In-Situ Atomic-Scale Imaging on Oxidation of Magnesium

34 Pages Posted: 6 Nov 2018

See all articles by Qiuming Peng

Qiuming Peng

Yanshan University - State Key Laboratory of Metastable Materials Science and Technology

Jianxin Guo

Hebei University - Hebei Provincial Key Lab of Optoelectronic Information Materials

Yong Sun

Yanshan University - State Key Laboratory of Metastable Materials Science and Technology

Carlos Fernandez

Rober Gordon University - School of Pharmacy and Life Sciences

Jianyu Huang

Yanshan University - State Key Laboratory of Metastable Materials Science and Technology

Date Written: November 2, 2018

Abstract

Understanding oxidation process of Mg has great implications to improve mechanical/corrosion properties of Mg alloys. The oxide growth process of a single crystal Mg has been investigated by in-situ atomic-scale aberration-corrected environmental transmission electron microscopy. The oxidation process of Mg mainly proceeds through two different pathways: the outward expansion growth of MgO and the inward migration growth of MgO/Mg interface. The inward migration growth rate of MgO/Mg interface is about seven times than that of the outward expansion growth of MgO along the same orientation plane. Both growth rates are anisotropic, relative to orientation planes. The (011 ̅0)Mg||(020)MgO interface exhibits about twice rate than the (0002)Mg||(200)MgO interface. The inward migration growth is composed of three steps: the arriving of oxygen atoms to MgO/Mg interface, the oxygen adsorption in MgO/Mg interface and the oxygen diffusion in the core Mg. Three inward oxidation steps are elucidated in terms of high revolution transmission electron microscopy observations and theoretical calculations. The results demonstrate that the origin of inward anisotropic oxidation is mainly related to different oxygen diffusion barriers along altered crystallographic planes.

Keywords: Magnesium, Oxidation, In-situ, Atomic simulations, DFT calculations

Suggested Citation

Peng, Qiuming and Guo, Jianxin and Sun, Yong and Fernandez, Carlos and Huang, Jianyu, In-Situ Atomic-Scale Imaging on Oxidation of Magnesium (November 2, 2018). Available at SSRN: https://ssrn.com/abstract=3277524 or http://dx.doi.org/10.2139/ssrn.3277524

Qiuming Peng (Contact Author)

Yanshan University - State Key Laboratory of Metastable Materials Science and Technology ( email )

Qinhuangdao, 066004
China

Jianxin Guo

Hebei University - Hebei Provincial Key Lab of Optoelectronic Information Materials

Baoding, 071002
China

Yong Sun

Yanshan University - State Key Laboratory of Metastable Materials Science and Technology

Qinhuangdao, 066004
China

Carlos Fernandez

Rober Gordon University - School of Pharmacy and Life Sciences

Aberdeen, AB107GJ
United Kingdom

Jianyu Huang

Yanshan University - State Key Laboratory of Metastable Materials Science and Technology

Qinhuangdao, 066004
China

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