XX. Some Ordering Effects inCu₃Auat about100°c

Summary Using the electrical resistance as an indicator for ordering it is found that Cu3Au specimens prepared in a state of long-range order and then water quenched from 380°c (8°c below the critical temperature) show an ordering effect at about 100°c. After this has decayed a similar effect is again observed after an electron bombardment (energies of 0·5 and 1 mev) or after a small deformation at room temperature. An activation energy E∼0·9 ev for all three cases is determined. Attributing the ordering effect to the migration of vacancies or interstitials the experiments provide evidence that one of both of these defects are obtained in thermodynamic excess by quenching or deforming.