Multi-functional magnesium alloys containing interstitial oxygen atoms

H. Kang, H. J. Choi, S. W. Kang, S. E. Shin, G. S. Choi, DongHyun Bae

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

A new class of magnesium alloys has been developed by dissolving large amounts of oxygen atoms into a magnesium lattice (Mg-O alloys). The oxygen atoms are supplied by decomposing titanium dioxide nanoparticles in a magnesium melt at 720 °C; the titanium is then completely separated out from the magnesium melt after solidification. The dissolved oxygen atoms are located at the octahedral sites of magnesium, which expand the magnesium lattice. These alloys possess ionic and metallic bonding characteristics, providing outstanding mechanical and functional properties. A Mg-O-Al casting alloy made in this fashion shows superior mechanical performance, chemical resistance to corrosion, and thermal conductivity. Furthermore, a similar Mg-O-Zn wrought alloy shows high elongation to failure (>50%) at room temperature, because the alloy plastically deforms with only multiple slips in the sub-micrometer grains (<300 nm) surrounding the larger grains (∼15 1/4m). The metal/non-metal interstitial alloys are expected to open a new paradigm in commercial alloy design.

Original languageEnglish
Article number23184
JournalScientific reports
Volume6
DOIs
Publication statusPublished - 2016 Mar 15

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magnesium alloys
oxygen atoms
interstitials
magnesium
wrought alloys
titanium oxides
solidification
elongation
micrometers
corrosion
dissolving
slip
thermal conductivity
titanium
mechanical properties
nanoparticles
room temperature
metals

All Science Journal Classification (ASJC) codes

  • General

Cite this

Kang, H. ; Choi, H. J. ; Kang, S. W. ; Shin, S. E. ; Choi, G. S. ; Bae, DongHyun. / Multi-functional magnesium alloys containing interstitial oxygen atoms. In: Scientific reports. 2016 ; Vol. 6.
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abstract = "A new class of magnesium alloys has been developed by dissolving large amounts of oxygen atoms into a magnesium lattice (Mg-O alloys). The oxygen atoms are supplied by decomposing titanium dioxide nanoparticles in a magnesium melt at 720 °C; the titanium is then completely separated out from the magnesium melt after solidification. The dissolved oxygen atoms are located at the octahedral sites of magnesium, which expand the magnesium lattice. These alloys possess ionic and metallic bonding characteristics, providing outstanding mechanical and functional properties. A Mg-O-Al casting alloy made in this fashion shows superior mechanical performance, chemical resistance to corrosion, and thermal conductivity. Furthermore, a similar Mg-O-Zn wrought alloy shows high elongation to failure (>50{\%}) at room temperature, because the alloy plastically deforms with only multiple slips in the sub-micrometer grains (<300 nm) surrounding the larger grains (∼15 1/4m). The metal/non-metal interstitial alloys are expected to open a new paradigm in commercial alloy design.",
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Multi-functional magnesium alloys containing interstitial oxygen atoms. / Kang, H.; Choi, H. J.; Kang, S. W.; Shin, S. E.; Choi, G. S.; Bae, DongHyun.

In: Scientific reports, Vol. 6, 23184, 15.03.2016.

Research output: Contribution to journalArticle

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T1 - Multi-functional magnesium alloys containing interstitial oxygen atoms

AU - Kang, H.

AU - Choi, H. J.

AU - Kang, S. W.

AU - Shin, S. E.

AU - Choi, G. S.

AU - Bae, DongHyun

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Y1 - 2016/3/15

N2 - A new class of magnesium alloys has been developed by dissolving large amounts of oxygen atoms into a magnesium lattice (Mg-O alloys). The oxygen atoms are supplied by decomposing titanium dioxide nanoparticles in a magnesium melt at 720 °C; the titanium is then completely separated out from the magnesium melt after solidification. The dissolved oxygen atoms are located at the octahedral sites of magnesium, which expand the magnesium lattice. These alloys possess ionic and metallic bonding characteristics, providing outstanding mechanical and functional properties. A Mg-O-Al casting alloy made in this fashion shows superior mechanical performance, chemical resistance to corrosion, and thermal conductivity. Furthermore, a similar Mg-O-Zn wrought alloy shows high elongation to failure (>50%) at room temperature, because the alloy plastically deforms with only multiple slips in the sub-micrometer grains (<300 nm) surrounding the larger grains (∼15 1/4m). The metal/non-metal interstitial alloys are expected to open a new paradigm in commercial alloy design.

AB - A new class of magnesium alloys has been developed by dissolving large amounts of oxygen atoms into a magnesium lattice (Mg-O alloys). The oxygen atoms are supplied by decomposing titanium dioxide nanoparticles in a magnesium melt at 720 °C; the titanium is then completely separated out from the magnesium melt after solidification. The dissolved oxygen atoms are located at the octahedral sites of magnesium, which expand the magnesium lattice. These alloys possess ionic and metallic bonding characteristics, providing outstanding mechanical and functional properties. A Mg-O-Al casting alloy made in this fashion shows superior mechanical performance, chemical resistance to corrosion, and thermal conductivity. Furthermore, a similar Mg-O-Zn wrought alloy shows high elongation to failure (>50%) at room temperature, because the alloy plastically deforms with only multiple slips in the sub-micrometer grains (<300 nm) surrounding the larger grains (∼15 1/4m). The metal/non-metal interstitial alloys are expected to open a new paradigm in commercial alloy design.

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