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http://dx.doi.org/10.3365/KJMM.2011.49.2.145

Mechanical Property and Corrosion Resistance of Mg-Zn-Y Alloys Containing Icosahedral Phase  

Kim, Do Hyung (82nd AMD, AFLC, ROKAF)
Kim, Young Kyun (Center for Non-Crystalline Materials, Yonsei University)
Kim, Won Tae (IT Division, Cheongju University)
Kim, Do Hyang (Center for Non-Crystalline Materials, Yonsei University)
Publication Information
Korean Journal of Metals and Materials / v.49, no.2, 2011 , pp. 145-152 More about this Journal
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
quasicrystals; casting; corrosion; tensile test; transmission electron microscopy (TEM);
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