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Nano Research 2016, 9(9): 2796-2802 https://doi.org/10.1007/s12274-016-1168-9
Research Article | Issue | Published: 28 July 2016

In situ observation of sublimation-enhanced magnesium oxidation at elevated temperature

Show Author's Information Zijiao Zhang1,  Xiaoqian Fu1,  Minmin Mao1,  Qian Yu1( ),  Scott X. Mao1,2( ),  Jixue Li1,  Ze Zhang1
Center of Electron Microscopy and State Key Laboratory of Silicon MaterialsDepartment of Materials Science & EngineeringZhejiang UniversityHangzhou310027China
Department of Mechanical Engineering & Materials ScienceUniversity of PittsburghPittsburghPA15261USA
Keywords:
nanoparticle, oxidation, magnesium, sublimation
Cite this article:
Zhang Z, Fu X, Mao M, et al. In situ observation of sublimation-enhanced magnesium oxidation at elevated temperature. Nano Research, 2016, 9(9): 2796-2802. https://doi.org/10.1007/s12274-016-1168-9
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Abstract Full text Electronic supplementary material About this article

Oxidation plays a tremendous role in the long-term performance of metals. As an important lightweight metal for industrial applications, magnesium suffers from its high reactivity with oxygen and increased evaporation at high temperatures. To understand the oxidation mechanism of magnesium at elevated temperatures, in situ environmental transmission electron microscopy (E-TEM) was performed on magnesium nanoparticles. At a relatively low temperature, the growth of a MgO lamellae via the outward diffusion of bulk magnesium atoms dominated the oxidation process. In contrast, a sublimation-enhanced oxidation via gas phase reaction occurred at 200 ℃, leading to the growth of MgO dendrites over the particle that finally leads to the degradation of the magnesium structure. This study provides a direct observation and model of the oxidation mechanism of a direct gas–gas reaction that improves our understanding of the oxidation mechanism at elevated temperatures.


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Electronic supplementary material
About this article

In situ observation of sublimation-enhanced magnesium oxidation at elevated temperature

Show Author's information Zijiao Zhang1, Xiaoqian Fu1, Minmin Mao1, Qian Yu1( ), Scott X. Mao1,2( ), Jixue Li1, Ze Zhang1
Center of Electron Microscopy and State Key Laboratory of Silicon MaterialsDepartment of Materials Science & EngineeringZhejiang UniversityHangzhou310027China
Department of Mechanical Engineering & Materials ScienceUniversity of PittsburghPittsburghPA15261USA

Abstract

Oxidation plays a tremendous role in the long-term performance of metals. As an important lightweight metal for industrial applications, magnesium suffers from its high reactivity with oxygen and increased evaporation at high temperatures. To understand the oxidation mechanism of magnesium at elevated temperatures, in situ environmental transmission electron microscopy (E-TEM) was performed on magnesium nanoparticles. At a relatively low temperature, the growth of a MgO lamellae via the outward diffusion of bulk magnesium atoms dominated the oxidation process. In contrast, a sublimation-enhanced oxidation via gas phase reaction occurred at 200 ℃, leading to the growth of MgO dendrites over the particle that finally leads to the degradation of the magnesium structure. This study provides a direct observation and model of the oxidation mechanism of a direct gas–gas reaction that improves our understanding of the oxidation mechanism at elevated temperatures.

Keywords: nanoparticle, oxidation, magnesium, sublimation

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Publication history
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Acknowledgements

Publication history

Received: 27 March 2016
Revised: 22 May 2016
Accepted: 02 June 2016
Published: 28 July 2016
Issue date: September 2016

Copyright

© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2016

Acknowledgements

Acknowledgements

This work was supported in China by grants from the Chinese 1000 Youth Talent Program and the National Basic Research Program of China (No. 2015CB65930).

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