Void implementation

Voids are implemented in DADOS as spherical-shaped structures of immobile vacancies.

Emission

Voids emit vacancies by taking one from the edge and releasing as a point defect it at any point randomly chosen in the edge. The emission rate is:

Where:

• λ is the jump distance.

• D0ClusterProp is proportional to the prefactor.
• MINVoidsSIZE is the minimum size of a vacancies cluster to be converted into a void.
• n is the cluster size.
• Eb is the binding energy.
• Em is the migration energy of the released point defect.
• See symbol list.

Growth

When a mobile vacancy is near enough the void (closer than the capture distance), it is captured by it and is inserted into the edge of the structure.

Shrinkage

When a mobile interstitial is near enough the void, it is captured by it and it is recombined with a vacancy. When only one particle is remaining, the void is transformed into a point defect.