An example supporting the importance of dislocation core structure: An explanation of the relative yield stresses of « 110] and « 011] slips in gamma-TiAl

Abstract

In gamma-TiAl, the critical resolved shear stress (CRSS) for <110]slip is larger than the CRSS for <011] slip, by a factor of approximately two. This letter gives a simple explanation for this numerical relationship, by making use of the properties in the dissociation structures of 1<110] ordinary dislocations and 2 <011] superlattice dislocations.