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- W4280498788 abstract "High Entropy Alloys (HEAs) are a new broad class of near-random solid solution alloys that can possess some impressive mechanical and physical properties including high stability against grain growth (i.e. low grain boundary (GB) mobility). Here, it is shown that an initially flat GB in an HEA can become spontaneously rough, driven by natural local compositional fluctuations. Roughening lowers the total GB energy and thus can inhibit migration. A parameter-free theoretical framework is developed to demonstrate the energetics and size scales of the roughening in terms of solute/GB interaction energies and GB disconnection energies. Above a critical level of solute/GB interactions, a planar GB is predicted to roughen down to the scale of the GB periodic unit. A similar theory for 1D GBs (minimum periodic length in one direction) is also developed since such geometries are common in atomistic simulations. Specific predictions are made for the [100] symmetric tilt boundaries Σ17[100](530) and Σ5[100](310) in a model CoCuFeNi alloy and atomistic simulations demonstrate roughening consistent with the theory. Analysis of the stresses needed to drive migration shows how migration can be inhibited or enhanced, rationalizing variations in mobility of GBs in HEAs." @default.
- W4280498788 created "2022-05-22" @default.
- W4280498788 creator A5040782612 @default.
- W4280498788 creator A5073342612 @default.
- W4280498788 date "2022-08-01" @default.
- W4280498788 modified "2023-10-14" @default.
- W4280498788 title "Theory of spontaneous grain boundary roughening in high entropy alloys" @default.
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- W4280498788 doi "https://doi.org/10.1016/j.actamat.2022.118011" @default.
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