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Sheggaf, Zayad M.
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article
Effect of yttrium addition on microstructure and hardness of cast ZRE1 magnesium alloy
Abstract
In this research, optical observations, X- ray diffraction and hardness measurements were used to investigate the effects of yttrium (Y) additions on as cast ZRE1 magnesium alloy. 0.75 wt.% Y was added and compared with the base alloy. The microstructure results show the refinement of the grain by the addition of Y and the grains became smaller about 32 %, which led to the increment of hardness from 50 HV (as-cast ZRE1) to 56.6 HV (as-cast ZRE1+0.75 Y).Energy dispersive spectroscopy (EDS) results showed that the base alloy mainly contained a-Mg matrix and Mg-Zn-Ce as a second phase crystallized along the grain boundaries and with the addition of Y, Mg-Zn-Y-Ce phase was found as a new second phase, where Y combined with the original second phase, which confirmed by the X-ray diffraction (XRD) results and also there is no other phases was formed by the Y addition.<br/><br/>