Unusual dislocation behavior in high-entropy alloys
By Evan Ma. Scripta Materialia, 2020
238 citations recorded by the source corpus.
Abstract This Viewpoint article articulates ten unusual features associated with dislocations and their slip processes in high-entropy alloys (HEAs). Attention will be directed towards the composition undulation almost inevitable in these highly concentrated solutions, even when the alloy is a single-phase and nominally random solution. This inhomogeneity is often exacerbated by lattice distortion and local chemical order arising from the interaction among multiple principal elements. As a consequence, dislocation motion faces a rugged atomic and energy landscape, presenting new twists in defect energetics and properties, as well as cocktail strengthening as a new form of solid solution hardening beyond the conventional mechanism. Our systematic account from this standpoint may help answer the continual query in the community as to what is special about these HEAs that makes them different from traditional solid solutions.
Subfields: Aerospace Engineering, Mechanical Engineering
View Paper: https://www.semanticscholar.org/paper/6bcbd13d8ac25004ed2008e7dbd97a8abb4ec2ec
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In Aerospace Engineering
In Mechanical Engineering
Citations in the corpus
- Novel atomic-scale mechanism of incipient plasticity in a chemically complex CrCoNi medium-entropy alloy associated with inhomogeneity in local chemical environment (2020, background): “The high-entropy alloys (HEAs) or complex concentrated alloys (CCAs), and their derivatives (e.g., medium- entropy alloys, MEAs), in which multiple principal elements in equal or near equal molar ratio are occupied randomly on the topologically ordered crystallographic lattices with a high chemicall”