Strengthening and toughening behaviors of the Mg–9Al alloy containing oxygen atoms

Seung Won Kang, Dong Hyun Bae

Research output: Chapter in Book/Report/Conference proceedingConference contribution


New Mg–O–9Al alloy has been developed by the dispersion of oxygen atoms in the Mg–9Al alloy in which oxygen atoms are supplied from the decomposition of TiO2nanoparticles in the Mg–9Al alloy melt. The dissolved oxygen atoms expand the lattice structures of both α-Mg and β-phase, inducing the reduced mismatch distance between α-Mg and β-phase. Therefore, yield stress of the Mg–O–9Al alloy is 143 MPa, much higher than 110 MPa in the Mg–9Al alloy. Fracture toughness values of 10.39 MPa m1/2and 12.86 MPa m1/2for both the Mg–9Al and Mg–O–9Al alloys are also respectively obtained. The crack propagates along the weak interface of β-phase in the Mg–9Al alloy. On the other hand, the β-phase disturbs the crack propagation route in the Mg–O–9Al alloy, showing many broken β-phases. Therefore, the improved interfacial feature with an addition of dissolved oxygen atoms in the Mg–O–9Al alloy results in much enhanced mechanical properties.

Original languageEnglish
Title of host publicationMagnesium Technology 2018
EditorsKiran N. Solanki, Vineet Joshi, Neale R. Neelameggham, Dmytro Orlov
PublisherSpringer International Publishing
Number of pages6
ISBN (Print)9783319723310
Publication statusPublished - 2018
EventInternational Symposium on Magnesium Technology, 2018 - Phoenix, United States
Duration: 2018 Mar 112018 Mar 15

Publication series

NameMinerals, Metals and Materials Series
VolumePart F7
ISSN (Print)2367-1181
ISSN (Electronic)2367-1696


ConferenceInternational Symposium on Magnesium Technology, 2018
Country/TerritoryUnited States

Bibliographical note

Funding Information:
Acknowledgements The authors would like to take this opportunity to thank the National Research Foundation of Korea (NRF) (No. 2017R 1A2B2007062).

Publisher Copyright:
© The Minerals, Metals & Materials Society 2018.

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy Engineering and Power Technology
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry


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