Ultrafine grained Au-Co alloys were prepared by high pressure torsion (HPT) technique. The severe plastic deformation was carried out at room and cryogenic temperatures. A consolidated alloy is formed from the initial powder mixture of metals in an equiatom ratio after mechanical alloying. Then, synchrotron radiation diffractometry of the obtained samples was carried out. It was found that after deformation at room temperature an fcc substitutional supersaturated solid solution formed. Changing the deformation temperature to cryogenic leads to greater dissolution of Co. This result corresponds to the increased mechanical and physical properties of the Au-Co alloys after cryo-HPT processing than after room one.
Diffraction experiments were performed at the SR beamline №4 of the VEPP-3 storage ring.
The research was carried out within the state assignment of Ministry of Science and Higher Education of the Russian Federation (theme “Рressure” No. АААА-А18-118020190104-3), supported in part by RFBR (project No. 19-32-60039).