Elucidating the role of a unique step-like interfacial structure of η 4 precipitates in Al-Zn-Mg alloy

Author:

Kim Hwangsun1ORCID,Choi Howook1ORCID,Oh Juhyun1ORCID,Lee Sangmin1ORCID,Kwon Ho1ORCID,Park Eun Soo1ORCID,Lee Sungwoo1ORCID,Lee Gun-Do1ORCID,Kim Miyoung1ORCID,Han Heung Nam1ORCID

Affiliation:

1. Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea.

Abstract

Al-Zn-Mg alloys are widely used in the transportation industry owing to their high strength-to-weight ratio. In these alloys, the main strengthening mechanism is precipitation hardening that occurs because of the formation of nano-sized precipitates. Herein, an interfacial structure of η 4 precipitates, one of the main precipitates in these alloys, is revealed using aberration-corrected scanning transmission electron microscopy and first-principles calculations. These precipitates exhibit a pseudo-periodic steps and bridges. The results of this study demonstrate that the peculiar interface structure of η 4 /Al relieves the strain energy of η 4 precipitates thus stabilizing them. The atomistic role of this interfacial structure in the nucleation and growth of the precipitates is elucidated. This study paves the way for tailoring the mechanical properties of alloys by controlling their precipitation kinetics.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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