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The interaction between edge basal dislocations and$\beta$-Mg$_{17}$Al$_{12}$ precipitates was studied using atomisticsimulations. A strategy was developed to insert a lozenge-shapedMg$_{17}$Al$_{12}$ precipitate with Burgers orientation relationship within theMg matrix in an atomistic model ensuring that the matrix/precipitate interfaceswere close to minimum energy configurations. It was found that the dislocationbypassed the precipitate by the formation of an Orowan loop, that entered theprecipitate. Within the precipitate, the dislocation was not able to progressfurther until more dislocations overcome the precipitate and push the initialloop to shear the precipitate along the (110) plane, parallel to the basalplane of Mg. This process was eventually repeated as more dislocations overcomethe precipitate and this mechanism of dislocation/precipitate interaction wasin agreement with experimental observations. Moreover, the initial resolvedshear stress to bypass the precipitate was in agreement with the predictions ofthe Bacon-Kocks-Scattergood model.

Basal dislocation/precipitate interactions in Mg-Al alloys: an atomistic investigation