In this paper the effect of grain size and gadolinium content on mechanical properties was studied. The Mg-Gd binary alloy with broad range of Gd concentrations (0.4 to 4.2 wt.%) and grain size (15 to 500 μm) were used. Concurrent measurement of acoustic emission was used to better understand deformation mechanisms. The Hall-Petch parameters for Mg15Gd alloy were measured. Significant differences between the alloys were observed. The twin growth is most pronounced in Mg04Gd alloy, Mg15Gd exhibits generally lower twinning activity and Mg42Gd alloy exhibits limited twin growth and nucleation of many thin twins.Keywords: Magnesium, acoustic emission, mechanical testing, twinning
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