Element-resolved local lattice distortion in complex concentrated alloys: An observable signature of electronic effects

Oh HS, Odbadrakh K, Ikeda Y, Mu S, Körmann F, Sun CJ, Ahn HS, Yoon KN, Ma D, Tasan CC, Egami T, Park ES (2021)

Publication Type: Journal article

Publication year: 2021

Journal

Acta Materialia Elsevier

Book Volume: 216

Article Number: 117135

DOI: 10.1016/j.actamat.2021.117135

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.

Authors with CRIS profile

Duancheng Ma Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Additional Organisation(s)

Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Involved external institutions

University of Tennessee (UTK) US United States (USA) (US) Max-Planck-Institut für Eisenforschung GmbH (MPIE) / Max Planck Institute for Iron Research DE Germany (DE) Seoul National University (SNU) / 서울대학교 KR Korea, Republic of (KR) Massachusetts Institute of Technology (MIT) US United States (USA) (US) The Advanced Photon Source US United States (USA) (US) Oak Ridge National Laboratory US United States (USA) (US)

How to cite

APA:

Oh, H.S., Odbadrakh, K., Ikeda, Y., Mu, S., Körmann, F., Sun, C.J.,... Park, E.S. (2021). Element-resolved local lattice distortion in complex concentrated alloys: An observable signature of electronic effects. Acta Materialia, 216. https://dx.doi.org/10.1016/j.actamat.2021.117135

MLA:

Oh, Hyun Seok, et al. "Element-resolved local lattice distortion in complex concentrated alloys: An observable signature of electronic effects." Acta Materialia 216 (2021).

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