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Using High-Temperature Nanoindentation to Study Mechanical Properties of High-Entropy Alloys (HEA)

Using High-Temperature Nanoindentation to Study Mechanical Properties of High-Entropy Alloys (HEA)

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Scientists have recently become more interested in high-entropy alloys (HEA) because of their strength at high temperatures, when compared with conventional alloying systems. HEAs, composed of multiple principal elements, exhibit superior mechanical performance at elevated temperatures and excellent specific strength comparable to superalloys, e.g. Inconel 718 or structural ceramics, as a result of their high configurational (statistical) entropy and sluggish diffusion of constituent elements [1]. High-entropy effects promote more thermal stability in the system and maintain the strength at high service temperatures even up to 85% percent of their absolute melting temperatures [2]. However, underlying mechanisms which control elevated temperature properties are still unknown due to the compositional complexity of the system and their interactions with each other. The system and interactions become even more complicated when several phases are present which transform at higher temperatures.

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