Calculations of Lengths of Dislocation Combinations in FCC Crystals

In the present work, lengths of dislocation combinations formed as a result of interaction of reacting dislocations in noncoplanar glide systems are calculated. A new model is suggested in which the geometry of dislocation combination is considered for an arbitrary asymmetrical intersection of dislocation segments. The lengths of dislocation combinations are determined on the example of one dislocation reaction. The statistics of an arbitrary intersection of the reacting dislocations are considered for an arbitrary (from screw to edge) orientation of a glissile dislocation.     

Resistance to expansion of dislocation loop in fcc metal

In the paper we calculate the strength of dislocation compounds in fcc metals for dislocations of different orientation relative to the Burgers vector. A study is made of the dependence of the coefficient _r, which characterizes the contribution of the reactive component of a dislocation forest to the flow stress, and the probability _r of formation of dislocation compounds on the angle II of orientation of glissile dislocations.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 8, pp. 35–38, August, 1982.     

Application of SR XFA data to statistical studies of stable geochemical associations of the Asachinsky Au-Ag deposit (Southern Kamchatka)

The features of stable geochemical associations of the Asachinsky epithermal Au-Ag deposit are studied using statistical methods for analyzing the data of synchrotron radiation induced X-ray fluorescence analysis (SR XFA). Correlation, cluster, and factor analyses are used as basic methods for estimating the correlation between concentrations of elements, detecting stable geochemical associations, and selecting polyelement geochemical indicators. The use of the SR XFA data in combination with mathematical methods makes it possible to determine the causalities between various geochemical indicators, to reconstruct the shape of the geological object under study in the factor coordinate space, and to determine its distinctive features.     

Formation of extended compound dislocations and barriers in the course of interdislocation reactions in FCC crystals

The behavior of compound dislocations under stress loading is considered. Dislocation configurations are onsidered for an arbitrary asymmetric intersection of reacting dislocation segments. It is demonstrated that depending on the character of dislocation segment intersection, compound dislocations of two types can be formed, one of which is destructed under increasing stress loading. In the other case, the length of the compound dislocation increases, thereby causing the formation of long extended barriers. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 3, pp. 25–30, March, 2009.