Element-resolved local lattice distortion in complex concentrated alloys

An observable signature of electronic effects

Journal article (2021)

Authors

Hyun Seok Oh Massachusetts Institute of Technology, Seoul National University
Khorgolkhuu Odbadrakh University of Tennessee, Oak Ridge National Laboratory
Takeshi Egami Argonne National Laboratory, The University of Tennessee Knoxville
Eun Soo Park Seoul National University
Yuji Ikeda University of Stuttgart, Max-Planck-Institut für Eisenforschung
Sai Mu Oak Ridge National Laboratory
F.H.W. Körmann Max-Planck-Institut für Eisenforschung, Team Marcel Sluiter - Mechanical, Maritime and Materials Engineering
Chengjun 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
Research Group
Team Marcel Sluiter (Mechanical, Maritime and Materials Engineering) (TU Delft)
Copyright: © 2021 Hyun Seok Oh, Khorgolkhuu Odbadrakh, Yuji Ikeda, Sai Mu, F.H.W. Körmann, Cheng Jun Sun, Heh Sang Ahn, Kook Noh Yoon, Duancheng Ma, Cemal Cem Tasan, Takeshi Egami, Eun Soo Park
DOI: https://doi.org/10.1016/j.actamat.2021.117135
More Info
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Published Date

2021

Language

English

Faculty

Mechanical, Maritime and Materials Engineering

Department

Materials Science and Engineering

Research Group

Team Marcel Sluiter

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.