Element-resolved local lattice distortion in complex concentrated alloys
An observable signature of electronic effects
Hyun Seok Oh (Massachusetts Institute of Technology, Seoul National University)
Khorgolkhuu Odbadrakh (Oak Ridge National Laboratory, University of Tennessee)
Yuji Ikeda (University of Stuttgart, Max-Planck-Institut für Eisenforschung)
Sai Mu (Oak Ridge National Laboratory)
Fritz Körmann (Max-Planck-Institut für Eisenforschung, TU Delft - Team Marcel Sluiter)
Cheng Jun Sun (Argonne National Laboratory)
Heh Sang Ahn (Seoul National University)
Kook Noh Yoon (Seoul National University)
Duancheng Ma (Friedrich-Alexander-Universität Erlangen-Nürnberg)
Cemal Cem Tasan (Massachusetts Institute of Technology)
Takeshi Egami (Argonne National Laboratory, The University of Tennessee Knoxville)
Eun Soo Park (Seoul National University)
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Abstract
Complex concentrated alloys (CCAs) are of growing interest due to their outstanding mechanical properties that exceed the property limits of conventional alloys. Whereas the superior properties are often attributed to severe lattice distortion, to date it is not clear what controls the lattice distortion and how it affects the mechanical properties of CCAs. In this work, we study the element-resolved local lattice distortion (ELLD) in CCAs of 3d transition-metal elements (3d CCAs) by the extended X-ray absorption fine structure experiment and the density-functional theory calculations. We show that ELLD is primarily dependent upon charge transfer among elements and affects the properties through atomic-level pressure and orbital transition. The ELLD provides a qualitative measure of the effective atomic size for explaining element-specific properties and macroscopic properties.
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