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Significance Complex concentrated alloys (CCAs) with multi elements in equiatomic ratios are exotic alloys but what governs their strength is currently not clearly understood. This work has proven the prime… Click to show full abstract
Significance Complex concentrated alloys (CCAs) with multi elements in equiatomic ratios are exotic alloys but what governs their strength is currently not clearly understood. This work has proven the prime origin of strength in CCAs as arising from the fluctuations (not the averaged value) of the shear-fault energy, which is an important feature of CCAs unrecognized beforehand. Through identification of the local hard atomic motifs far beyond the traditional concept of the globally averaged short-range ordering parameters, this work has unfolded the physical basis of strength in CCAs and provides important clues for designing high-strength CCAs by focusing on the alloy composition to produce large fault-energy fluctuations.
Journal Title: Proceedings of the National Academy of Sciences of the United States of America
Year Published: 2023
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