On the structural features of mechanically alloyed Cu-Ag and Au-Co by severe cold and cryogenic plastic deformation
- Mr. Timofey TOLMACHEV
- Mr. Timofey TOLMACHEV (M.N. Mikheev Institute of Metal Physics of the Ural Branch of the Russian Academy of Sciences (IMP UB RAS))
- Dr. Vitaliy PILYUGIN (M.N. Mikheev Institute of Metal Physics of the Ural Branch of the Russian Academy of Sciences (IMP UB RAS))
- Mr. Alexey ANCHAROV (Institute of Solid State Chemistry and Mechanochemistry SB RAS)
- Dr. Alexander PATSELOV (M.N. Miheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences)
- Mr. Evgeniy CHERNYSHEV (M.N. Mikheev Institute of Metal Physics of the Ural Branch of the Russian Academy of Sciences)
Systems of positive enthalpy of mixing Cu-Ag and Au-Co in a condition of powder mixtures were processed by high pressure torsion at 293 K (cold deformation) and 80 K (cryodeformation). Original concentration of the elements for Cu-Ag was 80:20 at.% respectively and for Au-Co were 80:20 and 50:50 at.% respectively. The samples were studied by an X-ray diffraction analysis by synchrotron radiation at a wavelength of 0.03685 nm. It was found that the substitution solid solutions on the base of Cu for Cu-Ag and on the base of Au for Au-Co are formed. Besides that another phases as a result of decay or incomplete dissolution was also recorded. It was revealed that for Cu-Ag the cryogenic temperature effect during strain at constant pressure doesn't contribute to increase the content of Ag in solid solution. But for Au-Co this effect is reversal. More than that each of the following factors promote to increase the Co content in solid solution: increasing of pressure, reducing the temperature to cryogenic one, increasing of the applied strain and, of course, increasing of Co content in original mixing.