The energy of coherent twin boundaries of some metals and alloys

Using the method of thermal etching the measurements were carried out of the relative values of coherent twin boundary free energy y T and surface free energy y s for silver, copper, nickel, gamma-iron, cobalt, two copper-aluminium alloys, eight nickel-cobalt alloys and one iron—nickel alloy. By means of data on y s found in the literature free energies of coherent twin boundaries were calculated for silver, copper, nickel, gamma-iron and iron-35 at. % nickel alloy.