Criterion of ductile-brittle transition under conditions of dislocation cluster interaction with source

Ductile-brittle transition criterion taking account of interconnection between parameters of dislocation multiplication processes and slipping transition processes in a polycrystal, is obtained as a result of analysis of interdislocational interaction in a dislocation set, comprising plane clusters of various signs and a source, generating them. Activation energy value for dislocation movement in the Peierls relief, calculated using the criterion obtained according to experimental values of cold brittleness temperature for tungsten, agrees well with the values obtained by other methods