Yttrium (Y) addition is known to be effective in enhancing the formability of magnesium (Mg) alloys by reducing the plasticity anisotropy of the hexagonal crystal, viz. improving the ease of dislocation slip in relation to the dislocation slip. In this work, in-situ TEM compression test has been carried out to observe the nucleation and movement of dislocations in two Mg-Y binary alloys with different Y contents (0.4 wt.%Y versus 4 wt.%Y). The results have shown (Figure 1) that in the Mg-0.4Y alloy, the edge segments of dislocations are sessile. The increased Y content in the Mg-4Y alloy has shown (Figure 2) to increase the dislocation mobility and the cross-slip propensity. The results will be discussed with computer simulation results published.
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