Abstract
The phase field dislocation model has been used to compute and simulate interactions between basal α-type dislocations and coherent β1 precipitate plates in a Mg-3wt.%Nd alloy that is strengthened exclusively by the β1 plates. The computed increments of the critical resolved shear stress (ΔCRSS) for samples aged for 10 hours at 523 K agree well with those calculated from the existing strengthening equation for plate-shaped particles. The phase field simulations further indicate that the ΔCRSS value increases with an increase in plate aspect ratio and number density, and that the change of ΔCRSS is not sensitive to the variation of β1 plate diameter distribution when the average diameter of β1 plates is fixed. When the volume fraction of β1 plates is constant, the ΔCRSS value for a random spatial distribution of the β1 plates is approximately 0.78 times of that for a regular spatial distribution.
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