Microstructure and Mechanical Properties of Extruded Mg-Zn-Gd-Based Alloy Reinforced by Quasicrystals and Laves Phase

Abstract:

The microstructure and mechanical properties of Mg95.9Zn3.5Gd0.6 and Mg94.4Zn3.5Gd0.6Cu1.5 alloys reinforced by icosahedral quasicrystalline phase (I-phase) and Laves phase has been studied after extrusion at 573K. Extrusion can significantly refined the I-phase and Laves phase, and the strengthening effect of I-phase and Laves phase has been analyzed. Large volume of icosahedral phase in Mg95.9Zn3.5Gd0.6 has important role in its high UTS and elongation due to strong bonding effect at the I-phase/matrix interface for low interface energy. The Laves phase with cubic topological and close-packed structure in Mg94.4Zn3.5Gd0.6Cu1.5 alloy result in the higher heat resistance at elevated temperatures.

• Periodical: Materials Science Forum (Volumes 546-549)
• Pages: 323-326
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.546-549.323
• Online since: May 2007
• Authors: Yong Liu, Guang Yin Yuan, Chen Lu, Wen Jiang Ding
• Keywords: Laves Phases, Magnesium Alloy, Mg-Zn-Gd, Quasicrystal

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