Mechanical property and corrosion resistance of Mg-Zn-Y alloys containing icosahedral phase

Do Hyung Kim, Young Kyun Kim, Won Tae Kim, Do Hyang Kim

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Mechanical and property corrosion resistance of Mg-Zn-Y alloys with an atomic ratio of Zn/Y of 6.8 are investigated using optical microscopy, scanning electron microscopy, transmission electron microscopy, uniaxial tensile test and corrosion test with immersion and dynamic Potentiometric tests. The alloys showed an in-situ composite microstructure consisting of α-Mg and icosahedral phase (I-phase) as a strengthening phase. As the volume fraction of the I-phase increases, the yield and tensile strengths of the alloys increase while maintaining large elongation (26-30%), indicating that I-phase is effective for strengthening and forms a stable interface with surrounding a-Mg matrix. The presence of I-phase having higher corrosion potential than α-Mg, decreased the corrosion rate of the cast alloy up to I-phase volume fraction of 3.7%. However further increase in the volume fraction of the I-phase deteriorates the corrosion resistance due to enhanced internal galvanic corrosion cell between α-Mg and I-phase.

Original languageEnglish
Pages (from-to)145-152
Number of pages8
JournalJournal of Korean Institute of Metals and Materials
Volume49
Issue number2
DOIs
Publication statusPublished - 2011 Feb 1

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Modelling and Simulation
  • Surfaces, Coatings and Films
  • Metals and Alloys

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