Tunable stacking fault energies by tailoring local chemical order in CrCoNi medium-entropy alloys.

ABSTRACT: High-entropy alloys (HEAs) are an intriguing new class of metallic materials due to their unique mechanical behavior. Achieving a detailed understanding of structure-property relationships in these materials has been challenged by the compositional disorder that underlies their unique mechanical behavior. Accordingly, in this work, we employ first-principles calculations to investigate the nature of local chemical order and establish its relationship to the intrinsic and extrinsic stacking fault energy (SFE) in CrCoNi medium-entropy solid-solution alloys, whose combination of strength, ductility, and toughness properties approaches the best on record. We find that the average intrinsic and extrinsic SFE are both highly tunable, with values ranging from -43 to 30 mJ⋅m-2 and from -28 to 66 m

SUBMITTER: Ding J 

PROVIDER: S-EPMC6130406 | biostudies-literature | 2018 Sep

REPOSITORIES: biostudies-literature