Abstract
Metallic alloys are critical to essentially all advanced technologies and engineered systems. The well-documented impact of corrosion (and oxidation) of alloys, remains a significant industrial and economic challenge, year on year. Recent activity in the field of metallurgy has revealed a class of metallic alloys, termed multi principal element alloys (MPEAs) that present unique physical properties. Such MPEAs have in many instances also demonstrated a high resistance to corrosion – which may permit the broader use of MPEAs as corrosion resistant alloys (CRAs) in harsh environments. Herein, the progress in MPEA research to date, along with prospects and challenges, are concisely reviewed—with potential future lines of research elaborated.
Highlights
Emerging technologies often place critical demands upon the portfolio of existing materials, namely metallic alloys, such that material development remains necessary
The performance of a class of metallic materials known as high entropy alloys (HEAs) has very rapidly captured the attention of researchers, the world over
Empirical rules for the design of HEAs that adopted the pursuit of a high entropy of mixing were developed[7,8] and examples of HEAs include CoCrFeNiMn9, TaNbHfZrTi10, and Al20Li20Mg10Sc20Ti3011
Summary
Emerging technologies often place critical demands upon the portfolio of existing materials, namely metallic alloys, such that material development remains necessary. What was perhaps one of the most remarkable empirical findings in the recent history of metallurgy, is the physical properties of HEAs, as reported in the detailed review by Zhang et al.[12]; revealing that HEAs have very high strength and excellent thermal stability, placing them in their own unique (and favourable) window of so-called ‘propertyspace’[13]. This new property space has to date focused mainly on mechanical properties, with corrosion and oxidation resistance relatively less explored.
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