On the one hand, as the atomic size of Y/Er is much larger than that of Mg and Li (more than 10% in diameter), the Y/Er in an Mg-Li alloy would have a strong trend toward segregation to GBs or any other defect sites to weaken the size misfit energy in the matrix.
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The Effect of Y/Er and Zn Addition on the Microstructure and Mechanical Properties of Mg-11Li Alloy.
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