Asymmetric slip in Mo single crystals

This is the authors' abstract. We don't add key points for this paper.

The tensile properties of Mo single crystals in six different orientations were investigated over the range from 20 to 550 °K. The plastic behavior shows asymmetry in the critical resolved shear stress for slip on both {110} and {112} planes. At low temperatures, within the thermally activated region, slip takes place on well-defined crystallographic planes. At high temperatures in this range, however, slip takes place on irrational planes. The asymmetries associated with the yield stress and slip decrease with increasing temperature. An attempt was made to rationalize these asymmetric behaviors in terms of the modified Peierls model. This model assumes the asymmetric slip arises from a tendency toward asymmetric arrangement of atoms in the core of the a/2 〈111〉 screw dislocations. It is shown that the model is in qualitative agreement with the observed experiment of trends.