THE RECOVERY OF THE ULTRASONIC ATTENUATION IN-COPPER: SINGLE CRYSTALS FOLLOWING SMALL PLASTIC DEFORMATION

摘要

Copper single crystals of 99.9% purity were deformed about .5% in tension at temperatures in the range 332.5 to 368° K. The ultrasonic attenuation was measured continuously after deformation at a frequency of about 17 Mc. During the measurement the specimen was in the load-off condition and at the deformation temperature. It is found by use of the Crenate, Hecate and Lucked recovery theory, that the Cottrell-Bilgy strain aging law is obeyed in the recovery of the ultrasonic attenuation. In most cases the use of an incubation time is required which differentiates between the time the deformation stopped and the time at which the t2/3 law seems to take effect.