Fig. 3: Dissociation of a \(1/2[1\bar{1}0]\) edge dislocation in NiCo random alloys.

The equilibrium positions of the dissociated dislocation after energy minimization are shown in (a) Co₇₀Ni₃₀ (positive average SFE), (b) Co₈₅Ni₁₅ (zero average SFE), and (c) Co₉₀Ni₁₀ (negative average SFE); (d–f) show the dissociated edge dislocation at T = 78 K; (g, h) show the corresponding dislocations at T = 850 K. The dislocation analysis from OVITO is used, where the black lines represent the two partial dislocations (b₁, b₂ are \(\frac{a}{6}<112> \)-type dislocations). Regardless of the sign of the average stacking fault energy values, the dissociation width of the edge dislocation remains finite at low temperature. i–k tracks the evolution of the average separation distance as a function of time, showing a continuous dissociation in Co₉₀Ni₁₀ alloy at T = 850 K.