《Table 3 EDS results of the as-extruded alloys》

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《Effects of Y Content on the Microstructures and Mechanical Properties of Mg-5Zn-xY-0.6Zr Alloys》

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The X-ray diffraction patterns of as-extruded Mg-5Zn-x Y-0.6Zr alloys are shown in Fig.5.SEM micrographs and corresponding EDS microanalysis of the alloys are presented in Fig.6，respectively.It suggests that the phase composition of WZ505and WZ805 alloys are mainlyα-Mg solid solution，W-Mg3Y2Zn3 and X-Mg12YZn phases.However，the distribution of W-phase is more obvious around the stripped phases than in matrix.Moreover，the diffraction peaks intensity of W-Mg3Y2Zn3 phase is especially weak.The result illustrates that volume fraction of W-phases is little in WZ805 alloy.There are onlyα-Mg and X-Mg12YZn phase shown in Fig.5（c），it proves W-Mg3Y2Zn3 phase doesn’t exist in WZ1105alloy.Results suggest that phase compositions have no obvious changes after indirect extrusion，but the phase morphology changes a lot in the process.It could be confirmed by the EDS analysis that position B in Fig.6（a）shown in Table 3 illustrates the atomic ratio between Y and Zn is nearly 2:3 in both large and small particles.This is corresponding to the XRD results of W-Mg3Y2Zn3 phase shown in Fig.4.The EDS result of position C indicates that the atomic ratio of Y and Zn is approximately 1:1，it reveales the stripped fiber-like phase refers to X-Mg12YZn in Fig.6（c）.