Keyword: «dislocations»

Changes in crystal structure of metal at action of variable tension are considered. The description of the mechanism of formation of dislocations is given. On the basis of the dislocation theory process of emergence and development of cracks of fatigue is described. The main processes which are the cornerstone of fatigue failure are listed and grouped.

To improve and develop new technologies for the extraction of fine gold, it is necessary to find out the form of the location and chemical state of gold in concentrator minerals. For the first time, complex chemical and ion-plasma etching of a sulfide matrix in an oxygen and argon medium was used to open nanoscale gold. As a result of chemical etching, loose iron chloride salts and other unstable compounds are formed on the surface of sulfides, which are partially removed by ultrasonic cleaning. Ion-plasma etching in an oxygen and argon medium removes the products of the chemical reaction and conducts a finer etching of sulfides. It is shown that noble metals with their high electrical conductivity ionization caused by irradiation with charged particles is very quickly neutralized by conduction electrons, and this process does not lead to any noticeable changes in their electrophysical properties, providing selective etching of the sulfide matrix. A study of the morphology and localization of nanozolot in sulfides by scanning tunneling, atomic force microscopy was carried out. It is established that nanoscale gold inclusions are distributed throughout the volume of the host sulfides in a native form. The deformation structures of the enclosing sulfides and their relationship with gold emissions are investigated.