Mg-18Zn-3Y alloy containing an icosahedral quasicrystal phase (I-phase) was prepared using the ordinary solidification method. After solid solution treatment at 320 and 420 °C, indentation creep tests were conducted for the Mg matrix and the I-phase in different solid solution states in Mg-18Zn-3Y alloy using the indentation technique with a Berkovich indenter. The quasicrystalline phases with stripy and skeletal structures were identified through the microscopic observation and energy spectrum analysis. The results indicate that the elastic modulus, microhardness, and creep stress index of the I-phase in the alloy initially increase and then decrease with increasing solution temperature. The elastic modulus and microhardness of the α-Mg alloy are the highest in the as-cast state, and the creep stress index increases with increasing solution temperature. This study provides a practical basis for microstructure measurement of quasicrystalline creep.
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