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Vol.49, No.2, 145 ~ 153, 2011
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| Title |
| Mechanical Property and Corrosion Resistance of Mg-Zn-Y Alloys Containing Icosahedral Phase |
| 김도형 Do Hyung Kim , 김원태 Won Tae Kim , 김도향 Do Hyang Kim , 김영균 Young Kyun Kim |
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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 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 α-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. |
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| Key Words |
| quasicrystals, casting, corrosion, tensile test, transmission electron microscopy, TEM |
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