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Title: Rapid Diffusion and Nanosegregation of Hydrogen in Magnesium Alloys from Exposure to Water

Abstract

Hydrogen gas is formed when Mg corrodes in water; however, the manner and extent to which the hydrogen may also enter the Mg metal is poorly understood. Such knowledge is critical as stress corrosion cracking (SCC)/embrittlement phenomena limit many otherwise promising structural and functional uses of Mg. Here, we report via D 2O/D isotopic tracer and H 2O exposures with characterization by secondary ion mass spectrometry, inelastic neutron scattering vibrational spectrometry, electron microscopy, and atom probe tomography techniques direct evidence that hydrogen rapidly penetrated tens of micrometers into Mg metal after only 4 h of exposure to water at room temperature. Further, technologically important microalloying additions of <1 wt % Zr and Nd used to improve the manufacturability and mechanical properties of Mg significantly increased the extent of hydrogen ingress, whereas Al additions in the 2–3 wt % range did not. Segregation of hydrogen species was observed at regions of high Mg/Zr/Nd nanoprecipitate density and at Mg(Zr) metastable solid solution microstructural features. We also report evidence that this ingressed hydrogen was unexpectedly present in the alloy as nanoconfined, molecular H 2. These new insights provide a basis for strategies to design Mg alloys to resist SCC in aqueous environments asmore » well as potentially impact functional uses such as hydrogen storage where increased hydrogen uptake is desired.« less

Authors:
ORCiD logo [1]; ORCiD logo [1];  [2];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]; ORCiD logo [1];  [1];  [1];  [3]
  1. Oak Ridge National Laboratory (ORNL), Oak Ridge, Tennessee 37831, United States
  2. Department of Geological Sciences, University of Manitoba (UM), Winnipeg, MB R3T 2N2, Canada
  3. Magnesium Elektron North America (MENA), Madison, Illinois 62060, United States
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
OSTI Identifier:
1400005
Alternate Identifier(s):
OSTI ID: 1408592
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Published Article
Journal Name:
ACS Applied Materials and Interfaces
Additional Journal Information:
Journal Name: ACS Applied Materials and Interfaces Journal Volume: 9 Journal Issue: 43; Journal ID: ISSN 1944-8244
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
08 HYDROGEN; 36 MATERIALS SCIENCE; corrosion; hydrogen; hydrogen storage; magnesium; stress corrosion cracking (SCC)

Citation Formats

Brady, Michael P., Ievlev, Anton V., Fayek, Mostafa, Leonard, Donovan N., Frith, Matthew G., Meyer, III, Harry M., Ramirez-Cuesta, Anibal J., Daemen, Luke L., Cheng, Yongqiang, Guo, Wei, Poplawsky, Jonathan D., Ovchinnikova, Olga S., Thomson, Jeffrey, Anovitz, Lawrence M., Rother, Gernot, Shin, Dongwon, Song, Guang-Ling, and Davis, Bruce. Rapid Diffusion and Nanosegregation of Hydrogen in Magnesium Alloys from Exposure to Water. United States: N. p., 2017. Web. doi:10.1021/acsami.7b10750.
Brady, Michael P., Ievlev, Anton V., Fayek, Mostafa, Leonard, Donovan N., Frith, Matthew G., Meyer, III, Harry M., Ramirez-Cuesta, Anibal J., Daemen, Luke L., Cheng, Yongqiang, Guo, Wei, Poplawsky, Jonathan D., Ovchinnikova, Olga S., Thomson, Jeffrey, Anovitz, Lawrence M., Rother, Gernot, Shin, Dongwon, Song, Guang-Ling, & Davis, Bruce. Rapid Diffusion and Nanosegregation of Hydrogen in Magnesium Alloys from Exposure to Water. United States. doi:10.1021/acsami.7b10750.
Brady, Michael P., Ievlev, Anton V., Fayek, Mostafa, Leonard, Donovan N., Frith, Matthew G., Meyer, III, Harry M., Ramirez-Cuesta, Anibal J., Daemen, Luke L., Cheng, Yongqiang, Guo, Wei, Poplawsky, Jonathan D., Ovchinnikova, Olga S., Thomson, Jeffrey, Anovitz, Lawrence M., Rother, Gernot, Shin, Dongwon, Song, Guang-Ling, and Davis, Bruce. Tue . "Rapid Diffusion and Nanosegregation of Hydrogen in Magnesium Alloys from Exposure to Water". United States. doi:10.1021/acsami.7b10750.
@article{osti_1400005,
title = {Rapid Diffusion and Nanosegregation of Hydrogen in Magnesium Alloys from Exposure to Water},
author = {Brady, Michael P. and Ievlev, Anton V. and Fayek, Mostafa and Leonard, Donovan N. and Frith, Matthew G. and Meyer, III, Harry M. and Ramirez-Cuesta, Anibal J. and Daemen, Luke L. and Cheng, Yongqiang and Guo, Wei and Poplawsky, Jonathan D. and Ovchinnikova, Olga S. and Thomson, Jeffrey and Anovitz, Lawrence M. and Rother, Gernot and Shin, Dongwon and Song, Guang-Ling and Davis, Bruce},
abstractNote = {Hydrogen gas is formed when Mg corrodes in water; however, the manner and extent to which the hydrogen may also enter the Mg metal is poorly understood. Such knowledge is critical as stress corrosion cracking (SCC)/embrittlement phenomena limit many otherwise promising structural and functional uses of Mg. Here, we report via D2O/D isotopic tracer and H2O exposures with characterization by secondary ion mass spectrometry, inelastic neutron scattering vibrational spectrometry, electron microscopy, and atom probe tomography techniques direct evidence that hydrogen rapidly penetrated tens of micrometers into Mg metal after only 4 h of exposure to water at room temperature. Further, technologically important microalloying additions of <1 wt % Zr and Nd used to improve the manufacturability and mechanical properties of Mg significantly increased the extent of hydrogen ingress, whereas Al additions in the 2–3 wt % range did not. Segregation of hydrogen species was observed at regions of high Mg/Zr/Nd nanoprecipitate density and at Mg(Zr) metastable solid solution microstructural features. We also report evidence that this ingressed hydrogen was unexpectedly present in the alloy as nanoconfined, molecular H2. These new insights provide a basis for strategies to design Mg alloys to resist SCC in aqueous environments as well as potentially impact functional uses such as hydrogen storage where increased hydrogen uptake is desired.},
doi = {10.1021/acsami.7b10750},
journal = {ACS Applied Materials and Interfaces},
number = 43,
volume = 9,
place = {United States},
year = {2017},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1021/acsami.7b10750

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Cited by: 2 works
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