| Title |
Mechanical Property and Corrosion Resistance of Mg-Zn-Y Alloys Containing Icosahedral Phase |
| Authors |
김도형(Do Hyung Kim); 김원태(Won Tae Kim); 김도향(Do Hyang Kim); 김영균(Young Kyun Kim) |
| DOI |
https://doi.org/10.3365/KJMM.2011.49.2.145 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
quasicrystals; casting; corrosion; tensile test; transmission electron microscopy; TEM |
| 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. |