Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Mechanical Property and Corrosion Resistance of Mg-Zn-Y Alloys Containing Icosahedral Phase

준결정상을 포함한 Mg-Zn-Y 합금의 기계적 특성 및 부식 저항성

  • 김도형 (공군 군수사령부, 제82항공정비창) ;
  • 김영균 (연세대학교, 준결정재료연구단) ;
  • 김원태 (청주대학교, 산업.레이저광정보공학부) ;
  • 김도향 (연세대학교, 준결정재료연구단)
  • Received : 2010.08.26
  • Published : 2011.02.25
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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 ${\alpha}$-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 ${\alpha}$-Mg matrix. The presence of I-phase having higher corrosion potential than ${\alpha}$-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 ${\alpha}$-Mg and I-phase.

Keywords

Acknowledgement

Supported by : 지식경제부

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