Microstructure and corrosion behavior of rapidly solidified Mg-Zn-Y alloys

S. W. Nam; W. T. Kim; D. H. Kim; T. S. Kim

doi:10.1007/s12540-013-2010-5

Microstructure and corrosion behavior of rapidly solidified Mg-Zn-Y alloys

S. W. Nam, W. T. Kim, D. H. Kim, T. S. Kim

Department of Materials Science and Engineering

Research output: Contribution to journal › Article

14 Citations (Scopus)

Abstract

The effect of a minor change in alloy composition on the microstructure and corrosion properties of melt spun Mg_98.3-xZn_xY _1.7 ribbons with x=9-12 is studied by X-ray diffractometry, differential scanning calorimetry, transmission electron microscopy and a dynamic polarization test. The ribbon specimens with x=9-10 revealed an in-situ composite microstructure consisting of icosahedral quasicrystalline phase (I-phase) particles distributed in an α-Mg matrix. The ribbon specimens with x=11 and 12 contained a minor MgZn₂ phase together with an α-Mg phase and I-phase. With increasing Zn content, the corrosion potential increased because of a mixed potential effect, but the formation of a MgZn₂ phase deteriorated the corrosion property through preferential attack, causing an irregular boundary between the corrosion product and the substrate. These results indicate that it is important to control alloy chemistry not to form the MgZn₂ phase in developing an I-phase strengthened Mg-Zn-Y alloy for structural applications.

Original language	English
Pages (from-to)	205-209
Number of pages	5
Journal	Metals and Materials International
Volume	19
Issue number	2
DOIs	https://doi.org/10.1007/s12540-013-2010-5
Publication status	Published - 2013 Mar 1

All Science Journal Classification (ASJC) codes

Condensed Matter Physics
Mechanics of Materials
Metals and Alloys
Materials Chemistry

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Nam, S. W., Kim, W. T., Kim, D. H., & Kim, T. S. (2013). Microstructure and corrosion behavior of rapidly solidified Mg-Zn-Y alloys. Metals and Materials International, 19(2), 205-209. https://doi.org/10.1007/s12540-013-2010-5

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abstract = "The effect of a minor change in alloy composition on the microstructure and corrosion properties of melt spun Mg98.3-xZnxY 1.7 ribbons with x=9-12 is studied by X-ray diffractometry, differential scanning calorimetry, transmission electron microscopy and a dynamic polarization test. The ribbon specimens with x=9-10 revealed an in-situ composite microstructure consisting of icosahedral quasicrystalline phase (I-phase) particles distributed in an α-Mg matrix. The ribbon specimens with x=11 and 12 contained a minor MgZn2 phase together with an α-Mg phase and I-phase. With increasing Zn content, the corrosion potential increased because of a mixed potential effect, but the formation of a MgZn2 phase deteriorated the corrosion property through preferential attack, causing an irregular boundary between the corrosion product and the substrate. These results indicate that it is important to control alloy chemistry not to form the MgZn2 phase in developing an I-phase strengthened Mg-Zn-Y alloy for structural applications.",

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