Microstructures and mechanical properties of the Mg–7Y–4Gd–xZn–0.4Zr (x = 0.5, 1.5, 3, and 5 wt.%) alloys in the as-cast, as-extruded, and peak-aged conditions have been investigated by using optical microscopy, scanning electron microscope, X-ray diffraction, and transmission electron microscopy. It is found that the peak-aged Mg–7Y–4Gd–1.5Zn–0.4Zr alloys have the highest strength after aging at 220 °C. The highest ultimate tensile strength and yield tensile strength are 418 and 320 MPa, respectively. The addition of 1.5 wt.% Zn to the based alloys results in a greater aging effect and better mechanical properties at both room and elevated temperatures. The improved mechanical properties are mainly ascribed to both a fine β′ phase and a long periodic stacking-ordered structure, which coexist together in the peak-aged alloys.
Magnesium Alloy Ultimate Tensile Strength Peak Hardness Energy Dispersive Spectroscopy Result Equilibrium Solid Solubility
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This project was supported by Hi-Tech Research and Development Program of China (2006AA03Z520), Chinese Academy of Sciences and Jilin Province, and Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Moscow.
Kojima Y, Aizawa T, Kamado S, Higashi K (2003) Mater Sci Forum 3:419Google Scholar