offer superior resistance to wear, heat, and corrosion at densities lower than conventional alternatives. Understanding their fabrication and material properties provides engineers and manufacturers with options to build lighter, more efficient components for harsh operating environments.
The primary applications are in the aerospace and automotive sectors, targeting manufacturers of transport systems requiring lightweight, durable parts. Because the findings focus on review-level assessments of fabrication processes, surface treatments, and future design directions, the technology is at an early research stage and requires further processing refinement before reaching commercial adoption.
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Current advancements in technology enables the enhancement and refinement of alloys to address the demands of expanding industrial applications. High Entropy Alloys (HEAs) are a developing class of alloys displaying unique and advanced mechanical, tribological, thermal stability, and corrosion properties. HEAs have unpredictable structures and compositions displaying enhanced performance and characteristics. Unique microstructures can be achieved through multi-principal elements and HEAs usually outperform conventionally made alloys. Lightweight HEAs (LWHEAs) are a category of HEAs with alloy density less than 6 g/cm3 and are potentially applicable in the automobile and aerospace industries. The superior characteristics make LWHEAs an extremely interesting space for research. Recent research has focused on effective manufacturing methods for processing alloys, coatings, and surface modifications. The current work discusses a comprehensive review of fabrication processes, mechanical, tribological, and corrosion behavior of LWHEAs. The review also highlights the future scope of research and directions for designing LWHEAs. The results of the article provide crucial information to researchers and pioneers exploring LWHEAs.
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DOI: 10.1016/j.ijlmm.2024.06.001
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